Merge commit '98ed962c7d' into master

compiler/rustc_codegen_gcc/.github/workflows/ci.yml

@@ -49,11 +49,11 @@ jobs:
       # `llvm-14-tools` is needed to install the `FileCheck` binary which is used for asm tests.
       run: sudo apt-get install ninja-build ripgrep llvm-14-tools
 
-    - name: Install rustfmt
+    - name: Install rustfmt & clippy
-      run: rustup component add rustfmt
+      run: rustup component add rustfmt clippy
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
 
     - name: Setup path to libgccjit
       run: |
@@ -78,8 +78,15 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build
+        ./y.sh build --sysroot
         cargo test
+
+    - name: Run y.sh cargo build
+      run: |
+        ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
+
+    - name: Clean
+      run: |
         ./y.sh clean all      
 
     - name: Prepare dependencies
@@ -96,7 +103,12 @@ jobs:
         ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }}
 
     - name: Check formatting
-      run: cargo fmt -- --check
+      run: ./y.sh fmt --check
+
+    - name: clippy
+      run: |
+        cargo clippy --all-targets -- -D warnings
+        cargo clippy --all-targets --features master -- -D warnings
 
   duplicates:
     runs-on: ubuntu-latest

compiler/rustc_codegen_gcc/.github/workflows/failures.yml

@@ -56,7 +56,7 @@ jobs:
 
     - name: Download artifact
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
@@ -94,7 +94,20 @@ jobs:
       run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
       id: tests
       run: |
         ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --clean --build-sysroot --test-failing-rustc ${{ matrix.libgccjit_version.extra }} | tee output_log
         rg --text "test result" output_log >> $GITHUB_STEP_SUMMARY
+
+    - name: Run failing ui pattern tests for ICE
+      # TODO: re-enable those tests for libgccjit 12.
+      if: matrix.libgccjit_version.gcc != 'libgccjit12.so'
+      id: ui-tests
+      run: |
+        ${{ matrix.libgccjit_version.env_extra }} ./y.sh test --release --test-failing-ui-pattern-tests ${{ matrix.libgccjit_version.extra }} | tee output_log_ui
+        if grep -q "the compiler unexpectedly panicked" output_log_ui; then
+          echo "Error: 'the compiler unexpectedly panicked' found in output logs. CI Error!!"
+          exit 1
+        fi

compiler/rustc_codegen_gcc/.github/workflows/gcc12.yml

@@ -68,21 +68,23 @@ jobs:
       run: |
         ./y.sh prepare --only-libcore --libgccjit12-patches
         ./y.sh build --no-default-features --sysroot-panic-abort
-        cargo test --no-default-features
+        # Uncomment when we no longer need to remove global variables.
-        ./y.sh clean all
+        #./y.sh build --sysroot --no-default-features --sysroot-panic-abort
+        #cargo test --no-default-features
+        #./y.sh clean all
 
-    - name: Prepare dependencies
+    #- name: Prepare dependencies
-      run: |
+      #run: |
-        git config --global user.email "user@example.com"
+        #git config --global user.email "user@example.com"
-        git config --global user.name "User"
+        #git config --global user.name "User"
-        ./y.sh prepare --libgccjit12-patches
+        #./y.sh prepare --libgccjit12-patches
 
-    - name: Add more failing tests for GCC 12
+    #- name: Add more failing tests for GCC 12
-      run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
+      #run: cat tests/failing-ui-tests12.txt >> tests/failing-ui-tests.txt
 
-    - name: Add more failing tests because the sysroot is not compiled with LTO
+    #- name: Add more failing tests because the sysroot is not compiled with LTO
-      run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
+      #run: cat tests/failing-non-lto-tests.txt >> tests/failing-ui-tests.txt
 
-    - name: Run tests
+    #- name: Run tests
-      run: |
+      #run: |
-        ./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features
+        #./y.sh test --release --clean --build-sysroot ${{ matrix.commands }} --no-default-features

compiler/rustc_codegen_gcc/.github/workflows/m68k.yml

@@ -54,13 +54,7 @@ jobs:
       run: curl -LO https://github.com/cross-cg-gcc-tools/cross-gcc/releases/latest/download/gcc-m68k-13.deb
 
     - name: Download VM artifact
-      uses: dawidd6/action-download-artifact@v2
+      run: curl -LO https://github.com/cross-cg-gcc-tools/vms/releases/latest/download/debian-m68k.img
-      with:
-          workflow: m68k.yml
-          name: debian-m68k
-          repo: cross-cg-gcc-tools/vms
-          branch: master
-          event: push
 
     - name: Setup path to libgccjit
       run: |
@@ -88,10 +82,17 @@ jobs:
         sudo mount debian-m68k.img vm
         sudo cp $(which qemu-m68k-static) vm/usr/bin/
 
+    - name: Build sample project with target defined as JSON spec
+      run: |
+        ./y.sh prepare --only-libcore --cross
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh cargo build --manifest-path=./tests/hello-world/Cargo.toml --target ${{ github.workspace }}/target_specs/m68k-unknown-linux-gnu.json
+        ./y.sh clean all
+
     - name: Build
       run: |
         ./y.sh prepare --only-libcore --cross
-        ./y.sh build --target-triple m68k-unknown-linux-gnu
+        ./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu
         CG_GCC_TEST_TARGET=m68k-unknown-linux-gnu cargo test
         ./y.sh clean all
 

compiler/rustc_codegen_gcc/.github/workflows/release.yml

@@ -37,7 +37,7 @@ jobs:
       run: sudo apt-get install ninja-build ripgrep
 
     - name: Download artifact
-      run: curl -LO https://github.com/antoyo/gcc/releases/latest/download/gcc-13.deb
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/gcc-13.deb
 
     - name: Setup path to libgccjit
       run: |
@@ -53,7 +53,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        EMBED_LTO_BITCODE=1 ./y.sh build --release --release-sysroot
+        EMBED_LTO_BITCODE=1 ./y.sh build --sysroot --release --release-sysroot
         cargo test
         ./y.sh clean all
 
@@ -62,12 +62,12 @@ jobs:
         git config --global user.email "user@example.com"
         git config --global user.name "User"
         ./y.sh prepare
-        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
-        echo -n 'lto = "fat"' >> build_sysroot/Cargo.toml
 
     - name: Add more failing tests because of undefined symbol errors (FIXME)
       run: cat tests/failing-lto-tests.txt >> tests/failing-ui-tests.txt
 
     - name: Run tests
       run: |
+        # FIXME(antoyo): we cannot enable LTO for stdarch tests currently because of some failing LTO tests using proc-macros.
+        echo -n 'lto = "fat"' >> build_system/build_sysroot/Cargo.toml
         EMBED_LTO_BITCODE=1 ./y.sh test --release --clean --release-sysroot --build-sysroot ${{ matrix.commands }}

compiler/rustc_codegen_gcc/.github/workflows/stdarch.yml

@@ -58,7 +58,7 @@ jobs:
     - name: Build
       run: |
         ./y.sh prepare --only-libcore
-        ./y.sh build --release --release-sysroot
+        ./y.sh build --sysroot --release --release-sysroot
 
     - name: Set env (part 2)
       run: |
@@ -89,12 +89,11 @@ jobs:
     - name: Run stdarch tests
       if: ${{ !matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
+        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml
-        CHANNEL=release TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test
 
     - name: Run stdarch tests
       if: ${{ matrix.cargo_runner }}
       run: |
-        cd build_sysroot/sysroot_src/library/stdarch/
         # FIXME: these tests fail when the sysroot is compiled with LTO because of a missing symbol in proc-macro.
-        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ../../../../y.sh cargo test -- --skip rtm --skip tbm --skip sse4a
+        # TODO: remove --skip test_mm512_stream_ps when stdarch is updated in rustc.
+        STDARCH_TEST_EVERYTHING=1 CHANNEL=release CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_RUNNER="${{ matrix.cargo_runner }}" TARGET=x86_64-unknown-linux-gnu CG_RUSTFLAGS="-Ainternal_features" ./y.sh cargo test --manifest-path build/build_sysroot/sysroot_src/library/stdarch/Cargo.toml -- --skip rtm --skip tbm --skip sse4a --skip test_mm512_stream_ps

compiler/rustc_codegen_gcc/.gitignore

@@ -6,10 +6,6 @@ perf.data
 perf.data.old
 *.events
 *.string*
-/build_sysroot/sysroot
-/build_sysroot/sysroot_src
-/build_sysroot/Cargo.lock
-/build_sysroot/test_target/Cargo.lock
 gimple*
 *asm
 res

compiler/rustc_codegen_gcc/Cargo.lock

@@ -80,8 +80,7 @@ dependencies = [
 [[package]]
 name = "gccjit"
 version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/rust-lang/gccjit.rs#328cb1b414f67dfa15162ba7a55ed01931f1b219"
-checksum = "ecaa4c3da2d74c1a991b4faff75d49ab1d0522d9a99d8e2614b3b04d226417ce"
 dependencies = [
  "gccjit_sys",
 ]
@@ -89,8 +88,7 @@ dependencies = [
 [[package]]
 name = "gccjit_sys"
 version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+source = "git+https://github.com/rust-lang/gccjit.rs#328cb1b414f67dfa15162ba7a55ed01931f1b219"
-checksum = "406a66fba005f1a02661f2f9443e5693dd3a667b7c58e70aa4ccc4c8b50b4758"
 dependencies = [
  "libc",
 ]

compiler/rustc_codegen_gcc/Cargo.toml

@@ -22,7 +22,7 @@ master = ["gccjit/master"]
 default = ["master"]
 
 [dependencies]
-gccjit = "2.0"
+gccjit = "2.1"
 
 # Local copy.
 #gccjit = { path = "../gccjit.rs" }

compiler/rustc_codegen_gcc/Readme.md

@@ -12,6 +12,14 @@ This is a GCC codegen for rustc, which means it can be loaded by the existing ru
 The primary goal of this project is to be able to compile Rust code on platforms unsupported by LLVM.
 A secondary goal is to check if using the gcc backend will provide any run-time speed improvement for the programs compiled using rustc.
 
+### Dependencies
+
+**rustup:** Follow the instructions on the official [website](https://www.rust-lang.org/tools/install)
+
+**DejaGnu:** Consider to install DejaGnu which is necessary for running the libgccjit test suite. [website](https://www.gnu.org/software/dejagnu/#downloading)
+
+
+
 ## Building
 
 **This requires a patched libgccjit in order to work.
@@ -80,7 +88,7 @@ Then you can run commands like this:
 
 ```bash
 $ ./y.sh prepare # download and patch sysroot src and install hyperfine for benchmarking
-$ ./y.sh build --release
+$ ./y.sh build --sysroot --release
 ```
 
 To run the tests:
@@ -91,10 +99,16 @@ $ ./y.sh test --release
 
 ## Usage
 
-`$CG_GCCJIT_DIR` is the directory you cloned this repo into in the following instructions:
+You have to run these commands, in the corresponding order:
 
 ```bash
-export CG_GCCJIT_DIR=[the full path to rustc_codegen_gcc]
+$ ./y.sh prepare
+$ ./y.sh build --sysroot
+```
+To check if all is  working correctly, run:
+
+ ```bash
+$ ./y.sh cargo build --manifest-path tests/hello-world/Cargo.toml
 ```
 
 ### Cargo
@@ -107,8 +121,7 @@ If you compiled cg_gccjit in debug mode (aka you didn't pass `--release` to `./y
 
 ### LTO
 
-To use LTO, you need to set the variable `FAT_LTO=1` and `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
+To use LTO, you need to set the variable `EMBED_LTO_BITCODE=1` in addition to setting `lto = "fat"` in the `Cargo.toml`.
-Don't set `FAT_LTO` when compiling the sysroot, though: only set `EMBED_LTO_BITCODE=1`.
 
 Failing to set `EMBED_LTO_BITCODE` will give you the following error:
 
@@ -118,7 +131,13 @@ error: failed to copy bitcode to object file: No such file or directory (os erro
 
 ### Rustc
 
-> You should prefer using the Cargo method.
+If you want to run `rustc` directly, you can do so with:
+
+```bash
+$ ./y.sh rustc my_crate.rs
+```
+
+You can do the same manually (although we don't recommend it):
 
 ```bash
 $ LIBRARY_PATH="[gcc-path value]" LD_LIBRARY_PATH="[gcc-path value]" rustc +$(cat $CG_GCCJIT_DIR/rust-toolchain | grep 'channel' | cut -d '=' -f 2 | sed 's/"//g' | sed 's/ //g') -Cpanic=abort -Zcodegen-backend=$CG_GCCJIT_DIR/target/release/librustc_codegen_gcc.so --sysroot $CG_GCCJIT_DIR/build_sysroot/sysroot my_crate.rs
@@ -126,18 +145,19 @@ $ LIBRARY_PATH="[gcc-path value]" LD_LIBRARY_PATH="[gcc-path value]" rustc +$(ca
 
 ## Env vars
 
-<dl>
+ * _**CG_GCCJIT_DUMP_ALL_MODULES**_: Enables dumping of all compilation modules. When set to "1", a dump is created for each module during compilation and stored in `/tmp/reproducers/`.
-    <dt>CG_GCCJIT_INCR_CACHE_DISABLED</dt>
+ * _**CG_GCCJIT_DUMP_MODULE**_: Enables dumping of a specific module. When set with the module name, e.g., `CG_GCCJIT_DUMP_MODULE=module_name`, a dump of that specific module is created in `/tmp/reproducers/`.
-    <dd>Don't cache object files in the incremental cache. Useful during development of cg_gccjit
+ * _**CG_RUSTFLAGS**_: Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.
-    to make it possible to use incremental mode for all analyses performed by rustc without caching
+ * _**CG_GCCJIT_DUMP_TO_FILE**_: Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.
-    object files when their content should have been changed by a change to cg_gccjit.</dd>
+ * _**CG_GCCJIT_DUMP_RTL**_: Dumps RTL (Register Transfer Language) for virtual registers.
-    <dt>CG_GCCJIT_DISPLAY_CG_TIME</dt>
+ * _**CG_GCCJIT_DUMP_RTL_ALL**_: Dumps all RTL passes.
-    <dd>Display the time it took to perform codegen for a crate</dd>
+ * _**CG_GCCJIT_DUMP_TREE_ALL**_: Dumps all tree (GIMPLE) passes.
-    <dt>CG_RUSTFLAGS</dt>
+ * _**CG_GCCJIT_DUMP_IPA_ALL**_: Dumps all Interprocedural Analysis (IPA) passes.
-    <dd>Send additional flags to rustc. Can be used to build the sysroot without unwinding by setting `CG_RUSTFLAGS=-Cpanic=abort`.</dd>
+ * _**CG_GCCJIT_DUMP_CODE**_: Dumps the final generated code.
-    <dt>CG_GCCJIT_DUMP_TO_FILE</dt>
+ * _**CG_GCCJIT_DUMP_GIMPLE**_: Dumps the initial GIMPLE representation.
-    <dd>Dump a C-like representation to /tmp/gccjit_dumps and enable debug info in order to debug this C-like representation.</dd>
+ * _**CG_GCCJIT_DUMP_EVERYTHING**_: Enables dumping of all intermediate representations and passes.
-</dl>
+ * _**CG_GCCJIT_KEEP_INTERMEDIATES**_: Keeps intermediate files generated during the compilation process.
+ * _**CG_GCCJIT_VERBOSE**_: Enables verbose output from the GCC driver.
 
 ## Extra documentation
 

compiler/rustc_codegen_gcc/build.rs

@@ -1,6 +0,0 @@
-// TODO: remove this file and deps/libLLVM-18-rust-1.78.0-nightly.so when
-// https://github.com/rust-lang/rust/pull/121967 is merged.
-fn main() {
-    println!("cargo:rerun-if-changed=deps/libLLVM-18-rust-1.78.0-nightly.so");
-    println!("cargo:rustc-link-search=deps");
-}

compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.lock

@@ -0,0 +1,433 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "compiler_builtins",
+ "gimli",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "alloc"
+version = "0.0.0"
+dependencies = [
+ "compiler_builtins",
+ "core",
+]
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c6cb57a04249c6480766f7f7cef5467412af1490f8d1e243141daddada3264f"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "compiler_builtins"
+version = "0.1.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f11973008a8cf741fe6d22f339eba21fd0ca81e2760a769ba8243ed6c21edd7e"
+dependencies = [
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "core"
+version = "0.0.0"
+
+[[package]]
+name = "dlmalloc"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3264b043b8e977326c1ee9e723da2c1f8d09a99df52cacf00b4dbce5ac54414d"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "libc",
+ "rustc-std-workspace-core",
+ "windows-sys",
+]
+
+[[package]]
+name = "fortanix-sgx-abi"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57cafc2274c10fab234f176b25903ce17e690fca7597090d50880e047a0389c5"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "getopts"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14dbbfd5c71d70241ecf9e6f13737f7b5ce823821063188d7e46c41d371eebd5"
+dependencies = [
+ "rustc-std-workspace-core",
+ "rustc-std-workspace-std",
+ "unicode-width",
+]
+
+[[package]]
+name = "gimli"
+version = "0.28.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "hashbrown"
+version = "0.14.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5274423e17b7c9fc20b6e7e208532f9b19825d82dfd615708b70edd83df41f1"
+dependencies = [
+ "allocator-api2",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.153"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c198f91728a82281a64e1f4f9eeb25d82cb32a5de251c6bd1b5154d63a8e7bd"
+dependencies = [
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "miniz_oxide"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d811f3e15f28568be3407c8e7fdb6514c1cda3cb30683f15b6a1a1dc4ea14a7"
+dependencies = [
+ "adler",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "object"
+version = "0.32.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6a622008b6e321afc04970976f62ee297fdbaa6f95318ca343e3eebb9648441"
+dependencies = [
+ "compiler_builtins",
+ "memchr",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "panic_abort"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+]
+
+[[package]]
+name = "panic_unwind"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+ "unwind",
+]
+
+[[package]]
+name = "proc_macro"
+version = "0.0.0"
+dependencies = [
+ "core",
+ "std",
+]
+
+[[package]]
+name = "r-efi"
+version = "4.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c47196f636c4cc0634b73b0405323d177753c2e15e866952c64ea22902567a34"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "r-efi-alloc"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31d6f09fe2b6ad044bc3d2c34ce4979796581afd2f1ebc185837e02421e02fd7"
+dependencies = [
+ "compiler_builtins",
+ "r-efi",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "rustc-std-workspace-alloc"
+version = "1.99.0"
+dependencies = [
+ "alloc",
+]
+
+[[package]]
+name = "rustc-std-workspace-core"
+version = "1.99.0"
+dependencies = [
+ "core",
+]
+
+[[package]]
+name = "rustc-std-workspace-std"
+version = "1.99.0"
+dependencies = [
+ "std",
+]
+
+[[package]]
+name = "std"
+version = "0.0.0"
+dependencies = [
+ "addr2line",
+ "alloc",
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "dlmalloc",
+ "fortanix-sgx-abi",
+ "hashbrown",
+ "hermit-abi",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "panic_abort",
+ "panic_unwind",
+ "r-efi",
+ "r-efi-alloc",
+ "rustc-demangle",
+ "std_detect",
+ "unwind",
+ "wasi",
+]
+
+[[package]]
+name = "std_detect"
+version = "0.1.5"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "sysroot"
+version = "0.0.0"
+dependencies = [
+ "alloc",
+ "compiler_builtins",
+ "core",
+ "proc_macro",
+ "std",
+ "test",
+]
+
+[[package]]
+name = "test"
+version = "0.0.0"
+dependencies = [
+ "core",
+ "getopts",
+ "libc",
+ "panic_abort",
+ "panic_unwind",
+ "std",
+]
+
+[[package]]
+name = "unicode-width"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68f5e5f3158ecfd4b8ff6fe086db7c8467a2dfdac97fe420f2b7c4aa97af66d6"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-core",
+ "rustc-std-workspace-std",
+]
+
+[[package]]
+name = "unwind"
+version = "0.0.0"
+dependencies = [
+ "cfg-if",
+ "compiler_builtins",
+ "core",
+ "libc",
+ "unwinding",
+]
+
+[[package]]
+name = "unwinding"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37a19a21a537f635c16c7576f22d0f2f7d63353c1337ad4ce0d8001c7952a25b"
+dependencies = [
+ "compiler_builtins",
+ "gimli",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+dependencies = [
+ "compiler_builtins",
+ "rustc-std-workspace-alloc",
+ "rustc-std-workspace-core",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"

compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml

@@ -1,12 +1,14 @@
 [package]
-authors = ["bjorn3 <bjorn3@users.noreply.github.com>"]
+authors = ["rustc_codegen_gcc devs"]
 name = "sysroot"
 version = "0.0.0"
 resolver = "2"
 
 [dependencies]
 core = { path = "./sysroot_src/library/core" }
-compiler_builtins = "0.1"
+# TODO: after the sync, revert to using version 0.1.
+# compiler_builtins = "0.1"
+compiler_builtins = "=0.1.109"
 alloc = { path = "./sysroot_src/library/alloc" }
 std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
 test = { path = "./sysroot_src/library/test" }
@@ -18,5 +20,5 @@ rustc-std-workspace-alloc = { path = "./sysroot_src/library/rustc-std-workspace-
 rustc-std-workspace-std = { path = "./sysroot_src/library/rustc-std-workspace-std" }
 
 [profile.release]
-debug = true
+debug = "limited"
 #lto = "fat" # TODO(antoyo): re-enable when the failing LTO tests regarding proc-macros are fixed.

compiler/rustc_codegen_gcc/build_system/src/build.rs

@@ -1,5 +1,7 @@
 use crate::config::{Channel, ConfigInfo};
-use crate::utils::{run_command, run_command_with_output_and_env, walk_dir};
+use crate::utils::{
+    copy_file, create_dir, get_sysroot_dir, run_command, run_command_with_output_and_env, walk_dir,
+};
 use std::collections::HashMap;
 use std::ffi::OsStr;
 use std::fs;
@@ -9,12 +11,14 @@ use std::path::Path;
 struct BuildArg {
     flags: Vec<String>,
     config_info: ConfigInfo,
+    build_sysroot: bool,
 }
 
 impl BuildArg {
+    /// Creates a new `BuildArg` instance by parsing command-line arguments.
     fn new() -> Result<Option<Self>, String> {
         let mut build_arg = Self::default();
-        // We skip binary name and the `build` command.
+        // Skip binary name and the `build` command.
         let mut args = std::env::args().skip(2);
 
         while let Some(arg) = args.next() {
@@ -29,6 +33,9 @@ impl BuildArg {
                         );
                     }
                 }
+                "--sysroot" => {
+                    build_arg.build_sysroot = true;
+                }
                 "--help" => {
                     Self::usage();
                     return Ok(None);
@@ -48,20 +55,20 @@ impl BuildArg {
             r#"
 `build` command help:
 
-    --features [arg]       : Add a new feature [arg]"#
+    --features [arg]       : Add a new feature [arg]
+    --sysroot              : Build with sysroot"#
         );
         ConfigInfo::show_usage();
         println!("    --help                 : Show this help");
     }
 }
 
-pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Result<(), String> {
+fn cleanup_sysroot_previous_build(start_dir: &Path) {
-    let start_dir = Path::new("build_sysroot");
     // Cleanup for previous run
     // Clean target dir except for build scripts and incremental cache
     let _ = walk_dir(
         start_dir.join("target"),
-        |dir: &Path| {
+        &mut |dir: &Path| {
             for top in &["debug", "release"] {
                 let _ = fs::remove_dir_all(dir.join(top).join("build"));
                 let _ = fs::remove_dir_all(dir.join(top).join("deps"));
@@ -70,7 +77,7 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
 
                 let _ = walk_dir(
                     dir.join(top),
-                    |sub_dir: &Path| {
+                    &mut |sub_dir: &Path| {
                         if sub_dir
                             .file_name()
                             .map(|filename| filename.to_str().unwrap().starts_with("libsysroot"))
@@ -80,7 +87,7 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
                         }
                         Ok(())
                     },
-                    |file: &Path| {
+                    &mut |file: &Path| {
                         if file
                             .file_name()
                             .map(|filename| filename.to_str().unwrap().starts_with("libsysroot"))
@@ -90,16 +97,39 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
                         }
                         Ok(())
                     },
+                    false,
                 );
             }
             Ok(())
         },
-        |_| Ok(()),
+        &mut |_| Ok(()),
+        false,
     );
 
     let _ = fs::remove_file(start_dir.join("Cargo.lock"));
     let _ = fs::remove_file(start_dir.join("test_target/Cargo.lock"));
     let _ = fs::remove_dir_all(start_dir.join("sysroot"));
+}
+
+pub fn create_build_sysroot_content(start_dir: &Path) -> Result<(), String> {
+    if !start_dir.is_dir() {
+        create_dir(start_dir)?;
+    }
+    copy_file("build_system/build_sysroot/Cargo.toml", &start_dir.join("Cargo.toml"))?;
+    copy_file("build_system/build_sysroot/Cargo.lock", &start_dir.join("Cargo.lock"))?;
+
+    let src_dir = start_dir.join("src");
+    if !src_dir.is_dir() {
+        create_dir(&src_dir)?;
+    }
+    copy_file("build_system/build_sysroot/lib.rs", &start_dir.join("src/lib.rs"))
+}
+
+pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Result<(), String> {
+    let start_dir = get_sysroot_dir();
+
+    cleanup_sysroot_previous_build(&start_dir);
+    create_build_sysroot_content(&start_dir)?;
 
     // Builds libs
     let mut rustflags = env.get("RUSTFLAGS").cloned().unwrap_or_default();
@@ -110,7 +140,6 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
     if config.no_default_features {
         rustflags.push_str(" -Csymbol-mangling-version=v0");
     }
-    let mut env = env.clone();
 
     let mut args: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"build", &"--target", &config.target];
 
@@ -127,46 +156,33 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
         "debug"
     };
 
+    if let Ok(cg_rustflags) = std::env::var("CG_RUSTFLAGS") {
+        rustflags.push(' ');
+        rustflags.push_str(&cg_rustflags);
+    }
+
+    let mut env = env.clone();
     env.insert("RUSTFLAGS".to_string(), rustflags);
-    run_command_with_output_and_env(&args, Some(start_dir), Some(&env))?;
+    run_command_with_output_and_env(&args, Some(&start_dir), Some(&env))?;
 
     // Copy files to sysroot
     let sysroot_path = start_dir.join(format!("sysroot/lib/rustlib/{}/lib/", config.target_triple));
-    fs::create_dir_all(&sysroot_path).map_err(|error| {
+    create_dir(&sysroot_path)?;
-        format!(
+    let mut copier = |dir_to_copy: &Path| {
-            "Failed to create directory `{}`: {:?}",
-            sysroot_path.display(),
-            error
-        )
-    })?;
-    let copier = |dir_to_copy: &Path| {
         // FIXME: should not use shell command!
         run_command(&[&"cp", &"-r", &dir_to_copy, &sysroot_path], None).map(|_| ())
     };
     walk_dir(
         start_dir.join(&format!("target/{}/{}/deps", config.target_triple, channel)),
-        copier,
+        &mut copier.clone(),
-        copier,
+        &mut copier,
+        false,
     )?;
 
     // Copy the source files to the sysroot (Rust for Linux needs this).
     let sysroot_src_path = start_dir.join("sysroot/lib/rustlib/src/rust");
-    fs::create_dir_all(&sysroot_src_path).map_err(|error| {
+    create_dir(&sysroot_src_path)?;
-        format!(
+    run_command(&[&"cp", &"-r", &start_dir.join("sysroot_src/library/"), &sysroot_src_path], None)?;
-            "Failed to create directory `{}`: {:?}",
-            sysroot_src_path.display(),
-            error
-        )
-    })?;
-    run_command(
-        &[
-            &"cp",
-            &"-r",
-            &start_dir.join("sysroot_src/library/"),
-            &sysroot_src_path,
-        ],
-        None,
-    )?;
 
     Ok(())
 }
@@ -174,20 +190,11 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
 fn build_codegen(args: &mut BuildArg) -> Result<(), String> {
     let mut env = HashMap::new();
 
-    env.insert(
+    env.insert("LD_LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
-        "LD_LIBRARY_PATH".to_string(),
+    env.insert("LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
-        args.config_info.gcc_path.clone(),
-    );
-    env.insert(
-        "LIBRARY_PATH".to_string(),
-        args.config_info.gcc_path.clone(),
-    );
 
     if args.config_info.no_default_features {
-        env.insert(
+        env.insert("RUSTFLAGS".to_string(), "-Csymbol-mangling-version=v0".to_string());
-            "RUSTFLAGS".to_string(),
-            "-Csymbol-mangling-version=v0".to_string(),
-        );
     }
 
     let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"rustc"];
@@ -212,18 +219,15 @@ fn build_codegen(args: &mut BuildArg) -> Result<(), String> {
     // We voluntarily ignore the error.
     let _ = fs::remove_dir_all("target/out");
     let gccjit_target = "target/out/gccjit";
-    fs::create_dir_all(gccjit_target).map_err(|error| {
+    create_dir(gccjit_target)?;
-        format!(
+    if args.build_sysroot {
-            "Failed to create directory `{}`: {:?}",
+        println!("[BUILD] sysroot");
-            gccjit_target, error
+        build_sysroot(&env, &args.config_info)?;
-        )
+    }
-    })?;
-
-    println!("[BUILD] sysroot");
-    build_sysroot(&env, &args.config_info)?;
     Ok(())
 }
 
+/// Executes the build process.
 pub fn run() -> Result<(), String> {
     let mut args = match BuildArg::new()? {
         Some(args) => args,

compiler/rustc_codegen_gcc/build_system/src/cargo.rs

@@ -1,114 +0,0 @@
-use crate::config::ConfigInfo;
-use crate::utils::{
-    get_toolchain, run_command_with_output_and_env_no_err, rustc_toolchain_version_info,
-    rustc_version_info,
-};
-
-use std::collections::HashMap;
-use std::ffi::OsStr;
-use std::path::PathBuf;
-
-fn args() -> Result<Option<Vec<String>>, String> {
-    // We skip the binary and the "cargo" option.
-    if let Some("--help") = std::env::args().skip(2).next().as_deref() {
-        usage();
-        return Ok(None);
-    }
-    let args = std::env::args().skip(2).collect::<Vec<_>>();
-    if args.is_empty() {
-        return Err(
-            "Expected at least one argument for `cargo` subcommand, found none".to_string(),
-        );
-    }
-    Ok(Some(args))
-}
-
-fn usage() {
-    println!(
-        r#"
-`cargo` command help:
-
-    [args]     : Arguments to be passed to the cargo command
-    --help     : Show this help
-"#
-    )
-}
-
-pub fn run() -> Result<(), String> {
-    let args = match args()? {
-        Some(a) => a,
-        None => return Ok(()),
-    };
-
-    // We first need to go to the original location to ensure that the config setup will go as
-    // expected.
-    let current_dir = std::env::current_dir()
-        .and_then(|path| path.canonicalize())
-        .map_err(|error| format!("Failed to get current directory path: {:?}", error))?;
-    let current_exe = std::env::current_exe()
-        .and_then(|path| path.canonicalize())
-        .map_err(|error| format!("Failed to get current exe path: {:?}", error))?;
-    let mut parent_dir = current_exe
-        .components()
-        .map(|comp| comp.as_os_str())
-        .collect::<Vec<_>>();
-    // We run this script from "build_system/target/release/y", so we need to remove these elements.
-    for to_remove in &["y", "release", "target", "build_system"] {
-        if parent_dir
-            .last()
-            .map(|part| part == to_remove)
-            .unwrap_or(false)
-        {
-            parent_dir.pop();
-        } else {
-            return Err(format!(
-                "Build script not executed from `build_system/target/release/y` (in path {})",
-                current_exe.display(),
-            ));
-        }
-    }
-    let parent_dir = PathBuf::from(parent_dir.join(&OsStr::new("/")));
-    std::env::set_current_dir(&parent_dir).map_err(|error| {
-        format!(
-            "Failed to go to `{}` folder: {:?}",
-            parent_dir.display(),
-            error
-        )
-    })?;
-
-    let mut env: HashMap<String, String> = std::env::vars().collect();
-    ConfigInfo::default().setup(&mut env, false)?;
-    let toolchain = get_toolchain()?;
-
-    let toolchain_version = rustc_toolchain_version_info(&toolchain)?;
-    let default_version = rustc_version_info(None)?;
-    if toolchain_version != default_version {
-        println!(
-            "rustc_codegen_gcc is built for {} but the default rustc version is {}.",
-            toolchain_version.short, default_version.short,
-        );
-        println!("Using {}.", toolchain_version.short);
-    }
-
-    // We go back to the original folder since we now have set up everything we needed.
-    std::env::set_current_dir(&current_dir).map_err(|error| {
-        format!(
-            "Failed to go back to `{}` folder: {:?}",
-            current_dir.display(),
-            error
-        )
-    })?;
-
-    let rustflags = env.get("RUSTFLAGS").cloned().unwrap_or_default();
-    env.insert("RUSTDOCFLAGS".to_string(), rustflags);
-    let toolchain = format!("+{}", toolchain);
-    let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &toolchain];
-    for arg in &args {
-        command.push(arg);
-    }
-    if run_command_with_output_and_env_no_err(&command, None, Some(&env)).is_err() {
-        std::process::exit(1);
-    }
-
-    Ok(())
-}

compiler/rustc_codegen_gcc/build_system/src/clean.rs

@@ -1,4 +1,4 @@
-use crate::utils::{remove_file, run_command};
+use crate::utils::{get_sysroot_dir, remove_file, run_command};
 
 use std::fs::remove_dir_all;
 use std::path::Path;
@@ -42,11 +42,12 @@ fn usage() {
 }
 
 fn clean_all() -> Result<(), String> {
+    let build_sysroot = get_sysroot_dir();
     let dirs_to_remove = [
-        "target",
+        "target".into(),
-        "build_sysroot/sysroot",
+        build_sysroot.join("sysroot"),
-        "build_sysroot/sysroot_src",
+        build_sysroot.join("sysroot_src"),
-        "build_sysroot/target",
+        build_sysroot.join("target"),
     ];
     for dir in dirs_to_remove {
         let _ = remove_dir_all(dir);
@@ -56,10 +57,11 @@ fn clean_all() -> Result<(), String> {
         let _ = remove_dir_all(Path::new(crate::BUILD_DIR).join(dir));
     }
 
-    let files_to_remove = ["build_sysroot/Cargo.lock", "perf.data", "perf.data.old"];
+    let files_to_remove =
+        [build_sysroot.join("Cargo.lock"), "perf.data".into(), "perf.data.old".into()];
 
     for file in files_to_remove {
-        let _ = remove_file(file);
+        let _ = remove_file(&file);
     }
 
     println!("Successfully ran `clean all`");

compiler/rustc_codegen_gcc/build_system/src/config.rs

@@ -1,5 +1,6 @@
 use crate::utils::{
-    create_symlink, get_os_name, run_command_with_output, rustc_version_info, split_args,
+    create_dir, create_symlink, get_os_name, get_sysroot_dir, run_command_with_output,
+    rustc_version_info, split_args,
 };
 use std::collections::HashMap;
 use std::env as std_env;
@@ -26,11 +27,7 @@ impl Channel {
 }
 
 fn failed_config_parsing(config_file: &Path, err: &str) -> Result<ConfigFile, String> {
-    Err(format!(
+    Err(format!("Failed to parse `{}`: {}", config_file.display(), err))
-        "Failed to parse `{}`: {}",
-        config_file.display(),
-        err
-    ))
 }
 
 #[derive(Default)]
@@ -48,11 +45,7 @@ impl ConfigFile {
             )
         })?;
         let toml = Toml::parse(&content).map_err(|err| {
-            format!(
+            format!("Error occurred around `{}`: {:?}", &content[err.start..=err.end], err.kind)
-                "Error occurred around `{}`: {:?}",
-                &content[err.start..=err.end],
-                err.kind
-            )
         })?;
         let mut config = Self::default();
         for (key, value) in toml.iter() {
@@ -181,11 +174,7 @@ impl ConfigInfo {
             },
             "--use-backend" => match args.next() {
                 Some(backend) if !backend.is_empty() => self.backend = Some(backend),
-                _ => {
+                _ => return Err("Expected an argument after `--use-backend`, found nothing".into()),
-                    return Err(
-                        "Expected an argument after `--use-backend`, found nothing".into()
-                    )
-                }
             },
             "--no-default-features" => self.no_default_features = true,
             _ => return Ok(false),
@@ -228,20 +217,10 @@ impl ConfigInfo {
 
         let output_dir = output_dir.join(&commit);
         if !output_dir.is_dir() {
-            std::fs::create_dir_all(&output_dir).map_err(|err| {
+            create_dir(&output_dir)?;
-                format!(
-                    "failed to create folder `{}`: {:?}",
-                    output_dir.display(),
-                    err,
-                )
-            })?;
         }
         let output_dir = output_dir.canonicalize().map_err(|err| {
-            format!(
+            format!("Failed to get absolute path of `{}`: {:?}", output_dir.display(), err)
-                "Failed to get absolute path of `{}`: {:?}",
-                output_dir.display(),
-                err
-            )
         })?;
 
         let libgccjit_so_name = "libgccjit.so";
@@ -252,13 +231,7 @@ impl ConfigInfo {
             let tempfile = output_dir.join(&tempfile_name);
             let is_in_ci = std::env::var("GITHUB_ACTIONS").is_ok();
 
-            let url = format!(
+            download_gccjit(&commit, &output_dir, tempfile_name, !is_in_ci)?;
-                "https://github.com/antoyo/gcc/releases/download/master-{}/libgccjit.so",
-                commit,
-            );
-
-            println!("Downloading `{}`...", url);
-            download_gccjit(url, &output_dir, tempfile_name, !is_in_ci)?;
 
             let libgccjit_so = output_dir.join(libgccjit_so_name);
             // If we reach this point, it means the file was correctly downloaded, so let's
@@ -275,10 +248,7 @@ impl ConfigInfo {
             println!("Downloaded libgccjit.so version {} successfully!", commit);
             // We need to create a link named `libgccjit.so.0` because that's what the linker is
             // looking for.
-            create_symlink(
+            create_symlink(&libgccjit_so, output_dir.join(&format!("{}.0", libgccjit_so_name)))?;
-                &libgccjit_so,
-                output_dir.join(&format!("{}.0", libgccjit_so_name)),
-            )?;
         }
 
         self.gcc_path = output_dir.display().to_string();
@@ -298,10 +268,7 @@ impl ConfigInfo {
             Some(config_file) => config_file.into(),
             None => self.compute_path("config.toml"),
         };
-        let ConfigFile {
+        let ConfigFile { gcc_path, download_gccjit } = ConfigFile::new(&config_file)?;
-            gcc_path,
-            download_gccjit,
-        } = ConfigFile::new(&config_file)?;
 
         if let Some(true) = download_gccjit {
             self.download_gccjit_if_needed()?;
@@ -310,10 +277,7 @@ impl ConfigInfo {
         self.gcc_path = match gcc_path {
             Some(path) => path,
             None => {
-                return Err(format!(
+                return Err(format!("missing `gcc-path` value from `{}`", config_file.display(),))
-                    "missing `gcc-path` value from `{}`",
-                    config_file.display(),
-                ))
             }
         };
         Ok(())
@@ -393,15 +357,16 @@ impl ConfigInfo {
             .join(&format!("librustc_codegen_gcc.{}", self.dylib_ext))
             .display()
             .to_string();
-        self.sysroot_path = current_dir
+        self.sysroot_path =
-            .join("build_sysroot/sysroot")
+            current_dir.join(&get_sysroot_dir()).join("sysroot").display().to_string();
-            .display()
-            .to_string();
         if let Some(backend) = &self.backend {
+            // This option is only used in the rust compiler testsuite. The sysroot is handled
+            // by its build system directly so no need to set it ourselves.
             rustflags.push(format!("-Zcodegen-backend={}", backend));
         } else {
             rustflags.extend_from_slice(&[
-                "--sysroot".to_string(), self.sysroot_path.clone(),
+                "--sysroot".to_string(),
+                self.sysroot_path.clone(),
                 format!("-Zcodegen-backend={}", self.cg_backend_path),
             ]);
         }
@@ -422,13 +387,6 @@ impl ConfigInfo {
             rustflags.push("-Csymbol-mangling-version=v0".to_string());
         }
 
-        rustflags.push("-Cdebuginfo=2".to_string());
-
-        // Since we don't support ThinLTO, disable LTO completely when not trying to do LTO.
-        // TODO(antoyo): remove when we can handle ThinLTO.
-        if !env.contains_key(&"FAT_LTO".to_string()) {
-            rustflags.push("-Clto=off".to_string());
-        }
         // FIXME(antoyo): remove once the atomic shim is gone
         if os_name == "Darwin" {
             rustflags.extend_from_slice(&[
@@ -440,10 +398,9 @@ impl ConfigInfo {
         // display metadata load errors
         env.insert("RUSTC_LOG".to_string(), "warn".to_string());
 
-        let sysroot = current_dir.join(&format!(
+        let sysroot = current_dir
-            "build_sysroot/sysroot/lib/rustlib/{}/lib",
+            .join(&get_sysroot_dir())
-            self.target_triple,
+            .join(&format!("sysroot/lib/rustlib/{}/lib", self.target_triple));
-        ));
         let ld_library_path = format!(
             "{target}:{sysroot}:{gcc_path}",
             target = self.cargo_target_dir,
@@ -501,11 +458,27 @@ impl ConfigInfo {
 }
 
 fn download_gccjit(
-    url: String,
+    commit: &str,
     output_dir: &Path,
     tempfile_name: String,
     with_progress_bar: bool,
 ) -> Result<(), String> {
+    let url = if std::env::consts::OS == "linux" && std::env::consts::ARCH == "x86_64" {
+        format!("https://github.com/rust-lang/gcc/releases/download/master-{}/libgccjit.so", commit)
+    } else {
+        eprintln!(
+            "\
+Pre-compiled libgccjit.so not available for this os or architecture.
+Please compile it yourself and update the `config.toml` file
+to `download-gccjit = false` and set `gcc-path` to the appropriate directory."
+        );
+        return Err(String::from(
+            "no appropriate pre-compiled libgccjit.so available for download",
+        ));
+    };
+
+    println!("Downloading `{}`...", url);
+
     // Try curl. If that fails and we are on windows, fallback to PowerShell.
     let mut ret = run_command_with_output(
         &[
@@ -521,11 +494,7 @@ fn download_gccjit(
             &"--retry",
             &"3",
             &"-SRfL",
-            if with_progress_bar {
+            if with_progress_bar { &"--progress-bar" } else { &"-s" },
-                &"--progress-bar"
-            } else {
-                &"-s"
-            },
             &url.as_str(),
         ],
         Some(&output_dir),

compiler/rustc_codegen_gcc/build_system/src/fmt.rs

@@ -0,0 +1,35 @@
+use crate::utils::run_command_with_output;
+use std::ffi::OsStr;
+use std::path::Path;
+
+fn show_usage() {
+    println!(
+        r#"
+`fmt` command help:
+
+    --check                : Pass `--check` argument to `cargo fmt` commands
+    --help                 : Show this help"#
+    );
+}
+
+pub fn run() -> Result<(), String> {
+    let mut check = false;
+    // We skip binary name and the `info` command.
+    let mut args = std::env::args().skip(2);
+    while let Some(arg) = args.next() {
+        match arg.as_str() {
+            "--help" => {
+                show_usage();
+                return Ok(());
+            }
+            "--check" => check = true,
+            _ => return Err(format!("Unknown option {}", arg)),
+        }
+    }
+
+    let cmd: &[&dyn AsRef<OsStr>] =
+        if check { &[&"cargo", &"fmt", &"--check"] } else { &[&"cargo", &"fmt"] };
+
+    run_command_with_output(cmd, Some(&Path::new(".")))?;
+    run_command_with_output(cmd, Some(&Path::new("build_system")))
+}

compiler/rustc_codegen_gcc/build_system/src/main.rs

@@ -2,12 +2,13 @@ use std::env;
 use std::process;
 
 mod build;
-mod cargo;
 mod clean;
 mod clone_gcc;
 mod config;
+mod fmt;
 mod info;
 mod prepare;
+mod rust_tools;
 mod rustc_info;
 mod test;
 mod utils;
@@ -26,16 +27,23 @@ macro_rules! arg_error {
 fn usage() {
     println!(
         "\
-Available commands for build_system:
+rustc_codegen_gcc build system
 
-    cargo     : Run cargo command
+Usage: build_system [command] [options]
-    clean     : Run clean command
+
-    prepare   : Run prepare command
+Options:
-    build     : Run build command
+        --help    : Displays this help message.
-    test      : Run test command
+
-    info      : Run info command
+Commands:
-    clone-gcc : Run clone-gcc command
+        cargo     : Executes a cargo command. 
-    --help    : Show this message"
+        rustc     : Compiles the program using the GCC compiler.
+        clean     : Cleans the build directory, removing all compiled files and artifacts.
+        prepare   : Prepares the environment for building, including fetching dependencies and setting up configurations.
+        build     : Compiles the project. 
+        test      : Runs tests for the project.
+        info      : Displays information about the build environment and project configuration.
+        clone-gcc : Clones the GCC compiler from a specified source.
+        fmt       : Runs rustfmt"
     );
 }
 
@@ -45,8 +53,10 @@ pub enum Command {
     CloneGcc,
     Prepare,
     Build,
+    Rustc,
     Test,
     Info,
+    Fmt,
 }
 
 fn main() {
@@ -56,12 +66,14 @@ fn main() {
 
     let command = match env::args().nth(1).as_deref() {
         Some("cargo") => Command::Cargo,
+        Some("rustc") => Command::Rustc,
         Some("clean") => Command::Clean,
         Some("prepare") => Command::Prepare,
         Some("build") => Command::Build,
         Some("test") => Command::Test,
         Some("info") => Command::Info,
         Some("clone-gcc") => Command::CloneGcc,
+        Some("fmt") => Command::Fmt,
         Some("--help") => {
             usage();
             process::exit(0);
@@ -75,13 +87,15 @@ fn main() {
     };
 
     if let Err(e) = match command {
-        Command::Cargo => cargo::run(),
+        Command::Cargo => rust_tools::run_cargo(),
+        Command::Rustc => rust_tools::run_rustc(),
         Command::Clean => clean::run(),
         Command::Prepare => prepare::run(),
         Command::Build => build::run(),
         Command::Test => test::run(),
         Command::Info => info::run(),
         Command::CloneGcc => clone_gcc::run(),
+        Command::Fmt => fmt::run(),
     } {
         eprintln!("Command failed to run: {e}");
         process::exit(1);

compiler/rustc_codegen_gcc/build_system/src/prepare.rs

@@ -1,58 +1,58 @@
 use crate::rustc_info::get_rustc_path;
 use crate::utils::{
-    cargo_install, git_clone_root_dir, remove_file, run_command, run_command_with_output, walk_dir,
+    cargo_install, create_dir, get_sysroot_dir, git_clone_root_dir, remove_file, run_command,
+    run_command_with_output, walk_dir,
 };
 
 use std::fs;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 fn prepare_libcore(
     sysroot_path: &Path,
     libgccjit12_patches: bool,
     cross_compile: bool,
+    sysroot_source: Option<String>,
 ) -> Result<(), String> {
-    let rustc_path = match get_rustc_path() {
+    let rustlib_dir: PathBuf;
-        Some(path) => path,
-        None => return Err("`rustc` path not found".to_string()),
-    };
 
-    let parent = match rustc_path.parent() {
+    if let Some(path) = sysroot_source {
-        Some(path) => path,
+        rustlib_dir = Path::new(&path)
-        None => return Err(format!("No parent for `{}`", rustc_path.display())),
+            .canonicalize()
-    };
+            .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
+        if !rustlib_dir.is_dir() {
+            return Err(format!("Custom sysroot path {:?} not found", rustlib_dir));
+        }
+    } else {
+        let rustc_path = match get_rustc_path() {
+            Some(path) => path,
+            None => return Err("`rustc` path not found".to_string()),
+        };
 
-    let rustlib_dir = parent
+        let parent = match rustc_path.parent() {
-        .join("../lib/rustlib/src/rust")
+            Some(path) => path,
-        .canonicalize()
+            None => return Err(format!("No parent for `{}`", rustc_path.display())),
-        .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
+        };
-    if !rustlib_dir.is_dir() {
+
-        return Err("Please install `rust-src` component".to_string());
+        rustlib_dir = parent
+            .join("../lib/rustlib/src/rust")
+            .canonicalize()
+            .map_err(|error| format!("Failed to canonicalize path: {:?}", error))?;
+        if !rustlib_dir.is_dir() {
+            return Err("Please install `rust-src` component".to_string());
+        }
     }
 
     let sysroot_dir = sysroot_path.join("sysroot_src");
     if sysroot_dir.is_dir() {
         if let Err(error) = fs::remove_dir_all(&sysroot_dir) {
-            return Err(format!(
+            return Err(format!("Failed to remove `{}`: {:?}", sysroot_dir.display(), error,));
-                "Failed to remove `{}`: {:?}",
-                sysroot_dir.display(),
-                error,
-            ));
         }
     }
 
     let sysroot_library_dir = sysroot_dir.join("library");
-    fs::create_dir_all(&sysroot_library_dir).map_err(|error| {
+    create_dir(&sysroot_library_dir)?;
-        format!(
-            "Failed to create folder `{}`: {:?}",
-            sysroot_library_dir.display(),
-            error,
-        )
-    })?;
 
-    run_command(
+    run_command(&[&"cp", &"-r", &rustlib_dir.join("library"), &sysroot_dir], None)?;
-        &[&"cp", &"-r", &rustlib_dir.join("library"), &sysroot_dir],
-        None,
-    )?;
 
     println!("[GIT] init (cwd): `{}`", sysroot_dir.display());
     run_command(&[&"git", &"init"], Some(&sysroot_dir))?;
@@ -63,70 +63,52 @@ fn prepare_libcore(
     // This is needed on systems where nothing is configured.
     // git really needs something here, or it will fail.
     // Even using --author is not enough.
-    run_command(
+    run_command(&[&"git", &"config", &"user.email", &"none@example.com"], Some(&sysroot_dir))?;
-        &[&"git", &"config", &"user.email", &"none@example.com"],
+    run_command(&[&"git", &"config", &"user.name", &"None"], Some(&sysroot_dir))?;
-        Some(&sysroot_dir),
+    run_command(&[&"git", &"config", &"core.autocrlf", &"false"], Some(&sysroot_dir))?;
-    )?;
+    run_command(&[&"git", &"config", &"commit.gpgSign", &"false"], Some(&sysroot_dir))?;
-    run_command(
+    run_command(&[&"git", &"commit", &"-m", &"Initial commit", &"-q"], Some(&sysroot_dir))?;
-        &[&"git", &"config", &"user.name", &"None"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"config", &"core.autocrlf", &"false"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"config", &"commit.gpgSign", &"false"],
-        Some(&sysroot_dir),
-    )?;
-    run_command(
-        &[&"git", &"commit", &"-m", &"Initial commit", &"-q"],
-        Some(&sysroot_dir),
-    )?;
 
     let mut patches = Vec::new();
     walk_dir(
         "patches",
-        |_| Ok(()),
+        &mut |_| Ok(()),
-        |file_path: &Path| {
+        &mut |file_path: &Path| {
             patches.push(file_path.to_path_buf());
             Ok(())
         },
+        false,
     )?;
     if cross_compile {
         walk_dir(
             "patches/cross_patches",
-            |_| Ok(()),
+            &mut |_| Ok(()),
-            |file_path: &Path| {
+            &mut |file_path: &Path| {
                 patches.push(file_path.to_path_buf());
                 Ok(())
             },
+            false,
         )?;
     }
     if libgccjit12_patches {
         walk_dir(
             "patches/libgccjit12",
-            |_| Ok(()),
+            &mut |_| Ok(()),
-            |file_path: &Path| {
+            &mut |file_path: &Path| {
                 patches.push(file_path.to_path_buf());
                 Ok(())
             },
+            false,
         )?;
     }
     patches.sort();
     for file_path in patches {
         println!("[GIT] apply `{}`", file_path.display());
-        let path = Path::new("../..").join(file_path);
+        let path = Path::new("../../..").join(file_path);
         run_command_with_output(&[&"git", &"apply", &path], Some(&sysroot_dir))?;
         run_command_with_output(&[&"git", &"add", &"-A"], Some(&sysroot_dir))?;
         run_command_with_output(
-            &[
+            &[&"git", &"commit", &"--no-gpg-sign", &"-m", &format!("Patch {}", path.display())],
-                &"git",
-                &"commit",
-                &"--no-gpg-sign",
-                &"-m",
-                &format!("Patch {}", path.display()),
-            ],
             Some(&sysroot_dir),
         )?;
     }
@@ -145,13 +127,7 @@ fn prepare_rand() -> Result<(), String> {
     run_command_with_output(&[&"git", &"apply", &path], Some(rand_dir))?;
     run_command_with_output(&[&"git", &"add", &"-A"], Some(rand_dir))?;
     run_command_with_output(
-        &[
+        &[&"git", &"commit", &"--no-gpg-sign", &"-m", &format!("Patch {}", path.display())],
-            &"git",
-            &"commit",
-            &"--no-gpg-sign",
-            &"-m",
-            &format!("Patch {}", path.display()),
-        ],
         Some(rand_dir),
     )?;
 
@@ -165,10 +141,7 @@ fn build_raytracer(repo_dir: &Path) -> Result<(), String> {
     if mv_target.is_file() {
         remove_file(&mv_target)?;
     }
-    run_command(
+    run_command(&[&"mv", &"target/debug/main", &"raytracer_cg_llvm"], Some(repo_dir))?;
-        &[&"mv", &"target/debug/main", &"raytracer_cg_llvm"],
-        Some(repo_dir),
-    )?;
     Ok(())
 }
 
@@ -193,6 +166,7 @@ struct PrepareArg {
     cross_compile: bool,
     only_libcore: bool,
     libgccjit12_patches: bool,
+    sysroot_source: Option<String>,
 }
 
 impl PrepareArg {
@@ -200,12 +174,23 @@ impl PrepareArg {
         let mut only_libcore = false;
         let mut cross_compile = false;
         let mut libgccjit12_patches = false;
+        let mut sysroot_source = None;
 
-        for arg in std::env::args().skip(2) {
+        let mut args = std::env::args().skip(2);
+        while let Some(arg) = args.next() {
             match arg.as_str() {
                 "--only-libcore" => only_libcore = true,
                 "--cross" => cross_compile = true,
                 "--libgccjit12-patches" => libgccjit12_patches = true,
+                "--sysroot-source" => {
+                    if let Some(path) = args.next() {
+                        sysroot_source = Some(path);
+                    } else {
+                        return Err(
+                            "Expected a value after `--sysroot-source`, found nothing".to_string()
+                        );
+                    }
+                }
                 "--help" => {
                     Self::usage();
                     return Ok(None);
@@ -213,11 +198,7 @@ impl PrepareArg {
                 a => return Err(format!("Unknown argument `{a}`")),
             }
         }
-        Ok(Some(Self {
+        Ok(Some(Self { cross_compile, only_libcore, libgccjit12_patches, sysroot_source }))
-            cross_compile,
-            only_libcore,
-            libgccjit12_patches,
-        }))
     }
 
     fn usage() {
@@ -228,6 +209,7 @@ impl PrepareArg {
     --only-libcore           : Only setup libcore and don't clone other repositories
     --cross                  : Apply the patches needed to do cross-compilation
     --libgccjit12-patches    : Apply patches needed for libgccjit12
+    --sysroot-source         : Specify custom path for sysroot source
     --help                   : Show this help"#
         )
     }
@@ -238,8 +220,13 @@ pub fn run() -> Result<(), String> {
         Some(a) => a,
         None => return Ok(()),
     };
-    let sysroot_path = Path::new("build_sysroot");
+    let sysroot_path = get_sysroot_dir();
-    prepare_libcore(sysroot_path, args.libgccjit12_patches, args.cross_compile)?;
+    prepare_libcore(
+        &sysroot_path,
+        args.libgccjit12_patches,
+        args.cross_compile,
+        args.sysroot_source,
+    )?;
 
     if !args.only_libcore {
         cargo_install("hyperfine")?;

compiler/rustc_codegen_gcc/build_system/src/rust_tools.rs

@@ -0,0 +1,125 @@
+use crate::config::ConfigInfo;
+use crate::utils::{
+    get_toolchain, run_command_with_output_and_env_no_err, rustc_toolchain_version_info,
+    rustc_version_info,
+};
+
+use std::collections::HashMap;
+use std::ffi::OsStr;
+use std::path::PathBuf;
+
+fn args(command: &str) -> Result<Option<Vec<String>>, String> {
+    // We skip the binary and the "cargo"/"rustc" option.
+    if let Some("--help") = std::env::args().skip(2).next().as_deref() {
+        usage(command);
+        return Ok(None);
+    }
+    let args = std::env::args().skip(2).collect::<Vec<_>>();
+    if args.is_empty() {
+        return Err(format!(
+            "Expected at least one argument for `{}` subcommand, found none",
+            command
+        ));
+    }
+    Ok(Some(args))
+}
+
+fn usage(command: &str) {
+    println!(
+        r#"
+`{}` command help:
+
+    [args]     : Arguments to be passed to the cargo command
+    --help     : Show this help
+"#,
+        command,
+    )
+}
+
+struct RustcTools {
+    env: HashMap<String, String>,
+    args: Vec<String>,
+    toolchain: String,
+    config: ConfigInfo,
+}
+
+impl RustcTools {
+    fn new(command: &str) -> Result<Option<Self>, String> {
+        let Some(args) = args(command)? else { return Ok(None) };
+
+        // We first need to go to the original location to ensure that the config setup will go as
+        // expected.
+        let current_dir = std::env::current_dir()
+            .and_then(|path| path.canonicalize())
+            .map_err(|error| format!("Failed to get current directory path: {:?}", error))?;
+        let current_exe = std::env::current_exe()
+            .and_then(|path| path.canonicalize())
+            .map_err(|error| format!("Failed to get current exe path: {:?}", error))?;
+        let mut parent_dir =
+            current_exe.components().map(|comp| comp.as_os_str()).collect::<Vec<_>>();
+        // We run this script from "build_system/target/release/y", so we need to remove these elements.
+        for to_remove in &["y", "release", "target", "build_system"] {
+            if parent_dir.last().map(|part| part == to_remove).unwrap_or(false) {
+                parent_dir.pop();
+            } else {
+                return Err(format!(
+                    "Build script not executed from `build_system/target/release/y` (in path {})",
+                    current_exe.display(),
+                ));
+            }
+        }
+        let parent_dir = PathBuf::from(parent_dir.join(&OsStr::new("/")));
+        std::env::set_current_dir(&parent_dir).map_err(|error| {
+            format!("Failed to go to `{}` folder: {:?}", parent_dir.display(), error)
+        })?;
+
+        let mut env: HashMap<String, String> = std::env::vars().collect();
+        let mut config = ConfigInfo::default();
+        config.setup(&mut env, false)?;
+        let toolchain = get_toolchain()?;
+
+        let toolchain_version = rustc_toolchain_version_info(&toolchain)?;
+        let default_version = rustc_version_info(None)?;
+        if toolchain_version != default_version {
+            println!(
+                "rustc_codegen_gcc is built for {} but the default rustc version is {}.",
+                toolchain_version.short, default_version.short,
+            );
+            println!("Using {}.", toolchain_version.short);
+        }
+
+        // We go back to the original folder since we now have set up everything we needed.
+        std::env::set_current_dir(&current_dir).map_err(|error| {
+            format!("Failed to go back to `{}` folder: {:?}", current_dir.display(), error)
+        })?;
+        let toolchain = format!("+{}", toolchain);
+        Ok(Some(Self { toolchain, args, env, config }))
+    }
+}
+
+pub fn run_cargo() -> Result<(), String> {
+    let Some(mut tools) = RustcTools::new("cargo")? else { return Ok(()) };
+    let rustflags = tools.env.get("RUSTFLAGS").cloned().unwrap_or_default();
+    tools.env.insert("RUSTDOCFLAGS".to_string(), rustflags);
+    let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &tools.toolchain];
+    for arg in &tools.args {
+        command.push(arg);
+    }
+    if run_command_with_output_and_env_no_err(&command, None, Some(&tools.env)).is_err() {
+        std::process::exit(1);
+    }
+
+    Ok(())
+}
+
+pub fn run_rustc() -> Result<(), String> {
+    let Some(tools) = RustcTools::new("rustc")? else { return Ok(()) };
+    let mut command = tools.config.rustc_command_vec();
+    for arg in &tools.args {
+        command.push(arg);
+    }
+    if run_command_with_output_and_env_no_err(&command, None, Some(&tools.env)).is_err() {
+        std::process::exit(1);
+    }
+    Ok(())
+}

compiler/rustc_codegen_gcc/build_system/src/test.rs

@@ -1,13 +1,14 @@
 use crate::build;
 use crate::config::{Channel, ConfigInfo};
 use crate::utils::{
-    get_toolchain, git_clone, git_clone_root_dir, remove_file, run_command, run_command_with_env,
+    create_dir, get_sysroot_dir, get_toolchain, git_clone, git_clone_root_dir, remove_file,
-    run_command_with_output_and_env, rustc_version_info, split_args, walk_dir,
+    run_command, run_command_with_env, run_command_with_output_and_env, rustc_version_info,
+    split_args, walk_dir,
 };
 
-use std::collections::{BTreeSet, HashMap};
+use std::collections::HashMap;
 use std::ffi::OsStr;
-use std::fs::{create_dir_all, remove_dir_all, File};
+use std::fs::{remove_dir_all, File};
 use std::io::{BufRead, BufReader};
 use std::path::{Path, PathBuf};
 use std::str::FromStr;
@@ -19,46 +20,27 @@ type Runners = HashMap<&'static str, (&'static str, Runner)>;
 fn get_runners() -> Runners {
     let mut runners = HashMap::new();
 
+    runners.insert("--test-rustc", ("Run all rustc tests", test_rustc as Runner));
+    runners
+        .insert("--test-successful-rustc", ("Run successful rustc tests", test_successful_rustc));
     runners.insert(
-        "--test-rustc",
+        "--test-failing-ui-pattern-tests",
-        ("Run all rustc tests", test_rustc as Runner),
+        ("Run failing ui pattern tests", test_failing_ui_pattern_tests),
-    );
-    runners.insert(
-        "--test-successful-rustc",
-        ("Run successful rustc tests", test_successful_rustc),
-    );
-    runners.insert(
-        "--test-failing-rustc",
-        ("Run failing rustc tests", test_failing_rustc),
-    );
-    runners.insert(
-        "--projects",
-        ("Run the tests of popular crates", test_projects),
     );
+    runners.insert("--test-failing-rustc", ("Run failing rustc tests", test_failing_rustc));
+    runners.insert("--projects", ("Run the tests of popular crates", test_projects));
     runners.insert("--test-libcore", ("Run libcore tests", test_libcore));
     runners.insert("--clean", ("Empty cargo target directory", clean));
     runners.insert("--build-sysroot", ("Build sysroot", build_sysroot));
     runners.insert("--std-tests", ("Run std tests", std_tests));
     runners.insert("--asm-tests", ("Run asm tests", asm_tests));
-    runners.insert(
+    runners.insert("--extended-tests", ("Run extended sysroot tests", extended_sysroot_tests));
-        "--extended-tests",
+    runners.insert("--extended-rand-tests", ("Run extended rand tests", extended_rand_tests));
-        ("Run extended sysroot tests", extended_sysroot_tests),
-    );
-    runners.insert(
-        "--extended-rand-tests",
-        ("Run extended rand tests", extended_rand_tests),
-    );
     runners.insert(
         "--extended-regex-example-tests",
-        (
+        ("Run extended regex example tests", extended_regex_example_tests),
-            "Run extended regex example tests",
-            extended_regex_example_tests,
-        ),
-    );
-    runners.insert(
-        "--extended-regex-tests",
-        ("Run extended regex tests", extended_regex_tests),
     );
+    runners.insert("--extended-regex-tests", ("Run extended regex tests", extended_regex_tests));
     runners.insert("--mini-tests", ("Run mini tests", mini_tests));
 
     runners
@@ -71,15 +53,9 @@ fn get_number_after_arg(
     match args.next() {
         Some(nb) if !nb.is_empty() => match usize::from_str(&nb) {
             Ok(nb) => Ok(nb),
-            Err(_) => Err(format!(
+            Err(_) => Err(format!("Expected a number after `{}`, found `{}`", option, nb)),
-                "Expected a number after `{}`, found `{}`",
-                option, nb
-            )),
         },
-        _ => Err(format!(
+        _ => Err(format!("Expected a number after `{}`, found nothing", option)),
-            "Expected a number after `{}`, found nothing",
-            option
-        )),
     }
 }
 
@@ -110,7 +86,7 @@ fn show_usage() {
 struct TestArg {
     build_only: bool,
     use_system_gcc: bool,
-    runners: BTreeSet<String>,
+    runners: Vec<String>,
     flags: Vec<String>,
     nb_parts: Option<usize>,
     current_part: Option<usize>,
@@ -130,9 +106,7 @@ impl TestArg {
             match arg.as_str() {
                 "--features" => match args.next() {
                     Some(feature) if !feature.is_empty() => {
-                        test_arg
+                        test_arg.flags.extend_from_slice(&["--features".into(), feature]);
-                            .flags
-                            .extend_from_slice(&["--features".into(), feature]);
                     }
                     _ => {
                         return Err("Expected an argument after `--features`, found nothing".into())
@@ -157,8 +131,10 @@ impl TestArg {
                     show_usage();
                     return Ok(None);
                 }
-                x if runners.contains_key(x) => {
+                x if runners.contains_key(x)
-                    test_arg.runners.insert(x.into());
+                    && !test_arg.runners.iter().any(|runner| runner == x) =>
+                {
+                    test_arg.runners.push(x.into());
                 }
                 arg => {
                     if !test_arg.config_info.parse_argument(arg, &mut args)? {
@@ -211,8 +187,7 @@ fn build_if_no_backend(env: &Env, args: &TestArg) -> Result<(), String> {
 fn clean(_env: &Env, args: &TestArg) -> Result<(), String> {
     let _ = std::fs::remove_dir_all(&args.config_info.cargo_target_dir);
     let path = Path::new(&args.config_info.cargo_target_dir).join("gccjit");
-    std::fs::create_dir_all(&path)
+    create_dir(&path)
-        .map_err(|error| format!("failed to create folder `{}`: {:?}", path.display(), error))
 }
 
 fn mini_tests(env: &Env, args: &TestArg) -> Result<(), String> {
@@ -304,13 +279,8 @@ fn maybe_run_command_in_vm(
     let sudo_command: &[&dyn AsRef<OsStr>] = &[&"sudo", &"cp", &exe, &vm_exe_path];
     run_command_with_env(sudo_command, None, Some(env))?;
 
-    let mut vm_command: Vec<&dyn AsRef<OsStr>> = vec![
+    let mut vm_command: Vec<&dyn AsRef<OsStr>> =
-        &"sudo",
+        vec![&"sudo", &"chroot", &vm_dir, &"qemu-m68k-static", &inside_vm_exe_path];
-        &"chroot",
-        &vm_dir,
-        &"qemu-m68k-static",
-        &inside_vm_exe_path,
-    ];
     vm_command.extend_from_slice(command);
     run_command_with_output_and_env(&vm_command, Some(&vm_parent_dir), Some(env))?;
     Ok(())
@@ -399,11 +369,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     }
     run_command_with_env(&command, None, Some(env))?;
     maybe_run_command_in_vm(
-        &[
+        &[&cargo_target_dir.join("std_example"), &"--target", &args.config_info.target_triple],
-            &cargo_target_dir.join("std_example"),
-            &"--target",
-            &args.config_info.target_triple,
-        ],
         env,
         args,
     )?;
@@ -427,11 +393,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
         command.push(test_flag);
     }
     run_command_with_env(&command, None, Some(env))?;
-    maybe_run_command_in_vm(
+    maybe_run_command_in_vm(&[&cargo_target_dir.join("subslice-patterns-const-eval")], env, args)?;
-        &[&cargo_target_dir.join("subslice-patterns-const-eval")],
-        env,
-        args,
-    )?;
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[AOT] track-caller-attribute");
@@ -447,11 +409,7 @@ fn std_tests(env: &Env, args: &TestArg) -> Result<(), String> {
         command.push(test_flag);
     }
     run_command_with_env(&command, None, Some(env))?;
-    maybe_run_command_in_vm(
+    maybe_run_command_in_vm(&[&cargo_target_dir.join("track-caller-attribute")], env, args)?;
-        &[&cargo_target_dir.join("track-caller-attribute")],
-        env,
-        args,
-    )?;
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[AOT] mod_bench");
@@ -477,11 +435,7 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
     );
     let rust_dir_path = Path::new(crate::BUILD_DIR).join("rust");
     // If the repository was already cloned, command will fail, so doesn't matter.
-    let _ = git_clone(
+    let _ = git_clone("https://github.com/rust-lang/rust.git", Some(&rust_dir_path), false);
-        "https://github.com/rust-lang/rust.git",
-        Some(&rust_dir_path),
-        false,
-    );
     let rust_dir: Option<&Path> = Some(&rust_dir_path);
     run_command(&[&"git", &"checkout", &"--", &"tests/"], rust_dir)?;
     run_command_with_output_and_env(&[&"git", &"fetch"], rust_dir, Some(env))?;
@@ -511,12 +465,8 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
         }
     })?;
     let rustc = String::from_utf8(
-        run_command_with_env(
+        run_command_with_env(&[&"rustup", &toolchain, &"which", &"rustc"], rust_dir, Some(env))?
-            &[&"rustup", &toolchain, &"which", &"rustc"],
+            .stdout,
-            rust_dir,
-            Some(env),
-        )?
-        .stdout,
     )
     .map_err(|error| format!("Failed to retrieve rustc path: {:?}", error))
     .and_then(|rustc| {
@@ -573,13 +523,7 @@ download-ci-llvm = false
             llvm_filecheck = llvm_filecheck.trim(),
         ),
     )
-    .map_err(|error| {
+    .map_err(|error| format!("Failed to write into `{}`: {:?}", file_path.display(), error))?;
-        format!(
-            "Failed to write into `{}`: {:?}",
-            file_path.display(),
-            error
-        )
-    })?;
     Ok(rust_dir_path)
 }
 
@@ -591,21 +535,19 @@ fn asm_tests(env: &Env, args: &TestArg) -> Result<(), String> {
 
     env.insert("COMPILETEST_FORCE_STAGE0".to_string(), "1".to_string());
 
-    let extra = if args.is_using_gcc_master_branch() {
+    let extra =
-        ""
+        if args.is_using_gcc_master_branch() { "" } else { " -Csymbol-mangling-version=v0" };
-    } else {
-        " -Csymbol-mangling-version=v0"
-    };
 
     let rustc_args = &format!(
         r#"-Zpanic-abort-tests \
             -Zcodegen-backend="{pwd}/target/{channel}/librustc_codegen_gcc.{dylib_ext}" \
-            --sysroot "{pwd}/build_sysroot/sysroot" -Cpanic=abort{extra}"#,
+            --sysroot "{sysroot_dir}" -Cpanic=abort{extra}"#,
         pwd = std::env::current_dir()
             .map_err(|error| format!("`current_dir` failed: {:?}", error))?
             .display(),
         channel = args.config_info.channel.as_str(),
         dylib_ext = args.config_info.dylib_ext,
+        sysroot_dir = args.config_info.sysroot_path,
         extra = extra,
     );
 
@@ -703,20 +645,23 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
         //"https://github.com/rust-lang/cargo", // TODO: very slow, only run on master?
     ];
 
+    let mut env = env.clone();
+    let rustflags =
+        format!("{} --cap-lints allow", env.get("RUSTFLAGS").cloned().unwrap_or_default());
+    env.insert("RUSTFLAGS".to_string(), rustflags);
     let run_tests = |projects_path, iter: &mut dyn Iterator<Item = &&str>| -> Result<(), String> {
         for project in iter {
             let clone_result = git_clone_root_dir(project, projects_path, true)?;
             let repo_path = Path::new(&clone_result.repo_dir);
-            run_cargo_command(&[&"build", &"--release"], Some(repo_path), env, args)?;
+            run_cargo_command(&[&"build", &"--release"], Some(repo_path), &env, args)?;
-            run_cargo_command(&[&"test"], Some(repo_path), env, args)?;
+            run_cargo_command(&[&"test"], Some(repo_path), &env, args)?;
         }
 
         Ok(())
     };
 
     let projects_path = Path::new("projects");
-    create_dir_all(projects_path)
+    create_dir(projects_path)?;
-        .map_err(|err| format!("Failed to create directory `projects`: {}", err))?;
 
     let nb_parts = args.nb_parts.unwrap_or(0);
     if nb_parts > 0 {
@@ -737,9 +682,9 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
 fn test_libcore(env: &Env, args: &TestArg) -> Result<(), String> {
     // FIXME: create a function "display_if_not_quiet" or something along the line.
     println!("[TEST] libcore");
-    let path = Path::new("build_sysroot/sysroot_src/library/core/tests");
+    let path = get_sysroot_dir().join("sysroot_src/library/core/tests");
     let _ = remove_dir_all(path.join("target"));
-    run_cargo_command(&[&"test"], Some(path), env, args)?;
+    run_cargo_command(&[&"test"], Some(&path), env, args)?;
     Ok(())
 }
 
@@ -763,10 +708,8 @@ fn extended_rand_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     }
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
+    let rustflags =
-        "{} --cap-lints warn",
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
     env.insert("RUSTFLAGS".to_string(), rustflags);
 
     let path = Path::new(crate::BUILD_DIR).join("rand");
@@ -788,18 +731,11 @@ fn extended_regex_example_tests(env: &Env, args: &TestArg) -> Result<(), String>
     println!("[TEST] rust-lang/regex example shootout-regex-dna");
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
+    let rustflags =
-        "{} --cap-lints warn",
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
     env.insert("RUSTFLAGS".to_string(), rustflags);
     // Make sure `[codegen mono items] start` doesn't poison the diff
-    run_cargo_command(
+    run_cargo_command(&[&"build", &"--example", &"shootout-regex-dna"], Some(&path), &env, args)?;
-        &[&"build", &"--example", &"shootout-regex-dna"],
-        Some(&path),
-        &env,
-        args,
-    )?;
 
     run_cargo_command_with_callback(
         &[&"run", &"--example", &"shootout-regex-dna"],
@@ -810,10 +746,8 @@ fn extended_regex_example_tests(env: &Env, args: &TestArg) -> Result<(), String>
             // FIXME: rewrite this with `child.stdin.write_all()` because
             // `examples/regexdna-input.txt` is very small.
             let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"bash", &"-c"];
-            let cargo_args = cargo_command
+            let cargo_args =
-                .iter()
+                cargo_command.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>();
-                .map(|s| s.as_ref().to_str().unwrap())
-                .collect::<Vec<_>>();
             let bash_command = format!(
                 "cat examples/regexdna-input.txt | {} | grep -v 'Spawned thread' > res.txt",
                 cargo_args.join(" "),
@@ -841,10 +775,8 @@ fn extended_regex_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     println!("[TEST] rust-lang/regex tests");
     let mut env = env.clone();
     // newer aho_corasick versions throw a deprecation warning
-    let rustflags = format!(
+    let rustflags =
-        "{} --cap-lints warn",
+        format!("{} --cap-lints warn", env.get("RUSTFLAGS").cloned().unwrap_or_default());
-        env.get("RUSTFLAGS").cloned().unwrap_or_default()
-    );
     env.insert("RUSTFLAGS".to_string(), rustflags);
     let path = Path::new(crate::BUILD_DIR).join("regex");
     run_cargo_command(
@@ -884,7 +816,7 @@ fn extended_sysroot_tests(env: &Env, args: &TestArg) -> Result<(), String> {
     Ok(())
 }
 
-fn should_not_remove_test(file: &str) -> bool {
+fn valid_ui_error_pattern_test(file: &str) -> bool {
     // contains //~ERROR, but shouldn't be removed
     [
         "issues/auxiliary/issue-3136-a.rs",
@@ -899,7 +831,8 @@ fn should_not_remove_test(file: &str) -> bool {
     .any(|to_ignore| file.ends_with(to_ignore))
 }
 
-fn should_remove_test(file_path: &Path) -> Result<bool, String> {
+#[rustfmt::skip]
+fn contains_ui_error_patterns(file_path: &Path) -> Result<bool, String> {
     // Tests generating errors.
     let file = File::open(file_path)
         .map_err(|error| format!("Failed to read `{}`: {:?}", file_path.display(), error))?;
@@ -916,8 +849,8 @@ fn should_remove_test(file_path: &Path) -> Result<bool, String> {
             "//~",
             "thread",
         ]
-        .iter()
+            .iter()
-        .any(|check| line.contains(check))
+            .any(|check| line.contains(check))
         {
             return Ok(true);
         }
@@ -925,17 +858,27 @@ fn should_remove_test(file_path: &Path) -> Result<bool, String> {
             return Ok(true);
         }
     }
-    if file_path
+    if file_path.display().to_string().contains("ambiguous-4-extern.rs") {
-        .display()
-        .to_string()
-        .contains("ambiguous-4-extern.rs")
-    {
         eprintln!("nothing found for {file_path:?}");
     }
     Ok(false)
 }
 
-fn test_rustc_inner<F>(env: &Env, args: &TestArg, prepare_files_callback: F) -> Result<(), String>
+// # Parameters
+//
+// * `env`: An environment variable that provides context for the function.
+// * `args`: The arguments passed to the test. This could include things like the flags, config etc.
+// * `prepare_files_callback`: A callback function that prepares the files needed for the test. Its used to remove/retain tests giving Error to run various rust test suits.
+// * `run_error_pattern_test`: A boolean that determines whether to run only error pattern tests.
+// * `test_type`: A string that indicates the type of the test being run.
+//
+fn test_rustc_inner<F>(
+    env: &Env,
+    args: &TestArg,
+    prepare_files_callback: F,
+    run_error_pattern_test: bool,
+    test_type: &str,
+) -> Result<(), String>
 where
     F: Fn(&Path) -> Result<bool, String>,
 {
@@ -944,139 +887,138 @@ where
     let mut env = env.clone();
     let rust_path = setup_rustc(&mut env, args)?;
 
-    walk_dir(
-        rust_path.join("tests/ui"),
-        |dir| {
-            let dir_name = dir.file_name().and_then(|name| name.to_str()).unwrap_or("");
-            if [
-                "abi",
-                "extern",
-                "unsized-locals",
-                "proc-macro",
-                "threads-sendsync",
-                "borrowck",
-                "test-attrs",
-            ]
-            .iter()
-            .any(|name| *name == dir_name)
-            {
-                std::fs::remove_dir_all(dir).map_err(|error| {
-                    format!("Failed to remove folder `{}`: {:?}", dir.display(), error)
-                })?;
-            }
-            Ok(())
-        },
-        |_| Ok(()),
-    )?;
-
-    // These two functions are used to remove files that are known to not be working currently
-    // with the GCC backend to reduce noise.
-    fn dir_handling(dir: &Path) -> Result<(), String> {
-        if dir
-            .file_name()
-            .map(|name| name == "auxiliary")
-            .unwrap_or(true)
-        {
-            return Ok(());
-        }
-        walk_dir(dir, dir_handling, file_handling)
-    }
-    fn file_handling(file_path: &Path) -> Result<(), String> {
-        if !file_path
-            .extension()
-            .map(|extension| extension == "rs")
-            .unwrap_or(false)
-        {
-            return Ok(());
-        }
-        let path_str = file_path.display().to_string().replace("\\", "/");
-        if should_not_remove_test(&path_str) {
-            return Ok(());
-        } else if should_remove_test(file_path)? {
-            return remove_file(&file_path);
-        }
-        Ok(())
-    }
-
-    remove_file(&rust_path.join("tests/ui/consts/const_cmp_type_id.rs"))?;
-    remove_file(&rust_path.join("tests/ui/consts/issue-73976-monomorphic.rs"))?;
-    // this test is oom-killed in the CI.
-    remove_file(&rust_path.join("tests/ui/consts/issue-miri-1910.rs"))?;
-    // Tests generating errors.
-    remove_file(&rust_path.join("tests/ui/consts/issue-94675.rs"))?;
-    remove_file(&rust_path.join("tests/ui/mir/mir_heavy_promoted.rs"))?;
-    remove_file(&rust_path.join("tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop-fail.rs"))?;
-    remove_file(&rust_path.join("tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.rs"))?;
-
-    walk_dir(rust_path.join("tests/ui"), dir_handling, file_handling)?;
-
     if !prepare_files_callback(&rust_path)? {
         // FIXME: create a function "display_if_not_quiet" or something along the line.
-        println!("Keeping all UI tests");
+        println!("Keeping all {} tests", test_type);
     }
 
-    let nb_parts = args.nb_parts.unwrap_or(0);
+    if test_type == "ui" {
-    if nb_parts > 0 {
+        if run_error_pattern_test {
-        let current_part = args.current_part.unwrap();
+            // After we removed the error tests that are known to panic with rustc_codegen_gcc, we now remove the passing tests since this runs the error tests.
-        // FIXME: create a function "display_if_not_quiet" or something along the line.
+            walk_dir(
-        println!(
+                rust_path.join("tests/ui"),
-            "Splitting ui_test into {} parts (and running part {})",
+                &mut |_dir| Ok(()),
-            nb_parts, current_part
+                &mut |file_path| {
-        );
+                    if contains_ui_error_patterns(file_path)? {
-        let out = String::from_utf8(
+                        Ok(())
-            run_command(
+                    } else {
-                &[
+                        remove_file(file_path).map_err(|e| e.to_string())
-                    &"find",
+                    }
-                    &"tests/ui",
+                },
-                    &"-type",
+                true,
-                    &"f",
+            )?;
-                    &"-name",
+        } else {
-                    &"*.rs",
+            walk_dir(
-                    &"-not",
+                rust_path.join("tests/ui"),
-                    &"-path",
+                &mut |dir| {
-                    &"*/auxiliary/*",
+                    let dir_name = dir.file_name().and_then(|name| name.to_str()).unwrap_or("");
-                ],
+                    if [
-                Some(&rust_path),
+                        "abi",
-            )?
+                        "extern",
-            .stdout,
+                        "unsized-locals",
-        )
+                        "proc-macro",
-        .map_err(|error| format!("Failed to retrieve output of find command: {:?}", error))?;
+                        "threads-sendsync",
-        let mut files = out
+                        "borrowck",
-            .split('\n')
+                        "test-attrs",
-            .map(|line| line.trim())
+                    ]
-            .filter(|line| !line.is_empty())
+                    .iter()
-            .collect::<Vec<_>>();
+                    .any(|name| *name == dir_name)
-        // To ensure it'll be always the same sub files, we sort the content.
+                    {
-        files.sort();
+                        std::fs::remove_dir_all(dir).map_err(|error| {
-        // We increment the number of tests by one because if this is an odd number, we would skip
+                            format!("Failed to remove folder `{}`: {:?}", dir.display(), error)
-        // one test.
+                        })?;
-        let count = files.len() / nb_parts + 1;
+                    }
-        let start = current_part * count;
+                    Ok(())
-        // We remove the files we don't want to test.
+                },
-        for path in files.iter().skip(start).take(count) {
+                &mut |_| Ok(()),
-            remove_file(&rust_path.join(path))?;
+                false,
+            )?;
+
+            // These two functions are used to remove files that are known to not be working currently
+            // with the GCC backend to reduce noise.
+            fn dir_handling(dir: &Path) -> Result<(), String> {
+                if dir.file_name().map(|name| name == "auxiliary").unwrap_or(true) {
+                    return Ok(());
+                }
+
+                walk_dir(dir, &mut dir_handling, &mut file_handling, false)
+            }
+            fn file_handling(file_path: &Path) -> Result<(), String> {
+                if !file_path.extension().map(|extension| extension == "rs").unwrap_or(false) {
+                    return Ok(());
+                }
+                let path_str = file_path.display().to_string().replace("\\", "/");
+                if valid_ui_error_pattern_test(&path_str) {
+                    return Ok(());
+                } else if contains_ui_error_patterns(file_path)? {
+                    return remove_file(&file_path);
+                }
+                Ok(())
+            }
+
+            walk_dir(rust_path.join("tests/ui"), &mut dir_handling, &mut file_handling, false)?;
+        }
+        let nb_parts = args.nb_parts.unwrap_or(0);
+        if nb_parts > 0 {
+            let current_part = args.current_part.unwrap();
+            // FIXME: create a function "display_if_not_quiet" or something along the line.
+            println!(
+                "Splitting ui_test into {} parts (and running part {})",
+                nb_parts, current_part
+            );
+            let out = String::from_utf8(
+                run_command(
+                    &[
+                        &"find",
+                        &"tests/ui",
+                        &"-type",
+                        &"f",
+                        &"-name",
+                        &"*.rs",
+                        &"-not",
+                        &"-path",
+                        &"*/auxiliary/*",
+                    ],
+                    Some(&rust_path),
+                )?
+                .stdout,
+            )
+            .map_err(|error| format!("Failed to retrieve output of find command: {:?}", error))?;
+            let mut files = out
+                .split('\n')
+                .map(|line| line.trim())
+                .filter(|line| !line.is_empty())
+                .collect::<Vec<_>>();
+            // To ensure it'll be always the same sub files, we sort the content.
+            files.sort();
+            // We increment the number of tests by one because if this is an odd number, we would skip
+            // one test.
+            let count = files.len() / nb_parts + 1;
+            // We remove the files we don't want to test.
+            let start = current_part * count;
+            for path in files.iter().skip(start).take(count) {
+                remove_file(&rust_path.join(path))?;
+            }
         }
     }
 
     // FIXME: create a function "display_if_not_quiet" or something along the line.
-    println!("[TEST] rustc test suite");
+    println!("[TEST] rustc {} test suite", test_type);
     env.insert("COMPILETEST_FORCE_STAGE0".to_string(), "1".to_string());
 
-    let extra = if args.is_using_gcc_master_branch() {
+    let extra =
-        ""
+        if args.is_using_gcc_master_branch() { "" } else { " -Csymbol-mangling-version=v0" };
-    } else {
-        " -Csymbol-mangling-version=v0"
-    };
 
     let rustc_args = format!(
-        "{} -Zcodegen-backend={} --sysroot {}{}",
+        "{test_flags} -Zcodegen-backend={backend} --sysroot {sysroot}{extra}",
-        env.get("TEST_FLAGS").unwrap_or(&String::new()),
+        test_flags = env.get("TEST_FLAGS").unwrap_or(&String::new()),
-        args.config_info.cg_backend_path,
+        backend = args.config_info.cg_backend_path,
-        args.config_info.sysroot_path,
+        sysroot = args.config_info.sysroot_path,
-        extra,
+        extra = extra,
     );
 
     env.get_mut("RUSTFLAGS").unwrap().clear();
+
     run_command_with_output_and_env(
         &[
             &"./x.py",
@@ -1085,7 +1027,7 @@ where
             &"always",
             &"--stage",
             &"0",
-            &"tests/ui",
+            &format!("tests/{}", test_type),
             &"--rustc-args",
             &rustc_args,
         ],
@@ -1096,68 +1038,162 @@ where
 }
 
 fn test_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    test_rustc_inner(env, args, |_| Ok(false))
+    //test_rustc_inner(env, args, |_| Ok(false), false, "run-make")?;
+    test_rustc_inner(env, args, |_| Ok(false), false, "ui")
 }
 
 fn test_failing_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
-    test_rustc_inner(env, args, |rust_path| {
+    let result1 = Ok(());
-        // Removing all tests.
+    /*test_rustc_inner(
-        run_command(
+        env,
-            &[
+        args,
-                &"find",
+        retain_files_callback("tests/failing-run-make-tests.txt", "run-make"),
-                &"tests/ui",
+        false,
-                &"-type",
+        "run-make",
-                &"f",
+    )*/
-                &"-name",
+
-                &"*.rs",
+    let result2 = test_rustc_inner(
-                &"-not",
+        env,
-                &"-path",
+        args,
-                &"*/auxiliary/*",
+        retain_files_callback("tests/failing-ui-tests.txt", "ui"),
-                &"-delete",
+        false,
-            ],
+        "ui",
-            Some(rust_path),
+    );
-        )?;
+
+    result1.and(result2)
+}
+
+fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
+    test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-ui-tests.txt", "ui"),
+        false,
+        "ui",
+    )?;
+    Ok(())
+    /*test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-run-make-tests.txt", "run-make"),
+        false,
+        "run-make",
+    )*/
+}
+
+fn test_failing_ui_pattern_tests(env: &Env, args: &TestArg) -> Result<(), String> {
+    test_rustc_inner(
+        env,
+        args,
+        remove_files_callback("tests/failing-ice-tests.txt", "ui"),
+        true,
+        "ui",
+    )
+}
+
+fn retain_files_callback<'a>(
+    file_path: &'a str,
+    test_type: &'a str,
+) -> impl Fn(&Path) -> Result<bool, String> + 'a {
+    move |rust_path| {
+        let files = std::fs::read_to_string(file_path).unwrap_or_default();
+        let first_file_name = files.lines().next().unwrap_or("");
+        // If the first line ends with a `/`, we treat all lines in the file as a directory.
+        if first_file_name.ends_with('/') {
+            // Treat as directory
+            // Removing all tests.
+            run_command(
+                &[
+                    &"find",
+                    &format!("tests/{}", test_type),
+                    &"-mindepth",
+                    &"1",
+                    &"-type",
+                    &"d",
+                    &"-exec",
+                    &"rm",
+                    &"-rf",
+                    &"{}",
+                    &"+",
+                ],
+                Some(rust_path),
+            )?;
+        } else {
+            // Treat as file
+            // Removing all tests.
+            run_command(
+                &[
+                    &"find",
+                    &format!("tests/{}", test_type),
+                    &"-type",
+                    &"f",
+                    &"-name",
+                    &"*.rs",
+                    &"-not",
+                    &"-path",
+                    &"*/auxiliary/*",
+                    &"-delete",
+                ],
+                Some(rust_path),
+            )?;
+        }
+
         // Putting back only the failing ones.
-        let path = "tests/failing-ui-tests.txt";
+        if let Ok(files) = std::fs::read_to_string(&file_path) {
-        if let Ok(files) = std::fs::read_to_string(path) {
+            for file in files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty()) {
-            for file in files
-                .split('\n')
-                .map(|line| line.trim())
-                .filter(|line| !line.is_empty())
-            {
                 run_command(&[&"git", &"checkout", &"--", &file], Some(&rust_path))?;
             }
         } else {
             println!(
-                "Failed to read `{}`, not putting back failing ui tests",
+                "Failed to read `{}`, not putting back failing {} tests",
-                path
+                file_path, test_type
             );
         }
+
         Ok(true)
-    })
+    }
 }
 
-fn test_successful_rustc(env: &Env, args: &TestArg) -> Result<(), String> {
+fn remove_files_callback<'a>(
-    test_rustc_inner(env, args, |rust_path| {
+    file_path: &'a str,
-        // Removing the failing tests.
+    test_type: &'a str,
-        let path = "tests/failing-ui-tests.txt";
+) -> impl Fn(&Path) -> Result<bool, String> + 'a {
-        if let Ok(files) = std::fs::read_to_string(path) {
+    move |rust_path| {
-            for file in files
+        let files = std::fs::read_to_string(file_path).unwrap_or_default();
-                .split('\n')
+        let first_file_name = files.lines().next().unwrap_or("");
-                .map(|line| line.trim())
+        // If the first line ends with a `/`, we treat all lines in the file as a directory.
-                .filter(|line| !line.is_empty())
+        if first_file_name.ends_with('/') {
-            {
+            // Removing the failing tests.
-                let path = rust_path.join(file);
+            if let Ok(files) = std::fs::read_to_string(file_path) {
-                remove_file(&path)?;
+                for file in
+                    files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty())
+                {
+                    let path = rust_path.join(file);
+                    if let Err(e) = std::fs::remove_dir_all(&path) {
+                        println!("Failed to remove directory `{}`: {}", path.display(), e);
+                    }
+                }
+            } else {
+                println!(
+                    "Failed to read `{}`, not putting back failing {} tests",
+                    file_path, test_type
+                );
             }
         } else {
-            println!(
+            // Removing the failing tests.
-                "Failed to read `{}`, not putting back failing ui tests",
+            if let Ok(files) = std::fs::read_to_string(file_path) {
-                path
+                for file in
-            );
+                    files.split('\n').map(|line| line.trim()).filter(|line| !line.is_empty())
+                {
+                    let path = rust_path.join(file);
+                    remove_file(&path)?;
+                }
+            } else {
+                println!("Failed to read `{}`, not putting back failing ui tests", file_path);
+            }
         }
         Ok(true)
-    })
+    }
 }
 
 fn run_all(env: &Env, args: &TestArg) -> Result<(), String> {
@@ -1181,14 +1217,8 @@ pub fn run() -> Result<(), String> {
 
     if !args.use_system_gcc {
         args.config_info.setup_gcc_path()?;
-        env.insert(
+        env.insert("LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
-            "LIBRARY_PATH".to_string(),
+        env.insert("LD_LIBRARY_PATH".to_string(), args.config_info.gcc_path.clone());
-            args.config_info.gcc_path.clone(),
-        );
-        env.insert(
-            "LD_LIBRARY_PATH".to_string(),
-            args.config_info.gcc_path.clone(),
-        );
     }
 
     build_if_no_backend(&env, &args)?;

compiler/rustc_codegen_gcc/build_system/src/utils.rs

@@ -1,10 +1,42 @@
 use std::collections::HashMap;
+#[cfg(unix)]
+use std::ffi::c_int;
 use std::ffi::OsStr;
 use std::fmt::Debug;
 use std::fs;
+#[cfg(unix)]
+use std::os::unix::process::ExitStatusExt;
 use std::path::{Path, PathBuf};
 use std::process::{Command, ExitStatus, Output};
 
+#[cfg(unix)]
+extern "C" {
+    fn raise(signal: c_int) -> c_int;
+}
+
+fn exec_command(
+    input: &[&dyn AsRef<OsStr>],
+    cwd: Option<&Path>,
+    env: Option<&HashMap<String, String>>,
+) -> Result<ExitStatus, String> {
+    let status = get_command_inner(input, cwd, env)
+        .spawn()
+        .map_err(|e| command_error(input, &cwd, e))?
+        .wait()
+        .map_err(|e| command_error(input, &cwd, e))?;
+    #[cfg(unix)]
+    {
+        if let Some(signal) = status.signal() {
+            unsafe {
+                raise(signal as _);
+            }
+            // In case the signal didn't kill the current process.
+            return Err(command_error(input, &cwd, format!("Process received signal {}", signal)));
+        }
+    }
+    Ok(status)
+}
+
 fn get_command_inner(
     input: &[&dyn AsRef<OsStr>],
     cwd: Option<&Path>,
@@ -37,13 +69,8 @@ fn check_exit_status(
     }
     let mut error = format!(
         "Command `{}`{} exited with status {:?}",
-        input
+        input.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>().join(" "),
-            .iter()
+        cwd.map(|cwd| format!(" (running in folder `{}`)", cwd.display())).unwrap_or_default(),
-            .map(|s| s.as_ref().to_str().unwrap())
-            .collect::<Vec<_>>()
-            .join(" "),
-        cwd.map(|cwd| format!(" (running in folder `{}`)", cwd.display()))
-            .unwrap_or_default(),
         exit_status.code()
     );
     let input = input.iter().map(|i| i.as_ref()).collect::<Vec<&OsStr>>();
@@ -68,11 +95,7 @@ fn check_exit_status(
 fn command_error<D: Debug>(input: &[&dyn AsRef<OsStr>], cwd: &Option<&Path>, error: D) -> String {
     format!(
         "Command `{}`{} failed to run: {error:?}",
-        input
+        input.iter().map(|s| s.as_ref().to_str().unwrap()).collect::<Vec<_>>().join(" "),
-            .iter()
-            .map(|s| s.as_ref().to_str().unwrap())
-            .collect::<Vec<_>>()
-            .join(" "),
         cwd.as_ref()
             .map(|cwd| format!(" (running in folder `{}`)", cwd.display(),))
             .unwrap_or_default(),
@@ -88,9 +111,8 @@ pub fn run_command_with_env(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<Output, String> {
-    let output = get_command_inner(input, cwd, env)
+    let output =
-        .output()
+        get_command_inner(input, cwd, env).output().map_err(|e| command_error(input, &cwd, e))?;
-        .map_err(|e| command_error(input, &cwd, e))?;
     check_exit_status(input, cwd, output.status, Some(&output), true)?;
     Ok(output)
 }
@@ -99,11 +121,7 @@ pub fn run_command_with_output(
     input: &[&dyn AsRef<OsStr>],
     cwd: Option<&Path>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, None)
+    let exit_status = exec_command(input, cwd, None)?;
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
     check_exit_status(input, cwd, exit_status, None, true)?;
     Ok(())
 }
@@ -113,11 +131,7 @@ pub fn run_command_with_output_and_env(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, env)
+    let exit_status = exec_command(input, cwd, env)?;
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
     check_exit_status(input, cwd, exit_status, None, true)?;
     Ok(())
 }
@@ -127,11 +141,7 @@ pub fn run_command_with_output_and_env_no_err(
     cwd: Option<&Path>,
     env: Option<&HashMap<String, String>>,
 ) -> Result<(), String> {
-    let exit_status = get_command_inner(input, cwd, env)
+    let exit_status = exec_command(input, cwd, env)?;
-        .spawn()
-        .map_err(|e| command_error(input, &cwd, e))?
-        .wait()
-        .map_err(|e| command_error(input, &cwd, e))?;
     check_exit_status(input, cwd, exit_status, None, false)?;
     Ok(())
 }
@@ -164,10 +174,7 @@ pub fn cargo_install(to_install: &str) -> Result<(), String> {
 
 pub fn get_os_name() -> Result<String, String> {
     let output = run_command(&[&"uname"], None)?;
-    let name = std::str::from_utf8(&output.stdout)
+    let name = std::str::from_utf8(&output.stdout).unwrap_or("").trim().to_string();
-        .unwrap_or("")
-        .trim()
-        .to_string();
     if !name.is_empty() {
         Ok(name)
     } else {
@@ -274,11 +281,7 @@ fn git_clone_inner(
         command.push(&"1");
     }
     run_command_with_output(&command, None)?;
-    Ok(CloneResult {
+    Ok(CloneResult { ran_clone: true, repo_name, repo_dir: dest.display().to_string() })
-        ran_clone: true,
-        repo_name,
-        repo_dir: dest.display().to_string(),
-    })
 }
 
 fn get_repo_name(url: &str) -> String {
@@ -307,6 +310,25 @@ pub fn git_clone(
     git_clone_inner(to_clone, dest, shallow_clone, repo_name)
 }
 
+pub fn create_dir<P: AsRef<Path>>(path: P) -> Result<(), String> {
+    fs::create_dir_all(&path).map_err(|error| {
+        format!("Failed to create directory `{}`: {:?}", path.as_ref().display(), error)
+    })
+}
+
+pub fn copy_file<F: AsRef<Path>, T: AsRef<Path>>(from: F, to: T) -> Result<(), String> {
+    fs::copy(&from, &to)
+        .map_err(|error| {
+            format!(
+                "Failed to copy file `{}` into `{}`: {:?}",
+                from.as_ref().display(),
+                to.as_ref().display(),
+                error
+            )
+        })
+        .map(|_| ())
+}
+
 /// This function differs from `git_clone` in how it handles *where* the repository will be cloned.
 /// In `git_clone`, it is cloned in the provided path. In this function, the path you provide is
 /// the parent folder. So if you pass "a" as folder and try to clone "b.git", it will be cloned into
@@ -318,15 +340,15 @@ pub fn git_clone_root_dir(
 ) -> Result<CloneResult, String> {
     let repo_name = get_repo_name(to_clone);
 
-    git_clone_inner(
+    git_clone_inner(to_clone, &dest_parent_dir.join(&repo_name), shallow_clone, repo_name)
-        to_clone,
-        &dest_parent_dir.join(&repo_name),
-        shallow_clone,
-        repo_name,
-    )
 }
 
-pub fn walk_dir<P, D, F>(dir: P, mut dir_cb: D, mut file_cb: F) -> Result<(), String>
+pub fn walk_dir<P, D, F>(
+    dir: P,
+    dir_cb: &mut D,
+    file_cb: &mut F,
+    recursive: bool,
+) -> Result<(), String>
 where
     P: AsRef<Path>,
     D: FnMut(&Path) -> Result<(), String>,
@@ -341,6 +363,9 @@ where
         let entry_path = entry.path();
         if entry_path.is_dir() {
             dir_cb(&entry_path)?;
+            if recursive {
+                walk_dir(entry_path, dir_cb, file_cb, recursive)?; // Recursive call
+            }
         } else {
             file_cb(&entry_path)?;
         }
@@ -383,11 +408,7 @@ pub fn split_args(args: &str) -> Result<Vec<String>, String> {
                 }
             }
             if !found_end {
-                return Err(format!(
+                return Err(format!("Didn't find `{}` at the end of `{}`", end, &args[start..]));
-                    "Didn't find `{}` at the end of `{}`",
-                    end,
-                    &args[start..]
-                ));
             }
         } else if c == '\\' {
             // We skip the escaped character.
@@ -403,11 +424,7 @@ pub fn split_args(args: &str) -> Result<Vec<String>, String> {
 
 pub fn remove_file<P: AsRef<Path> + ?Sized>(file_path: &P) -> Result<(), String> {
     std::fs::remove_file(file_path).map_err(|error| {
-        format!(
+        format!("Failed to remove `{}`: {:?}", file_path.as_ref().display(), error)
-            "Failed to remove `{}`: {:?}",
-            file_path.as_ref().display(),
-            error
-        )
     })
 }
 
@@ -427,6 +444,10 @@ pub fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) -> R
     })
 }
 
+pub fn get_sysroot_dir() -> PathBuf {
+    Path::new(crate::BUILD_DIR).join("build_sysroot")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

compiler/rustc_codegen_gcc/config.example.toml

@@ -1,2 +1,2 @@
-gcc-path = "gcc-build/gcc"
+#gcc-path = "gcc-build/gcc"
-# download-gccjit = true
+download-gccjit = true

compiler/rustc_codegen_gcc/deps/libLLVM-18-rust-1.78.0-nightly.so

@@ -1 +0,0 @@
-INPUT(libLLVM.so.18.1-rust-1.78.0-nightly)

compiler/rustc_codegen_gcc/doc/tips.md

@@ -35,6 +35,14 @@ COLLECT_NO_DEMANGLE=1
  * Build the stage2 compiler (`rustup toolchain link debug-current build/x86_64-unknown-linux-gnu/stage2`).
  * Clean and rebuild the codegen with `debug-current` in the file `rust-toolchain`.
 
+### How to use a custom sysroot source path
+
+If you wish to build a custom sysroot, pass the path of your sysroot source to `--sysroot-source` during the `prepare` step, like so:
+
+```
+./y.sh prepare --sysroot-source /path/to/custom/source
+```
+
 ### How to use [mem-trace](https://github.com/antoyo/mem-trace)
 
 `rustc` needs to be built without `jemalloc` so that `mem-trace` can overload `malloc` since `jemalloc` is linked statically, so a `LD_PRELOAD`-ed library won't a chance to intercept the calls to `malloc`.
@@ -54,13 +62,13 @@ generate it in [gimple.md](./doc/gimple.md).
 
  * Run `./y.sh prepare --cross` so that the sysroot is patched for the cross-compiling case.
  * Set the path to the cross-compiling libgccjit in `gcc-path` (in `config.toml`).
- * Make sure you have the linker for your target (for instance `m68k-unknown-linux-gnu-gcc`) in your `$PATH`. Currently, the linker name is hardcoded as being `$TARGET-gcc`. Specify the target when building the sysroot: `./y.sh build --target-triple m68k-unknown-linux-gnu`.
+ * Make sure you have the linker for your target (for instance `m68k-unknown-linux-gnu-gcc`) in your `$PATH`. Currently, the linker name is hardcoded as being `$TARGET-gcc`. Specify the target when building the sysroot: `./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu`.
  * Build your project by specifying the target: `OVERWRITE_TARGET_TRIPLE=m68k-unknown-linux-gnu ../y.sh cargo build --target m68k-unknown-linux-gnu`.
 
 If the target is not yet supported by the Rust compiler, create a [target specification file](https://docs.rust-embedded.org/embedonomicon/custom-target.html) (note that the `arch` specified in this file must be supported by the rust compiler).
 Then, you can use it the following way:
 
- * Add the target specification file using `--target` as an **absolute** path to build the sysroot: `./y.sh build --target-triple m68k-unknown-linux-gnu --target $(pwd)/m68k-unknown-linux-gnu.json`
+ * Add the target specification file using `--target` as an **absolute** path to build the sysroot: `./y.sh build --sysroot --target-triple m68k-unknown-linux-gnu --target $(pwd)/m68k-unknown-linux-gnu.json`
  * Build your project by specifying the target specification file: `OVERWRITE_TARGET_TRIPLE=m68k-unknown-linux-gnu ../y.sh cargo build --target path/to/m68k-unknown-linux-gnu.json`.
 
 If you get the following error:

compiler/rustc_codegen_gcc/example/example.rs

@@ -153,10 +153,9 @@ fn array_as_slice(arr: &[u8; 3]) -> &[u8] {
     arr
 }
 
-// FIXME: fix the intrinsic implementation to work with the new ->u32 signature
+unsafe fn use_ctlz_nonzero(a: u16) -> u32 {
-// unsafe fn use_ctlz_nonzero(a: u16) -> u32 {
+    intrinsics::ctlz_nonzero(a)
-//     intrinsics::ctlz_nonzero(a)
+}
-// }
 
 fn ptr_as_usize(ptr: *const u8) -> usize {
     ptr as usize

compiler/rustc_codegen_gcc/libgccjit.version

@@ -1 +1 @@
-b6f163f52
+341be3b7d7ac6976cfed8ed59da3573c040d0776

compiler/rustc_codegen_gcc/patches/0001-Add-stdarch-Cargo.toml-for-testing.patch

@@ -19,7 +19,7 @@ index 0000000..4c63700
 +members = [
 +  "crates/core_arch",
 +  "crates/std_detect",
-+  "crates/stdarch-gen",
++  "crates/stdarch-gen-arm",
 +  #"examples/"
 +]
 +exclude = [

compiler/rustc_codegen_gcc/patches/0022-core-Disable-not-compiling-tests.patch

@@ -39,4 +39,4 @@ index 42a26ae..5ac1042 100644
 +#![cfg(test)]
  #![feature(alloc_layout_extra)]
  #![feature(array_chunks)]
- #![feature(array_windows)]
+ #![feature(array_ptr_get)]

compiler/rustc_codegen_gcc/patches/libgccjit12/0001-core-Disable-portable-simd-test.patch

@@ -1,4 +1,4 @@
-From a5663265f797a43c502915c356fe7899c16cee92 Mon Sep 17 00:00:00 2001
+From 124a11ce086952a5794d5cfbaa45175809497b81 Mon Sep 17 00:00:00 2001
 From: None <none@example.com>
 Date: Sat, 18 Nov 2023 10:50:36 -0500
 Subject: [PATCH] [core] Disable portable-simd test
@@ -8,18 +8,18 @@ Subject: [PATCH] [core] Disable portable-simd test
  1 file changed, 2 deletions(-)
 
 diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
-index d0a119c..76fdece 100644
+index b71786c..cf484d5 100644
 --- a/library/core/tests/lib.rs
 +++ b/library/core/tests/lib.rs
-@@ -89,7 +89,6 @@
+@@ -95,7 +95,6 @@
  #![feature(never_type)]
  #![feature(unwrap_infallible)]
  #![feature(pointer_is_aligned_to)]
 -#![feature(portable_simd)]
  #![feature(ptr_metadata)]
- #![feature(lazy_cell)]
  #![feature(unsized_tuple_coercion)]
-@@ -155,7 +154,6 @@ mod pin;
+ #![feature(const_option)]
+@@ -157,7 +156,6 @@ mod pin;
  mod pin_macro;
  mod ptr;
  mod result;
@@ -28,5 +28,4 @@ index d0a119c..76fdece 100644
  mod str;
  mod str_lossy;
 -- 
-2.42.1
+2.45.2
-

compiler/rustc_codegen_gcc/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-03-05"
+channel = "nightly-2024-07-02"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]

compiler/rustc_codegen_gcc/src/abi.rs

@@ -4,6 +4,7 @@ use gccjit::{ToLValue, ToRValue, Type};
 use rustc_codegen_ssa::traits::{AbiBuilderMethods, BaseTypeMethods};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::bug;
+use rustc_middle::ty::layout::LayoutOf;
 use rustc_middle::ty::Ty;
 #[cfg(feature = "master")]
 use rustc_session::config;
@@ -184,9 +185,17 @@ impl<'gcc, 'tcx> FnAbiGccExt<'gcc, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
                 }
                 PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack } => {
                     assert!(!on_stack);
-                    let ty =
+                    // Construct the type of a (wide) pointer to `ty`, and pass its two fields.
-                        apply_attrs(cx.type_ptr_to(arg.memory_ty(cx)), &attrs, argument_tys.len());
+                    // Any two ABI-compatible unsized types have the same metadata type and
-                    apply_attrs(ty, &meta_attrs, argument_tys.len())
+                    // moreover the same metadata value leads to the same dynamic size and
+                    // alignment, so this respects ABI compatibility.
+                    let ptr_ty = Ty::new_mut_ptr(cx.tcx, arg.layout.ty);
+                    let ptr_layout = cx.layout_of(ptr_ty);
+                    let typ1 = ptr_layout.scalar_pair_element_gcc_type(cx, 0);
+                    let typ2 = ptr_layout.scalar_pair_element_gcc_type(cx, 1);
+                    argument_tys.push(apply_attrs(typ1, &attrs, argument_tys.len()));
+                    argument_tys.push(apply_attrs(typ2, &meta_attrs, argument_tys.len()));
+                    continue;
                 }
             };
             argument_tys.push(arg_ty);

compiler/rustc_codegen_gcc/src/asm.rs

@@ -115,7 +115,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         span: &[Span],
         instance: Instance<'_>,
         dest: Option<Self::BasicBlock>,
-        _catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
+        _dest_catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
     ) {
         if options.contains(InlineAsmOptions::MAY_UNWIND) {
             self.sess().dcx().create_err(UnwindingInlineAsm { span: span[0] }).emit();
@@ -485,9 +485,8 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                         }
 
                         InlineAsmOperandRef::Label { label } => {
-                            let label_gcc_index = labels.iter()
+                            let label_gcc_index =
-                                .position(|&l| l == label)
+                                labels.iter().position(|&l| l == label).expect("wrong rust index");
-                                .expect("wrong rust index");
                             let gcc_index = label_gcc_index + outputs.len() + inputs.len();
                             push_to_template(Some('l'), gcc_index);
                         }
@@ -538,9 +537,8 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         }
         if dest.is_none() && options.contains(InlineAsmOptions::NORETURN) {
             let builtin_unreachable = self.context.get_builtin_function("__builtin_unreachable");
-            let builtin_unreachable: RValue<'gcc> = unsafe {
+            let builtin_unreachable: RValue<'gcc> =
-                std::mem::transmute(builtin_unreachable)
+                unsafe { std::mem::transmute(builtin_unreachable) };
-            };
             self.call(self.type_void(), None, None, builtin_unreachable, &[], None, None);
         }
 
@@ -696,10 +694,12 @@ fn reg_to_gcc(reg: InlineAsmRegOrRegClass) -> ConstraintOrRegister {
 fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegClass) -> Type<'gcc> {
     match reg {
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::preg) => unimplemented!(),
         InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg)
         | InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::vreg_low16) => {
-            unimplemented!()
+            cx.type_vector(cx.type_i64(), 2)
+        }
+        InlineAsmRegClass::AArch64(AArch64InlineAsmRegClass::preg) => {
+            unreachable!("clobber-only")
         }
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::sreg)
@@ -710,21 +710,13 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg)
         | InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg_low8)
         | InlineAsmRegClass::Arm(ArmInlineAsmRegClass::qreg_low4) => {
-            unimplemented!()
+            cx.type_vector(cx.type_i64(), 2)
         }
-        InlineAsmRegClass::Avr(_) => unimplemented!(),
-        InlineAsmRegClass::Bpf(_) => unimplemented!(),
         InlineAsmRegClass::Hexagon(HexagonInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::LoongArch(LoongArchInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::LoongArch(LoongArchInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_addr) => cx.type_i32(),
-        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_data) => cx.type_i32(),
-        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::reg) => cx.type_i32(),
-        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::freg) => cx.type_f32(),
         InlineAsmRegClass::Mips(MipsInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::Mips(MipsInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::Msp430(_) => unimplemented!(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg16) => cx.type_i16(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg32) => cx.type_i32(),
         InlineAsmRegClass::Nvptx(NvptxInlineAsmRegClass::reg64) => cx.type_i64(),
@@ -737,26 +729,43 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => cx.type_i32(),
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::freg) => cx.type_f32(),
-        InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::vreg) => cx.type_f32(),
+        InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::vreg) => {
+            unreachable!("clobber-only")
+        }
         InlineAsmRegClass::X86(X86InlineAsmRegClass::reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::reg_abcd) => cx.type_i32(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::reg_byte) => cx.type_i8(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::mmx_reg) => unimplemented!(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::xmm_reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::ymm_reg)
         | InlineAsmRegClass::X86(X86InlineAsmRegClass::zmm_reg) => cx.type_f32(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg) => unimplemented!(),
         InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg) => cx.type_i16(),
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0) => cx.type_i16(),
+        InlineAsmRegClass::X86(X86InlineAsmRegClass::x87_reg)
-        InlineAsmRegClass::X86(X86InlineAsmRegClass::tmm_reg) => unimplemented!(),
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::mmx_reg)
-        InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::kreg0)
-        InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
+        | InlineAsmRegClass::X86(X86InlineAsmRegClass::tmm_reg) => {
-            bug!("LLVM backend does not support SPIR-V")
+            unreachable!("clobber-only")
         }
+        InlineAsmRegClass::Wasm(WasmInlineAsmRegClass::local) => cx.type_i32(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::reg) => cx.type_i64(),
+        InlineAsmRegClass::Bpf(BpfInlineAsmRegClass::wreg) => cx.type_i32(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg) => cx.type_i8(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_upper) => cx.type_i8(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_pair) => cx.type_i16(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_iw) => cx.type_i16(),
+        InlineAsmRegClass::Avr(AvrInlineAsmRegClass::reg_ptr) => cx.type_i16(),
         InlineAsmRegClass::S390x(
             S390xInlineAsmRegClass::reg | S390xInlineAsmRegClass::reg_addr,
         ) => cx.type_i32(),
         InlineAsmRegClass::S390x(S390xInlineAsmRegClass::freg) => cx.type_f64(),
+        InlineAsmRegClass::Msp430(Msp430InlineAsmRegClass::reg) => cx.type_i16(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg) => cx.type_i32(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_addr) => cx.type_i32(),
+        InlineAsmRegClass::M68k(M68kInlineAsmRegClass::reg_data) => cx.type_i32(),
+        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::reg) => cx.type_i32(),
+        InlineAsmRegClass::CSKY(CSKYInlineAsmRegClass::freg) => cx.type_f32(),
+        InlineAsmRegClass::SpirV(SpirVInlineAsmRegClass::reg) => {
+            bug!("GCC backend does not support SPIR-V")
+        }
         InlineAsmRegClass::Err => unreachable!(),
     }
 }

compiler/rustc_codegen_gcc/src/attributes.rs

@@ -92,7 +92,7 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
     let mut function_features = function_features
         .iter()
         .flat_map(|feat| to_gcc_features(cx.tcx.sess, feat).into_iter())
-        .chain(codegen_fn_attrs.instruction_set.iter().map(|x| match x {
+        .chain(codegen_fn_attrs.instruction_set.iter().map(|x| match *x {
             InstructionSetAttr::ArmA32 => "-thumb-mode", // TODO(antoyo): support removing feature.
             InstructionSetAttr::ArmT32 => "thumb-mode",
         }))
@@ -118,8 +118,8 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
 
             if feature.starts_with('-') {
                 Some(format!("no{}", feature))
-            } else if feature.starts_with('+') {
+            } else if let Some(stripped) = feature.strip_prefix('+') {
-                Some(feature[1..].to_string())
+                Some(stripped.to_string())
             } else {
                 Some(feature.to_string())
             }
@@ -128,6 +128,12 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
         .join(",");
     if !target_features.is_empty() {
         #[cfg(feature = "master")]
-        func.add_attribute(FnAttribute::Target(&target_features));
+        match cx.sess().target.arch.as_ref() {
+            "x86" | "x86_64" | "powerpc" => {
+                func.add_attribute(FnAttribute::Target(&target_features))
+            }
+            // The target attribute is not supported on other targets in GCC.
+            _ => (),
+        }
     }
 }

compiler/rustc_codegen_gcc/src/back/lto.rs

@@ -16,13 +16,14 @@
 // /usr/bin/ld: warning: type of symbol `_RNvNvNvNtCs5JWOrf9uCus_5rayon11thread_pool19WORKER_THREAD_STATE7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o
 // /usr/bin/ld: warning: type of symbol `_RNvNvNvNvNtNtNtCsAj5i4SGTR7_3std4sync4mpmc5waker17current_thread_id5DUMMY7___getit5___KEY' changed from 1 to 6 in /tmp/ccKeUSiR.ltrans0.ltrans.o
 // /usr/bin/ld: warning: incremental linking of LTO and non-LTO objects; using -flinker-output=nolto-rel which will bypass whole program optimization
-use std::ffi::CString;
+use std::ffi::{CStr, CString};
 use std::fs::{self, File};
 use std::path::{Path, PathBuf};
+use std::sync::Arc;
 
-use gccjit::OutputKind;
+use gccjit::{Context, OutputKind};
 use object::read::archive::ArchiveFile;
-use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule};
+use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule, ThinShared};
 use rustc_codegen_ssa::back::symbol_export;
 use rustc_codegen_ssa::back::write::{CodegenContext, FatLtoInput};
 use rustc_codegen_ssa::traits::*;
@@ -30,6 +31,7 @@ use rustc_codegen_ssa::{looks_like_rust_object_file, ModuleCodegen, ModuleKind};
 use rustc_data_structures::memmap::Mmap;
 use rustc_errors::{DiagCtxtHandle, FatalError};
 use rustc_hir::def_id::LOCAL_CRATE;
+use rustc_middle::bug;
 use rustc_middle::dep_graph::WorkProduct;
 use rustc_middle::middle::exported_symbols::{SymbolExportInfo, SymbolExportLevel};
 use rustc_session::config::{CrateType, Lto};
@@ -37,7 +39,7 @@ use tempfile::{tempdir, TempDir};
 
 use crate::back::write::save_temp_bitcode;
 use crate::errors::{DynamicLinkingWithLTO, LtoBitcodeFromRlib, LtoDisallowed, LtoDylib};
-use crate::{to_gcc_opt_level, GccCodegenBackend, GccContext};
+use crate::{to_gcc_opt_level, GccCodegenBackend, GccContext, SyncContext};
 
 /// We keep track of the computed LTO cache keys from the previous
 /// session to determine which CGUs we can reuse.
@@ -128,8 +130,7 @@ fn prepare_lto(
             }
 
             let archive_data = unsafe {
-                Mmap::map(File::open(&path).expect("couldn't open rlib"))
+                Mmap::map(File::open(path).expect("couldn't open rlib")).expect("couldn't map rlib")
-                    .expect("couldn't map rlib")
             };
             let archive = ArchiveFile::parse(&*archive_data).expect("wanted an rlib");
             let obj_files = archive
@@ -349,6 +350,395 @@ impl ModuleBuffer {
 
 impl ModuleBufferMethods for ModuleBuffer {
     fn data(&self) -> &[u8] {
-        unimplemented!("data not needed for GCC codegen");
+        &[]
     }
 }
+
+/// Performs thin LTO by performing necessary global analysis and returning two
+/// lists, one of the modules that need optimization and another for modules that
+/// can simply be copied over from the incr. comp. cache.
+pub(crate) fn run_thin(
+    cgcx: &CodegenContext<GccCodegenBackend>,
+    modules: Vec<(String, ThinBuffer)>,
+    cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
+) -> Result<(Vec<LtoModuleCodegen<GccCodegenBackend>>, Vec<WorkProduct>), FatalError> {
+    let dcx = cgcx.create_dcx();
+    let dcx = dcx.handle();
+    let lto_data = prepare_lto(cgcx, dcx)?;
+    /*let symbols_below_threshold =
+    symbols_below_threshold.iter().map(|c| c.as_ptr()).collect::<Vec<_>>();*/
+    if cgcx.opts.cg.linker_plugin_lto.enabled() {
+        unreachable!(
+            "We should never reach this case if the LTO step \
+                      is deferred to the linker"
+        );
+    }
+    thin_lto(
+        cgcx,
+        dcx,
+        modules,
+        lto_data.upstream_modules,
+        lto_data.tmp_path,
+        cached_modules, /*, &symbols_below_threshold*/
+    )
+}
+
+pub(crate) fn prepare_thin(
+    module: ModuleCodegen<GccContext>,
+    _emit_summary: bool,
+) -> (String, ThinBuffer) {
+    let name = module.name;
+    //let buffer = ThinBuffer::new(module.module_llvm.context, true, emit_summary);
+    let buffer = ThinBuffer::new(&module.module_llvm.context);
+    (name, buffer)
+}
+
+/// Prepare "thin" LTO to get run on these modules.
+///
+/// The general structure of ThinLTO is quite different from the structure of
+/// "fat" LTO above. With "fat" LTO all LLVM modules in question are merged into
+/// one giant LLVM module, and then we run more optimization passes over this
+/// big module after internalizing most symbols. Thin LTO, on the other hand,
+/// avoid this large bottleneck through more targeted optimization.
+///
+/// At a high level Thin LTO looks like:
+///
+///    1. Prepare a "summary" of each LLVM module in question which describes
+///       the values inside, cost of the values, etc.
+///    2. Merge the summaries of all modules in question into one "index"
+///    3. Perform some global analysis on this index
+///    4. For each module, use the index and analysis calculated previously to
+///       perform local transformations on the module, for example inlining
+///       small functions from other modules.
+///    5. Run thin-specific optimization passes over each module, and then code
+///       generate everything at the end.
+///
+/// The summary for each module is intended to be quite cheap, and the global
+/// index is relatively quite cheap to create as well. As a result, the goal of
+/// ThinLTO is to reduce the bottleneck on LTO and enable LTO to be used in more
+/// situations. For example one cheap optimization is that we can parallelize
+/// all codegen modules, easily making use of all the cores on a machine.
+///
+/// With all that in mind, the function here is designed at specifically just
+/// calculating the *index* for ThinLTO. This index will then be shared amongst
+/// all of the `LtoModuleCodegen` units returned below and destroyed once
+/// they all go out of scope.
+fn thin_lto(
+    cgcx: &CodegenContext<GccCodegenBackend>,
+    _dcx: DiagCtxtHandle<'_>,
+    modules: Vec<(String, ThinBuffer)>,
+    serialized_modules: Vec<(SerializedModule<ModuleBuffer>, CString)>,
+    tmp_path: TempDir,
+    cached_modules: Vec<(SerializedModule<ModuleBuffer>, WorkProduct)>,
+    //symbols_below_threshold: &[*const libc::c_char],
+) -> Result<(Vec<LtoModuleCodegen<GccCodegenBackend>>, Vec<WorkProduct>), FatalError> {
+    let _timer = cgcx.prof.generic_activity("LLVM_thin_lto_global_analysis");
+    info!("going for that thin, thin LTO");
+
+    /*let green_modules: FxHashMap<_, _> =
+    cached_modules.iter().map(|(_, wp)| (wp.cgu_name.clone(), wp.clone())).collect();*/
+
+    let full_scope_len = modules.len() + serialized_modules.len() + cached_modules.len();
+    let mut thin_buffers = Vec::with_capacity(modules.len());
+    let mut module_names = Vec::with_capacity(full_scope_len);
+    //let mut thin_modules = Vec::with_capacity(full_scope_len);
+
+    for (i, (name, buffer)) in modules.into_iter().enumerate() {
+        info!("local module: {} - {}", i, name);
+        let cname = CString::new(name.as_bytes()).unwrap();
+        /*thin_modules.push(llvm::ThinLTOModule {
+            identifier: cname.as_ptr(),
+            data: buffer.data().as_ptr(),
+            len: buffer.data().len(),
+        });*/
+        thin_buffers.push(buffer);
+        module_names.push(cname);
+    }
+
+    // FIXME: All upstream crates are deserialized internally in the
+    //        function below to extract their summary and modules. Note that
+    //        unlike the loop above we *must* decode and/or read something
+    //        here as these are all just serialized files on disk. An
+    //        improvement, however, to make here would be to store the
+    //        module summary separately from the actual module itself. Right
+    //        now this is store in one large bitcode file, and the entire
+    //        file is deflate-compressed. We could try to bypass some of the
+    //        decompression by storing the index uncompressed and only
+    //        lazily decompressing the bytecode if necessary.
+    //
+    //        Note that truly taking advantage of this optimization will
+    //        likely be further down the road. We'd have to implement
+    //        incremental ThinLTO first where we could actually avoid
+    //        looking at upstream modules entirely sometimes (the contents,
+    //        we must always unconditionally look at the index).
+    let mut serialized = Vec::with_capacity(serialized_modules.len() + cached_modules.len());
+
+    let cached_modules =
+        cached_modules.into_iter().map(|(sm, wp)| (sm, CString::new(wp.cgu_name).unwrap()));
+
+    for (module, name) in serialized_modules.into_iter().chain(cached_modules) {
+        info!("upstream or cached module {:?}", name);
+        /*thin_modules.push(llvm::ThinLTOModule {
+            identifier: name.as_ptr(),
+            data: module.data().as_ptr(),
+            len: module.data().len(),
+        });*/
+
+        match module {
+            SerializedModule::Local(_) => {
+                //let path = module_buffer.0.to_str().expect("path");
+                //let my_path = PathBuf::from(path);
+                //let exists = my_path.exists();
+                /*module.module_llvm.should_combine_object_files = true;
+                module
+                .module_llvm
+                .context
+                .add_driver_option(module_buffer.0.to_str().expect("path"));*/
+            }
+            SerializedModule::FromRlib(_) => unimplemented!("from rlib"),
+            SerializedModule::FromUncompressedFile(_) => {
+                unimplemented!("from uncompressed file")
+            }
+        }
+
+        serialized.push(module);
+        module_names.push(name);
+    }
+
+    // Sanity check
+    //assert_eq!(thin_modules.len(), module_names.len());
+
+    // Delegate to the C++ bindings to create some data here. Once this is a
+    // tried-and-true interface we may wish to try to upstream some of this
+    // to LLVM itself, right now we reimplement a lot of what they do
+    // upstream...
+    /*let data = llvm::LLVMRustCreateThinLTOData(
+        thin_modules.as_ptr(),
+        thin_modules.len() as u32,
+        symbols_below_threshold.as_ptr(),
+        symbols_below_threshold.len() as u32,
+    )
+    .ok_or_else(|| write::llvm_err(dcx, LlvmError::PrepareThinLtoContext))?;
+    */
+
+    let data = ThinData; //(Arc::new(tmp_path))/*(data)*/;
+
+    info!("thin LTO data created");
+
+    /*let (key_map_path, prev_key_map, curr_key_map) =
+        if let Some(ref incr_comp_session_dir) = cgcx.incr_comp_session_dir {
+            let path = incr_comp_session_dir.join(THIN_LTO_KEYS_INCR_COMP_FILE_NAME);
+            // If the previous file was deleted, or we get an IO error
+            // reading the file, then we'll just use `None` as the
+            // prev_key_map, which will force the code to be recompiled.
+            let prev =
+                if path.exists() { ThinLTOKeysMap::load_from_file(&path).ok() } else { None };
+            let curr = ThinLTOKeysMap::from_thin_lto_modules(&data, &thin_modules, &module_names);
+            (Some(path), prev, curr)
+        }
+        else {
+            // If we don't compile incrementally, we don't need to load the
+            // import data from LLVM.
+            assert!(green_modules.is_empty());
+            let curr = ThinLTOKeysMap::default();
+            (None, None, curr)
+        };
+    info!("thin LTO cache key map loaded");
+    info!("prev_key_map: {:#?}", prev_key_map);
+    info!("curr_key_map: {:#?}", curr_key_map);*/
+
+    // Throw our data in an `Arc` as we'll be sharing it across threads. We
+    // also put all memory referenced by the C++ data (buffers, ids, etc)
+    // into the arc as well. After this we'll create a thin module
+    // codegen per module in this data.
+    let shared =
+        Arc::new(ThinShared { data, thin_buffers, serialized_modules: serialized, module_names });
+
+    let copy_jobs = vec![];
+    let mut opt_jobs = vec![];
+
+    info!("checking which modules can be-reused and which have to be re-optimized.");
+    for (module_index, module_name) in shared.module_names.iter().enumerate() {
+        let module_name = module_name_to_str(module_name);
+        /*if let (Some(prev_key_map), true) =
+            (prev_key_map.as_ref(), green_modules.contains_key(module_name))
+        {
+            assert!(cgcx.incr_comp_session_dir.is_some());
+
+            // If a module exists in both the current and the previous session,
+            // and has the same LTO cache key in both sessions, then we can re-use it
+            if prev_key_map.keys.get(module_name) == curr_key_map.keys.get(module_name) {
+                let work_product = green_modules[module_name].clone();
+                copy_jobs.push(work_product);
+                info!(" - {}: re-used", module_name);
+                assert!(cgcx.incr_comp_session_dir.is_some());
+                continue;
+            }
+        }*/
+
+        info!(" - {}: re-compiled", module_name);
+        opt_jobs
+            .push(LtoModuleCodegen::Thin(ThinModule { shared: shared.clone(), idx: module_index }));
+    }
+
+    // Save the current ThinLTO import information for the next compilation
+    // session, overwriting the previous serialized data (if any).
+    /*if let Some(path) = key_map_path {
+        if let Err(err) = curr_key_map.save_to_file(&path) {
+            return Err(write::llvm_err(dcx, LlvmError::WriteThinLtoKey { err }));
+        }
+    }*/
+
+    // NOTE: save the temporary directory used by LTO so that it gets deleted after linking instead
+    // of now.
+    //module.module_llvm.temp_dir = Some(tmp_path);
+    // TODO: save the directory so that it gets deleted later.
+    std::mem::forget(tmp_path);
+
+    Ok((opt_jobs, copy_jobs))
+}
+
+pub unsafe fn optimize_thin_module(
+    thin_module: ThinModule<GccCodegenBackend>,
+    _cgcx: &CodegenContext<GccCodegenBackend>,
+) -> Result<ModuleCodegen<GccContext>, FatalError> {
+    //let dcx = cgcx.create_dcx();
+
+    //let module_name = &thin_module.shared.module_names[thin_module.idx];
+    /*let tm_factory_config = TargetMachineFactoryConfig::new(cgcx, module_name.to_str().unwrap());
+    let tm = (cgcx.tm_factory)(tm_factory_config).map_err(|e| write::llvm_err(&dcx, e))?;*/
+
+    // Right now the implementation we've got only works over serialized
+    // modules, so we create a fresh new LLVM context and parse the module
+    // into that context. One day, however, we may do this for upstream
+    // crates but for locally codegened modules we may be able to reuse
+    // that LLVM Context and Module.
+    //let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
+    //let llmod_raw = parse_module(llcx, module_name, thin_module.data(), &dcx)? as *const _;
+    let mut should_combine_object_files = false;
+    let context = match thin_module.shared.thin_buffers.get(thin_module.idx) {
+        Some(thin_buffer) => Arc::clone(&thin_buffer.context),
+        None => {
+            let context = Context::default();
+            let len = thin_module.shared.thin_buffers.len();
+            let module = &thin_module.shared.serialized_modules[thin_module.idx - len];
+            match *module {
+                SerializedModule::Local(ref module_buffer) => {
+                    let path = module_buffer.0.to_str().expect("path");
+                    context.add_driver_option(path);
+                    should_combine_object_files = true;
+                    /*module.module_llvm.should_combine_object_files = true;
+                    module
+                        .module_llvm
+                        .context
+                        .add_driver_option(module_buffer.0.to_str().expect("path"));*/
+                }
+                SerializedModule::FromRlib(_) => unimplemented!("from rlib"),
+                SerializedModule::FromUncompressedFile(_) => {
+                    unimplemented!("from uncompressed file")
+                }
+            }
+            Arc::new(SyncContext::new(context))
+        }
+    };
+    let module = ModuleCodegen {
+        module_llvm: GccContext { context, should_combine_object_files, temp_dir: None },
+        name: thin_module.name().to_string(),
+        kind: ModuleKind::Regular,
+    };
+    /*{
+        let target = &*module.module_llvm.tm;
+        let llmod = module.module_llvm.llmod();
+        save_temp_bitcode(cgcx, &module, "thin-lto-input");
+
+        // Up next comes the per-module local analyses that we do for Thin LTO.
+        // Each of these functions is basically copied from the LLVM
+        // implementation and then tailored to suit this implementation. Ideally
+        // each of these would be supported by upstream LLVM but that's perhaps
+        // a patch for another day!
+        //
+        // You can find some more comments about these functions in the LLVM
+        // bindings we've got (currently `PassWrapper.cpp`)
+        {
+            let _timer =
+                cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_rename", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTORename(thin_module.shared.data.0, llmod, target) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-rename");
+        }
+
+        {
+            let _timer = cgcx
+                .prof
+                .generic_activity_with_arg("LLVM_thin_lto_resolve_weak", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOResolveWeak(thin_module.shared.data.0, llmod) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-resolve");
+        }
+
+        {
+            let _timer = cgcx
+                .prof
+                .generic_activity_with_arg("LLVM_thin_lto_internalize", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOInternalize(thin_module.shared.data.0, llmod) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-internalize");
+        }
+
+        {
+            let _timer =
+                cgcx.prof.generic_activity_with_arg("LLVM_thin_lto_import", thin_module.name());
+            if !llvm::LLVMRustPrepareThinLTOImport(thin_module.shared.data.0, llmod, target) {
+                return Err(write::llvm_err(&dcx, LlvmError::PrepareThinLtoModule));
+            }
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-import");
+        }
+
+        // Alright now that we've done everything related to the ThinLTO
+        // analysis it's time to run some optimizations! Here we use the same
+        // `run_pass_manager` as the "fat" LTO above except that we tell it to
+        // populate a thin-specific pass manager, which presumably LLVM treats a
+        // little differently.
+        {
+            info!("running thin lto passes over {}", module.name);
+            run_pass_manager(cgcx, &dcx, &mut module, true)?;
+            save_temp_bitcode(cgcx, &module, "thin-lto-after-pm");
+        }
+    }*/
+    Ok(module)
+}
+
+pub struct ThinBuffer {
+    context: Arc<SyncContext>,
+}
+
+// TODO: check if this makes sense to make ThinBuffer Send and Sync.
+unsafe impl Send for ThinBuffer {}
+unsafe impl Sync for ThinBuffer {}
+
+impl ThinBuffer {
+    pub(crate) fn new(context: &Arc<SyncContext>) -> Self {
+        Self { context: Arc::clone(context) }
+    }
+}
+
+impl ThinBufferMethods for ThinBuffer {
+    fn data(&self) -> &[u8] {
+        &[]
+    }
+
+    fn thin_link_data(&self) -> &[u8] {
+        unimplemented!();
+    }
+}
+
+pub struct ThinData; //(Arc<TempDir>);
+
+fn module_name_to_str(c_str: &CStr) -> &str {
+    c_str.to_str().unwrap_or_else(|e| {
+        bug!("Encountered non-utf8 GCC module name `{}`: {}", c_str.to_string_lossy(), e)
+    })
+}

compiler/rustc_codegen_gcc/src/back/write.rs

@@ -31,6 +31,7 @@ pub(crate) unsafe fn codegen(
 
         // NOTE: Only generate object files with GIMPLE when this environment variable is set for
         // now because this requires a particular setup (same gcc/lto1/lto-wrapper commit as libgccjit).
+        // TODO: remove this environment variable.
         let fat_lto = env::var("EMBED_LTO_BITCODE").as_deref() == Ok("1");
 
         let bc_out = cgcx.output_filenames.temp_path(OutputType::Bitcode, module_name);
@@ -56,6 +57,8 @@ pub(crate) unsafe fn codegen(
                     .generic_activity_with_arg("GCC_module_codegen_emit_bitcode", &*module.name);
                 context.add_command_line_option("-flto=auto");
                 context.add_command_line_option("-flto-partition=one");
+                // TODO: remove since we don't want fat objects when it is for Bitcode only.
+                context.add_command_line_option("-ffat-lto-objects");
                 context
                     .compile_to_file(OutputKind::ObjectFile, bc_out.to_str().expect("path to str"));
             }
@@ -104,7 +107,7 @@ pub(crate) unsafe fn codegen(
                     // FIXME(antoyo): segfault in dump_reproducer_to_file() might be caused by
                     // transmuting an rvalue to an lvalue.
                     // Segfault is actually in gcc::jit::reproducer::get_identifier_as_lvalue
-                    context.dump_reproducer_to_file(&format!("/tmp/reproducers/{}.c", module.name));
+                    context.dump_reproducer_to_file(format!("/tmp/reproducers/{}.c", module.name));
                     println!("Dumped reproducer {}", module.name);
                 }
                 if env::var("CG_GCCJIT_DUMP_TO_FILE").as_deref() == Ok("1") {
@@ -113,17 +116,20 @@ pub(crate) unsafe fn codegen(
                     context.set_debug_info(true);
                     context.dump_to_file(path, true);
                 }
-                if should_combine_object_files && fat_lto {
+                if should_combine_object_files {
-                    context.add_command_line_option("-flto=auto");
+                    if fat_lto {
-                    context.add_command_line_option("-flto-partition=one");
+                        context.add_command_line_option("-flto=auto");
+                        context.add_command_line_option("-flto-partition=one");
+
+                        // NOTE: without -fuse-linker-plugin, we get the following error:
+                        // lto1: internal compiler error: decompressed stream: Destination buffer is too small
+                        context.add_driver_option("-fuse-linker-plugin");
+                    }
 
                     context.add_driver_option("-Wl,-r");
                     // NOTE: we need -nostdlib, otherwise, we get the following error:
                     // /usr/bin/ld: cannot find -lgcc_s: No such file or directory
                     context.add_driver_option("-nostdlib");
-                    // NOTE: without -fuse-linker-plugin, we get the following error:
-                    // lto1: internal compiler error: decompressed stream: Destination buffer is too small
-                    context.add_driver_option("-fuse-linker-plugin");
 
                     // NOTE: this doesn't actually generate an executable. With the above flags, it combines the .o files together in another .o.
                     context.compile_to_file(

compiler/rustc_codegen_gcc/src/base.rs

@@ -1,8 +1,9 @@
 use std::collections::HashSet;
 use std::env;
+use std::sync::Arc;
 use std::time::Instant;
 
-use gccjit::{FunctionType, GlobalKind};
+use gccjit::{CType, FunctionType, GlobalKind};
 use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
 use rustc_codegen_ssa::mono_item::MonoItemExt;
 use rustc_codegen_ssa::traits::DebugInfoMethods;
@@ -18,8 +19,8 @@ use rustc_target::spec::PanicStrategy;
 
 use crate::builder::Builder;
 use crate::context::CodegenCx;
-use crate::GccContext;
 use crate::{gcc_util, new_context, LockedTargetInfo};
+use crate::{GccContext, SyncContext};
 
 #[cfg(feature = "master")]
 pub fn visibility_to_gcc(linkage: Visibility) -> gccjit::Visibility {
@@ -135,7 +136,7 @@ pub fn compile_codegen_unit(
 
         let target_cpu = gcc_util::target_cpu(tcx.sess);
         if target_cpu != "generic" {
-            context.add_command_line_option(&format!("-march={}", target_cpu));
+            context.add_command_line_option(format!("-march={}", target_cpu));
         }
 
         if tcx
@@ -181,7 +182,24 @@ pub fn compile_codegen_unit(
         context.set_allow_unreachable_blocks(true);
 
         {
-            let cx = CodegenCx::new(&context, cgu, tcx, target_info.supports_128bit_int());
+            // TODO: to make it less error-prone (calling get_target_info() will add the flag
+            // -fsyntax-only), forbid the compilation when get_target_info() is called on a
+            // context.
+            let f16_type_supported = target_info.supports_target_dependent_type(CType::Float16);
+            let f32_type_supported = target_info.supports_target_dependent_type(CType::Float32);
+            let f64_type_supported = target_info.supports_target_dependent_type(CType::Float64);
+            let f128_type_supported = target_info.supports_target_dependent_type(CType::Float128);
+            // TODO: improve this to avoid passing that many arguments.
+            let cx = CodegenCx::new(
+                &context,
+                cgu,
+                tcx,
+                target_info.supports_128bit_int(),
+                f16_type_supported,
+                f32_type_supported,
+                f64_type_supported,
+                f128_type_supported,
+            );
 
             let mono_items = cgu.items_in_deterministic_order(tcx);
             for &(mono_item, data) in &mono_items {
@@ -205,7 +223,11 @@ pub fn compile_codegen_unit(
 
         ModuleCodegen {
             name: cgu_name.to_string(),
-            module_llvm: GccContext { context, should_combine_object_files: false, temp_dir: None },
+            module_llvm: GccContext {
+                context: Arc::new(SyncContext::new(context)),
+                should_combine_object_files: false,
+                temp_dir: None,
+            },
             kind: ModuleKind::Regular,
         }
     }

compiler/rustc_codegen_gcc/src/builder.rs

@@ -25,7 +25,7 @@ use rustc_middle::ty::layout::{
     FnAbiError, FnAbiOfHelpers, FnAbiRequest, HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers,
     TyAndLayout,
 };
-use rustc_middle::ty::{ParamEnv, Ty, TyCtxt, Instance};
+use rustc_middle::ty::{Instance, ParamEnv, Ty, TyCtxt};
 use rustc_span::def_id::DefId;
 use rustc_span::Span;
 use rustc_target::abi::{
@@ -68,7 +68,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         src: RValue<'gcc>,
         order: AtomicOrdering,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
 
         let func = self.current_func();
 
@@ -138,7 +138,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         failure_order: AtomicOrdering,
         weak: bool,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
         let compare_exchange =
             self.context.get_builtin_function(&format!("__atomic_compare_exchange_{}", size));
         let order = self.context.new_rvalue_from_int(self.i32_type, order.to_gcc());
@@ -153,7 +153,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
         // NOTE: not sure why, but we have the wrong type here.
         let int_type = compare_exchange.get_param(2).to_rvalue().get_type();
-        let src = self.context.new_cast(self.location, src, int_type);
+        let src = self.context.new_bitcast(self.location, src, int_type);
         self.context.new_call(
             self.location,
             compare_exchange,
@@ -190,8 +190,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let casted_args: Vec<_> = param_types
             .into_iter()
             .zip(args.iter())
-            .enumerate()
+            .map(|(expected_ty, &actual_val)| {
-            .map(|(_i, (expected_ty, &actual_val))| {
                 let actual_ty = actual_val.get_type();
                 if expected_ty != actual_ty {
                     self.bitcast(actual_val, expected_ty)
@@ -225,7 +224,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
         let mut on_stack_param_indices = FxHashSet::default();
         if let Some(indices) = self.on_stack_params.borrow().get(&gcc_func) {
-            on_stack_param_indices = indices.clone();
+            on_stack_param_indices.clone_from(indices);
         }
 
         if all_args_match {
@@ -253,11 +252,26 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                     {
                         self.context.new_cast(self.location, actual_val, expected_ty)
                     } else if on_stack_param_indices.contains(&index) {
-                        actual_val.dereference(self.location).to_rvalue()
+                        let ty = actual_val.get_type();
+                        // It's possible that the value behind the pointer is actually not exactly
+                        // the expected type, so to go around that, we add a cast before
+                        // dereferencing the value.
+                        if let Some(pointee_val) = ty.get_pointee()
+                            && pointee_val != expected_ty
+                        {
+                            let new_val = self.context.new_cast(
+                                self.location,
+                                actual_val,
+                                expected_ty.make_pointer(),
+                            );
+                            new_val.dereference(self.location).to_rvalue()
+                        } else {
+                            actual_val.dereference(self.location).to_rvalue()
+                        }
                     } else {
                         assert!(
-                            !((actual_ty.is_vector() && !expected_ty.is_vector())
+                            (!expected_ty.is_vector() || actual_ty.is_vector())
-                                || (!actual_ty.is_vector() && expected_ty.is_vector())),
+                                && (expected_ty.is_vector() || !actual_ty.is_vector()),
                             "{:?} ({}) -> {:?} ({}), index: {:?}[{}]",
                             actual_ty,
                             actual_ty.is_vector(),
@@ -277,8 +291,8 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             .collect();
 
         // NOTE: to take into account variadic functions.
-        for i in casted_args.len()..args.len() {
+        for arg in args.iter().skip(casted_args.len()) {
-            casted_args.push(args[i]);
+            casted_args.push(*arg);
         }
 
         Cow::Owned(casted_args)
@@ -353,7 +367,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let function_address_names = self.function_address_names.borrow();
             let original_function_name = function_address_names.get(&func_ptr);
             llvm::adjust_intrinsic_arguments(
-                &self,
+                self,
                 gcc_func,
                 args.into(),
                 &func_name,
@@ -361,7 +375,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             )
         };
         let args_adjusted = args.len() != previous_arg_count;
-        let args = self.check_ptr_call("call", func_ptr, &*args);
+        let args = self.check_ptr_call("call", func_ptr, &args);
 
         // gccjit requires to use the result of functions, even when it's not used.
         // That's why we assign the result to a local or call add_eval().
@@ -373,7 +387,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             unsafe { RETURN_VALUE_COUNT += 1 };
             let return_value = self.cx.context.new_call_through_ptr(self.location, func_ptr, &args);
             let return_value = llvm::adjust_intrinsic_return_value(
-                &self,
+                self,
                 return_value,
                 &func_name,
                 &args,
@@ -441,7 +455,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         self.block.add_assignment(
             self.location,
             result,
-            self.cx.context.new_call(self.location, func, &args),
+            self.cx.context.new_call(self.location, func, args),
         );
         result.to_rvalue()
     }
@@ -596,7 +610,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     ) -> RValue<'gcc> {
         let try_block = self.current_func().new_block("try");
 
-        let current_block = self.block.clone();
+        let current_block = self.block;
         self.block = try_block;
         let call = self.call(typ, fn_attrs, None, func, args, None, instance); // TODO(antoyo): use funclet here?
         self.block = current_block;
@@ -630,8 +644,9 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         then: Block<'gcc>,
         catch: Block<'gcc>,
         _funclet: Option<&Funclet>,
+        instance: Option<Instance<'tcx>>,
     ) -> RValue<'gcc> {
-        let call_site = self.call(typ, fn_attrs, None, func, args, None);
+        let call_site = self.call(typ, fn_attrs, None, func, args, None, instance);
         let condition = self.context.new_rvalue_from_int(self.bool_type, 1);
         self.llbb().end_with_conditional(self.location, condition, then, catch);
         if let Some(_fn_abi) = fn_abi {
@@ -749,6 +764,24 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
             // FIXME(antoyo): this seems to produce the wrong result.
             return self.context.new_call(self.location, fmodf, &[a, b]);
         }
+
+        #[cfg(feature = "master")]
+        match self.cx.type_kind(a_type) {
+            TypeKind::Half | TypeKind::Float => {
+                let fmodf = self.context.get_builtin_function("fmodf");
+                return self.context.new_call(self.location, fmodf, &[a, b]);
+            }
+            TypeKind::Double => {
+                let fmod = self.context.get_builtin_function("fmod");
+                return self.context.new_call(self.location, fmod, &[a, b]);
+            }
+            TypeKind::FP128 => {
+                let fmodl = self.context.get_builtin_function("fmodl");
+                return self.context.new_call(self.location, fmodl, &[a, b]);
+            }
+            _ => (),
+        }
+
         if let Some(vector_type) = a_type_unqualified.dyncast_vector() {
             assert_eq!(a_type_unqualified, b.get_type().unqualified());
 
@@ -903,11 +936,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // TODO(antoyo): It might be better to return a LValue, but fixing the rustc API is non-trivial.
         self.stack_var_count.set(self.stack_var_count.get() + 1);
         self.current_func()
-            .new_local(
+            .new_local(self.location, ty, &format!("stack_var_{}", self.stack_var_count.get()))
-                self.location,
-                ty,
-                &format!("stack_var_{}", self.stack_var_count.get()),
-            )
             .get_address(self.location)
     }
 
@@ -993,7 +1022,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
             }
         }
 
-        let val = if let Some(_) = place.val.llextra {
+        let val = if place.val.llextra.is_some() {
             // FIXME: Merge with the `else` below?
             OperandValue::Ref(place.val)
         } else if place.layout.is_gcc_immediate() {
@@ -1125,7 +1154,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // the following cast is required to avoid this error:
         // gcc_jit_context_new_call: mismatching types for argument 2 of function "__atomic_store_4": assignment to param arg1 (type: int) from loadedValue3577 (type: unsigned int  __attribute__((aligned(4))))
         let int_type = atomic_store.get_param(1).to_rvalue().get_type();
-        let value = self.context.new_cast(self.location, value, int_type);
+        let value = self.context.new_bitcast(self.location, value, int_type);
         self.llbb().add_eval(
             self.location,
             self.context.new_call(self.location, atomic_store, &[ptr, value, ordering]),
@@ -1172,7 +1201,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // NOTE: due to opaque pointers now being used, we need to cast here.
         let ptr = self.context.new_cast(self.location, ptr, typ.make_pointer());
         // NOTE: array indexing is always considered in bounds in GCC (TODO(antoyo): to be verified).
-        let mut indices = indices.into_iter();
+        let mut indices = indices.iter();
         let index = indices.next().expect("first index in inbounds_gep");
         let mut result = self.context.new_array_access(self.location, ptr, *index);
         for index in indices {
@@ -1589,7 +1618,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         src: RValue<'gcc>,
         order: AtomicOrdering,
     ) -> RValue<'gcc> {
-        let size = src.get_type().get_size();
+        let size = get_maybe_pointer_size(src);
         let name = match op {
             AtomicRmwBinOp::AtomicXchg => format!("__atomic_exchange_{}", size),
             AtomicRmwBinOp::AtomicAdd => format!("__atomic_fetch_add_{}", size),
@@ -1620,7 +1649,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         let dst = self.context.new_cast(self.location, dst, volatile_void_ptr_type);
         // FIXME(antoyo): not sure why, but we have the wrong type here.
         let new_src_type = atomic_function.get_param(1).to_rvalue().get_type();
-        let src = self.context.new_cast(self.location, src, new_src_type);
+        let src = self.context.new_bitcast(self.location, src, new_src_type);
         let res = self.context.new_call(self.location, atomic_function, &[dst, src, order]);
         self.context.new_cast(self.location, res, src.get_type())
     }
@@ -1661,7 +1690,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         _instance: Option<Instance<'tcx>>,
     ) -> RValue<'gcc> {
         // FIXME(antoyo): remove when having a proper API.
-        let gcc_func = unsafe { std::mem::transmute(func) };
+        let gcc_func = unsafe { std::mem::transmute::<RValue<'gcc>, Function<'gcc>>(func) };
         let call = if self.functions.borrow().values().any(|value| *value == gcc_func) {
             self.function_call(func, args, funclet)
         } else {
@@ -1676,11 +1705,6 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
 
     fn zext(&mut self, value: RValue<'gcc>, dest_typ: Type<'gcc>) -> RValue<'gcc> {
         // FIXME(antoyo): this does not zero-extend.
-        if value.get_type().is_bool() && dest_typ.is_i8(&self.cx) {
-            // FIXME(antoyo): hack because base::from_immediate converts i1 to i8.
-            // Fix the code in codegen_ssa::base::from_immediate.
-            return value;
-        }
         self.gcc_int_cast(value, dest_typ)
     }
 
@@ -2049,7 +2073,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 self.context.new_rvalue_from_vector(self.location, mask_type, &vector_elements);
             let shifted = self.context.new_rvalue_vector_perm(self.location, res, res, mask);
             shift *= 2;
-            res = op(res, shifted, &self.context);
+            res = op(res, shifted, self.context);
         }
         self.context
             .new_vector_access(self.location, res, self.context.new_rvalue_zero(self.int_type))
@@ -2065,7 +2089,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     }
 
     pub fn vector_reduce_op(&mut self, src: RValue<'gcc>, op: BinaryOp) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| context.new_binary_op(loc, op, a.get_type(), a, b))
     }
 
@@ -2082,7 +2106,6 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let vector_type = src.get_type().unqualified().dyncast_vector().expect("vector type");
         let element_count = vector_type.get_num_units();
         (0..element_count)
-            .into_iter()
             .map(|i| {
                 self.context
                     .new_vector_access(
@@ -2113,7 +2136,6 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let vector_type = src.get_type().unqualified().dyncast_vector().expect("vector type");
         let element_count = vector_type.get_num_units();
         (0..element_count)
-            .into_iter()
             .map(|i| {
                 self.context
                     .new_vector_access(
@@ -2133,7 +2155,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     // Inspired by Hacker's Delight min implementation.
     pub fn vector_reduce_min(&mut self, src: RValue<'gcc>) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| {
             let differences_or_zeros = difference_or_zero(loc, a, b, context);
             context.new_binary_op(loc, BinaryOp::Plus, b.get_type(), b, differences_or_zeros)
@@ -2142,7 +2164,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     // Inspired by Hacker's Delight max implementation.
     pub fn vector_reduce_max(&mut self, src: RValue<'gcc>) -> RValue<'gcc> {
-        let loc = self.location.clone();
+        let loc = self.location;
         self.vector_reduce(src, |a, b, context| {
             let differences_or_zeros = difference_or_zero(loc, a, b, context);
             context.new_binary_op(loc, BinaryOp::Minus, a.get_type(), a, differences_or_zeros)
@@ -2337,7 +2359,13 @@ impl<'tcx> HasParamEnv<'tcx> for Builder<'_, '_, 'tcx> {
 
 impl<'tcx> HasTargetSpec for Builder<'_, '_, 'tcx> {
     fn target_spec(&self) -> &Target {
-        &self.cx.target_spec()
+        self.cx.target_spec()
+    }
+}
+
+impl<'tcx> HasWasmCAbiOpt for Builder<'_, '_, 'tcx> {
+    fn wasm_c_abi_opt(&self) -> WasmCAbi {
+        self.cx.wasm_c_abi_opt()
     }
 }
 
@@ -2422,3 +2450,19 @@ impl ToGccOrdering for AtomicOrdering {
         ordering as i32
     }
 }
+
+// Needed because gcc 12 `get_size()` doesn't work on pointers.
+#[cfg(feature = "master")]
+fn get_maybe_pointer_size(value: RValue<'_>) -> u32 {
+    value.get_type().get_size()
+}
+
+#[cfg(not(feature = "master"))]
+fn get_maybe_pointer_size(value: RValue<'_>) -> u32 {
+    let type_ = value.get_type();
+    if type_.get_pointee().is_some() {
+        std::mem::size_of::<*const ()>() as _
+    } else {
+        type_.get_size()
+    }
+}

compiler/rustc_codegen_gcc/src/callee.rs

@@ -28,7 +28,7 @@ pub fn get_fn<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, instance: Instance<'tcx>)
 
     let fn_abi = cx.fn_abi_of_instance(instance, ty::List::empty());
 
-    let func = if let Some(_func) = cx.get_declared_value(&sym) {
+    let func = if let Some(_func) = cx.get_declared_value(sym) {
         // FIXME(antoyo): we never reach this because get_declared_value only returns global variables
         // and here we try to get a function.
         unreachable!();
@@ -68,7 +68,7 @@ pub fn get_fn<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, instance: Instance<'tcx>)
         }*/
     } else {
         cx.linkage.set(FunctionType::Extern);
-        let func = cx.declare_fn(&sym, &fn_abi);
+        let func = cx.declare_fn(sym, fn_abi);
 
         attributes::from_fn_attrs(cx, func, instance);
 

compiler/rustc_codegen_gcc/src/common.rs

@@ -21,7 +21,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     fn global_string(&self, string: &str) -> LValue<'gcc> {
         // TODO(antoyo): handle non-null-terminated strings.
-        let string = self.context.new_string_literal(&*string);
+        let string = self.context.new_string_literal(string);
         let sym = self.generate_local_symbol_name("str");
         let global = self.declare_private_global(&sym, self.val_ty(string));
         global.global_set_initializer_rvalue(string);
@@ -187,7 +187,8 @@ impl<'gcc, 'tcx> ConstMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                     return self
                         .context
                         .new_rvalue_from_double(ty, f32::from_bits(data as u32) as f64);
-                } else if ty == self.double_type {
+                }
+                if ty == self.double_type {
                     return self.context.new_rvalue_from_double(ty, f64::from_bits(data as u64));
                 }
 
@@ -297,7 +298,7 @@ impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
         } else if self.is_ulonglong(cx) {
             cx.longlong_type
         } else {
-            self.clone()
+            *self
         }
     }
 
@@ -323,7 +324,7 @@ impl<'gcc, 'tcx> SignType<'gcc, 'tcx> for Type<'gcc> {
         } else if self.is_longlong(cx) {
             cx.ulonglong_type
         } else {
-            self.clone()
+            *self
         }
     }
 }
@@ -436,7 +437,7 @@ impl<'gcc, 'tcx> TypeReflection<'gcc, 'tcx> for Type<'gcc> {
     }
 
     fn is_vector(&self) -> bool {
-        let mut typ = self.clone();
+        let mut typ = *self;
         loop {
             if typ.dyncast_vector().is_some() {
                 return true;

compiler/rustc_codegen_gcc/src/consts.rs

@@ -1,15 +1,16 @@
 #[cfg(feature = "master")]
 use gccjit::{FnAttribute, VarAttribute, Visibility};
-use gccjit::{Function, GlobalKind, LValue, RValue, ToRValue};
+use gccjit::{Function, GlobalKind, LValue, RValue, ToRValue, Type};
-use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods, DerivedTypeMethods, StaticMethods};
+use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods, StaticMethods};
+use rustc_hir::def::DefKind;
+use rustc_middle::bug;
 use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
 use rustc_middle::mir::interpret::{
     self, read_target_uint, ConstAllocation, ErrorHandled, Scalar as InterpScalar,
 };
-use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::span_bug;
 use rustc_middle::ty::layout::LayoutOf;
-use rustc_middle::ty::{self, Instance, Ty};
+use rustc_middle::ty::{self, Instance};
 use rustc_span::def_id::DefId;
 use rustc_target::abi::{self, Align, HasDataLayout, Primitive, Size, WrappingRange};
 
@@ -63,16 +64,15 @@ impl<'gcc, 'tcx> StaticMethods for CodegenCx<'gcc, 'tcx> {
         global_value
     }
 
+    #[cfg_attr(not(feature = "master"), allow(unused_mut))]
     fn codegen_static(&self, def_id: DefId) {
         let attrs = self.tcx.codegen_fn_attrs(def_id);
 
-        let value = match codegen_static_initializer(&self, def_id) {
+        let Ok((value, alloc)) = codegen_static_initializer(self, def_id) else {
-            Ok((value, _)) => value,
             // Error has already been reported
-            Err(_) => return,
+            return;
         };
-
+        let alloc = alloc.inner();
-        let global = self.get_static(def_id);
 
         // boolean SSA values are i1, but they have to be stored in i8 slots,
         // otherwise some LLVM optimization passes don't work as expected
@@ -81,23 +81,25 @@ impl<'gcc, 'tcx> StaticMethods for CodegenCx<'gcc, 'tcx> {
             unimplemented!();
         };
 
-        let instance = Instance::mono(self.tcx, def_id);
+        let is_thread_local = attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
-        let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
+        let global = self.get_static_inner(def_id, val_llty);
-        let gcc_type = self.layout_of(ty).gcc_type(self);
 
-        set_global_alignment(self, global, self.align_of(ty));
+        #[cfg(feature = "master")]
+        if global.to_rvalue().get_type() != val_llty {
+            global.to_rvalue().set_type(val_llty);
+        }
+        set_global_alignment(self, global, alloc.align);
 
-        let value = self.bitcast_if_needed(value, gcc_type);
         global.global_set_initializer_rvalue(value);
 
         // As an optimization, all shared statics which do not have interior
         // mutability are placed into read-only memory.
-        if !self.tcx.static_mutability(def_id).unwrap().is_mut() && self.type_is_freeze(ty) {
+        if alloc.mutability.is_not() {
             #[cfg(feature = "master")]
             global.global_set_readonly();
         }
 
-        if attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL) {
+        if is_thread_local {
             // Do not allow LLVM to change the alignment of a TLS on macOS.
             //
             // By default a global's alignment can be freely increased.
@@ -205,35 +207,49 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     pub fn get_static(&self, def_id: DefId) -> LValue<'gcc> {
         let instance = Instance::mono(self.tcx, def_id);
-        let fn_attrs = self.tcx.codegen_fn_attrs(def_id);
+        let DefKind::Static { nested, .. } = self.tcx.def_kind(def_id) else { bug!() };
+        // Nested statics do not have a type, so pick a random type and let `define_static` figure out
+        // the gcc type from the actual evaluated initializer.
+        let gcc_type = if nested {
+            self.type_i8()
+        } else {
+            let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
+            self.layout_of(ty).gcc_type(self)
+        };
+
+        self.get_static_inner(def_id, gcc_type)
+    }
+
+    pub(crate) fn get_static_inner(&self, def_id: DefId, gcc_type: Type<'gcc>) -> LValue<'gcc> {
+        let instance = Instance::mono(self.tcx, def_id);
         if let Some(&global) = self.instances.borrow().get(&instance) {
+            trace!("used cached value");
             return global;
         }
 
-        let defined_in_current_codegen_unit =
+        // FIXME: Once we stop removing globals in `codegen_static`, we can uncomment this code.
-            self.codegen_unit.items().contains_key(&MonoItem::Static(def_id));
+        // let defined_in_current_codegen_unit =
-        assert!(
+        //     self.codegen_unit.items().contains_key(&MonoItem::Static(def_id));
-            !defined_in_current_codegen_unit,
+        // assert!(
-            "consts::get_static() should always hit the cache for \
+        //     !defined_in_current_codegen_unit,
-                 statics defined in the same CGU, but did not for `{:?}`",
+        //     "consts::get_static() should always hit the cache for \
-            def_id
+        //          statics defined in the same CGU, but did not for `{:?}`",
-        );
+        //     def_id
-
+        // );
-        let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
         let sym = self.tcx.symbol_name(instance).name;
+        let fn_attrs = self.tcx.codegen_fn_attrs(def_id);
 
         let global = if def_id.is_local() && !self.tcx.is_foreign_item(def_id) {
-            let llty = self.layout_of(ty).gcc_type(self);
             if let Some(global) = self.get_declared_value(sym) {
-                if self.val_ty(global) != self.type_ptr_to(llty) {
+                if self.val_ty(global) != self.type_ptr_to(gcc_type) {
                     span_bug!(self.tcx.def_span(def_id), "Conflicting types for static");
                 }
             }
 
             let is_tls = fn_attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
             let global = self.declare_global(
-                &sym,
+                sym,
-                llty,
+                gcc_type,
                 GlobalKind::Exported,
                 is_tls,
                 fn_attrs.link_section,
@@ -246,7 +262,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
             global
         } else {
-            check_and_apply_linkage(&self, &fn_attrs, ty, sym)
+            check_and_apply_linkage(self, fn_attrs, gcc_type, sym)
         };
 
         if !def_id.is_local() {
@@ -360,18 +376,14 @@ fn codegen_static_initializer<'gcc, 'tcx>(
 fn check_and_apply_linkage<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
     attrs: &CodegenFnAttrs,
-    ty: Ty<'tcx>,
+    gcc_type: Type<'gcc>,
     sym: &str,
 ) -> LValue<'gcc> {
     let is_tls = attrs.flags.contains(CodegenFnAttrFlags::THREAD_LOCAL);
-    let gcc_type = cx.layout_of(ty).gcc_type(cx);
     if let Some(linkage) = attrs.import_linkage {
         // Declare a symbol `foo` with the desired linkage.
-        let global1 = cx.declare_global_with_linkage(
+        let global1 =
-            &sym,
+            cx.declare_global_with_linkage(sym, cx.type_i8(), base::global_linkage_to_gcc(linkage));
-            cx.type_i8(),
-            base::global_linkage_to_gcc(linkage),
-        );
 
         // Declare an internal global `extern_with_linkage_foo` which
         // is initialized with the address of `foo`.  If `foo` is
@@ -380,7 +392,7 @@ fn check_and_apply_linkage<'gcc, 'tcx>(
         // `extern_with_linkage_foo` will instead be initialized to
         // zero.
         let mut real_name = "_rust_extern_with_linkage_".to_string();
-        real_name.push_str(&sym);
+        real_name.push_str(sym);
         let global2 = cx.define_global(&real_name, gcc_type, is_tls, attrs.link_section);
         // TODO(antoyo): set linkage.
         let value = cx.const_ptrcast(global1.get_address(None), gcc_type);
@@ -397,6 +409,6 @@ fn check_and_apply_linkage<'gcc, 'tcx>(
         // don't do this then linker errors can be generated where the linker
         // complains that one object files has a thread local version of the
         // symbol and another one doesn't.
-        cx.declare_global(&sym, gcc_type, GlobalKind::Imported, is_tls, attrs.link_section)
+        cx.declare_global(sym, gcc_type, GlobalKind::Imported, is_tls, attrs.link_section)
     }
 }

compiler/rustc_codegen_gcc/src/context.rs

@@ -68,6 +68,10 @@ pub struct CodegenCx<'gcc, 'tcx> {
     pub sizet_type: Type<'gcc>,
 
     pub supports_128bit_integers: bool,
+    pub supports_f16_type: bool,
+    pub supports_f32_type: bool,
+    pub supports_f64_type: bool,
+    pub supports_f128_type: bool,
 
     pub float_type: Type<'gcc>,
     pub double_type: Type<'gcc>,
@@ -110,7 +114,7 @@ pub struct CodegenCx<'gcc, 'tcx> {
     local_gen_sym_counter: Cell<usize>,
 
     eh_personality: Cell<Option<RValue<'gcc>>>,
-    #[cfg(feature="master")]
+    #[cfg(feature = "master")]
     pub rust_try_fn: Cell<Option<(Type<'gcc>, Function<'gcc>)>>,
 
     pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,
@@ -122,16 +126,21 @@ pub struct CodegenCx<'gcc, 'tcx> {
     /// FIXME(antoyo): fix the rustc API to avoid having this hack.
     pub structs_as_pointer: RefCell<FxHashSet<RValue<'gcc>>>,
 
-    #[cfg(feature="master")]
+    #[cfg(feature = "master")]
     pub cleanup_blocks: RefCell<FxHashSet<Block<'gcc>>>,
 }
 
 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
+    #[allow(clippy::too_many_arguments)]
     pub fn new(
         context: &'gcc Context<'gcc>,
         codegen_unit: &'tcx CodegenUnit<'tcx>,
         tcx: TyCtxt<'tcx>,
         supports_128bit_integers: bool,
+        supports_f16_type: bool,
+        supports_f32_type: bool,
+        supports_f64_type: bool,
+        supports_f128_type: bool,
     ) -> Self {
         let create_type = |ctype, rust_type| {
             let layout = tcx.layout_of(ParamEnv::reveal_all().and(rust_type)).unwrap();
@@ -304,6 +313,10 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             sizet_type,
 
             supports_128bit_integers,
+            supports_f16_type,
+            supports_f32_type,
+            supports_f64_type,
+            supports_f128_type,
 
             float_type,
             double_type,
@@ -324,11 +337,11 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             struct_types: Default::default(),
             local_gen_sym_counter: Cell::new(0),
             eh_personality: Cell::new(None),
-            #[cfg(feature="master")]
+            #[cfg(feature = "master")]
             rust_try_fn: Cell::new(None),
             pointee_infos: Default::default(),
             structs_as_pointer: Default::default(),
-            #[cfg(feature="master")]
+            #[cfg(feature = "master")]
             cleanup_blocks: Default::default(),
         };
         // TODO(antoyo): instead of doing this, add SsizeT to libgccjit.
@@ -385,7 +398,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     }
 
     pub fn sess(&self) -> &'tcx Session {
-        &self.tcx.sess
+        self.tcx.sess
     }
 
     pub fn bitcast_if_needed(
@@ -432,7 +445,9 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         let func_name = self.tcx.symbol_name(instance).name;
 
         let func = if self.intrinsics.borrow().contains_key(func_name) {
-            self.intrinsics.borrow()[func_name].clone()
+            self.intrinsics.borrow()[func_name]
+        } else if let Some(variable) = self.get_declared_value(func_name) {
+            return variable;
         } else {
             get_fn(self, instance)
         };
@@ -485,7 +500,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                 let symbol_name = tcx.symbol_name(instance).name;
                 let fn_abi = self.fn_abi_of_instance(instance, ty::List::empty());
                 self.linkage.set(FunctionType::Extern);
-                let func = self.declare_fn(symbol_name, &fn_abi);
+                let func = self.declare_fn(symbol_name, fn_abi);
                 let func: RValue<'gcc> = unsafe { std::mem::transmute(func) };
                 func
             }
@@ -496,7 +511,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
                     "rust_eh_personality"
                 };
                 let func = self.declare_func(name, self.type_i32(), &[], true);
-                unsafe { std::mem::transmute(func) }
+                unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) }
             }
         };
         // TODO(antoyo): apply target cpu attributes.
@@ -505,7 +520,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     }
 
     fn sess(&self) -> &Session {
-        &self.tcx.sess
+        self.tcx.sess
     }
 
     fn codegen_unit(&self) -> &'tcx CodegenUnit<'tcx> {
@@ -522,7 +537,7 @@ impl<'gcc, 'tcx> MiscMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
 
     fn declare_c_main(&self, fn_type: Self::Type) -> Option<Self::Function> {
         let entry_name = self.sess().target.entry_name.as_ref();
-        if self.get_declared_value(entry_name).is_none() {
+        if !self.functions.borrow().contains_key(entry_name) {
             Some(self.declare_entry_fn(entry_name, fn_type, ()))
         } else {
             // If the symbol already exists, it is an error: for example, the user wrote
@@ -614,7 +629,7 @@ impl<'b, 'tcx> CodegenCx<'b, 'tcx> {
         // user defined names
         let mut name = String::with_capacity(prefix.len() + 6);
         name.push_str(prefix);
-        name.push_str(".");
+        name.push('.');
         name.push_str(&(idx as u64).to_base(ALPHANUMERIC_ONLY));
         name
     }

compiler/rustc_codegen_gcc/src/debuginfo.rs

@@ -90,7 +90,7 @@ fn compute_mir_scopes<'gcc, 'tcx>(
 /// FIXME(tempdragon/?): Add Scope Support Here.
 fn make_mir_scope<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
-    instance: Instance<'tcx>,
+    _instance: Instance<'tcx>,
     mir: &Body<'tcx>,
     variables: &Option<BitSet<SourceScope>>,
     debug_context: &mut FunctionDebugContext<'tcx, (), Location<'gcc>>,
@@ -103,7 +103,7 @@ fn make_mir_scope<'gcc, 'tcx>(
 
     let scope_data = &mir.source_scopes[scope];
     let parent_scope = if let Some(parent) = scope_data.parent_scope {
-        make_mir_scope(cx, instance, mir, variables, debug_context, instantiated, parent);
+        make_mir_scope(cx, _instance, mir, variables, debug_context, instantiated, parent);
         debug_context.scopes[parent]
     } else {
         // The root is the function itself.
@@ -117,7 +117,7 @@ fn make_mir_scope<'gcc, 'tcx>(
         return;
     };
 
-    if let Some(vars) = variables {
+    if let Some(ref vars) = *variables {
         if !vars.contains(scope) && scope_data.inlined.is_none() {
             // Do not create a DIScope if there are no variables defined in this
             // MIR `SourceScope`, and it's not `inlined`, to avoid debuginfo bloat.
@@ -135,8 +135,14 @@ fn make_mir_scope<'gcc, 'tcx>(
     let inlined_at = scope_data.inlined.map(|(_, callsite_span)| {
         // FIXME(eddyb) this doesn't account for the macro-related
         // `Span` fixups that `rustc_codegen_ssa::mir::debuginfo` does.
-        let callsite_scope = parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
+
-        cx.dbg_loc(callsite_scope, parent_scope.inlined_at, callsite_span)
+        // TODO(tempdragon): Add scope support and then revert to cg_llvm version of this closure
+        // NOTE: These variables passed () here.
+        // Changed to comply to clippy.
+
+        /* let callsite_scope =  */
+        parent_scope.adjust_dbg_scope_for_span(cx, callsite_span);
+        cx.dbg_loc(/* callsite_scope */ (), parent_scope.inlined_at, callsite_span)
     });
     let p_inlined_at = parent_scope.inlined_at;
     // TODO(tempdragon): dbg_scope: Add support for scope extension here.
@@ -224,7 +230,7 @@ impl<'gcc, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
             file_end_pos: BytePos(0),
         };
         let mut fn_debug_context = FunctionDebugContext {
-            scopes: IndexVec::from_elem(empty_scope, &mir.source_scopes.as_slice()),
+            scopes: IndexVec::from_elem(empty_scope, mir.source_scopes.as_slice()),
             inlined_function_scopes: Default::default(),
         };
 
@@ -273,16 +279,19 @@ impl<'gcc, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     ) -> Self::DILocation {
         let pos = span.lo();
         let DebugLoc { file, line, col } = self.lookup_debug_loc(pos);
-        let loc = match &file.name {
+        let loc = match file.name {
-            rustc_span::FileName::Real(name) => match name {
+            rustc_span::FileName::Real(ref name) => match *name {
-                rustc_span::RealFileName::LocalPath(name) => {
+                rustc_span::RealFileName::LocalPath(ref name) => {
                     if let Some(name) = name.to_str() {
                         self.context.new_location(name, line as i32, col as i32)
                     } else {
                         Location::null()
                     }
                 }
-                rustc_span::RealFileName::Remapped { local_path, virtual_name: _ } => {
+                rustc_span::RealFileName::Remapped {
+                    ref local_path,
+                    virtual_name: ref _unused,
+                } => {
                     if let Some(name) = local_path.as_ref() {
                         if let Some(name) = name.to_str() {
                             self.context.new_location(name, line as i32, col as i32)

compiler/rustc_codegen_gcc/src/declare.rs

@@ -35,7 +35,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
 
     pub fn declare_unnamed_global(&self, ty: Type<'gcc>) -> LValue<'gcc> {
         let name = self.generate_local_symbol_name("global");
-        self.context.new_global(None, GlobalKind::Internal, ty, &name)
+        self.context.new_global(None, GlobalKind::Internal, ty, name)
     }
 
     pub fn declare_global_with_linkage(
@@ -176,16 +176,14 @@ fn declare_raw_fn<'gcc>(
         cx.functions.borrow()[name]
     } else {
         let params: Vec<_> = param_types
-            .into_iter()
+            .iter()
             .enumerate()
-            .map(|(index, param)| {
+            .map(|(index, param)| cx.context.new_parameter(None, *param, format!("param{}", index))) // TODO(antoyo): set name.
-                cx.context.new_parameter(None, *param, &format!("param{}", index))
-            }) // TODO(antoyo): set name.
             .collect();
         #[cfg(not(feature = "master"))]
-        let name = mangle_name(name);
+        let name = &mangle_name(name);
         let func =
-            cx.context.new_function(None, cx.linkage.get(), return_type, &params, &name, variadic);
+            cx.context.new_function(None, cx.linkage.get(), return_type, &params, name, variadic);
         cx.functions.borrow_mut().insert(name.to_string(), func);
 
         #[cfg(feature = "master")]
@@ -200,10 +198,10 @@ fn declare_raw_fn<'gcc>(
             // create a wrapper function that calls rust_eh_personality.
 
             let params: Vec<_> = param_types
-                .into_iter()
+                .iter()
                 .enumerate()
                 .map(|(index, param)| {
-                    cx.context.new_parameter(None, *param, &format!("param{}", index))
+                    cx.context.new_parameter(None, *param, format!("param{}", index))
                 }) // TODO(antoyo): set name.
                 .collect();
             let gcc_func = cx.context.new_function(

compiler/rustc_codegen_gcc/src/int.rs

@@ -2,8 +2,6 @@
 //! This module exists because some integer types are not supported on some gcc platforms, e.g.
 //! 128-bit integers on 32-bit platforms and thus require to be handled manually.
 
-use std::convert::TryFrom;
-
 use gccjit::{BinaryOp, ComparisonOp, FunctionType, Location, RValue, ToRValue, Type, UnaryOp};
 use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
 use rustc_codegen_ssa::traits::{BackendTypes, BaseTypeMethods, BuilderMethods, OverflowOp};
@@ -40,7 +38,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             self.cx.context.new_unary_op(self.location, operation, typ, a)
         } else {
             let element_type = typ.dyncast_array().expect("element type");
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 typ,
                 self.cx.context.new_unary_op(
                     self.location,
@@ -83,7 +81,19 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let b = self.context.new_cast(self.location, b, a_type);
                 a >> b
             } else {
-                a >> b
+                let a_size = a_type.get_size();
+                let b_size = b_type.get_size();
+                match a_size.cmp(&b_size) {
+                    std::cmp::Ordering::Less => {
+                        let a = self.context.new_cast(self.location, a, b_type);
+                        a >> b
+                    }
+                    std::cmp::Ordering::Equal => a >> b,
+                    std::cmp::Ordering::Greater => {
+                        let b = self.context.new_cast(self.location, b, a_type);
+                        a >> b
+                    }
+                }
             }
         } else if a_type.is_vector() && a_type.is_vector() {
             a >> b
@@ -114,7 +124,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let shift_value = self.gcc_sub(b, sixty_four);
             let high = self.high(a);
             let sign = if a_type.is_signed(self) { high >> sixty_three } else { zero };
-            let array_value = self.from_low_high_rvalues(a_type, high >> shift_value, sign);
+            let array_value = self.concat_low_high_rvalues(a_type, high >> shift_value, sign);
             then_block.add_assignment(self.location, result, array_value);
             then_block.end_with_jump(self.location, after_block);
 
@@ -126,12 +136,15 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             let shift_value = self.gcc_sub(sixty_four, b);
             // NOTE: cast low to its unsigned type in order to perform a logical right shift.
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
             let casted_low = self.context.new_cast(self.location, self.low(a), unsigned_type);
             let shifted_low = casted_low >> self.context.new_cast(self.location, b, unsigned_type);
             let shifted_low = self.context.new_cast(self.location, shifted_low, native_int_type);
-            let array_value =
+            let array_value = self.concat_low_high_rvalues(
-                self.from_low_high_rvalues(a_type, (high << shift_value) | shifted_low, high >> b);
+                a_type,
+                (high << shift_value) | shifted_low,
+                high >> b,
+            );
             actual_else_block.add_assignment(self.location, result, array_value);
             actual_else_block.end_with_jump(self.location, after_block);
 
@@ -255,10 +268,10 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     ) -> (<Self as BackendTypes>::Value, <Self as BackendTypes>::Value) {
         use rustc_middle::ty::{Int, IntTy::*, Uint, UintTy::*};
 
-        let new_kind = match typ.kind() {
+        let new_kind = match *typ.kind() {
             Int(t @ Isize) => Int(t.normalize(self.tcx.sess.target.pointer_width)),
             Uint(t @ Usize) => Uint(t.normalize(self.tcx.sess.target.pointer_width)),
-            t @ (Uint(_) | Int(_)) => t.clone(),
+            t @ (Uint(_) | Int(_)) => t,
             _ => panic!("tried to get overflow intrinsic for op applied to non-int type"),
         };
 
@@ -344,7 +357,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             }
         };
 
-        let intrinsic = self.context.get_builtin_function(&name);
+        let intrinsic = self.context.get_builtin_function(name);
         let res = self
             .current_func()
             // TODO(antoyo): is it correct to use rhs type instead of the parameter typ?
@@ -454,7 +467,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             let native_int_type = a_type.dyncast_array().expect("get element type");
             // NOTE: cast low to its unsigned type in order to perform a comparison correctly (e.g.
             // the sign is only on high).
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
 
             let lhs_low = self.context.new_cast(self.location, self.low(lhs), unsigned_type);
             let rhs_low = self.context.new_cast(self.location, self.low(rhs), unsigned_type);
@@ -589,7 +602,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 | IntPredicate::IntULT
                 | IntPredicate::IntULE => {
                     if !a_type.is_vector() {
-                        let unsigned_type = a_type.to_unsigned(&self.cx);
+                        let unsigned_type = a_type.to_unsigned(self.cx);
                         lhs = self.context.new_cast(self.location, lhs, unsigned_type);
                         rhs = self.context.new_cast(self.location, rhs, unsigned_type);
                     }
@@ -612,7 +625,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         {
             a ^ b
         } else {
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 a_type,
                 self.low(a) ^ self.low(b),
                 self.high(a) ^ self.high(b),
@@ -635,7 +648,19 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let b = self.context.new_cast(self.location, b, a_type);
                 a << b
             } else {
-                a << b
+                let a_size = a_type.get_size();
+                let b_size = b_type.get_size();
+                match a_size.cmp(&b_size) {
+                    std::cmp::Ordering::Less => {
+                        let a = self.context.new_cast(self.location, a, b_type);
+                        a << b
+                    }
+                    std::cmp::Ordering::Equal => a << b,
+                    std::cmp::Ordering::Greater => {
+                        let b = self.context.new_cast(self.location, b, a_type);
+                        a << b
+                    }
+                }
             }
         } else if a_type.is_vector() && a_type.is_vector() {
             a << b
@@ -661,7 +686,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
             self.llbb().end_with_conditional(self.location, condition, then_block, else_block);
 
             let array_value =
-                self.from_low_high_rvalues(a_type, zero, self.low(a) << (b - sixty_four));
+                self.concat_low_high_rvalues(a_type, zero, self.low(a) << (b - sixty_four));
             then_block.add_assignment(self.location, result, array_value);
             then_block.end_with_jump(self.location, after_block);
 
@@ -673,13 +698,13 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // NOTE: cast low to its unsigned type in order to perform a logical right shift.
             // TODO(antoyo): adjust this ^ comment.
-            let unsigned_type = native_int_type.to_unsigned(&self.cx);
+            let unsigned_type = native_int_type.to_unsigned(self.cx);
             let casted_low = self.context.new_cast(self.location, self.low(a), unsigned_type);
             let shift_value = self.context.new_cast(self.location, sixty_four - b, unsigned_type);
             let high_low =
                 self.context.new_cast(self.location, casted_low >> shift_value, native_int_type);
 
-            let array_value = self.from_low_high_rvalues(
+            let array_value = self.concat_low_high_rvalues(
                 a_type,
                 self.low(a) << b,
                 (self.high(a) << b) | high_low,
@@ -708,7 +733,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // NOTE: we also need to swap the two elements here, in addition to swapping inside
             // the elements themselves like done above.
-            return self.from_low_high_rvalues(arg_type, swapped_msb, swapped_lsb);
+            return self.concat_low_high_rvalues(arg_type, swapped_msb, swapped_lsb);
         }
 
         // TODO(antoyo): check if it's faster to use string literals and a
@@ -727,10 +752,10 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     pub fn gcc_int(&self, typ: Type<'gcc>, int: i64) -> RValue<'gcc> {
         if self.is_native_int_type_or_bool(typ) {
-            self.context.new_rvalue_from_long(typ, i64::try_from(int).expect("i64::try_from"))
+            self.context.new_rvalue_from_long(typ, int)
         } else {
             // NOTE: set the sign in high.
-            self.from_low_high(typ, int, -(int.is_negative() as i64))
+            self.concat_low_high(typ, int, -(int.is_negative() as i64))
         }
     }
 
@@ -740,10 +765,9 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             let num = self.context.new_rvalue_from_long(self.u64_type, int as i64);
             self.gcc_int_cast(num, typ)
         } else if self.is_native_int_type_or_bool(typ) {
-            self.context
+            self.context.new_rvalue_from_long(typ, int as i64)
-                .new_rvalue_from_long(typ, u64::try_from(int).expect("u64::try_from") as i64)
         } else {
-            self.from_low_high(typ, int as i64, 0)
+            self.concat_low_high(typ, int as i64, 0)
         }
     }
 
@@ -760,7 +784,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
                 let shift = high << sixty_four;
                 shift | self.context.new_cast(None, low, typ)
             } else {
-                self.from_low_high(typ, low as i64, high as i64)
+                self.concat_low_high(typ, low as i64, high as i64)
             }
         } else if typ.is_i128(self) {
             // FIXME(antoyo): libgccjit cannot create 128-bit values yet.
@@ -775,7 +799,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         if self.is_native_int_type_or_bool(typ) {
             self.context.new_rvalue_zero(typ)
         } else {
-            self.from_low_high(typ, 0, 0)
+            self.concat_low_high(typ, 0, 0)
         }
     }
 
@@ -813,7 +837,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
                 "both types should either be native or non-native for or operation"
             );
             let native_int_type = a_type.dyncast_array().expect("get element type");
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 a_type,
                 self.context.new_binary_op(
                     loc,
@@ -858,7 +882,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             let is_negative =
                 self.context.new_comparison(None, ComparisonOp::LessThan, value, zero);
             let is_negative = self.gcc_int_cast(is_negative, dest_element_type);
-            self.from_low_high_rvalues(
+            self.concat_low_high_rvalues(
                 dest_typ,
                 self.context.new_cast(None, value, dest_element_type),
                 self.context.new_unary_op(None, UnaryOp::Minus, dest_element_type, is_negative),
@@ -926,7 +950,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             return self.context.new_cast(None, value, dest_typ);
         }
 
-        debug_assert!(value_type.dyncast_array().is_some());
+        debug_assert!(dest_typ.dyncast_array().is_some());
         let name_suffix = match self.type_kind(value_type) {
             TypeKind::Float => "sfti",
             TypeKind::Double => "dfti",
@@ -978,7 +1002,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             .to_rvalue()
     }
 
-    fn from_low_high_rvalues(
+    fn concat_low_high_rvalues(
         &self,
         typ: Type<'gcc>,
         low: RValue<'gcc>,
@@ -993,7 +1017,7 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
         self.context.new_array_constructor(None, typ, &values)
     }
 
-    fn from_low_high(&self, typ: Type<'gcc>, low: i64, high: i64) -> RValue<'gcc> {
+    fn concat_low_high(&self, typ: Type<'gcc>, low: i64, high: i64) -> RValue<'gcc> {
         let (first, last) = match self.sess().target.options.endian {
             Endian::Little => (low, high),
             Endian::Big => (high, low),

compiler/rustc_codegen_gcc/src/intrinsic/archs.rs

@@ -74,6 +74,10 @@ match name {
     "llvm.amdgcn.cvt.sr.bf8.f32" => "__builtin_amdgcn_cvt_sr_bf8_f32",
     "llvm.amdgcn.cvt.sr.fp8.f32" => "__builtin_amdgcn_cvt_sr_fp8_f32",
     "llvm.amdgcn.dispatch.id" => "__builtin_amdgcn_dispatch_id",
+    "llvm.amdgcn.dot4.f32.bf8.bf8" => "__builtin_amdgcn_dot4_f32_bf8_bf8",
+    "llvm.amdgcn.dot4.f32.bf8.fp8" => "__builtin_amdgcn_dot4_f32_bf8_fp8",
+    "llvm.amdgcn.dot4.f32.fp8.bf8" => "__builtin_amdgcn_dot4_f32_fp8_bf8",
+    "llvm.amdgcn.dot4.f32.fp8.fp8" => "__builtin_amdgcn_dot4_f32_fp8_fp8",
     "llvm.amdgcn.ds.add.gs.reg.rtn" => "__builtin_amdgcn_ds_add_gs_reg_rtn",
     "llvm.amdgcn.ds.bpermute" => "__builtin_amdgcn_ds_bpermute",
     "llvm.amdgcn.ds.fadd.v2bf16" => "__builtin_amdgcn_ds_atomic_fadd_v2bf16",
@@ -2291,6 +2295,10 @@ match name {
     "llvm.loongarch.csrxchg.d" => "__builtin_loongarch_csrxchg_d",
     "llvm.loongarch.csrxchg.w" => "__builtin_loongarch_csrxchg_w",
     "llvm.loongarch.dbar" => "__builtin_loongarch_dbar",
+    "llvm.loongarch.frecipe.d" => "__builtin_loongarch_frecipe_d",
+    "llvm.loongarch.frecipe.s" => "__builtin_loongarch_frecipe_s",
+    "llvm.loongarch.frsqrte.d" => "__builtin_loongarch_frsqrte_d",
+    "llvm.loongarch.frsqrte.s" => "__builtin_loongarch_frsqrte_s",
     "llvm.loongarch.ibar" => "__builtin_loongarch_ibar",
     "llvm.loongarch.iocsrrd.b" => "__builtin_loongarch_iocsrrd_b",
     "llvm.loongarch.iocsrrd.d" => "__builtin_loongarch_iocsrrd_d",
@@ -2529,6 +2537,8 @@ match name {
     "llvm.loongarch.lasx.xvfnmsub.s" => "__builtin_lasx_xvfnmsub_s",
     "llvm.loongarch.lasx.xvfrecip.d" => "__builtin_lasx_xvfrecip_d",
     "llvm.loongarch.lasx.xvfrecip.s" => "__builtin_lasx_xvfrecip_s",
+    "llvm.loongarch.lasx.xvfrecipe.d" => "__builtin_lasx_xvfrecipe_d",
+    "llvm.loongarch.lasx.xvfrecipe.s" => "__builtin_lasx_xvfrecipe_s",
     "llvm.loongarch.lasx.xvfrint.d" => "__builtin_lasx_xvfrint_d",
     "llvm.loongarch.lasx.xvfrint.s" => "__builtin_lasx_xvfrint_s",
     "llvm.loongarch.lasx.xvfrintrm.d" => "__builtin_lasx_xvfrintrm_d",
@@ -2541,6 +2551,8 @@ match name {
     "llvm.loongarch.lasx.xvfrintrz.s" => "__builtin_lasx_xvfrintrz_s",
     "llvm.loongarch.lasx.xvfrsqrt.d" => "__builtin_lasx_xvfrsqrt_d",
     "llvm.loongarch.lasx.xvfrsqrt.s" => "__builtin_lasx_xvfrsqrt_s",
+    "llvm.loongarch.lasx.xvfrsqrte.d" => "__builtin_lasx_xvfrsqrte_d",
+    "llvm.loongarch.lasx.xvfrsqrte.s" => "__builtin_lasx_xvfrsqrte_s",
     "llvm.loongarch.lasx.xvfrstp.b" => "__builtin_lasx_xvfrstp_b",
     "llvm.loongarch.lasx.xvfrstp.h" => "__builtin_lasx_xvfrstp_h",
     "llvm.loongarch.lasx.xvfrstpi.b" => "__builtin_lasx_xvfrstpi_b",
@@ -3255,6 +3267,8 @@ match name {
     "llvm.loongarch.lsx.vfnmsub.s" => "__builtin_lsx_vfnmsub_s",
     "llvm.loongarch.lsx.vfrecip.d" => "__builtin_lsx_vfrecip_d",
     "llvm.loongarch.lsx.vfrecip.s" => "__builtin_lsx_vfrecip_s",
+    "llvm.loongarch.lsx.vfrecipe.d" => "__builtin_lsx_vfrecipe_d",
+    "llvm.loongarch.lsx.vfrecipe.s" => "__builtin_lsx_vfrecipe_s",
     "llvm.loongarch.lsx.vfrint.d" => "__builtin_lsx_vfrint_d",
     "llvm.loongarch.lsx.vfrint.s" => "__builtin_lsx_vfrint_s",
     "llvm.loongarch.lsx.vfrintrm.d" => "__builtin_lsx_vfrintrm_d",
@@ -3267,6 +3281,8 @@ match name {
     "llvm.loongarch.lsx.vfrintrz.s" => "__builtin_lsx_vfrintrz_s",
     "llvm.loongarch.lsx.vfrsqrt.d" => "__builtin_lsx_vfrsqrt_d",
     "llvm.loongarch.lsx.vfrsqrt.s" => "__builtin_lsx_vfrsqrt_s",
+    "llvm.loongarch.lsx.vfrsqrte.d" => "__builtin_lsx_vfrsqrte_d",
+    "llvm.loongarch.lsx.vfrsqrte.s" => "__builtin_lsx_vfrsqrte_s",
     "llvm.loongarch.lsx.vfrstp.b" => "__builtin_lsx_vfrstp_b",
     "llvm.loongarch.lsx.vfrstp.h" => "__builtin_lsx_vfrstp_h",
     "llvm.loongarch.lsx.vfrstpi.b" => "__builtin_lsx_vfrstpi_b",
@@ -4434,6 +4450,7 @@ match name {
     "llvm.nvvm.abs.bf16x2" => "__nvvm_abs_bf16x2",
     "llvm.nvvm.abs.i" => "__nvvm_abs_i",
     "llvm.nvvm.abs.ll" => "__nvvm_abs_ll",
+    "llvm.nvvm.activemask" => "__nvvm_activemask",
     "llvm.nvvm.add.rm.d" => "__nvvm_add_rm_d",
     "llvm.nvvm.add.rm.f" => "__nvvm_add_rm_f",
     "llvm.nvvm.add.rm.ftz.f" => "__nvvm_add_rm_ftz_f",
@@ -4522,6 +4539,7 @@ match name {
     "llvm.nvvm.ex2.approx.d" => "__nvvm_ex2_approx_d",
     "llvm.nvvm.ex2.approx.f" => "__nvvm_ex2_approx_f",
     "llvm.nvvm.ex2.approx.ftz.f" => "__nvvm_ex2_approx_ftz_f",
+    "llvm.nvvm.exit" => "__nvvm_exit",
     "llvm.nvvm.f2bf16.rn" => "__nvvm_f2bf16_rn",
     "llvm.nvvm.f2bf16.rn.relu" => "__nvvm_f2bf16_rn_relu",
     "llvm.nvvm.f2bf16.rz" => "__nvvm_f2bf16_rz",
@@ -4722,8 +4740,11 @@ match name {
     "llvm.nvvm.mul24.ui" => "__nvvm_mul24_ui",
     "llvm.nvvm.mulhi.i" => "__nvvm_mulhi_i",
     "llvm.nvvm.mulhi.ll" => "__nvvm_mulhi_ll",
+    "llvm.nvvm.mulhi.s" => "__nvvm_mulhi_s",
     "llvm.nvvm.mulhi.ui" => "__nvvm_mulhi_ui",
     "llvm.nvvm.mulhi.ull" => "__nvvm_mulhi_ull",
+    "llvm.nvvm.mulhi.us" => "__nvvm_mulhi_us",
+    "llvm.nvvm.nanosleep" => "__nvvm_nanosleep",
     "llvm.nvvm.neg.bf16" => "__nvvm_neg_bf16",
     "llvm.nvvm.neg.bf16x2" => "__nvvm_neg_bf16x2",
     "llvm.nvvm.popc.i" => "__nvvm_popc_i",
@@ -4783,6 +4804,7 @@ match name {
     "llvm.nvvm.read.ptx.sreg.envreg7" => "__nvvm_read_ptx_sreg_envreg7",
     "llvm.nvvm.read.ptx.sreg.envreg8" => "__nvvm_read_ptx_sreg_envreg8",
     "llvm.nvvm.read.ptx.sreg.envreg9" => "__nvvm_read_ptx_sreg_envreg9",
+    "llvm.nvvm.read.ptx.sreg.globaltimer" => "__nvvm_read_ptx_sreg_globaltimer",
     "llvm.nvvm.read.ptx.sreg.gridid" => "__nvvm_read_ptx_sreg_gridid",
     // [DUPLICATE]: "llvm.nvvm.read.ptx.sreg.gridid" => "__nvvm_read_ptx_sreg_",
     "llvm.nvvm.read.ptx.sreg.laneid" => "__nvvm_read_ptx_sreg_laneid",
@@ -4835,6 +4857,7 @@ match name {
     "llvm.nvvm.redux.sync.umax" => "__nvvm_redux_sync_umax",
     "llvm.nvvm.redux.sync.umin" => "__nvvm_redux_sync_umin",
     "llvm.nvvm.redux.sync.xor" => "__nvvm_redux_sync_xor",
+    "llvm.nvvm.reflect" => "__nvvm_reflect",
     "llvm.nvvm.rotate.b32" => "__nvvm_rotate_b32",
     "llvm.nvvm.rotate.b64" => "__nvvm_rotate_b64",
     "llvm.nvvm.rotate.right.b64" => "__nvvm_rotate_right_b64",
@@ -4845,7 +4868,11 @@ match name {
     "llvm.nvvm.rsqrt.approx.f" => "__nvvm_rsqrt_approx_f",
     "llvm.nvvm.rsqrt.approx.ftz.f" => "__nvvm_rsqrt_approx_ftz_f",
     "llvm.nvvm.sad.i" => "__nvvm_sad_i",
+    "llvm.nvvm.sad.ll" => "__nvvm_sad_ll",
+    "llvm.nvvm.sad.s" => "__nvvm_sad_s",
     "llvm.nvvm.sad.ui" => "__nvvm_sad_ui",
+    "llvm.nvvm.sad.ull" => "__nvvm_sad_ull",
+    "llvm.nvvm.sad.us" => "__nvvm_sad_us",
     "llvm.nvvm.saturate.d" => "__nvvm_saturate_d",
     "llvm.nvvm.saturate.f" => "__nvvm_saturate_f",
     "llvm.nvvm.saturate.ftz.f" => "__nvvm_saturate_ftz_f",
@@ -5471,6 +5498,7 @@ match name {
     "llvm.ppc.fctiwz" => "__builtin_ppc_fctiwz",
     "llvm.ppc.fctudz" => "__builtin_ppc_fctudz",
     "llvm.ppc.fctuwz" => "__builtin_ppc_fctuwz",
+    "llvm.ppc.fence" => "__builtin_ppc_fence",
     "llvm.ppc.fmaf128.round.to.odd" => "__builtin_fmaf128_round_to_odd",
     "llvm.ppc.fmsub" => "__builtin_ppc_fmsub",
     "llvm.ppc.fmsubs" => "__builtin_ppc_fmsubs",
@@ -5599,6 +5627,9 @@ match name {
     "llvm.ppc.qpx.qvstfs" => "__builtin_qpx_qvstfs",
     "llvm.ppc.qpx.qvstfsa" => "__builtin_qpx_qvstfsa",
     "llvm.ppc.readflm" => "__builtin_readflm",
+    "llvm.ppc.rldimi" => "__builtin_ppc_rldimi",
+    "llvm.ppc.rlwimi" => "__builtin_ppc_rlwimi",
+    "llvm.ppc.rlwnm" => "__builtin_ppc_rlwnm",
     "llvm.ppc.scalar.extract.expq" => "__builtin_vsx_scalar_extract_expq",
     "llvm.ppc.scalar.insert.exp.qp" => "__builtin_vsx_scalar_insert_exp_qp",
     "llvm.ppc.set.texasr" => "__builtin_set_texasr",
@@ -5912,6 +5943,8 @@ match name {
     "llvm.s390.vupllb" => "__builtin_s390_vupllb",
     "llvm.s390.vupllf" => "__builtin_s390_vupllf",
     "llvm.s390.vupllh" => "__builtin_s390_vupllh",
+    // spv
+    "llvm.spv.create.handle" => "__builtin_hlsl_create_handle",
     // ve
     "llvm.ve.vl.andm.MMM" => "__builtin_ve_vl_andm_MMM",
     "llvm.ve.vl.andm.mmm" => "__builtin_ve_vl_andm_mmm",

compiler/rustc_codegen_gcc/src/intrinsic/llvm.rs

@@ -15,7 +15,7 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
     // Some LLVM intrinsics do not map 1-to-1 to GCC intrinsics, so we add the missing
     // arguments here.
     if gcc_func.get_param_count() != args.len() {
-        match &*func_name {
+        match func_name {
             // NOTE: the following intrinsics have a different number of parameters in LLVM and GCC.
             "__builtin_ia32_prold512_mask"
             | "__builtin_ia32_pmuldq512_mask"
@@ -380,7 +380,7 @@ pub fn adjust_intrinsic_arguments<'a, 'b, 'gcc, 'tcx>(
             _ => (),
         }
     } else {
-        match &*func_name {
+        match func_name {
             "__builtin_ia32_rndscaless_mask_round" | "__builtin_ia32_rndscalesd_mask_round" => {
                 let new_args = args.to_vec();
                 let arg3_type = gcc_func.get_param_type(2);
@@ -629,17 +629,22 @@ pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function
 
 #[cfg(feature = "master")]
 pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function<'gcc> {
-    match name {
+    let gcc_name = match name {
         "llvm.prefetch" => {
             let gcc_name = "__builtin_prefetch";
             let func = cx.context.get_builtin_function(gcc_name);
             cx.functions.borrow_mut().insert(gcc_name.to_string(), func);
             return func;
         }
-        _ => (),
-    }
 
-    let gcc_name = match name {
+        "llvm.aarch64.isb" => {
+            // FIXME: GCC doesn't support __builtin_arm_isb yet, check if this builtin is OK.
+            let gcc_name = "__atomic_thread_fence";
+            let func = cx.context.get_builtin_function(gcc_name);
+            cx.functions.borrow_mut().insert(gcc_name.to_string(), func);
+            return func;
+        }
+
         "llvm.x86.xgetbv" => "__builtin_ia32_xgetbv",
         // NOTE: this doc specifies the equivalent GCC builtins: http://huonw.github.io/llvmint/llvmint/x86/index.html
         "llvm.sqrt.v2f64" => "__builtin_ia32_sqrtpd",

compiler/rustc_codegen_gcc/src/intrinsic/mod.rs

@@ -91,7 +91,7 @@ fn get_simple_intrinsic<'gcc, 'tcx>(
         sym::abort => "abort",
         _ => return None,
     };
-    Some(cx.context.get_builtin_function(&gcc_name))
+    Some(cx.context.get_builtin_function(gcc_name))
 }
 
 impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
@@ -122,10 +122,17 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
 
         let simple = get_simple_intrinsic(self, name);
+
+        // FIXME(tempdragon): Re-enable `clippy::suspicious_else_formatting` if the following issue is solved:
+        // https://github.com/rust-lang/rust-clippy/issues/12497
+        // and leave `else if use_integer_compare` to be placed "as is".
+        #[allow(clippy::suspicious_else_formatting)]
         let llval = match name {
             _ if simple.is_some() => {
                 // FIXME(antoyo): remove this cast when the API supports function.
-                let func = unsafe { std::mem::transmute(simple.expect("simple")) };
+                let func = unsafe {
+                    std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(simple.expect("simple"))
+                };
                 self.call(
                     self.type_void(),
                     None,
@@ -167,7 +174,7 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
             sym::volatile_load | sym::unaligned_volatile_load => {
                 let tp_ty = fn_args.type_at(0);
                 let ptr = args[0].immediate();
-                let load = if let PassMode::Cast { cast: ty, pad_i32: _ } = &fn_abi.ret.mode {
+                let load = if let PassMode::Cast { cast: ref ty, pad_i32: _ } = fn_abi.ret.mode {
                     let gcc_ty = ty.gcc_type(self);
                     self.volatile_load(gcc_ty, ptr)
                 } else {
@@ -213,12 +220,12 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                             let after_block = func.new_block("after");
 
                             let arg = args[0].immediate();
-                            let result = func.new_local(None, arg.get_type(), "zeros");
+                            let result = func.new_local(None, self.u32_type, "zeros");
                             let zero = self.cx.gcc_zero(arg.get_type());
                             let cond = self.gcc_icmp(IntPredicate::IntEQ, arg, zero);
                             self.llbb().end_with_conditional(None, cond, then_block, else_block);
 
-                            let zero_result = self.cx.gcc_uint(arg.get_type(), width);
+                            let zero_result = self.cx.gcc_uint(self.u32_type, width);
                             then_block.add_assignment(None, result, zero_result);
                             then_block.end_with_jump(None, after_block);
 
@@ -386,7 +393,7 @@ impl<'a, 'gcc, 'tcx> IntrinsicCallMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         };
 
         if !fn_abi.ret.is_ignore() {
-            if let PassMode::Cast { cast: ty, .. } = &fn_abi.ret.mode {
+            if let PassMode::Cast { cast: ref ty, .. } = fn_abi.ret.mode {
                 let ptr_llty = self.type_ptr_to(ty.gcc_type(self));
                 let ptr = self.pointercast(result.val.llval, ptr_llty);
                 self.store(llval, ptr, result.val.align);
@@ -592,7 +599,7 @@ fn int_type_width_signed<'gcc, 'tcx>(
     ty: Ty<'tcx>,
     cx: &CodegenCx<'gcc, 'tcx>,
 ) -> Option<(u64, bool)> {
-    match ty.kind() {
+    match *ty.kind() {
         ty::Int(t) => Some((
             match t {
                 rustc_middle::ty::IntTy::Isize => u64::from(cx.tcx.sess.target.pointer_width),
@@ -698,16 +705,17 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
     fn count_leading_zeroes(&mut self, width: u64, arg: RValue<'gcc>) -> RValue<'gcc> {
         // TODO(antoyo): use width?
         let arg_type = arg.get_type();
+        let result_type = self.u32_type;
         let count_leading_zeroes =
             // TODO(antoyo): write a new function Type::is_compatible_with(&Type) and use it here
             // instead of using is_uint().
-            if arg_type.is_uint(&self.cx) {
+            if arg_type.is_uint(self.cx) {
                 "__builtin_clz"
             }
-            else if arg_type.is_ulong(&self.cx) {
+            else if arg_type.is_ulong(self.cx) {
                 "__builtin_clzl"
             }
-            else if arg_type.is_ulonglong(&self.cx) {
+            else if arg_type.is_ulonglong(self.cx) {
                 "__builtin_clzll"
             }
             else if width == 128 {
@@ -755,7 +763,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
                 let res = self.context.new_array_access(self.location, result, index);
 
-                return self.gcc_int_cast(res.to_rvalue(), arg_type);
+                return self.gcc_int_cast(res.to_rvalue(), result_type);
             }
             else {
                 let count_leading_zeroes = self.context.get_builtin_function("__builtin_clzll");
@@ -763,17 +771,18 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
                 let diff = self.ulonglong_type.get_size() as i64 - arg_type.get_size() as i64;
                 let diff = self.context.new_rvalue_from_long(self.int_type, diff * 8);
                 let res = self.context.new_call(self.location, count_leading_zeroes, &[arg]) - diff;
-                return self.context.new_cast(self.location, res, arg_type);
+                return self.context.new_cast(self.location, res, result_type);
             };
         let count_leading_zeroes = self.context.get_builtin_function(count_leading_zeroes);
         let res = self.context.new_call(self.location, count_leading_zeroes, &[arg]);
-        self.context.new_cast(self.location, res, arg_type)
+        self.context.new_cast(self.location, res, result_type)
     }
 
     fn count_trailing_zeroes(&mut self, _width: u64, arg: RValue<'gcc>) -> RValue<'gcc> {
-        let result_type = arg.get_type();
+        let arg_type = arg.get_type();
-        let arg = if result_type.is_signed(self.cx) {
+        let result_type = self.u32_type;
-            let new_type = result_type.to_unsigned(self.cx);
+        let arg = if arg_type.is_signed(self.cx) {
+            let new_type = arg_type.to_unsigned(self.cx);
             self.gcc_int_cast(arg, new_type)
         } else {
             arg
@@ -782,17 +791,17 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
         let (count_trailing_zeroes, expected_type) =
             // TODO(antoyo): write a new function Type::is_compatible_with(&Type) and use it here
             // instead of using is_uint().
-            if arg_type.is_uchar(&self.cx) || arg_type.is_ushort(&self.cx) || arg_type.is_uint(&self.cx) {
+            if arg_type.is_uchar(self.cx) || arg_type.is_ushort(self.cx) || arg_type.is_uint(self.cx) {
                 // NOTE: we don't need to & 0xFF for uchar because the result is undefined on zero.
                 ("__builtin_ctz", self.cx.uint_type)
             }
-            else if arg_type.is_ulong(&self.cx) {
+            else if arg_type.is_ulong(self.cx) {
                 ("__builtin_ctzl", self.cx.ulong_type)
             }
-            else if arg_type.is_ulonglong(&self.cx) {
+            else if arg_type.is_ulonglong(self.cx) {
                 ("__builtin_ctzll", self.cx.ulonglong_type)
             }
-            else if arg_type.is_u128(&self.cx) {
+            else if arg_type.is_u128(self.cx) {
                 // Adapted from the algorithm to count leading zeroes from: https://stackoverflow.com/a/28433850/389119
                 let array_type = self.context.new_array_type(None, arg_type, 3);
                 let result = self.current_func()
@@ -863,18 +872,16 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
     fn pop_count(&mut self, value: RValue<'gcc>) -> RValue<'gcc> {
         // TODO(antoyo): use the optimized version with fewer operations.
-        let result_type = value.get_type();
+        let result_type = self.u32_type;
-        let value_type = result_type.to_unsigned(self.cx);
+        let arg_type = value.get_type();
+        let value_type = arg_type.to_unsigned(self.cx);
 
-        let value = if result_type.is_signed(self.cx) {
+        let value =
-            self.gcc_int_cast(value, value_type)
+            if arg_type.is_signed(self.cx) { self.gcc_int_cast(value, value_type) } else { value };
-        } else {
-            value
-        };
 
         // only break apart 128-bit ints if they're not natively supported
         // TODO(antoyo): remove this if/when native 128-bit integers land in libgccjit
-        if value_type.is_u128(&self.cx) && !self.cx.supports_128bit_integers {
+        if value_type.is_u128(self.cx) && !self.cx.supports_128bit_integers {
             let sixty_four = self.gcc_int(value_type, 64);
             let right_shift = self.gcc_lshr(value, sixty_four);
             let high = self.gcc_int_cast(right_shift, self.cx.ulonglong_type);
@@ -997,7 +1004,7 @@ impl<'a, 'gcc, 'tcx> Builder<'a, 'gcc, 'tcx> {
 
             // Return `result_type`'s maximum or minimum value on overflow
             // NOTE: convert the type to unsigned to have an unsigned shift.
-            let unsigned_type = result_type.to_unsigned(&self.cx);
+            let unsigned_type = result_type.to_unsigned(self.cx);
             let shifted = self.gcc_lshr(
                 self.gcc_int_cast(lhs, unsigned_type),
                 self.gcc_int(unsigned_type, width as i64 - 1),
@@ -1189,7 +1196,7 @@ fn codegen_gnu_try<'gcc>(
         bx.invoke(try_func_ty, None, None, try_func, &[data], then, catch, None, None);
     });
 
-    let func = unsafe { std::mem::transmute(func) };
+    let func = unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) };
 
     // Note that no invoke is used here because by definition this function
     // can't panic (that's what it's catching).
@@ -1263,7 +1270,7 @@ fn gen_fn<'a, 'gcc, 'tcx>(
     // FIXME(eddyb) find a nicer way to do this.
     cx.linkage.set(FunctionType::Internal);
     let func = cx.declare_fn(name, fn_abi);
-    let func_val = unsafe { std::mem::transmute(func) };
+    let func_val = unsafe { std::mem::transmute::<Function<'gcc>, RValue<'gcc>>(func) };
     cx.set_frame_pointer_type(func_val);
     cx.apply_target_cpu_attr(func_val);
     let block = Builder::append_block(cx, func_val, "entry-block");

compiler/rustc_codegen_gcc/src/intrinsic/simd.rs

@@ -13,6 +13,7 @@ use rustc_codegen_ssa::errors::InvalidMonomorphization;
 use rustc_codegen_ssa::mir::operand::OperandRef;
 use rustc_codegen_ssa::mir::place::PlaceRef;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, BuilderMethods};
+#[cfg(feature = "master")]
 use rustc_hir as hir;
 use rustc_middle::mir::BinOp;
 use rustc_middle::span_bug;
@@ -72,11 +73,11 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let expected_bytes = len / 8 + ((len % 8 > 0) as u64);
 
         let mask_ty = arg_tys[0];
-        let mut mask = match mask_ty.kind() {
+        let mut mask = match *mask_ty.kind() {
             ty::Int(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
             ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => args[0].immediate(),
             ty::Array(elem, len)
-                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                if matches!(*elem.kind(), ty::Uint(ty::UintTy::U8))
                     && len.try_eval_target_usize(bx.tcx, ty::ParamEnv::reveal_all())
                         == Some(expected_bytes) =>
             {
@@ -309,10 +310,9 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                 })
                 .collect();
             return Ok(bx.context.new_rvalue_from_vector(None, v_type, &elems));
-        } else {
-            // avoid the unnecessary truncation as an optimization.
-            return Ok(bx.context.new_bitcast(None, result, v_type));
         }
+        // avoid the unnecessary truncation as an optimization.
+        return Ok(bx.context.new_bitcast(None, result, v_type));
     }
     // since gcc doesn't have vector shuffle methods available in non-patched builds, fallback to
     // component-wise bitreverses if they're not available.
@@ -342,11 +342,13 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             .map(|i| {
                 let index = bx.context.new_rvalue_from_long(bx.i32_type, i as i64);
                 let value = bx.extract_element(vector, index).to_rvalue();
-                if name == sym::simd_ctlz {
+                let value_type = value.get_type();
-                    bx.count_leading_zeroes(value.get_type().get_size() as u64 * 8, value)
+                let element = if name == sym::simd_ctlz {
+                    bx.count_leading_zeroes(value_type.get_size() as u64 * 8, value)
                 } else {
-                    bx.count_trailing_zeroes(value.get_type().get_size() as u64 * 8, value)
+                    bx.count_trailing_zeroes(value_type.get_size() as u64 * 8, value)
-                }
+                };
+                bx.context.new_cast(None, element, value_type)
             })
             .collect();
         return Ok(bx.context.new_rvalue_from_vector(None, vector.get_type(), &elements));
@@ -355,8 +357,8 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     if name == sym::simd_shuffle {
         // Make sure this is actually an array, since typeck only checks the length-suffixed
         // version of this intrinsic.
-        let n: u64 = match args[2].layout.ty.kind() {
+        let n: u64 = match *args[2].layout.ty.kind() {
-            ty::Array(ty, len) if matches!(ty.kind(), ty::Uint(ty::UintTy::U32)) => {
+            ty::Array(ty, len) if matches!(*ty.kind(), ty::Uint(ty::UintTy::U32)) => {
                 len.try_eval_target_usize(bx.cx.tcx, ty::ParamEnv::reveal_all()).unwrap_or_else(
                     || span_bug!(span, "could not evaluate shuffle index array length"),
                 )
@@ -429,13 +431,148 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             m_len == v_len,
             InvalidMonomorphization::MismatchedLengths { span, name, m_len, v_len }
         );
-        match m_elem_ty.kind() {
+        match *m_elem_ty.kind() {
             ty::Int(_) => {}
             _ => return_error!(InvalidMonomorphization::MaskType { span, name, ty: m_elem_ty }),
         }
         return Ok(bx.vector_select(args[0].immediate(), args[1].immediate(), args[2].immediate()));
     }
 
+    if name == sym::simd_cast_ptr {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::RawPtr(p_ty, _) => {
+                let metadata = p_ty.ptr_metadata_ty(bx.tcx, |ty| {
+                    bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
+                });
+                require!(
+                    metadata.is_unit(),
+                    InvalidMonomorphization::CastFatPointer { span, name, ty: in_elem }
+                );
+            }
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: in_elem })
+            }
+        }
+        match *out_elem.kind() {
+            ty::RawPtr(p_ty, _) => {
+                let metadata = p_ty.ptr_metadata_ty(bx.tcx, |ty| {
+                    bx.tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), ty)
+                });
+                require!(
+                    metadata.is_unit(),
+                    InvalidMonomorphization::CastFatPointer { span, name, ty: out_elem }
+                );
+            }
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: out_elem })
+            }
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.pointercast(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
+    if name == sym::simd_expose_provenance {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::RawPtr(_, _) => {}
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: in_elem })
+            }
+        }
+        match *out_elem.kind() {
+            ty::Uint(ty::UintTy::Usize) => {}
+            _ => return_error!(InvalidMonomorphization::ExpectedUsize { span, name, ty: out_elem }),
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.ptrtoint(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
+    if name == sym::simd_with_exposed_provenance {
+        require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
+        let (out_len, out_elem) = ret_ty.simd_size_and_type(bx.tcx());
+
+        require!(
+            in_len == out_len,
+            InvalidMonomorphization::ReturnLengthInputType {
+                span,
+                name,
+                in_len,
+                in_ty,
+                ret_ty,
+                out_len
+            }
+        );
+
+        match *in_elem.kind() {
+            ty::Uint(ty::UintTy::Usize) => {}
+            _ => return_error!(InvalidMonomorphization::ExpectedUsize { span, name, ty: in_elem }),
+        }
+        match *out_elem.kind() {
+            ty::RawPtr(_, _) => {}
+            _ => {
+                return_error!(InvalidMonomorphization::ExpectedPointer { span, name, ty: out_elem })
+            }
+        }
+
+        let arg = args[0].immediate();
+        let elem_type = llret_ty.dyncast_vector().expect("vector return type").get_element_type();
+        let values: Vec<_> = (0..in_len)
+            .map(|i| {
+                let idx = bx.gcc_int(bx.usize_type, i as _);
+                let value = bx.extract_element(arg, idx);
+                bx.inttoptr(value, elem_type)
+            })
+            .collect();
+        return Ok(bx.context.new_rvalue_from_vector(bx.location, llret_ty, &values));
+    }
+
     #[cfg(feature = "master")]
     if name == sym::simd_cast || name == sym::simd_as {
         require_simd!(ret_ty, InvalidMonomorphization::SimdReturn { span, name, ty: ret_ty });
@@ -462,13 +599,13 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             Unsupported,
         }
 
-        let in_style = match in_elem.kind() {
+        let in_style = match *in_elem.kind() {
             ty::Int(_) | ty::Uint(_) => Style::Int,
             ty::Float(_) => Style::Float,
             _ => Style::Unsupported,
         };
 
-        let out_style = match out_elem.kind() {
+        let out_style = match *out_elem.kind() {
             ty::Int(_) | ty::Uint(_) => Style::Int,
             ty::Float(_) => Style::Float,
             _ => Style::Unsupported,
@@ -495,7 +632,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     macro_rules! arith_binary {
         ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
             $(if name == sym::$name {
-                match in_elem.kind() {
+                match *in_elem.kind() {
                     $($(ty::$p(_))|* => {
                         return Ok(bx.$call(args[0].immediate(), args[1].immediate()))
                     })*
@@ -533,7 +670,6 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let sign_shift = bx.context.new_rvalue_from_int(elem_type, elem_size as i32 - 1);
         let one = bx.context.new_rvalue_one(elem_type);
 
-        let mut shift = 0;
         for i in 0..in_len {
             let elem =
                 bx.extract_element(vector, bx.context.new_rvalue_from_int(bx.int_type, i as i32));
@@ -541,17 +677,16 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
             let masked = shifted & one;
             result = result
                 | (bx.context.new_cast(None, masked, result_type)
-                    << bx.context.new_rvalue_from_int(result_type, shift));
+                    << bx.context.new_rvalue_from_int(result_type, i as i32));
-            shift += 1;
         }
 
-        match ret_ty.kind() {
+        match *ret_ty.kind() {
             ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => {
                 // Zero-extend iN to the bitmask type:
                 return Ok(result);
             }
             ty::Array(elem, len)
-                if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
+                if matches!(*elem.kind(), ty::Uint(ty::UintTy::U8))
                     && len.try_eval_target_usize(bx.tcx, ty::ParamEnv::reveal_all())
                         == Some(expected_bytes) =>
             {
@@ -590,7 +725,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                 return Err(());
             }};
         }
-        let (elem_ty_str, elem_ty) = if let ty::Float(f) = in_elem.kind() {
+        let (elem_ty_str, elem_ty) = if let ty::Float(ref f) = *in_elem.kind() {
             let elem_ty = bx.cx.type_float_from_ty(*f);
             match f.bit_width() {
                 32 => ("f", elem_ty),
@@ -816,7 +951,9 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         let (_, element_ty0) = arg_tys[0].simd_size_and_type(bx.tcx());
         let (_, element_ty1) = arg_tys[1].simd_size_and_type(bx.tcx());
         let (pointer_count, underlying_ty) = match *element_ty1.kind() {
-            ty::RawPtr(p_ty, _) if p_ty == in_elem => (ptr_count(element_ty1), non_ptr(element_ty1)),
+            ty::RawPtr(p_ty, _) if p_ty == in_elem => {
+                (ptr_count(element_ty1), non_ptr(element_ty1))
+            }
             _ => {
                 require!(
                     false,
@@ -839,7 +976,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
 
         // The element type of the third argument must be a signed integer type of any width:
         let (_, element_ty2) = arg_tys[2].simd_size_and_type(bx.tcx());
-        match element_ty2.kind() {
+        match *element_ty2.kind() {
             ty::Int(_) => (),
             _ => {
                 require!(
@@ -955,7 +1092,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
         assert_eq!(underlying_ty, non_ptr(element_ty0));
 
         // The element type of the third argument must be a signed integer type of any width:
-        match element_ty2.kind() {
+        match *element_ty2.kind() {
             ty::Int(_) => (),
             _ => {
                 require!(
@@ -1013,7 +1150,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
     macro_rules! arith_unary {
         ($($name: ident: $($($p: ident),* => $call: ident),*;)*) => {
             $(if name == sym::$name {
-                match in_elem.kind() {
+                match *in_elem.kind() {
                     $($(ty::$p(_))|* => {
                         return Ok(bx.$call(args[0].immediate()))
                     })*
@@ -1137,7 +1274,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     ret_ty == in_elem,
                     InvalidMonomorphization::ReturnType { span, name, in_elem, in_ty, ret_ty }
                 );
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => {
                         let r = bx.vector_reduce_op(args[0].immediate(), $vec_op);
                         if $ordered {
@@ -1206,7 +1343,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     ret_ty == in_elem,
                     InvalidMonomorphization::ReturnType { span, name, in_elem, in_ty, ret_ty }
                 );
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => Ok(bx.$int_red(args[0].immediate())),
                     ty::Float(_) => Ok(bx.$float_red(args[0].immediate())),
                     _ => return_error!(InvalidMonomorphization::UnsupportedSymbol {
@@ -1235,7 +1372,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
                     );
                     args[0].immediate()
                 } else {
-                    match in_elem.kind() {
+                    match *in_elem.kind() {
                         ty::Int(_) | ty::Uint(_) => {}
                         _ => return_error!(InvalidMonomorphization::UnsupportedSymbol {
                             span,
@@ -1249,7 +1386,7 @@ pub fn generic_simd_intrinsic<'a, 'gcc, 'tcx>(
 
                     args[0].immediate()
                 };
-                return match in_elem.kind() {
+                return match *in_elem.kind() {
                     ty::Int(_) | ty::Uint(_) => {
                         let r = bx.vector_reduce_op(input, $op);
                         Ok(if !$boolean {

compiler/rustc_codegen_gcc/src/lib.rs

@@ -4,7 +4,7 @@
  * TODO(antoyo): support LTO (gcc's equivalent to Full LTO is -flto -flto-partition=one — https://documentation.suse.com/sbp/all/html/SBP-GCC-10/index.html).
  * For Thin LTO, this might be helpful:
  * In gcc 4.6 -fwhopr was removed and became default with -flto. The non-whopr path can still be executed via -flto-partition=none.
- * Or the new incremental LTO?
+ * Or the new incremental LTO (https://www.phoronix.com/news/GCC-Incremental-LTO-Patches)?
  *
  * Maybe some missing optizations enabled by rustc's LTO is in there: https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
  * Like -fipa-icf (should be already enabled) and maybe -fdevirtualize-at-ltrans.
@@ -16,12 +16,13 @@
 #![allow(internal_features)]
 #![doc(rust_logo)]
 #![feature(rustdoc_internals)]
-#![feature(rustc_private, decl_macro, never_type, trusted_len, hash_raw_entry)]
+#![feature(rustc_private, decl_macro, never_type, trusted_len, hash_raw_entry, let_chains)]
 #![allow(broken_intra_doc_links)]
 #![recursion_limit = "256"]
 #![warn(rust_2018_idioms)]
 #![warn(unused_lifetimes)]
 #![deny(clippy::pattern_type_mismatch)]
+#![allow(clippy::needless_lifetimes)]
 
 extern crate rustc_apfloat;
 extern crate rustc_ast;
@@ -73,6 +74,7 @@ mod type_of;
 
 use std::any::Any;
 use std::fmt::Debug;
+use std::ops::Deref;
 #[cfg(not(feature = "master"))]
 use std::sync::atomic::AtomicBool;
 #[cfg(not(feature = "master"))]
@@ -80,8 +82,9 @@ use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::sync::Mutex;
 
+use back::lto::ThinBuffer;
+use back::lto::ThinData;
 use errors::LTONotSupported;
-#[cfg(not(feature = "master"))]
 use gccjit::CType;
 use gccjit::{Context, OptimizationLevel};
 #[cfg(feature = "master")]
@@ -92,9 +95,7 @@ use rustc_codegen_ssa::back::write::{
     CodegenContext, FatLtoInput, ModuleConfig, TargetMachineFactoryFn,
 };
 use rustc_codegen_ssa::base::codegen_crate;
-use rustc_codegen_ssa::traits::{
+use rustc_codegen_ssa::traits::{CodegenBackend, ExtraBackendMethods, WriteBackendMethods};
-    CodegenBackend, ExtraBackendMethods, ThinBufferMethods, WriteBackendMethods,
-};
 use rustc_codegen_ssa::{CodegenResults, CompiledModule, ModuleCodegen};
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_data_structures::sync::IntoDynSyncSend;
@@ -139,6 +140,10 @@ impl TargetInfo {
     fn supports_128bit_int(&self) -> bool {
         self.supports_128bit_integers.load(Ordering::SeqCst)
     }
+
+    fn supports_target_dependent_type(&self, _typ: CType) -> bool {
+        false
+    }
 }
 
 #[derive(Clone)]
@@ -160,6 +165,10 @@ impl LockedTargetInfo {
     fn supports_128bit_int(&self) -> bool {
         self.info.lock().expect("lock").supports_128bit_int()
     }
+
+    fn supports_target_dependent_type(&self, typ: CType) -> bool {
+        self.info.lock().expect("lock").supports_target_dependent_type(typ)
+    }
 }
 
 #[derive(Clone)]
@@ -188,6 +197,7 @@ impl CodegenBackend for GccCodegenBackend {
 
         #[cfg(feature = "master")]
         gccjit::set_global_personality_function_name(b"rust_eh_personality\0");
+
         if sess.lto() == Lto::Thin {
             sess.dcx().emit_warn(LTONotSupported {});
         }
@@ -293,7 +303,7 @@ impl ExtraBackendMethods for GccCodegenBackend {
         alloc_error_handler_kind: AllocatorKind,
     ) -> Self::Module {
         let mut mods = GccContext {
-            context: new_context(tcx),
+            context: Arc::new(SyncContext::new(new_context(tcx))),
             should_combine_object_files: false,
             temp_dir: None,
         };
@@ -323,35 +333,42 @@ impl ExtraBackendMethods for GccCodegenBackend {
     }
 }
 
-pub struct ThinBuffer;
-
-impl ThinBufferMethods for ThinBuffer {
-    fn data(&self) -> &[u8] {
-        unimplemented!();
-    }
-
-    fn thin_link_data(&self) -> &[u8] {
-        unimplemented!();
-    }
-}
-
 pub struct GccContext {
-    context: Context<'static>,
+    context: Arc<SyncContext>,
     should_combine_object_files: bool,
     // Temporary directory used by LTO. We keep it here so that it's not removed before linking.
     temp_dir: Option<TempDir>,
 }
 
-unsafe impl Send for GccContext {}
+struct SyncContext {
-// FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm". Try to disable it here.
+    context: Context<'static>,
-unsafe impl Sync for GccContext {}
+}
+
+impl SyncContext {
+    fn new(context: Context<'static>) -> Self {
+        Self { context }
+    }
+}
+
+impl Deref for SyncContext {
+    type Target = Context<'static>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.context
+    }
+}
+
+unsafe impl Send for SyncContext {}
+// FIXME(antoyo): that shouldn't be Sync. Parallel compilation is currently disabled with "-Zno-parallel-llvm".
+// TODO: disable it here by returing false in CodegenBackend::supports_parallel().
+unsafe impl Sync for SyncContext {}
 
 impl WriteBackendMethods for GccCodegenBackend {
     type Module = GccContext;
     type TargetMachine = ();
     type TargetMachineError = ();
     type ModuleBuffer = ModuleBuffer;
-    type ThinData = ();
+    type ThinData = ThinData;
     type ThinBuffer = ThinBuffer;
 
     fn run_fat_lto(
@@ -363,11 +380,11 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     fn run_thin_lto(
-        _cgcx: &CodegenContext<Self>,
+        cgcx: &CodegenContext<Self>,
-        _modules: Vec<(String, Self::ThinBuffer)>,
+        modules: Vec<(String, Self::ThinBuffer)>,
-        _cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
+        cached_modules: Vec<(SerializedModule<Self::ModuleBuffer>, WorkProduct)>,
     ) -> Result<(Vec<LtoModuleCodegen<Self>>, Vec<WorkProduct>), FatalError> {
-        unimplemented!();
+        back::lto::run_thin(cgcx, modules, cached_modules)
     }
 
     fn print_pass_timings(&self) {
@@ -397,10 +414,10 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     unsafe fn optimize_thin(
-        _cgcx: &CodegenContext<Self>,
+        cgcx: &CodegenContext<Self>,
-        _thin: ThinModule<Self>,
+        thin: ThinModule<Self>,
     ) -> Result<ModuleCodegen<Self::Module>, FatalError> {
-        unimplemented!();
+        back::lto::optimize_thin_module(thin, cgcx)
     }
 
     unsafe fn codegen(
@@ -413,10 +430,10 @@ impl WriteBackendMethods for GccCodegenBackend {
     }
 
     fn prepare_thin(
-        _module: ModuleCodegen<Self::Module>,
+        module: ModuleCodegen<Self::Module>,
-        _emit_summary: bool,
+        emit_summary: bool,
     ) -> (String, Self::ThinBuffer) {
-        unimplemented!();
+        back::lto::prepare_thin(module, emit_summary)
     }
 
     fn serialize_module(_module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
@@ -437,7 +454,8 @@ impl WriteBackendMethods for GccCodegenBackend {
 pub fn __rustc_codegen_backend() -> Box<dyn CodegenBackend> {
     #[cfg(feature = "master")]
     let info = {
-        // Check whether the target supports 128-bit integers.
+        // Check whether the target supports 128-bit integers, and sized floating point types (like
+        // Float16).
         let context = Context::default();
         Arc::new(Mutex::new(IntoDynSyncSend(context.get_target_info())))
     };
@@ -467,6 +485,7 @@ pub fn target_features(
     allow_unstable: bool,
     target_info: &LockedTargetInfo,
 ) -> Vec<Symbol> {
+    // TODO(antoyo): use global_gcc_features.
     sess.target
         .supported_target_features()
         .iter()
@@ -477,8 +496,12 @@ pub fn target_features(
                 None
             }
         })
-        .filter(|_feature| {
+        .filter(|feature| {
-            target_info.cpu_supports(_feature)
+            // TODO: we disable Neon for now since we don't support the LLVM intrinsics for it.
+            if *feature == "neon" {
+                return false;
+            }
+            target_info.cpu_supports(feature)
             /*
               adx, aes, avx, avx2, avx512bf16, avx512bitalg, avx512bw, avx512cd, avx512dq, avx512er, avx512f, avx512fp16, avx512ifma,
               avx512pf, avx512vbmi, avx512vbmi2, avx512vl, avx512vnni, avx512vp2intersect, avx512vpopcntdq,

compiler/rustc_codegen_gcc/src/mono_item.rs

@@ -81,6 +81,6 @@ impl<'gcc, 'tcx> PreDefineMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         // TODO(antoyo): use inline attribute from there in linkage.set() above.
 
         self.functions.borrow_mut().insert(symbol_name.to_string(), decl);
-        self.function_instances.borrow_mut().insert(instance, unsafe { std::mem::transmute(decl) });
+        self.function_instances.borrow_mut().insert(instance, decl);
     }
 }

compiler/rustc_codegen_gcc/src/type_.rs

@@ -1,3 +1,8 @@
+#[cfg(feature = "master")]
+use std::convert::TryInto;
+
+#[cfg(feature = "master")]
+use gccjit::CType;
 use gccjit::{RValue, Struct, Type};
 use rustc_codegen_ssa::common::TypeKind;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, DerivedTypeMethods, TypeMembershipMethods};
@@ -142,25 +147,76 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
     }
 
     fn type_f16(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        #[cfg(feature = "master")]
+        if self.supports_f16_type {
+            return self.context.new_c_type(CType::Float16);
+        }
+        bug!("unsupported float width 16")
     }
 
     fn type_f32(&self) -> Type<'gcc> {
+        #[cfg(feature = "master")]
+        if self.supports_f32_type {
+            return self.context.new_c_type(CType::Float32);
+        }
         self.float_type
     }
 
     fn type_f64(&self) -> Type<'gcc> {
+        #[cfg(feature = "master")]
+        if self.supports_f64_type {
+            return self.context.new_c_type(CType::Float64);
+        }
         self.double_type
     }
 
     fn type_f128(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        #[cfg(feature = "master")]
+        if self.supports_f128_type {
+            return self.context.new_c_type(CType::Float128);
+        }
+        bug!("unsupported float width 128")
     }
 
     fn type_func(&self, params: &[Type<'gcc>], return_type: Type<'gcc>) -> Type<'gcc> {
         self.context.new_function_pointer_type(None, return_type, params, false)
     }
 
+    #[cfg(feature = "master")]
+    fn type_kind(&self, typ: Type<'gcc>) -> TypeKind {
+        if self.is_int_type_or_bool(typ) {
+            TypeKind::Integer
+        } else if typ.get_pointee().is_some() {
+            TypeKind::Pointer
+        } else if typ.is_vector() {
+            TypeKind::Vector
+        } else if typ.dyncast_array().is_some() {
+            TypeKind::Array
+        } else if typ.is_struct().is_some() {
+            TypeKind::Struct
+        } else if typ.dyncast_function_ptr_type().is_some() {
+            TypeKind::Function
+        } else if typ.is_compatible_with(self.float_type) {
+            TypeKind::Float
+        } else if typ.is_compatible_with(self.double_type) {
+            TypeKind::Double
+        } else if typ.is_floating_point() {
+            match typ.get_size() {
+                2 => TypeKind::Half,
+                4 => TypeKind::Float,
+                8 => TypeKind::Double,
+                16 => TypeKind::FP128,
+                size => unreachable!("Floating-point type of size {}", size),
+            }
+        } else if typ == self.type_void() {
+            TypeKind::Void
+        } else {
+            // TODO(antoyo): support other types.
+            unimplemented!();
+        }
+    }
+
+    #[cfg(not(feature = "master"))]
     fn type_kind(&self, typ: Type<'gcc>) -> TypeKind {
         if self.is_int_type_or_bool(typ) {
             TypeKind::Integer
@@ -170,9 +226,19 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
             TypeKind::Double
         } else if typ.is_vector() {
             TypeKind::Vector
+        } else if typ.get_pointee().is_some() {
+            TypeKind::Pointer
+        } else if typ.dyncast_array().is_some() {
+            TypeKind::Array
+        } else if typ.is_struct().is_some() {
+            TypeKind::Struct
+        } else if typ.dyncast_function_ptr_type().is_some() {
+            TypeKind::Function
+        } else if typ == self.type_void() {
+            TypeKind::Void
         } else {
             // TODO(antoyo): support other types.
-            TypeKind::Void
+            unimplemented!();
         }
     }
 
@@ -200,6 +266,16 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         unimplemented!();
     }
 
+    #[cfg(feature = "master")]
+    fn float_width(&self, typ: Type<'gcc>) -> usize {
+        if typ.is_floating_point() {
+            (typ.get_size() * u8::BITS).try_into().unwrap()
+        } else {
+            panic!("Cannot get width of float type {:?}", typ);
+        }
+    }
+
+    #[cfg(not(feature = "master"))]
     fn float_width(&self, typ: Type<'gcc>) -> usize {
         let f32 = self.context.new_type::<f32>();
         let f64 = self.context.new_type::<f64>();

compiler/rustc_codegen_gcc/src/type_of.rs

@@ -8,7 +8,7 @@ use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::{self, CoroutineArgsExt, Ty, TypeVisitableExt};
 use rustc_target::abi::call::{CastTarget, FnAbi, Reg};
 use rustc_target::abi::{
-    self, Abi, Align, FieldsShape, Float, Int, Integer, PointeeInfo, Pointer, Size, TyAbiInterface,
+    self, Abi, FieldsShape, Float, Int, Integer, PointeeInfo, Pointer, Size, TyAbiInterface,
     Variants,
 };
 
@@ -53,12 +53,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
     }
 }
 
-impl<'a, 'tcx> CodegenCx<'a, 'tcx> {
-    pub fn align_of(&self, ty: Ty<'tcx>) -> Align {
-        self.layout_of(ty).align.abi
-    }
-}
-
 fn uncached_gcc_type<'gcc, 'tcx>(
     cx: &CodegenCx<'gcc, 'tcx>,
     layout: TyAndLayout<'tcx>,
@@ -90,7 +84,7 @@ fn uncached_gcc_type<'gcc, 'tcx>(
         Abi::Uninhabited | Abi::Aggregate { .. } => {}
     }
 
-    let name = match layout.ty.kind() {
+    let name = match *layout.ty.kind() {
         // FIXME(eddyb) producing readable type names for trait objects can result
         // in problematically distinct types due to HRTB and subtyping (see #47638).
         // ty::Dynamic(..) |
@@ -220,7 +214,7 @@ impl<'tcx> LayoutGccExt<'tcx> for TyAndLayout<'tcx> {
                 // to fn_ptr_backend_type handle the on-stack attribute.
                 // TODO(antoyo): find a less hackish way to hande the on-stack attribute.
                 ty::FnPtr(sig) => {
-                    cx.fn_ptr_backend_type(&cx.fn_abi_of_fn_ptr(sig, ty::List::empty()))
+                    cx.fn_ptr_backend_type(cx.fn_abi_of_fn_ptr(sig, ty::List::empty()))
                 }
                 _ => self.scalar_gcc_type_at(cx, scalar, Size::ZERO),
             };

compiler/rustc_codegen_gcc/target_specs/m68k-unknown-linux-gnu.json

@@ -0,0 +1,26 @@
+{
+  "arch": "m68k",
+  "cpu": "M68020",
+  "crt-static-respected": true,
+  "data-layout": "E-m:e-p:32:16:32-i8:8:8-i16:16:16-i32:16:32-n8:16:32-a:0:16-S16",
+  "dynamic-linking": true,
+  "env": "gnu",
+  "has-rpath": true,
+  "has-thread-local": true,
+  "llvm-target": "m68k-unknown-linux-gnu",
+  "max-atomic-width": 32,
+  "os": "linux",
+  "position-independent-executables": true,
+  "relro-level": "full",
+  "supported-split-debuginfo": [
+    "packed",
+    "unpacked",
+    "off"
+  ],
+  "target-endian": "big",
+  "target-family": [
+    "unix"
+  ],
+  "target-mcount": "_mcount",
+  "target-pointer-width": "32"
+}

compiler/rustc_codegen_gcc/tests/failing-ice-tests.txt

@@ -0,0 +1,36 @@
+tests/ui/treat-err-as-bug/span_delayed_bug.rs
+tests/ui/treat-err-as-bug/err.rs
+tests/ui/simd/not-out-of-bounds.rs
+tests/ui/simd/monomorphize-shuffle-index.rs
+tests/ui/simd/masked-load-store-build-fail.rs
+tests/ui/simd/intrinsic/generic-shuffle.rs
+tests/ui/simd/intrinsic/generic-elements.rs
+tests/ui/simd/intrinsic/generic-cast.rs
+tests/ui/simd/intrinsic/generic-arithmetic-saturating-2.rs
+tests/ui/simd/intrinsic/generic-arithmetic-2.rs
+tests/ui/panics/default-backtrace-ice.rs
+tests/ui/mir/lint/storage-live.rs
+tests/ui/layout/valid_range_oob.rs
+tests/ui/higher-ranked/trait-bounds/future.rs
+tests/ui/consts/const-eval/const-eval-query-stack.rs
+tests/ui/simd/masked-load-store.rs
+tests/ui/simd/issue-39720.rs
+tests/ui/simd/intrinsic/ptr-cast.rs
+tests/ui/sepcomp/sepcomp-statics.rs
+tests/ui/sepcomp/sepcomp-fns.rs
+tests/ui/sepcomp/sepcomp-fns-backwards.rs
+tests/ui/sepcomp/sepcomp-extern.rs
+tests/ui/sepcomp/sepcomp-cci.rs
+tests/ui/lto/thin-lto-inlines2.rs
+tests/ui/lto/weak-works.rs
+tests/ui/lto/thin-lto-inlines.rs
+tests/ui/lto/thin-lto-global-allocator.rs
+tests/ui/lto/msvc-imp-present.rs
+tests/ui/lto/dylib-works.rs
+tests/ui/lto/all-crates.rs
+tests/ui/issues/issue-47364.rs
+tests/ui/functions-closures/parallel-codegen-closures.rs
+tests/ui/sepcomp/sepcomp-unwind.rs
+tests/ui/extern/issue-64655-extern-rust-must-allow-unwind.rs
+tests/ui/extern/issue-64655-allow-unwind-when-calling-panic-directly.rs
+tests/ui/unwind-no-uwtable.rs

compiler/rustc_codegen_gcc/tests/failing-lto-tests.txt

@@ -30,3 +30,4 @@ tests/ui/macros/rfc-2011-nicer-assert-messages/feature-gate-generic_assert.rs
 tests/ui/macros/stringify.rs
 tests/ui/reexport-test-harness-main.rs
 tests/ui/rfcs/rfc-1937-termination-trait/termination-trait-in-test.rs
+tests/ui/binding/fn-arg-incomplete-pattern-drop-order.rs

compiler/rustc_codegen_gcc/tests/failing-run-make-tests.txt

@@ -0,0 +1,42 @@
+tests/run-make/a-b-a-linker-guard/
+tests/run-make/CURRENT_RUSTC_VERSION/
+tests/run-make/cross-lang-lto/
+tests/run-make/cross-lang-lto-upstream-rlibs/
+tests/run-make/doctests-keep-binaries/
+tests/run-make/doctests-runtool/
+tests/run-make/emit-shared-files/
+tests/run-make/exit-code/
+tests/run-make/issue-22131/
+tests/run-make/issue-64153/
+tests/run-make/llvm-ident/
+tests/run-make/native-link-modifier-bundle/
+tests/run-make/remap-path-prefix-dwarf/
+tests/run-make/repr128-dwarf/
+tests/run-make/rlib-format-packed-bundled-libs/
+tests/run-make/rlib-format-packed-bundled-libs-2/
+tests/run-make/rustdoc-determinism/
+tests/run-make/rustdoc-error-lines/
+tests/run-make/rustdoc-map-file/
+tests/run-make/rustdoc-output-path/
+tests/run-make/rustdoc-scrape-examples-invalid-expr/
+tests/run-make/rustdoc-scrape-examples-multiple/
+tests/run-make/rustdoc-scrape-examples-ordering/
+tests/run-make/rustdoc-scrape-examples-remap/
+tests/run-make/rustdoc-scrape-examples-test/
+tests/run-make/rustdoc-scrape-examples-whitespace/
+tests/run-make/rustdoc-scrape-examples-macros/
+tests/run-make/rustdoc-with-out-dir-option/
+tests/run-make/rustdoc-verify-output-files/
+tests/run-make/rustdoc-themes/
+tests/run-make/rustdoc-with-short-out-dir-option/
+tests/run-make/rustdoc-with-output-option/
+tests/run-make/arguments-non-c-like-enum/
+tests/run-make/c-link-to-rust-staticlib/
+tests/run-make/foreign-double-unwind/
+tests/run-make/foreign-exceptions/
+tests/run-make/glibc-staticlib-args/
+tests/run-make/issue-36710/
+tests/run-make/issue-68794-textrel-on-minimal-lib/
+tests/run-make/lto-smoke-c/
+tests/run-make/return-non-c-like-enum/
+

compiler/rustc_codegen_gcc/tests/failing-ui-tests.txt

@@ -2,7 +2,6 @@ tests/ui/allocator/no_std-alloc-error-handler-custom.rs
 tests/ui/allocator/no_std-alloc-error-handler-default.rs
 tests/ui/asm/may_unwind.rs
 tests/ui/asm/x86_64/multiple-clobber-abi.rs
-tests/ui/debuginfo/debuginfo-emit-llvm-ir-and-split-debuginfo.rs
 tests/ui/functions-closures/parallel-codegen-closures.rs
 tests/ui/linkage-attr/linkage1.rs
 tests/ui/lto/dylib-works.rs
@@ -14,13 +13,12 @@ tests/ui/sepcomp/sepcomp-fns-backwards.rs
 tests/ui/sepcomp/sepcomp-fns.rs
 tests/ui/sepcomp/sepcomp-statics.rs
 tests/ui/asm/x86_64/may_unwind.rs
-tests/ui/backtrace.rs
 tests/ui/catch-unwind-bang.rs
-tests/ui/cfg/cfg-panic-abort.rs
 tests/ui/drop/dynamic-drop-async.rs
+tests/ui/cfg/cfg-panic-abort.rs
 tests/ui/drop/repeat-drop.rs
-tests/ui/fmt/format-args-capture.rs
 tests/ui/coroutine/panic-drops-resume.rs
+tests/ui/fmt/format-args-capture.rs
 tests/ui/coroutine/panic-drops.rs
 tests/ui/intrinsics/panic-uninitialized-zeroed.rs
 tests/ui/iterators/iter-sum-overflow-debug.rs
@@ -34,12 +32,8 @@ tests/ui/panic-runtime/abort.rs
 tests/ui/panic-runtime/link-to-abort.rs
 tests/ui/unwind-no-uwtable.rs
 tests/ui/parser/unclosed-delimiter-in-dep.rs
-tests/ui/runtime/rt-explody-panic-payloads.rs
-tests/ui/simd/intrinsic/ptr-cast.rs
-tests/ui/binding/fn-arg-incomplete-pattern-drop-order.rs
 tests/ui/consts/missing_span_in_backtrace.rs
 tests/ui/drop/dynamic-drop.rs
-tests/ui/dyn-star/box.rs
 tests/ui/issues/issue-40883.rs
 tests/ui/issues/issue-43853.rs
 tests/ui/issues/issue-47364.rs
@@ -48,29 +42,56 @@ tests/ui/rfcs/rfc-1857-stabilize-drop-order/drop-order.rs
 tests/ui/rfcs/rfc-2091-track-caller/std-panic-locations.rs
 tests/ui/simd/issue-17170.rs
 tests/ui/simd/issue-39720.rs
-tests/ui/statics/issue-91050-1.rs
-tests/ui/statics/issue-91050-2.rs
 tests/ui/alloc-error/default-alloc-error-hook.rs
 tests/ui/coroutine/panic-safe.rs
 tests/ui/issues/issue-14875.rs
 tests/ui/issues/issue-29948.rs
 tests/ui/panics/nested_panic_caught.rs
-tests/ui/const_prop/ice-issue-111353.rs
 tests/ui/process/println-with-broken-pipe.rs
-tests/ui/panic-runtime/lto-abort.rs
 tests/ui/lto/thin-lto-inlines2.rs
 tests/ui/lto/weak-works.rs
+tests/ui/panic-runtime/lto-abort.rs 
 tests/ui/lto/thin-lto-inlines.rs
 tests/ui/lto/thin-lto-global-allocator.rs
 tests/ui/lto/msvc-imp-present.rs
 tests/ui/lto/lto-thin-rustc-loads-linker-plugin.rs
 tests/ui/lto/all-crates.rs
 tests/ui/async-await/deep-futures-are-freeze.rs
-tests/ui/closures/capture-unsized-by-ref.rs
 tests/ui/coroutine/resume-after-return.rs
-tests/ui/macros/rfc-2011-nicer-assert-messages/all-expr-kinds.rs
 tests/ui/simd/masked-load-store.rs
 tests/ui/simd/repr_packed.rs
 tests/ui/async-await/in-trait/dont-project-to-specializable-projection.rs
 tests/ui/consts/try-operator.rs
 tests/ui/coroutine/unwind-abort-mix.rs
+tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
+tests/ui/impl-trait/equality-in-canonical-query.rs
+tests/ui/consts/issue-miri-1910.rs
+tests/ui/mir/mir_heavy_promoted.rs
+tests/ui/consts/const_cmp_type_id.rs
+tests/ui/consts/issue-73976-monomorphic.rs
+tests/ui/consts/issue-94675.rs
+tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop-fail.rs
+tests/ui/rfcs/rfc-2632-const-trait-impl/const-drop.rs
+tests/ui/runtime/on-broken-pipe/child-processes.rs
+tests/ui/sanitizer/cfi-assoc-ty-lifetime-issue-123053.rs
+tests/ui/sanitizer/cfi-async-closures.rs
+tests/ui/sanitizer/cfi-closures.rs
+tests/ui/sanitizer/cfi-complex-receiver.rs
+tests/ui/sanitizer/cfi-coroutine.rs
+tests/ui/sanitizer/cfi-drop-in-place.rs
+tests/ui/sanitizer/cfi-drop-no-principal.rs
+tests/ui/sanitizer/cfi-fn-ptr.rs
+tests/ui/sanitizer/cfi-self-ref.rs
+tests/ui/sanitizer/cfi-supertraits.rs
+tests/ui/sanitizer/cfi-virtual-auto.rs
+tests/ui/sanitizer/kcfi-mangling.rs
+tests/ui/statics/const_generics.rs
+tests/ui/backtrace/dylib-dep.rs
+tests/ui/errors/pic-linker.rs
+tests/ui/delegation/fn-header.rs
+tests/ui/consts/zst_no_llvm_alloc.rs
+tests/ui/consts/const-eval/parse_ints.rs
+tests/ui/simd/intrinsic/generic-arithmetic-pass.rs
+tests/ui/backtrace/backtrace.rs
+tests/ui/lifetimes/tail-expr-lock-poisoning.rs
+tests/ui/runtime/rt-explody-panic-payloads.rs

compiler/rustc_codegen_gcc/tests/hello-world/Cargo.toml

@@ -0,0 +1,4 @@
+[package]
+name = "hello_world"
+
+[dependencies]

compiler/rustc_codegen_gcc/tests/hello-world/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

compiler/rustc_codegen_gcc/tests/lang_tests_common.rs

@@ -80,8 +80,7 @@ pub fn main_inner(profile: Profile) {
             compiler.args([
                 &format!("-Zcodegen-backend={}/target/debug/librustc_codegen_gcc.so", current_dir),
                 "--sysroot",
-                &format!("{}/build_sysroot/sysroot/", current_dir),
+                &format!("{}/build/build_sysroot/sysroot/", current_dir),
-                "-Zno-parallel-llvm",
                 "-C",
                 "link-arg=-lc",
                 "-o",

compiler/rustc_codegen_gcc/tests/run/array.rs

@@ -205,6 +205,17 @@ impl Sub for i16 {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_sub_overflow"]
+pub fn panic_const_sub_overflow() -> ! {
+    panic("attempt to subtract with overflow");
+}
 
 /*
  * Code

compiler/rustc_codegen_gcc/tests/run/assign.rs

@@ -120,6 +120,12 @@ impl Add for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */

compiler/rustc_codegen_gcc/tests/run/closure.rs

@@ -189,6 +189,12 @@ pub fn panic(_msg: &'static str) -> ! {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */

compiler/rustc_codegen_gcc/tests/run/mut_ref.rs

@@ -122,6 +122,12 @@ impl Add for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
 /*
  * Code
  */

compiler/rustc_codegen_gcc/tests/run/operations.rs

@@ -207,6 +207,24 @@ impl Mul for isize {
     }
 }
 
+#[track_caller]
+#[lang = "panic_const_add_overflow"]
+pub fn panic_const_add_overflow() -> ! {
+    panic("attempt to add with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_sub_overflow"]
+pub fn panic_const_sub_overflow() -> ! {
+    panic("attempt to subtract with overflow");
+}
+
+#[track_caller]
+#[lang = "panic_const_mul_overflow"]
+pub fn panic_const_mul_overflow() -> ! {
+    panic("attempt to multiply with overflow");
+}
+
 /*
  * Code
  */