From d30294e33c67a19a52f4d2b126c460dae2b87a8f Mon Sep 17 00:00:00 2001
From: "Jonathan Pallant (Ferrous Systems)"
 <jonathan.pallant@ferrous-systems.com>
Date: Fri, 7 Jul 2023 11:55:04 +0100
Subject: [PATCH] Add a sparc-unknown-none-elf target.

Tested with the Gaisler bcc2 toolchain (both gcc and clang) and the Leon3 simulator.
---
 compiler/rustc_target/src/spec/mod.rs         |  2 ++
 .../src/spec/sparc_unknown_none_elf.rs        | 27 +++++++++++++++++++
 src/doc/rustc/src/platform-support.md         |  1 +
 src/tools/build-manifest/src/main.rs          |  1 +
 4 files changed, 31 insertions(+)
 create mode 100644 compiler/rustc_target/src/spec/sparc_unknown_none_elf.rs

diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 2365dfaf1af..b6151658225 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1433,6 +1433,8 @@ supported_targets! {
     ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
     ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
 
+    ("sparc-unknown-none-elf", sparc_unknown_none_elf),
+
     ("loongarch64-unknown-none", loongarch64_unknown_none),
     ("loongarch64-unknown-none-softfloat", loongarch64_unknown_none_softfloat),
 
diff --git a/compiler/rustc_target/src/spec/sparc_unknown_none_elf.rs b/compiler/rustc_target/src/spec/sparc_unknown_none_elf.rs
new file mode 100644
index 00000000000..7e908a0f365
--- /dev/null
+++ b/compiler/rustc_target/src/spec/sparc_unknown_none_elf.rs
@@ -0,0 +1,27 @@
+use crate::abi::Endian;
+use crate::spec::{Cc, LinkerFlavor, Lld, PanicStrategy, RelocModel, Target, TargetOptions};
+
+pub fn target() -> Target {
+    let options = TargetOptions {
+        linker_flavor: LinkerFlavor::Gnu(Cc::Yes, Lld::No),
+        linker: Some("sparc-elf-gcc".into()),
+        endian: Endian::Big,
+        cpu: "v7".into(),
+        abi: "elf".into(),
+        max_atomic_width: Some(32),
+        atomic_cas: true,
+        panic_strategy: PanicStrategy::Abort,
+        relocation_model: RelocModel::Static,
+        no_default_libraries: false,
+        emit_debug_gdb_scripts: false,
+        eh_frame_header: false,
+        ..Default::default()
+    };
+    Target {
+        data_layout: "E-m:e-p:32:32-i64:64-f128:64-n32-S64".into(),
+        llvm_target: "sparc-unknown-none-elf".into(),
+        pointer_width: 32,
+        arch: "sparc".into(),
+        options,
+    }
+}
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index d2a25e612ec..d287cf7a5fe 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -176,6 +176,7 @@ target | std | notes
 `thumbv8m.base-none-eabi` | * | Bare ARMv8-M Baseline
 `thumbv8m.main-none-eabi` | * | Bare ARMv8-M Mainline
 `thumbv8m.main-none-eabihf` | * | Bare ARMv8-M Mainline, hardfloat
+`sparc-unknown-none-elf` | * | Bare 32-bit SPARC V7+
 `wasm32-unknown-emscripten` | ✓ | WebAssembly via Emscripten
 `wasm32-unknown-unknown` | ✓ | WebAssembly
 `wasm32-wasi` | ✓ | WebAssembly with WASI
diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index 8b28c68e04f..14618f89aed 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -127,6 +127,7 @@ static TARGETS: &[&str] = &[
     "s390x-unknown-linux-gnu",
     "sparc64-unknown-linux-gnu",
     "sparcv9-sun-solaris",
+    "sparc-unknown-none-elf",
     "thumbv6m-none-eabi",
     "thumbv7em-none-eabi",
     "thumbv7em-none-eabihf",