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Auto merge of #99464 - nikic:llvm-15, r=cuviper

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Update to LLVM 15

For preliminary testing. Some LLVM 15 compatibility fixes were applied separately in #99512.

Release timeline:
 * LLVM 15 branched on Jul 26.
 * The final LLVM 15.0.0 release is scheduled for Sep 6.
 * Current nightly (1.65.0) is scheduled for Nov 3.

Changes in this PR (apart from the LLVM update):
 * Pass `--set llvm.allow-old-toolchain` for many Docker images. LLVM 16 will require GCC >= 7.1, while LLVM 15 still allows older compilers with an option. Specify the option for builders still using GCC 5.4. #95026 updated some of the used toolchains, but not all.
 * Use the `+atomics-32` target feature for thumbv6m.
 * Explicitly link libatomic when cross-compiling LLVM to 32-bit target.
 * Explicitly disable zstd support, to avoid libzstd.so dependency.

New LLVM patches ([commits](https://github.com/rust-lang/llvm-project/commits/rustc/15.0-2022-08-09)):
 * [rust-only] Fix ICE with GCC 5.4 (15be58d7f0)
 * [rust-only] Fix build with GCC 5.4 (774edc10fa)
 * ~~[rust-only] Fix build with GCC 5.2 (1a6069a7bb)~~
 * ~~[rust-only] Fix ICE with GCC 5.2 (493081f290)~~
 * ~~[rust-only] Fix build with GCC 5.2 (0fc5979d73)~~
 * [backported] Addition of `+atomics` target feature (57bdd9892d).
 * [backported] Revert compiler-rt change that broke powerpc (9c68b43915)
 * [awaiting backport] Fix RelLookupTableConverter on gnux32 (639388a05f / https://github.com/llvm/llvm-project/issues/57021)

Tested images: dist-x86_64-linux, armhf-gnu, arm-android, dist-s390x-linux, dist-x86_64-illumos, dist-x86_64-freebsd, wasm32, dist-x86_64-musl, dist-various-1, dist-riscv64-linux, dist-mips-linux, dist-mipsel-linux, dist-powerpc-linux, dist-aarch64-linux, dist-x86_64-apple, x86_64-msvc-1, x86_64-msvc-2, dist-various-2, dist-arm-linux
Tested up to the usual ipv6 error: test-various, i686-gnu, x86_64-gnu-nopt

r? `@ghost`
This commit is contained in:
bors 2022-08-12 02:58:51 +00:00
commit e2b52ff73e
22 changed files with 73 additions and 28 deletions
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4
compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs
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@ -13,7 +13,9 @@ pub fn target() -> Target {
abi: "eabi".into(),
// The ARMv6-M architecture doesn't support unaligned loads/stores so we disable them
// with +strict-align.
features: "+strict-align".into(),
// Also force-enable 32-bit atomics, which allows the use of atomic load/store only.
// The resulting atomics are ABI incompatible with atomics backed by libatomic.
features: "+strict-align,+atomics-32".into(),
// There are no atomic CAS instructions available in the instruction set of the ARMv6-M
// architecture
atomic_cas: false,