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bors e2b52ff73e Auto merge of #99464 - nikic:llvm-15, r=cuviper 
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`
2022-08-12 02:58:51 +00:00
..
src Auto merge of #99464 - nikic:llvm-15, r=cuviper 2022-08-12 02:58:51 +00:00
Cargo.toml Use serde_json for target spec json 2022-06-03 16:46:19 +00:00
README.md Fix outdated crate names in compiler docs 2021-04-08 11:12:14 -05:00

README.md

rustc_target contains some very low-level details that are specific to different compilation targets and so forth.

For more information about how rustc works, see the rustc dev guide.