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| author | Nikita Popov <npopov@redhat.com> | 2022-07-21 16:20:00 +0200 |
|---|---|---|
| committer | Nikita Popov <npopov@redhat.com> | 2022-07-22 10:54:39 +0200 |
| commit | 75146102197c7f35e6c38cb402b2bc1065858c54 (patch) | |
| tree | 99e38b8dab86f531be5a835c894f6d328771e9e5 | |
| parent | 96c2df810b0b681fee63cae11ca63844792b6190 (diff) | |
| download | rust-75146102197c7f35e6c38cb402b2bc1065858c54.tar.gz rust-75146102197c7f35e6c38cb402b2bc1065858c54.zip | |
Mark atomics as unsupported on thumbv6m
The thumbv6m target does not support atomics. Historically, LLVM had a bug where atomic load/stores for this target were emitted as plain load/stores rather than as libatomic calls. This was fixed in https://reviews.llvm.org/D120026, which will be part of LLVM 15. As we require that "atomic support" does not use libatomic, we need to indicate that this target does not have native atomics.
| -rw-r--r-- | compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs b/compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs index 2546ab9b7e6..dffa19ae55c 100644 --- a/compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs +++ b/compiler/rustc_target/src/spec/thumbv6m_none_eabi.rs @@ -14,8 +14,9 @@ pub fn target() -> Target { // The ARMv6-M architecture doesn't support unaligned loads/stores so we disable them // with +strict-align. features: "+strict-align".into(), - // There are no atomic CAS instructions available in the instruction set of the ARMv6-M + // There are no atomic instructions available in the instruction set of the ARMv6-M // architecture + max_atomic_width: Some(0), atomic_cas: false, ..super::thumb_base::opts() }, |