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Rollup merge of #114496 - taiki-e:sparc32-atomic, r=Amanieu

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Set max_atomic_width for sparc-unknown-linux-gnu to 32

This is currently set to 64

90f0b24ad3/compiler/rustc_target/src/spec/sparc_unknown_linux_gnu.rs (L8)

However, AFAIK, this architecture doesn't support 64-bit atomics, and LLVM generates libcalls: https://godbolt.org/z/chzThWGG1

(Currently, attempts to run `cargo test` for this target result in "undefined reference to `__sync_val_compare_and_swap_8'" error. 02efe1e74f)

r? `@Amanieu`
This commit is contained in:
Matthias Krüger 2023-08-07 16:47:56 +02:00 committed by GitHub
commit 9b1f9433db
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compiler/rustc_target/src/spec/sparc_unknown_linux_gnu.rs
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@ -5,7 +5,7 @@ pub fn target() -> Target {
let mut base = super::linux_gnu_base::opts();
base.endian = Endian::Big;
base.cpu = "v9".into();
base.max_atomic_width = Some(64);
base.max_atomic_width = Some(32);
base.add_pre_link_args(LinkerFlavor::Gnu(Cc::Yes, Lld::No), &["-mv8plus"]);
Target {