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

Set max_atomic_width for sparc-unknown-linux-gnu to 32 This is currently set to 64 https://github.com/rust-lang/rust/blob/90f0b24ad3e7fc0dc0e419c9da30d74629cd5736/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. taiki-e/rust-cross-toolchain@02efe1e) r? `@Amanieu`
rust-lang · Aug 7, 2023 · 9b1f943 · 9b1f943
2 parents b0a5126 + 4d4df88
commit 9b1f943
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/compiler/rustc_target/src/spec/sparc_unknown_linux_gnu.rs b/compiler/rustc_target/src/spec/sparc_unknown_linux_gnu.rs
@@ -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 {