Auto merge of #126907 - glaubitz:sparc-fixes, r=nagisa

Fixes for 32-bit SPARC on Linux

This PR fixes a number of issues which previously prevented `rustc` from being built
successfully for 32-bit SPARC using the `sparc-unknown-linux-gnu` triplet.

In particular, it adds linking against `libatomic` where necessary, uses portable `AtomicU64`
for `rustc_data_structures` and rewrites the spec for `sparc_unknown_linux_gnu` to use
`TargetOptions` and replaces the previously used `-mv8plus` with the more portable
`-mcpu=v9 -m32`.

To make `rustc` build successfully, support for 32-bit SPARC needs to be added to the `object`
crate as well as the `nix` crate which I will be sending out later as well.

r? nagisa

2 files changed, 6 insertions, 6 deletions

diff --git a/compiler/rustc_data_structures/src/marker.rs b/compiler/rustc_data_structures/src/marker.rs
index a9ccfbed411..32fad0de1aa 100644
--- a/compiler/rustc_data_structures/src/marker.rs
+++ b/compiler/rustc_data_structures/src/marker.rs
@@ -147,14 +147,14 @@ cfg_match! {
             [crate::owned_slice::OwnedSlice]
         );
 
-        // PowerPC and MIPS platforms with 32-bit pointers do not
+        // MIPS, PowerPC and SPARC platforms with 32-bit pointers do not
         // have AtomicU64 type.
-        #[cfg(not(any(target_arch = "powerpc", target_arch = "mips")))]
+        #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc", target_arch = "sparc")))]
         already_sync!(
             [std::sync::atomic::AtomicU64]
         );
 
-        #[cfg(any(target_arch = "powerpc", target_arch = "mips"))]
+        #[cfg(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc"))]
         already_sync!(
             [portable_atomic::AtomicU64]
         );
diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
index ecb85db33f7..5ae79ca988f 100644
--- a/compiler/rustc_data_structures/src/sync.rs
+++ b/compiler/rustc_data_structures/src/sync.rs
@@ -270,12 +270,12 @@ cfg_match! {
 
         pub use std::sync::atomic::{AtomicBool, AtomicUsize, AtomicU32};
 
-        // PowerPC and MIPS platforms with 32-bit pointers do not
+        // MIPS, PowerPC and SPARC platforms with 32-bit pointers do not
         // have AtomicU64 type.
-        #[cfg(not(any(target_arch = "powerpc", target_arch = "mips")))]
+        #[cfg(not(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc")))]
         pub use std::sync::atomic::AtomicU64;
 
-        #[cfg(any(target_arch = "powerpc", target_arch = "mips"))]
+        #[cfg(any(target_arch = "mips", target_arch = "powerpc", target_arch = "sparc"))]
         pub use portable_atomic::AtomicU64;
 
         pub use std::sync::Arc as Lrc;