[clang] [Driver] Enable outline atomics for OpenBSD/aarch64 (PR #155713)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-driver

@llvm/pr-subscribers-clang

Author: Brad Smith (brad0)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/155713.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/OpenBSD.h (+5) 
- (modified) clang/test/Driver/openbsd.c (+5) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/OpenBSD.h b/clang/lib/Driver/ToolChains/OpenBSD.h
index 11b873cb30032..ad0f9e6799568 100644
--- a/clang/lib/Driver/ToolChains/OpenBSD.h
+++ b/clang/lib/Driver/ToolChains/OpenBSD.h
@@ -79,6 +79,11 @@ class LLVM_LIBRARY_VISIBILITY OpenBSD : public Generic_ELF {
   void AddCXXStdlibLibArgs(const llvm::opt::ArgList &Args,
                            llvm::opt::ArgStringList &CmdArgs) const override;
 
+  bool IsAArch64OutlineAtomicsDefault(
+      const llvm::opt::ArgList &Args) const override {
+    return true;
+  }
+
   std::string getCompilerRT(const llvm::opt::ArgList &Args, StringRef Component,
                             FileType Type = ToolChain::FT_Static,
                             bool IsFortran = false) const override;
diff --git a/clang/test/Driver/openbsd.c b/clang/test/Driver/openbsd.c
index 1f12cfca9488b..5fa827a584ceb 100644
--- a/clang/test/Driver/openbsd.c
+++ b/clang/test/Driver/openbsd.c
@@ -140,6 +140,11 @@
 // RUN:   | FileCheck -check-prefix=CHECK-LTO-FLAGS %s
 // CHECK-LTO-FLAGS: "-plugin-opt=mcpu=x86-64"
 
+// Check 64-bit ARM for outline atomics
+// RUN: %clang --target=aarch64-unknown-openbsd -### -c %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=CHECK-AARCH64-ATOMIC %s
+// CHECK-AARCH64-ATOMIC: "-target-feature" "+outline-atomics"
+
 // Check 64-bit ARM for BTI and PAC flags
 // RUN: %clang --target=aarch64-unknown-openbsd -### -c %s 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHECK-AARCH64-BTI-PAC %s

``````````

</details>


https://github.com/llvm/llvm-project/pull/155713