[clang] [TargetVersion] Only enable on RISC-V and AArch64 (PR #115991)

[Piyou Chen via cfe-commits]

================
@@ -3040,6 +3040,11 @@ bool Sema::checkTargetVersionAttr(SourceLocation 
LiteralLoc, Decl *D,
   enum FirstParam { Unsupported };
   enum SecondParam { None };
   enum ThirdParam { Target, TargetClones, TargetVersion };
+
+  if (!Context.getTargetInfo().getTriple().isRISCV() &&
+      !Context.getTargetInfo().getTriple().isAArch64())
+    return Diag(LiteralLoc, diag::err_target_version_unsupported);
----------------
BeMg wrote:

Great idea. This patch now uses the TargetSpecificAttr to enable target_version 
for AArch64 and RISC-V.

https://github.com/llvm/llvm-project/pull/115991
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