[clang] [clang][FMV] Allow declaration of function versions in namespaces. (PR #93044)

[Alexandros Lamprineas via cfe-commits]

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@@ -11868,8 +11868,10 @@ static bool CheckMultiVersionFunction(Sema &S, FunctionDecl *NewFD,
     return false;
 
   if (!OldDecl || !OldDecl->getAsFunction() ||
-      OldDecl->getDeclContext()->getRedeclContext() !=
-          NewFD->getDeclContext()->getRedeclContext()) {
+      (OldDecl->getDeclContext()->getRedeclContext() !=
+           NewFD->getDeclContext()->getRedeclContext() &&
+       OldDecl->getDeclContext()->getEnclosingNamespaceContext() !=
+           NewFD->getDeclContext()->getEnclosingNamespaceContext())) {
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labrinea wrote:

Thanks for the suggestion! I'll push a revised version.

https://github.com/llvm/llvm-project/pull/93044