[libcxx-commits] [clang] [libcxx] [clang] [modules] Implement P3618R0: Allow attaching main to the global module (PR #146461)

[Ashwin Banwari via libcxx-commits]

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@@ -12400,12 +12400,9 @@ bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD,
 
 void Sema::CheckMain(FunctionDecl *FD, const DeclSpec &DS) {
   // [basic.start.main]p3
-  //    The main function shall not be declared with a linkage-specification.
-  if (FD->isExternCContext() ||
-      (FD->isExternCXXContext() &&
-       FD->getDeclContext()->getRedeclContext()->isTranslationUnit()))
-    Diag(FD->getLocation(), diag::ext_main_invalid_linkage_specification)
-        << FD->getLanguageLinkage();
+  //    The main function shall not be declared with C linkage-specification.
+  if (FD->isExternCContext())
+    Diag(FD->getLocation(), diag::ext_main_invalid_linkage_specification);
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ashwinbanwari wrote:

According to proposal, `extern "C"` for main is still ill-formed regardless if it is named module or not. On other hand, `extern "C++"` is allowed whether in named module or not.

https://github.com/llvm/llvm-project/pull/146461