[PATCH] D70588: Don't report "main" as missing a prototype in freestanding mode

[Bill Wendling via Phabricator via cfe-commits]

void created this revision.
void added a reviewer: efriedma.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

A user may want to use freestanding mode with the standard "main" entry
point. It's not useful to warn about a missing prototype as it's not
typical to have a prototype for "main".


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D70588

Files:
  clang/lib/Sema/SemaDecl.cpp
  clang/test/Sema/no-warn-missing-prototype.c


Index: clang/test/Sema/no-warn-missing-prototype.c
===================================================================
--- /dev/null
+++ clang/test/Sema/no-warn-missing-prototype.c
@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -fsyntax-only -Wmissing-prototypes-x c -ffreestanding -verify %s
+// RUN: %clang_cc1 -fsyntax-only -Wmissing-prototypes -x c++ -ffreestanding -verify %s
+// expected-no-diagnostics
+int main() {
+  return 0;
+}
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -13319,8 +13319,10 @@
     return false;
 
   // Don't warn about 'main'.
-  if (FD->isMain())
-    return false;
+  if (isa<TranslationUnitDecl>(FD->getDeclContext()->getRedeclContext()))
+    if (IdentifierInfo *II = FD->getIdentifier())
+      if (II->isStr("main"))
+        return false;
 
   // Don't warn about inline functions.
   if (FD->isInlined())


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