Handle static functions being redeclared in function scope.

Fixes pr14861.

llvm-svn: 171978

clang/lib/AST/Decl.cpp

@@ -803,6 +803,10 @@ static LinkageInfo computeLVForDecl(const NamedDecl *D, bool OnlyTemplate) {
           !Function->getDeclContext()->isExternCContext())
         return LinkageInfo::uniqueExternal();
 
+      // This is a "void f();" which got merged with a file static.
+      if (Function->getStorageClass() == SC_Static)
+        return LinkageInfo::internal();
+
       LinkageInfo LV;
       if (!OnlyTemplate) {
         if (llvm::Optional<Visibility> Vis = Function->getExplicitVisibility())

clang/test/SemaCXX/linkage2.cpp

@@ -40,3 +40,11 @@ namespace test4 {
     };
   }
 }
+
+namespace test5 {
+  static void g();
+  void f()
+  {
+    void g();
+  }
+}