c11- Check for c11 language option as documentation says

feature is c11 about nested struct declarations must have
struct-declarator-list. Without this change, code
which was meant for c99 breaks. rdar://18125536

llvm-svn: 216469

clang/lib/Sema/SemaDecl.cpp

@@ -3450,7 +3450,7 @@ Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS,
   // C11 6.7.2.1p2:
   //   A struct-declaration that does not declare an anonymous structure or
   //   anonymous union shall contain a struct-declarator-list.
-  if (!getLangOpts().CPlusPlus && CurContext->isRecord() &&
+  if (getLangOpts().C11 && CurContext->isRecord() &&
       DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) {
     // Check for Microsoft C extension: anonymous struct/union member.
     // Handle 2 kinds of anonymous struct/union:

clang/test/CodeGen/ms-anonymous-struct.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fms-extensions -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -std=c11 -fms-extensions -emit-llvm -o - %s | FileCheck %s
 
 // CHECK: %struct.test = type { i32, %struct.nested2, i32 }
 // CHECK: %struct.nested2 = type { i32, %struct.nested1, i32 }

clang/test/Parser/declarators.c

@@ -113,7 +113,6 @@ enum E1 { e1 }: // expected-error {{expected ';'}}
 struct EnumBitfield { // expected-warning {{struct without named members is a GNU extension}}
   enum E2 { e2 } : 4; // ok
   struct S { int n; }: // expected-error {{expected ';'}}
-                       // expected-warning@-1 {{declaration does not declare anything}}
 
 };
 

clang/test/Sema/MicrosoftExtensions.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple i686-windows %s -fsyntax-only -Wno-unused-value -Wmicrosoft -verify -fms-extensions
+// RUN: %clang_cc1 -std=c11 -triple i686-windows %s -fsyntax-only -Wno-unused-value -Wmicrosoft -verify -fms-extensions
 
 
 struct A

clang/test/Sema/anonymous-struct-union.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -std=c11 -verify %s
 struct X {
   union {
     float f3;

clang/test/SemaObjC/ivar-lookup.m

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -verify -Wno-objc-root-class %s
+// RUN: %clang_cc1 -fsyntax-only -std=c11 -verify -Wno-objc-root-class %s
 
 @interface Test {
    int x;