[MSVC2012] Allow 'mutable' references

Some standard header files from MSVC2012 use 'mutable' on references, though it is directly prohibited by the standard.
Fix for http://llvm.org/PR22444
Differential Revision: http://reviews.llvm.org/D7370

llvm-svn: 228113

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1241,6 +1241,9 @@ def err_storageclass_invalid_for_member : Error<
   "storage class specified for a member declaration">;
 def err_mutable_function : Error<"'mutable' cannot be applied to functions">;
 def err_mutable_reference : Error<"'mutable' cannot be applied to references">;
+def ext_mutable_reference : ExtWarn<
+  "'mutable' on a reference type is a Microsoft extension">,
+  InGroup<Microsoft>;
 def err_mutable_const : Error<"'mutable' and 'const' cannot be mixed">;
 def err_mutable_nonmember : Error<
   "'mutable' can only be applied to member variables">;

clang/lib/Sema/SemaDecl.cpp

@@ -12348,7 +12348,8 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
   if (!InvalidDecl && Mutable) {
     unsigned DiagID = 0;
     if (T->isReferenceType())
-      DiagID = diag::err_mutable_reference;
+      DiagID = getLangOpts().MSVCCompat ? diag::ext_mutable_reference
+                                        : diag::err_mutable_reference;
     else if (T.isConstQualified())
       DiagID = diag::err_mutable_const;
 
@@ -12357,8 +12358,10 @@ FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T,
       if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid())
         ErrLoc = D->getDeclSpec().getStorageClassSpecLoc();
       Diag(ErrLoc, DiagID);
-      Mutable = false;
-      InvalidDecl = true;
+      if (DiagID != diag::ext_mutable_reference) {
+        Mutable = false;
+        InvalidDecl = true;
+      }
     }
   }
 

clang/test/SemaCXX/ms_mutable_reference_member.cpp

@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 %s -fsyntax-only -verify -fms-compatibility
+
+struct S {
+  mutable int &a; // expected-warning {{'mutable' on a reference type is a Microsoft extension}}
+  S(int &b) : a(b) {}
+};
+
+int main() {
+  int a = 0;
+  const S s(a);
+  s.a = 10;
+  return s.a + a;
+}