__decltype is a GNU extension, not a C++11 extension.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@151377 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Parse/ParseDeclCXX.cpp b/lib/Parse/ParseDeclCXX.cpp
index c2bf54d..5468700 100644
--- a/lib/Parse/ParseDeclCXX.cpp
+++ b/lib/Parse/ParseDeclCXX.cpp
@@ -653,6 +653,9 @@
       return EndLoc;
     }
   } else {
+    Diag(Tok, Tok.getIdentifierInfo()->isStr("decltype")
+           ? diag::warn_cxx98_compat_decltype : diag::ext_gnu_decltype);
+
     ConsumeToken();
 
     BalancedDelimiterTracker T(*this, tok::l_paren);