Add support for the C11 _Alignof keyword.

This behaves like the existing GNU __alignof and C++11 alignof keywords;
most of the patch is simply adding the third token spelling to various places.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159494 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Sema/SemaLookup.cpp b/lib/Sema/SemaLookup.cpp
index 827cfbcfff..94efb2fff3 100644
--- a/lib/Sema/SemaLookup.cpp
+++ b/lib/Sema/SemaLookup.cpp
@@ -3604,6 +3604,12 @@ static void AddKeywordsToConsumer(Sema &SemaRef,
         Consumer.addKeywordResult("nullptr");
       }
     }
+
+    if (SemaRef.getLangOpts().C11) {
+      // FIXME: We should not suggest _Alignof if the alignof macro
+      // is present.
+      Consumer.addKeywordResult("_Alignof");
+    }
   }
 
   if (CCC.WantRemainingKeywords) {