2 files changed, 6 insertions, 2 deletions
diff --git a/lib/Basic/IdentifierTable.cpp b/lib/Basic/IdentifierTable.cpp
index c002b3f110..78758d7188 100644
--- a/lib/Basic/IdentifierTable.cpp
+++ b/lib/Basic/IdentifierTable.cpp
@@ -207,6 +207,8 @@ tok::PPKeywordKind IdentifierInfo::getPPKeywordID() const {
 
   CASE( 8, 'u', 'a', unassert);
   CASE(12, 'i', 'c', include_next);
+      
+  CASE(16, '_', 'i', __include_macros);
 #undef CASE
 #undef HASH
   }
diff --git a/lib/Lex/PPDirectives.cpp b/lib/Lex/PPDirectives.cpp
index c5dc7abd08..a60d9ba4e1 100644
--- a/lib/Lex/PPDirectives.cpp
+++ b/lib/Lex/PPDirectives.cpp
@@ -528,8 +528,10 @@ TryAgain:
       
     // C99 6.10.2 - Source File Inclusion.
     case tok::pp_include:
-      return HandleIncludeDirective(Result);            // Handle #include.
-
+      return HandleIncludeDirective(Result);       // Handle #include.
+    case tok::pp___include_macros:
+      return HandleIncludeDirective(Result);       // Handle #__include_macros.
+        
     // C99 6.10.3 - Macro Replacement.
     case tok::pp_define:
       return HandleDefineDirective(Result);