1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index de166c75e2cb..358c96a78300 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -1746,6 +1746,7 @@ void Preprocessor::ExpandBuiltinMacro(Token &Tok) {
           return llvm::StringSwitch<bool>(II->getName())
                       .Case("__make_integer_seq", LangOpts.CPlusPlus)
                       .Case("__type_pack_element", LangOpts.CPlusPlus)
+                      .Case("__builtin_available", true)
                       .Default(false);
         }
       });