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-rw-r--r--lib/Lex/PPMacroExpansion.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index ecd4d4cfc6..e8658255e4 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -649,6 +649,7 @@ static bool HasFeature(const Preprocessor &PP, const IdentifierInfo *II) {
.Case("is_trivially_copyable", LangOpts.CPlusPlus)
.Case("is_union", LangOpts.CPlusPlus)
.Case("tls", PP.getTargetInfo().isTLSSupported())
+ .Case("underlying_type", LangOpts.CPlusPlus)
.Default(false);
}