1 files changed, 11 insertions, 0 deletions
diff --git a/lib/Lex/Preprocessor.cpp b/lib/Lex/Preprocessor.cpp
index 33c94b6e8a..bc28442784 100644
--- a/lib/Lex/Preprocessor.cpp
+++ b/lib/Lex/Preprocessor.cpp
@@ -115,6 +115,17 @@ Preprocessor::~Preprocessor() {
   delete Callbacks;
 }
 
+bool Preprocessor::isSystemHeader(const FileEntry* F) const {
+  if (F) {
+    DirectoryLookup::DirType DirInfo = HeaderInfo.getFileDirFlavor(F);
+    if (DirInfo == DirectoryLookup::SystemHeaderDir ||
+        DirInfo == DirectoryLookup::ExternCSystemHeaderDir)
+      return true;
+  }
+  return false;
+}
+
+
 /// Diag - Forwarding function for diagnostics.  This emits a diagnostic at
 /// the specified Token's location, translating the token's start
 /// position in the current buffer into a SourcePosition object for rendering.