1 files changed, 9 insertions, 0 deletions
diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index a58c935620a..c57a736d1b0 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -573,6 +573,15 @@ struct UnknownPragmaHandler : public PragmaHandler {
                     Token &PragmaTok) override {
     // Figure out what line we went to and insert the appropriate number of
     // newline characters.
+    if (ShouldExpandTokens) {
+      // The first token does not have expanded macros. Expand them, if
+      // required.
+      Token Toks[] = {PragmaTok};
+      PP.EnterTokenStream(Toks, llvm::array_lengthof(Toks),
+                          /*DisableMacroExpansion=*/false,
+                          /*OwnsTokens=*/false);
+      PP.Lex(PragmaTok);
+    }
     Callbacks->startNewLineIfNeeded();
     Callbacks->MoveToLine(PragmaTok.getLocation());
     Callbacks->OS.write(Prefix, strlen(Prefix));