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-rw-r--r--clang/lib/Frontend/PrintPreprocessedOutput.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Frontend/PrintPreprocessedOutput.cpp b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
index cfaf8a2..5ae02f97 100644
--- a/clang/lib/Frontend/PrintPreprocessedOutput.cpp
+++ b/clang/lib/Frontend/PrintPreprocessedOutput.cpp
@@ -263,6 +263,7 @@ void PrintPPOutputPPCallbacks::FileChanged(SourceLocation Loc,
// predefines buffer.
if (DumpHeaderIncludes && HasProcessedPredefines &&
Reason == PPCallbacks::EnterFile) {
+ // Write to a temporary string to avoid unnecessary flushing on errs().
llvm::SmallString<256> Msg;
llvm::raw_svector_ostream OS(Msg);
for (unsigned i = 0; i != CurrentIncludeDepth; ++i)