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-rw-r--r--lib/Serialization/ASTWriter.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index a5977f5cfe..deb6c87efb 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -1451,7 +1451,8 @@ void ASTWriter::WriteUserDiagnosticMappings(const Diagnostic &Diag) {
}
}
- Stream.EmitRecord(DIAG_USER_MAPPINGS, Record);
+ if (!Record.empty())
+ Stream.EmitRecord(DIAG_USER_MAPPINGS, Record);
}
//===----------------------------------------------------------------------===//