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-rw-r--r--lib/Support/Timer.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/Support/Timer.cpp b/lib/Support/Timer.cpp
index 481f6ba508..784b77cf59 100644
--- a/lib/Support/Timer.cpp
+++ b/lib/Support/Timer.cpp
@@ -61,6 +61,10 @@ raw_ostream *llvm::CreateInfoOutputFile() {
if (OutputFilename == "-")
return new raw_fd_ostream(1, false); // stdout.
+ // Append mode is used because the info output file is opened and closed
+ // each time -stats or -time-passes wants to print output to it. To
+ // compensate for this, the test-suite Makefiles have code to delete the
+ // info output file before running commands which write to it.
std::string Error;
raw_ostream *Result = new raw_fd_ostream(OutputFilename.c_str(),
Error, raw_fd_ostream::F_Append);