[Support] Ensure redirected outputs don't contain output from previous tests.

stdout may be buffered, and may not flush on every write. Explicitly flushing
before redirecting the output ensures that the captured output does not contain
output from other tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@360617 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/unittests/Support/CommandLineTest.cpp b/unittests/Support/CommandLineTest.cpp
index 2bf07e374940e3b8584bff001fdade539add4c90..4fb20b18d9bf23b7dccb91a7e5cf38dbdfa689a7 100644 (file)
--- a/unittests/Support/CommandLineTest.cpp
+++ b/unittests/Support/CommandLineTest.cpp
@@ -1085,6 +1085,7 @@ public:
   // Return std::string because the output of a failing EXPECT check is
   // unreadable for StringRef. It also avoids any lifetime issues.
   template <typename... Ts> std::string runTest(Ts... OptionAttributes) {
+    outs().flush();  // flush any output from previous tests
     AutoDeleteFile File;
     {
       OutputRedirector Stdout(fileno(stdout));