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-rw-r--r--Tools/scripts/run_tests.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Tools/scripts/run_tests.py b/Tools/scripts/run_tests.py
index b582e13250..30283023b6 100644
--- a/Tools/scripts/run_tests.py
+++ b/Tools/scripts/run_tests.py
@@ -26,6 +26,7 @@ def is_resource_use_flag(arg):
def main(regrtest_args):
args = [sys.executable,
+ '-u', # Unbuffered stdout and stderr
'-W', 'default', # Warnings set to 'default'
'-bb', # Warnings about bytes/bytearray
'-E', # Ignore environment variables