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Use stdbuf to try to disable stdout buffering on darwin #22241

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5 changes: 5 additions & 0 deletions scripts/tests/chiptest/runner.py
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
import queue
import re
import subprocess
import sys
import threading
import typing

Expand Down Expand Up @@ -130,6 +131,10 @@ def RunSubprocess(self, cmd, name, wait=True, dependencies=[], timeout_seconds:
logging.INFO, capture_delegate=self.capture_delegate,
name=name + ' ERR')

if sys.platform == 'darwin':
# Try harder to avoid any stdout buffering in our tests
cmd = ['stdbuf', '-o0'] + cmd

if self.capture_delegate:
self.capture_delegate.Log(name, 'EXECUTING %r' % cmd)

Expand Down