Follow-up Comment #28, bug#64806 (group make): Thanks, this is important information.
So I think the next step is to understand which call to osync_clear closes the handle. Maybe we shouldn't make that call, at least on Windows? Also, this only happens sometimes, right? That is, -Otarget sometimes does work, right? So it isn't that inheriting mutex handles doesn't work in general, it's more like sometimes the handle is "taken" after the child process called osync_clear (which frees the handle for opening any other file object), and then the handle is no longer usable as a mutex, and a grandchild process inherits that unusable handle. So perhaps only the top-level make, the one which calls CreateMutex, should call CloseHandle on the mutex? Can you try that? _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?64806> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/