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Stop suppressing -Wuninitialized in userland for WARNS >= 2 and <= 4.
This is from 2001 (via FreeBSD, who still have it). Since a lot of important stuff is in that WARNS range (libc, most prominently) and since the option has found some good bugs for us (just see the MFCs of recent days), we definitely want it to be enabled. None of the issues it reported turned out to be a false positive. Do, however, turn off -Wmaybe-uninitialized in that WARNS range for now. Also, while here, turn on -Winit-self too.
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