Messages in this thread | | | From | Linus Torvalds <> | Date | Thu, 28 Jul 2016 14:22:02 -0700 | Subject | Re: [PATCH] Kbuild: Move -Wmaybe-uninitialized to W=1 |
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On Thu, Jul 28, 2016 at 12:03 PM, Linus Torvalds <torvalds@linux-foundation.org> wrote: > > And the new warnings were actually not so much due to new code in 4.7, > as the fact that in between I did a user-space upgrade, and gcc 6.1.1 > has regressed to the point of the warnings being an unusable mess.
Actually, thinking more about this, I'm not convinced it's a gcc regression, because older gcc's have defainitely had the same problem with that warning causing tons of spurious issues.
So it might actually mostly be due commit 877417e6ffb9 ("Kbuild: change CC_OPTIMIZE_FOR_SIZE definition"). As a result of that, we now end up not using CC_OPTIMIZE_FOR_SIZE for allmodconfig builds.
And since for us, -Os always disabled that warning anyway (because gcc has always made a bad job of it), the bogus warnings didn't use to be so annoying and hide the real things.
Of course, a big part of the reasoning for that commit was apparently because Arnd liked the warning. It back-fired. Now that warning is gone for everybody, because it's so broken.
Linus
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