Re: More C errors by default in GCC 14 (implicit function declarations etc.)

On Tue, Apr 18, 2023 at 9:42=E2=80=AFAM Jan Engelhardt <[email protected]> wr=
ote:
>
>
> On Tuesday 2023-04-18 15:19, Neal Gompa wrote:
> >On Tue, Apr 18, 2023 at 8:36=E2=80=AFAM Florian Weimer <[email protected]=
om> wrote:
> >>
> >> TL;DR: I want to propose a GCC 14 change which will impact
> >> distributions, so I'd like to gather some feedback from OpenSUSE.
> >>
> >> Specifically, I'm investigating the following changes:
> >>
> >> * -Werror=3Dimplicit-function-declaration
> >> * -Werror=3Dimplict-int
> >> * (tentative) -Werror=3Dint-conversion
> >> * (very tentative) -Werror=3Dincompatible-pointer-types
> >> * For -Wdiscarded-qualifies
> >>
> >> I want to propose at least the first two for GCC 14.
>
> Might as well enable all of it at once, then the community only needs
> one pass per defective software.
>

I would also like to reiterate this point. The worst thing you can do
is slow-roll changes like this. Being punched in the face once is
better than being punched in the face several times in succession.
Having to deal with this in Fedora, I would really rather not do it
over and over and over if we can do it all at once.

(Yes, I really feel like dealing with these changes is equivalent to
getting punched in the face. I dealt with them far too much with my
C++ packages in Fedora.)

> >> The numbers so far don't look great, but are manageable.  Fedora has
> >> 23,101 source package last time a looked.  We have fixed 796 of them,
>
> 3.8% is actually really great for syntax-related changes,
> reproducible-builds (in openSUSE) also has a nay ratio of ~3.4%,
> but of course r-b is more difficult to fix I think.
>

Build reproducibility (as defined by Debian, which is what openSUSE
follows) also has disputed usefulness among the broader community,
especially upstreams. That makes it harder for things to be fixed in
the first place.

> >> I would appreciate some discussion on the OpenSUSE impact.  I assume
> >> OpenSUSE does mass rebuilds after GCC rebases, a bit like Fedora?
> >
> >openSUSE does rebuilds of the whole distribution on a fairly regular
> >basis
>
> There is a also staging project (ironically named
> openSUSE:Factory:Staging:Gcc7) where a new gcc (not 7) gets to
> test-build a sizable portion of the distro before promoting it in
> openSUSE:Factory and before causing the super rebuild.

Super rebuilds are fun though. :)



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