Re: gcc-12.0.0-0.4.fc36 in rawhide

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On Sat, Jan 15, 2022 at 09:30:25PM -0800, Michel Alexandre Salim wrote:
> Hi Jakub,
> 
> On Fri, Jan 14, 2022 at 03:31:43PM +0100, Jakub Jelinek wrote:
> > Hi!
> > 
> > gcc 12 snapshot has landed as the system compiler into rawhide today.
> > GCC 12 is going to enter its stage4 development phase (only regression
> > and documentation bugfixes allowed) on Monday 17th, so there should be
> > just those bugfixes and not new features etc. anymore.
> > https://gcc.gnu.org/gcc-12/changes.html lists important changes,
> > most important is probably that vectorization is enabled at -O2 now
> > which is the option with most of the distribution is built with.
> > 
> > https://gcc.gnu.org/gcc-12/porting_to.html is so far incomplete and lists
> > some cases where people need to adjust their code.  Other things
> > include the usual C++ header changes, where previously some standard
> > header included some other header as an implementation detail but it doesn't
> > any longer and so code that relied on such indirect include that isn't
> > required by the standard needs to include the header that provides whatever
> > it relies on.  Or e.g. packages using -Werror where new warnings are
> > reported with the newer compiler and -Werror results in build failures.
> 
> Can this be documented soon?
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99032
> 
> It hit nextcloud-client:
> https://bugzilla.redhat.com/show_bug.cgi?id=2041135 which compiles fine
> with GCC 11 for F34 and F35.
> 
> > 
> > If there are bugs on the compiler side, please let me know immediately,
> > so that those bugs can be fixed before the mass rebuild next week.
> > 
> I'm going to exercise this with the new Folly stack on Monday once the
> weekly tags are created. Will try and report ASAP.
>
Rebuilding folly, and building the latest tagged release, both fail with
GCC 12:

https://bugzilla.redhat.com/show_bug.cgi?id=2042690

It happens that libfmt has also been upgraded, so it's hard to pinpoint.
I'm going to see if I can tag a scratch build of the newer fmt on a F35
sidetag so we can rule that out.

Regards,

-- 
Michel Alexandre Salim
identities: https://keyoxide.org/5dce2e7e9c3b1cffd335c1d78b229d2f7ccc04f2

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