On Mon, Jan 17, 2022 at 12:27:15PM -0600, Justin Forbes wrote:
> > 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.
> >
> > 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 suppose I should have checked fedora-devel before trying to chase
> down build failures as kernel merge window issues.  Kernel builds are
> failing in a few places (depending on arch).

For kernel, the only bug on the GCC side I'm aware of is
https://gcc.gnu.org/PR101941

        Jakub
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