Re: gcc-12.0.0-0.4.fc36 in rawhide

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On Fri, 21 Jan 2022 09:55:01 -0700
Jerry James <loganjerry@xxxxxxxxx> wrote:

> On Fri, Jan 14, 2022 at 7:32 AM Jakub Jelinek <jakub@xxxxxxxxxx> wrote:
> > Another important thing I wanted to say is that we'd like to switch
> > ppc64le from the numerically problematic IBM extended long double to
> > IEEE 754 quad long double.  This is an ABI change.  Some libraries
> > are already built so that they support both ABIs at the same time,
> > including glibc, libstdc++, libgcc, libgfortran etc.
> > For other libraries and binaries, the compiler, assembler and linker
> > will notice if they use long double and flag them as using either
> > IBM or IEEE long double and linker (or I think dynamic linker too)
> > might complain when things are mixed.
> > Right now the rawhide gcc still defaults to -mabi=ibmlongdouble
> > but the glibc/gcc libraries are built compatibly with both.
> > We'd like to configure gcc shortly before the mass rebuild with
> > --with-long-double-format=ieee so that it will default to
> > -mabi=ieeelongdouble, probably on a side-tag build first, and it
> > will be highly desirable to rebuild at least some of the most commonly
> > used library packages in the order of dependencies there, otherwise
> > I'd be afraid the mass rebuild could fail for way too many packages
> > (as the mass rebuild doesn't do dependency order rebuilds but just
> > goes through packages alphabetically or so).
> 
> I don't know if this change is involved, but I've got several packages
> that failed to build on ppc64le only, with what look like gcc
> segfaults:
> - cli11: https://koji.fedoraproject.org/koji/taskinfo?taskID=81476792
> - dra2ter: https://koji.fedoraproject.org/koji/taskinfo?taskID=81482527
> - libfplll: https://koji.fedoraproject.org/koji/taskinfo?taskID=81533813
> - libpoly: https://koji.fedoraproject.org/koji/taskinfo?taskID=81536797
> - mp: https://koji.fedoraproject.org/koji/taskinfo?taskID=81548297
> - python-fpylll: https://koji.fedoraproject.org/koji/taskinfo?taskID=81597035

could be https://bugzilla.redhat.com/show_bug.cgi?id=2043517


		Dan
 
> Also note that libmpc failed to build on ppc64le only:
> https://koji.fedoraproject.org/koji/taskinfo?taskID=81535783
> 
> Since gcc uses libmpc, it's probably important to look at that one carefully.
> -- 
> Jerry James
> http://www.jamezone.org/
> 
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