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/ > _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
