* Zbigniew Jędrzejewski-Szmek: > I think that this really needs to be benchmarked. Without that the > discussion will just go on in circles. There are two nice options for > this: either copr, where you first build the redhat-rpm-config with the > adjusted options and then rebuild some subset of rawhide to be able > to do benchmarks, or just the same thing locally on a server with a bunch > of CPUs. One architecture should be enough.
If that one architecture is x86_64. Note that x86_64 needs -mno-omit-leaf-frame-pointer, not just -fno-omit-frame-pointer. i686 will have additional build failures and very different performance characteristics. ppc64le already uses a backchain, s390x has a different backchain convention (and may not be affected by -fno-omit-frame-pointer). aarch64 needs -mno-omit-leaf-frame-pointer as well. > Mini-rebuilds like that take a few days, so it's entirely possible to > do. I pushed a change to rawhide glibc which makes it inherit the -fno-omit-frame-pointer and -mno-omit-leaf-frame-pointer from redhat-rpm-config. I think both flags are required if you want to use the frame pointers for accurate unwinding. GCC (for libgcc and libstdc++) will need very different changes. I don't think it inherits the build flags, either. Thanks, Florian _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org 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@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
