> Downstream, we had a separate set of builds flags for certain packages > and used -O3 there, targeted at POWER (both ppc64 and ppc64le), for > increased use of vectorization presumably. > > I don't think this was ever upstreamed to Fedora (the downstream changes > were in the redhat-rpm-config package). I don't recall seeing a > corresponding Fedora change. As a result, the recent downstream rebase > lost support for this.
Not sure what you mean by upstreamed the downstream change, this was in Fedora but around Fedora 26 the ppc64p7 sub architectured was EOLed. Over all it was a yum hack and it wasn't supported in dnf and we worked with IBM to move most of their optimisations to IFUNC or run time detectable fast paths in the areas they felt needed specific optimisations. > Should Fedora package maintainers remove _performance_build support or > custom flag overrides for -O3 from their packages? The supported sub-set of packages for this particular project were: binutils bzip2 cyrus-sasl glibc httpd kernel libxml2 mariadb openssl pam pcre php postfix postgresql python python3 sendmail xz zlib And yes, any perf build bits in those pacakages, and probably some dependencies, is unused and can be removed. > My understanding is that Fedora build flag policy is set by the > redhat-rpm-config package, which currently specifies -O2 for all > architectures. > > 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://getfedora.org/code-of-conduct.html > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
