Re: _performance_build and -O3 package builds
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
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