Forgive me if this is the wrong spot to ask.
I'm doing some CPU intensive work, and I'd like to optimize a few
packages. Even if it's only a 5% gain, it will add up over many
hours/days of continuous runtime.
Back in the day, I could recompile a package like this:
rpmbuild --rebuild --target=pentium3 package.srpm
And it would produce a package with source compiled using -march=pentium3.
That doesn't appear to be the case anymore for a couple of reasons:
1) /usr/lib/rpm/platform has only the generic x86_64, causing rpm macros
for more specific microarchitectures, like znver2, to fail.
2) Some configure/make scripts incorrectly recognize "znver2" as a
request for a cross-compiler, and exit the build with an error.
3) Some rpm spec files appear to use the x86_64 architecture as a test
for 64-bit capable, so providing a more specific microarchitecture, like
znver2, actually disables 64-bit extensions in those packages.
Is there a way to pass '-march=znver2' to the compiler from rpmbuild?
Or are these all bugs that have crept in over the years?
Thanks for your help.
Joseph D. Wagner
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