Safe flags ryzen 5000

nikolis · Apprentice Joined: 21 Aug 2003 Posts: 200 Location: Athens

Is it ok march native, gcc 10.2 with 5950x ?

fedeliallalinea · Posted: Sat Apr 03, 2021 9:56 am Post subject:

I think full support for znver3 is merged in gcc-11 only, you can see what -march=native enable with gcc -march=native -E -v - </dev/null 2>&1 | sed -n 's/.* -v - //p' command (probably -march=znver2).
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Anon-E-moose · Posted: Sat Apr 03, 2021 10:25 am Post subject:

gcc 10.3 should have zen stuff backported
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Satori80a · n00b Joined: 06 Jun 2017 Posts: 48

Which leads me to wonder how to unmask gcc-11. I cant seem to manage it with 'echo "=sys-devel/gcc-11.0.1" >> package.unmask'.

fedeliallalinea · Posted: Sat Apr 03, 2021 11:18 am Post subject:

It is not a good idea to unmask it, package is not keyworded and so not tested.
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Anon-E-moose · Posted: Sat Apr 03, 2021 11:33 am Post subject:

nikolis · Apprentice Joined: 21 Aug 2003 Posts: 200 Location: Athens

Indeed,

fedeliallalinea · Posted: Sat Apr 03, 2021 2:44 pm Post subject:

I'm not sure, but I think you can leave -march=native since zen3 supports zen2 architecture.
I don't recommend you to unmask gcc-11, you might have problems to compile some packages.
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nikolis · Apprentice Joined: 21 Aug 2003 Posts: 200 Location: Athens

I agree with both of your suggestions, i do not use unstable branching especially gcc.

Satori80a · n00b Joined: 06 Jun 2017 Posts: 48

Yeah, after looking into it further, the performance difference between znver2 & znver3 is negligible anyway so it's not worth unmasking gcc-11.