Re: [gentoo-user] march cflag for Intel Pentium Dual-Core E2160 SLA8Z Malay processor

[gevisz <gevisz@gmail.com>]

ср, 3 окт. 2018 г. в 12:50, Walter Dnes <waltdnes@waltdnes.org>:
>
>   What's happening is that the ebuild is going through a lookup table of
> CPU flags, and saying... "if you invoke a certain advanced feature, then
> you also have to invoke the base version of that feature".  If you ask
> for the advanced feature, but not the base feature, it's like trying to
> build the top 4 storeys of a 10-storey building without the bottom 6
> storeys.  From your output...
>
>   If you're calling for avx2, then you also need avx
> > cpu_flags_x86_avx2? ( cpu_flags_x86_avx )
>
>   If you're calling for sse4_2, then you also need sse4_1
> > cpu_flags_x86_sse4_2? ( cpu_flags_x86_sse4_1 )
>
>   If you're calling for sse4_1, then you also need ssse3
> > cpu_flags_x86_sse4_1? ( cpu_flags_x86_ssse3 )
>
>   If you're calling for ssse3, then you also need sse3 (count the "s")
> > cpu_flags_x86_ssse3? ( cpu_flags_x86_sse3 )
>
>   If you're calling for sse3, then you also need sse2
> > cpu_flags_x86_sse3? ( cpu_flags_x86_sse2 )
>
>   If you're calling for sse2, then you also need sse
> > cpu_flags_x86_sse2? ( cpu_flags_x86_sse )
>
>   If you're calling for sse, then you also need mmxext
> > cpu_flags_x86_sse? ( cpu_flags_x86_mmxext )
>
>   If you're calling for mmxext, then you also need mmx
> > cpu_flags_x86_mmxext? ( cpu_flags_x86_mmx )
>
> AMD If you're calling for 3dnowext, then you also need 3dnow
> > cpu_flags_x86_3dnowext? ( cpu_flags_x86_3dnow )
>
> AMD If you're calling for 3dnow, then you also need mmx
> > cpu_flags_x86_3dnow? ( cpu_flags_x86_mmx )
>
>   Basically, if flag B is an extension of flag A and builds on it, then
> calling flag B requires calling flag A.  Think of it as a "march flag
> dependency tree".

Ok, thank you for explanation.

Interestingly, I have build almost entire system without
mmxext flag and only firefox, ffmpeg and vlc started
to complane about it.