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On Tue, Oct 18, 2022 at 12:47 PM Ulrich Mueller <ulm@g.o> wrote: |
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> |
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> >>>>> On Tue, 18 Oct 2022, David Seifert wrote: |
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> |
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> > What if I want to build Gentoo on an old AMD Thunderbird which has |
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> > neither SSE1 nor the more important SSE2? |
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> |
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> The -mfpmath=sse option is a no-op if the CPU doesn't support SSE, |
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> i.e. it will use 387 arithmetics nevertheless. |
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I don't really see an "effective" way to deploy this via profiles on x86. |
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We could add it to the default CFLAGS setting in |
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profiles/arch/x86/make.defaults. However, we also default to |
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-march=i686 there, and that doesn't support SSE or SSE2. Also, the |
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entire CFLAGS variable is likely to be overridden by the CFLAGS |
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setting in /etc/make.conf. |
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The CFLAGS_x86 profile variable is only used by the |
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multilib_toolchain_setup function in multilib.eclass. In other words, |
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it only affects ebuilds that utilize the multilib eclasses to build |
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libraries for multiple ABIs. That covers all 32-bit libraries on |
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amd64, but doesn't cover all packages on x86. |
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