[cfe-dev] Preventing clang from generating SSE2 symbols

[İsmail Dönmez]

Hi;

For 32bit clang builds I need to target i586 as the lowest base, which
means no SSE2 support. While configuring llvm I pass

--host=i586-linux \
--target=i586-linux \

And stage2 build always contain SSE2 instructions:

[/havana]> objdump -d
/havana/build-cache/build-root-openSUSE_12.1-i586/home/abuild/rpmbuild/BUILD/llvm-3.0/stage2/Release/lib/libLLVM*|grep
movsd.*eax.*xmm0
    1568:       f2 0f 10 00             movsd  (%eax),%xmm0
    16f0:       f2 0f 10 00             movsd  (%eax),%xmm0
    480c:       f2 0f 10 40 04          movsd  0x4(%eax),%xmm0
    679d:       f2 0f 10 00             movsd  (%eax),%xmm0
    3f4b:       f2 0f 10 40 04          movsd  0x4(%eax),%xmm0
    5232:       f2 0f 10 40 04          movsd  0x4(%eax),%xmm0
[...]


Any idea how can I prevent clang from generating SSE2 symbols for i586
builds?

Regards,
ismail
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