[cfe-dev] Preventing clang from generating SSE2 symbols

[İsmail Dönmez]

Hi;

On Wed, Mar 21, 2012 at 7:55 PM, Eli Friedman <eli.friedman at gmail.com>wrote:

> On Wed, Mar 21, 2012 at 4:35 AM, İsmail Dönmez <ismail at namtrac.org> wrote:
> > 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?
>
> Put "-march=i586" into your CFLAGS?


I believe -target should take care of this for now I changed the default
from pentium4 to i586 for 32bit.

Regards,
ismail
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