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Re: Recent libstdc++ regression on i686-linux: abi/cxx_runtime_only_linkage.cc
On Wed, Aug 27, 2008 at 10:15 AM, Joseph S. Myers
<joseph@codesourcery.com> wrote:
> On Fri, 22 Aug 2008, Richard Henderson wrote:
>
>> H.J. Lu wrote:
>> > Can we declare that Linux/ia32 generates i486 insn by default?
>>
>> We the gcc team? I'm not sure. For now I'll say no.
>>
>> We an individual linux distributor? Certainly.
>> In fact I would be surprised if i586 wasn't a
>> decent minimum these days.
>
> glibc has certainly required -march=i486 or greater for some time to build
> for IA32; it will fail to link for -march=i386 because of missing atomic
Given that glibc requires -march=i486, I think Linux/ia32 should default
to i486.
> operations. (And I hold that i686-* should mean -march=i686 default not
> -mcpu=i386 and similarly x86_64-* -m32 should default to -march=x86_64,
> subject to --with-arch etc. in both cases.)
>
I think i[4-6]86-*-linux and x86_64-*-linux should default to i486 at minimum
for 32bit.
--
H.J.