the linaro toolchain and older arm versions
john.rigby at linaro.org
Tue Oct 5 22:23:01 UTC 2010
Thanks Michael. Just wanted to make sure I understood. The "do no
harm" goal and the Thumb2 libgcc seem to be somewhat contradictory
however. I realize that choices need to be made and only odd ducks
like me will likely run into issues. My particular case is wanting to
build u-boot for old and new ARM chips with the same gcc. U-Boot has
its own libgcc that I can use as a work around.
On Tue, Oct 5, 2010 at 3:57 PM, Michael Hope <michael.hope at linaro.org> wrote:
> On Wed, Oct 6, 2010 at 10:44 AM, John Rigby <john.rigby at linaro.org> wrote:
>> I believe that the libgcc.a in our toolchain contains Thumb-2 code. I
>> verified this by doing objdump on libgcc.a and I see combinations of
>> 16 and 32 bit instructions. So does that mean that the toolchain is
>> only usable for ARM versions that support Thumb-2?
> Our focus is Thumb-2 on Cortex-A processors. We try to 'do no harm',
> so Linaro GCC should be as good as the FSF GCC on older ARM
> architectures or non-ARM architectures such as i686 and x86_64.
> The included libgcc is compiled for processors with Thumb-2 and
> VFPv3-D16. I'm afraid I have no plans for other variants at the
> moment, but you might want to talk with Marcin and Wookey about this.
> -- Michael
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