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Re: arm -msoft-float and -lfloat question
On Thu, Nov 18, 2010 at 12:00 PM, Bryan Hundven <bryanhundven@gmail.com> wrote:
> I noticed that arm oabi is still using -lfloat in LIBGCC_SPEC in
> gcc/config/arm/linux-elf.h
>
> Looking around for libfloat, I found:
>
> http://netwinder.osuosl.org/users/s/scottb/public_html/notes/FP-Notes-6.html
> http://netwinder.osuosl.org/users/s/scottb/
>
> Which hasn't had a release since 1999, with a patch in 2000.
>
> libgcc should provide these most of these soft float symbols.
> Then I also notice the gcc/config/soft-fp is available, but only used
> for armv6m.
>
> If we don't get these symbols from gcc, then we get them from
> (e)glibc's soft-fp?
>
> This does not affect eabi, because the gcc/config/arm/linux-eabi.h
> unsets LIBGCC_SPEC.
>
>
> The reason I am bringing this up, is to validate a couple variants of
> the same patch that has been floating around since about gcc 3.3:
>
> http://kegel.com/crosstool/crosstool-0.43/patches/gcc-3.4.4/gcc-3.4.0-arm-nolibfloat.patch
>
> and a newer version of this patch which adds more functions to
> lib1asmfuncs (in libgcc?).
>
> http://git.buildroot.net/buildroot/tree/toolchain/gcc/4.5.1/810-arm-softfloat-libgcc.patch
>
> Any help in understanding why this is still here will be very helpful.
>
> Thanks in advance,
>
> -Bryan
>
Should I have asked this question on a different list?
-Bryan