Re: arm softfp compatibility arch/fpu in gcc-4.8.2

[John Spencer <maillist-musl@barfooze.de>]

David Wuertele wrote:
> Just starting with musl, http://wiki.musl-libc.org/wiki/Getting_started said
> for my Tegra 3 to use
> 
> --with-arch=armv7-a --with-float=hard --with-fpu=vfpv3-d16
> 
> This works fine except for one thing -- I have some libraries built with a
> soft-float toolchain that I need to link against.  The VFP register seems to be
> the problem:
> 
> arm-linux-musleabihf/4.8.2/../../../../arm-linux-musleabihf/bin/ld: error: sign
> uses VFP register arguments, lib/armeabi/libXXX.a(YYY.o) does not

"does not" is not really a helpful error message.

> arm-linux-musleabihf/4.8.2/../../../../arm-linux-musleabihf/bin/ld: failed to
> merge target specific data of file lib/armeabi/libXXX.a(YYY.o)
> 
> What arch/fpu should I use to build a toolchain that can link against this
> library?

if you need to link to proprietary softfloat modules, you have to use 
"softfp" float mode. that one is compatible to soft, but makes full use 
of the FPU.