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

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Message-ID: <loom.20131107T233210-897@post.gmane.org>
Date: Thu, 7 Nov 2013 22:35:24 +0000 (UTC)
From: David Wuertele <dave+gmane@...rtele.com>
To: musl@...ts.openwall.com
Subject: Re: arm softfp compatibility arch/fpu in gcc-4.8.2

John Spencer <maillist-musl <at> barfooze.de> writes:

> > 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.

Thanks!  That was what I was hoping.

I see that gcc-4.8.2 supports "--with-float=softfp".  I'm confused about what
to use for "--with-fpu", if anything.  My choices are:

		| vfp | vfp3 | vfpv3 \
		| vfpv3-fp16 | vfpv3-d16 | vfpv3-d16-fp16 | vfpv3xd \
		| vfpv3xd-fp16 | neon | neon-fp16 | vfpv4 | vfpv4-d16 \
		| fpv4-sp-d16 | neon-vfpv4 | fp-arm-v8 | neon-fp-armv8 \
                | crypto-neon-fp-armv8)

If I omit the "--with-fpu", will it just default to use soft float all the time?

Dave

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