[uClibc]-msoft-float questions

[Shane Nay]

On Monday 06 May 2002 15:08, Kyle Harris wrote:
> Hi,
>
> I'm trying to build an application with arm-uclibc-gcc. I'm using
> the -msoft-float compiler option. During the link phase I get lots
> of errors similar to:
>
> undefined reference to `__muldf3`
>
> I noticed uclibc is built without -msoft-float, but attempting to
> build this way also fails. Can someone tell what I need to do to
> support a processor without an FPU?

Do you have the float library for ARM?  (libfloat)  If so do your 
linker scripts for -msoft-float include it, and are you adding 
-msoft-float while attempting to link uClibc.  (You need to specify 
that option during both the compile phase and the link phase so the 
linker scripts do "the right thing")

Generally, most people use hardfloat on ARM, and let the exceptions 
go up to the kernel, and the kernel does the arithmetic.  Based on 
the size of the libfloat library, this method is advantagous if size 
is an issue.  If floating point performance is "the prime directive" 
then using softfloat is better.

Thanks,
Shane Nay.