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Subject: Re: soft-float support
To: gp@qnx.com (Graeme Peterson)
Date: Tue, 08 Oct 2002 16:26:00 -0000
From: "Graeme Peterson" <gp@qnx.com>
Cc: aph@redhat.com (Andrew Haley), gcc@gcc.gnu.org
In-Reply-To: <no.id> from "Graeme Peterson" at Oct 08, 2002 04:06:46 PM
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This got it working.  I also had to add:

  # Do not build libgcc1.
  LIBGCC1 =
  CROSS_LIBGCC1 =

Thanks, all.
GP

> 
> I dug a little and found this, which I copied from t-rs6000:
> 
>    LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c tramp.S
>   
>    dp-bit.c: $(srcdir)/config/fp-bit.c
>          cat $(srcdir)/config/fp-bit.c > dp-bit.c
>   
>    fp-bit.c: $(srcdir)/config/fp-bit.c
>          echo '#define FLOAT' > fp-bit.c
>          cat $(srcdir)/config/fp-bit.c >> fp-bit.c
> 
> I'm building it now, but the comment at the top of fp-bit.c
> seems promising: 
> 
> "/* This is a software floating point library which can be used instead of
>    the floating point routines in libgcc1.c for targets without hardware
>    floating point. */ "
> 
> Think that might be it?  :-)
> 
> GP
> 
> > 
> > Graeme Peterson writes:
> >  > Hi, all.
> >  > 
> >  > I have done some searching, and it seems that gcc (in this case 
> >  > 2.95.3 targetting ppc-QNX6) does not have support for statically
> >  > linked software emulated floating point instructions.
> >  > 
> >  > Can someone clarify for me what is required to get this going?  Do 
> >  > I need to implement the floating point emulation and tell gcc to 
> >  > use it in place of the fadd in the __adddf3 call?  If so, how do I
> >  > do that?
> > 
> > You need to specify the multilibs in your target file for qnx.
> > 
> > For example, in the current gcc source, gcc/config/rs6000/t-rs6000
> > contains
> > 
> > MULTILIB_OPTIONS = msoft-float
> > MULTILIB_DIRNAMES = soft-float
> > 
> > Andrew.
> > 
> 
>