Re: soft-float support

["Graeme Peterson" <gp at qnx dot com>]

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.
>