building newlib for i386-rtemself

[Joel Sherrill]

Schwarz Robert wrote:
> Hello,
> I got trouble building newlib-1.9.0 for i386-rtemself-targets. I'm using the
> standard configure like
> 
> ../newlib-1.9.0/configure --target=$TARGET --prefix=$PREFIX |& tee
> configure.log 
> and it works fine but when making it, it stops at this point:
> 
> f_exp.c:34: error: impossible constraint in `asm'
> gmake[6]: *** [f_exp.o] Error 1
> gmake[6]: 
> 
> I think the trouble is about soft-float. But our Target has a hardware
> floating-point-unit.
> 
> I got the feeling that he's doing it fine for all the other TArgets(seems
> like he's building for athlon,m486,k6 too) only for i386 he's making
> trouble.
> 
> Somebody got an Idea?
> 

When you build gcc/newlib, you build multilib verions of libraries
since the toolset supports multiple CPU models within the family.

newlib 1.9.0 is old so that probably means that the gcc you are using
is of similar vintage.  some gcc versions had a lot of soft fp bugs.
RTEMS including the soft-float multilib option for CPUs like the
i386ex pushed at those corners.  You should be able to
configure with --disable-multilib or edit a file like
gcc/config/i386/t-XXX and eliminate the multilibs you do not want.

Or better.. just update to newer stuff and probably get pre-built
binaries :)

--joel