Re: Arm and big endian

[Pierre Habraken <Pierre dot Habraken at imag dot fr>]

Ian Lance Taylor wrote:
> 
> > So my question is : What configure option I have to set up for
> > gcc in order to get newlib being cross-compiled to big endian code ?
> >
> > Has someone succeeded in doing that (with or without multilib
> > support) ?
> 
> I don't think there is any way to do that without patching the source.
> 
> It's easy to patch the source to make -mbig-endian the default: change
> the definition of TARGET_DEFAULT to include ARM_FLAG_BIG_END.
> TARGET_DEFAULT is defined in config/arm/*.h; the exact definition
> depends upon your target.
> 
> It is only slightly more work to add support for --with-endian to
> config.gcc.

My goal is not to get -mbig-endian being the default. I just want that
whenever I link a big endian object file the proper big endian version
of newlib be coosen by gcc instead of the little endian default one.

I tried the trick suggested some time ago by Michael Butts in
http://sources.redhat.com/ml/newlib/2001/msg00561.html, i.e. changing
the setting of the MULTILIB_OPTIONS and MULTILIB_DIRNAMES variables in
gcc/Makefile, right after the configure stage.
The resulting build behaves as I expected.
The command arm-elf-gcc -print-multi-lib prints then:
.;
thumb;@mthumb
be;@mbig-endian
thumb/be;@mthumb@mbig-endian

Pierre
-- 
Pierre HABRAKEN - mailto:Pierre.Habraken@imag.fr
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