On 04-04-2022 21:37, Christopher Baines wrote:
>> Maybe you could add a gcc compiling for 32-bit ppc (maybe without a
>> glibc since this is grub) and patch the configuration script to use the
>> 32-bit ppc gcc instead of using the 64-bit ppc+-m32?
> I've had a go at this, using something like what I've included below,
> but I haven't stumbled upon the right options yet, or a way to work out
> why gcc still thinks "-m32 not supported". [...]

I was thinking of skipping the multilib and maybe skipping support for 
multiple endians, something like:

> (use-modules (guix utils) (guix packages) (guix gexp))
> (define (ppc-32bit-gcc)
>   (if (%current-target-system)
>       (error "not supported -- TODO make a cross-compiler to 32-bit 
> ppc here with cross-gcc")
>       (package
>         (inherit (@ (gnu packages gcc) gcc))
>         (arguments
>           (substitute-keyword-arguments
>             (package-arguments (@ (gnu packages gcc) gcc))
>             ((#:system _) "ppc-linux")
>             ((#:configure-flags flags)
>              (pk 'f #~(append (list "--with-endian=big") #$flags))))))))
> (ppc-32bit-gcc)
(currently compiling, let's see if if it works ...)

Greetings,
Maxime.