[bug#68058] [PATCH] gnu: cross-gcc-toolchain: Add native-search-paths.

[Jean-Pierre De Jesus Diaz <jean@foundation.xyz>]

Hi Thiago,

>In issue 69394 you wrote that this solution doesn't work when there are
>multiple cross toolchains installed on the same profile (the CROSS_
>environment variables would have all the cross toolchains), but I think
>that moving from allowing zero cross toolchain installed in the
>profile¹ to one cross toolchain installed is already an improvement. :-)

And

>¹ Except for bare-metal cross toolchains, which IIUC don't have this
>  problem because they don't use crt*.o files?

It's only a problem with the platforms that provide a C standard library so
bare-metal ones are unaffected.  However some of the bare-metal targets
provide a C standard library like `avr' or `arm-none-eabi' which I'm still
working on, they both provide AVR Libc and Newlib respectively and suffer
from the same problem.

That said there's no downside on the patch other than the bad user
experience IMO, but the bad UX is already there anyway but I think also
this should be merged so that we can start making progress towards
having more functional cross toolchain packages.

On Tue, Apr 9, 2024 at 10:44 PM Thiago Jung Bauermann
<thiago.bauermann@linaro.org> wrote:
>
>
> Hello,
>
> [ What I'm saying here is a duplicate of what I just sent in issue
>   #69394, but I think it's useful to have these comments together with
>   the patch, to facilitate discussion about it.  ]
>
> Jean-Pierre De Jesus DIAZ via Guix-patches via <guix-patches@gnu.org> writes:
>
> > * gnu/packages/cross-base.scm (cross-gcc-toolchain): Add
> >   native-search-paths.
> >
> > Change-Id: Ib4cc510fde71b8d3140e1001c3931f74300da8a0
> > ---
> >  gnu/packages/cross-base.scm | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
> > index 6ee7b315d8..dc6f7922d6 100644
> > --- a/gnu/packages/cross-base.scm
> > +++ b/gnu/packages/cross-base.scm
> > @@ -760,6 +760,7 @@ (define* (cross-gcc-toolchain/implementation target
> >                   (((names . directory) ...)
> >                    (union-build #$output directory))))))
> >      (inputs `(,xbinutils ,xgcc ,@(if libc (list libc) '())))
> > +    (native-search-paths (package-search-paths xgcc))
> >      (home-page (package-home-page xgcc))
> >      (synopsis
> >       (format #f "Complete GCC tool chain for C/C++ development (~a)" target))
> >
> > base-commit: 756ba0429e84ee0f8ce30484439b78c00c61d286
>
> Today I ran into the problem described in issue 69394 with a custom
> aarch64-linux-gnu cross toolchain:
>
> $ aarch64-linux-gnu-gcc -o ~/tmp/hello -g ~/tmp/hello.c
> aarch64-linux-gnu-ld: cannot find crt1.o: No such file or directory
> aarch64-linux-gnu-ld: cannot find crti.o: No such file or directory
> collect2: error: ld returned 1 exit status
>
> And I was able to fix it by locally applying the patch above. Thank you!
>
> IMHO this patch should be applied.
>
> In issue 69394 you wrote that this solution doesn't work when there are
> multiple cross toolchains installed on the same profile (the CROSS_
> environment variables would have all the cross toolchains), but I think
> that moving from allowing zero cross toolchain installed in the
> profile¹ to one cross toolchain installed is already an improvement. :-)
>
> --
> Thiago
>
> ¹ Except for bare-metal cross toolchains, which IIUC don't have this
>   problem because they don't use crt*.o files?