[bug#47182] [PATCH 00/18] Add support for powerpc64le-linux (wip-ppc64le-for-master)

[Efraim Flashner <efraim@flashner.co.il>]

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On Wed, Mar 17, 2021 at 11:10:23PM -0700, Chris Marusich wrote:
> Efraim Flashner <efraim@flashner.co.il> writes:
> 
> > On Mon, Mar 15, 2021 at 11:45:00PM -0700, Chris Marusich wrote:
> >> * gnu/packages/commencement.scm (binutils-final)[arguments]: When checking if
> >> the system is a Power architecture, instead of hard-coding "powerpc-linux",
> >> use the target-powerpc? procedure so it works on more Power architectures.
> >> [inputs]: Likewise.
> >> ---
> >>  gnu/packages/commencement.scm | 4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/gnu/packages/commencement.scm b/gnu/packages/commencement.scm
> >> index c0732bbf62d..d4511ed9148 100644
> >> --- a/gnu/packages/commencement.scm
> >> +++ b/gnu/packages/commencement.scm
> >> @@ -3516,14 +3516,14 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
> >>         #:implicit-inputs? #f
> >>         #:allowed-references
> >>         ,@(match (%current-system)
> >> -         ("powerpc-linux"
> >> +         ((? target-powerpc?)
> >
> > I wonder if this would be better as ,@(if target-powerpc?
> > I didn't test to see how it would work with cross compiling, I don't
> > know if binutils-final gets built in that case.
> 
> Are the final inputs ever cross-compiled?  I'm having trouble thinking
> of a case when binutils-final would ever be cross-compiled.  The package
> (like all the final inputs) exist specifically to provide the native GCC
> used for building the rest of the things in the system.  In a case where
> you want to cross-compile e.g. GNU Hello, Guix first uses these final
> inputs to (natively) build a cross compilation toolchain, and then it
> will use that one to cross-compile GNU Hello.
> 
> I don't think we need to account for cross-compliation of the final
> inputs, but please correct me if I'm wrong.
> 

I first tried to cross compile binutils-final from x86_64 but it failed
because all the mes packages don't support powerpc yet. Then I tried
emulating an aarch64 machine to cross compile binutils-final and that
failed at make-boot0. I think we can assume that binutils-final (and the
other -final packages) aren't going to be cross compiled.

,@(if might be cleaner to look at, but ,@(match makes it easier to
make change later without worrying about nested if statements. Which
hopefully shouldn't be an issue anyway for binutils-final.

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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