bug#50261: [PATCH] gnu: node: Enable cross-compilation.

[Pierre Langlois]

Hi Mathieu,

Mathieu Othacehe <othacehe@gnu.org> writes:

> Hello Pierre,
>
>> While working on tree-sitter I realized our node packages didn't
>> cross-compile [0] so I thought I'd give it a go, here's a patch!
>
> Nice!
>
>> I'm not sure there's any way to express this restriction in the package
>> definition, it would be good to fail in a useful way, any thoughts? I
>> suspect a mechanism for this isn't really worth the effort, I don't know
>> of any other packages like this.
>
> Yeah that's a strange limitation, I don't think we have something
> similar elsewhere. A restriction that compares the host and target
> bitness is maybe not worth it.
>
>> -                      (string-append (assoc-ref inputs "python")
>> +                      (string-append (assoc-ref (or native-inputs inputs) 
>> "python")
>
> You have several lines such as this one that are longer than the 78
> columns limit.

I did my best to fix those by reworking the configure flags as such:

--8<---------------cut here---------------start------------->8---
             (let* ((prefix (assoc-ref outputs "out"))
                    (xflags ,(if (%current-target-system)
                                 `'("--cross-compiling"
                                    ,(string-append
                                      "--dest-cpu="
                                      (match (%current-target-system)
                                        ((? (cut string-prefix? "arm" <>))
                                         "arm")
                                        ((? (cut string-prefix? "aarch64" <>))
                                         "arm64")
                                        ((? (cut string-prefix? "i686" <>))
                                         "ia32")
                                        ((? (cut string-prefix? "x86_64" <>))
                                         "x64")
                                        ((? (cut string-prefix? "powerpc64" <>))
                                         "ppc64")
                                        (_ "unsupported"))))
                                 ''()))
                    (flags (cons (string-append "--prefix=" prefix)
                                 (append xflags configure-flags))))
--8<---------------cut here---------------end--------------->8---

It's still one column over, but I figured it was OK, I couldn't find
another way to write it without sacrificing readability, hope that's OK
:-).

> Other than that, it looks cool, and you can go ahead.

Thanks for the review! Pushed with
9f7c4f380fdd86d81c805b72e4d05e9e658d3dc2 and
5ee38c467298091e98fa12be45facdcc63a59a87.

Pierre

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