[bug#54876] [PATCH] gnu: sbcl-py4cl: Fix path to python3.

[Guillaume Le Vaillant <glv@posteo.net>]

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Maxime Devos <maximedevos@telenet.be> skribis:

> Paul A. Patience schreef op di 12-04-2022 om 02:55 [+0000]:
> +               (substitute* "src/callpython.lisp"
> +                 (("\\*python-command\\* \"python\"")
> +                  (string-append "*python-command* "
> +                                 "\"" (which "python3") "\"")))))
>
> This is most likely incorrect when cross-compiling.  Do
>
>   (lambda* (#:key inputs #:allow-other-keys)
>      [...]
>      (string-append [...] (search-input-file inputs "bin/python3") [...]) [...])
>
> instead, such that it looks in 'inputs' instead of 'native-inputs'.

The two are equivalent because so far asdf-build-system doesn't support
cross builds using "--target=TRIPLET". But using 'search-input-file'
looks better.

> Also, now that 'python3' is patched in, is the following still relevant:
>
>       (propagated-inputs
>        ;; This package doesn't do anything without python available
>        (list python
>
> (I mean, does it still need to be propagated?)

Indeed, having python3 in 'inputs' should be enough now.

Pushed in 59377f88ed1e31d38b34279f393949bf17e505ad.
Thanks.

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