Re: 32-bit Python interpreter on a 64-bit system (ARM)

[Tomas Volf]

On 2023-12-12 15:09:52 +0000, Wicki Gabriel (wicg) wrote:
> Hi
>
> Thanks for the input, Csepp, this seems to be exactly what I was looking for!
>
> Now I include the altered package like so:
> `
>
> (package
>   (name foo)
>   ...
>   (propagated-inputs
>    (list
>     (with-parameters ((%current-system "armhf-linux"))
>       some-package)))
>   ...
>   )
>
> `
>
> But this produces the following error message when building package "foo".  
> What am I missing?  I am able to ,lower and ,build the (with-parameters) 
> package in a repl so i guess the expression itself is fine?

I cannot say what you are doing wrong, but my interest got piqued so I gave it a
try as well.  It works for me:

$ guix build --no-offload -f /tmp/test.scm
[..]
/gnu/store/867m8dkv9hzsl4c1nqrj1nzg502a4l3c-hello-2.10

$ file 
/gnu/store/867m8dkv9hzsl4c1nqrj1nzg502a4l3c-hello-2.10/bin/python-native/bin/python3.10
/gnu/store/867m8dkv9hzsl4c1nqrj1nzg502a4l3c-hello-2.10/bin/python-native/bin/python3.10:
 ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, 
interpreter 
/gnu/store/ln6hxqjvz6m9gdd9s97pivlqck7hzs99-glibc-2.35/lib/ld-linux-x86-64.so.2,
 for GNU/Linux 2.6.32, stripped
$ file 
/gnu/store/867m8dkv9hzsl4c1nqrj1nzg502a4l3c-hello-2.10/bin/python-i686/bin/python3.10
/gnu/store/867m8dkv9hzsl4c1nqrj1nzg502a4l3c-hello-2.10/bin/python-i686/bin/python3.10:
 ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked, 
interpreter 
/gnu/store/0hr9jpczkcgpgqkhf4q4868xd57h5a62-glibc-2.35/lib/ld-linux.so.2, for 
GNU/Linux 2.6.32, stripped

So for me it seems to work.  My package definition (adjusted hello package from
the cookbook), maybe you can use it as a starting point:

(use-modules (gnu)
             (gnu packages)
             (gnu packages python)
             (guix build-system gnu)
             (guix download)
             (guix gexp)
             (guix licenses)
             (guix packages))

(package
  (name "hello")
  (version "2.10")
  (source (origin
            (method url-fetch)
            (uri (string-append "mirror://gnu/hello/hello-" version
                                ".tar.gz"))
            (sha256
             (base32
              "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i"))))
  (inputs `(("python-native" ,python)
            ("python-i686"   ,(with-parameters ((%current-system "i686-linux"))
                                python))))
  (build-system gnu-build-system)
  (arguments
   (list
    #:phases
    #~(modify-phases %standard-phases
        (add-after 'install 'link-pythons
          (lambda* (#:key inputs #:allow-other-keys)
            (symlink (assoc-ref inputs "python-native")
                     (string-append #$output "/bin/python-native"))
            (symlink (assoc-ref inputs "python-i686")
                     (string-append #$output "/bin/python-i686")))))))
  (synopsis "Hello, GNU world: An example GNU package")
  (description
   "GNU Hello prints the message \"Hello, world!\" and then exits.  It
serves as an example of standard GNU coding practices.  As such, it supports
command-line arguments, multiple languages, and so on.")
  (home-page "https://www.gnu.org/software/hello/";)
  (license gpl3+))


Hope this helps,
Tomas

--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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