Re: package definition question: referring to source files of another package?

[Andy Tai <atai@atai.org>]

Thanks. this is the pattern that seems to work, posted here for reference:
(define-public tensorflow-lite
  (package
    (name "tensorflow-lite")
     ...
    (arguments
     `(#:configure-flags

       (list ...
        (string-append "-Dgemmlowp_SOURCE_DIR=" (assoc-ref
%build-inputs "gemmlowp-src"))
...

    (inputs
     `(
       ("gemmlowp-src"
          ,(package-source gemmlowp))
...

where A is tensorflow-lite and B is gemmlowp

On Sat, Sep 2, 2023 at 9:18 PM Liliana Marie Prikler
<liliana.prikler@gmail.com> wrote:
> Am Samstag, dem 02.09.2023 um 20:35 -0700 schrieb Andy Tai:
> > In some scenarios package A may refer to source files in package B.
> > The question is,
> > 1. How to reference source directory of package B from within
> > definition of package A?
> You can use (package-source B) both within source and inputs.  The only
> caveat here is that A and B should best be located in the same file;
> things break badly if they are split and introduce cyclic references.
> Note that the and part is more likely than you think, since the thunked
> nature of inputs normally makes them harmless.
>
> Cheers