Re: Store path in package definition

[Tobias Geerinckx-Rice]

Hi,

On 26 August 2022 20:39:55 UTC, Nathan Dehnel <ncdehnel@gmail.com> wrote:
>Would something like this work?
>
>(string-append (assoc-ref %outputs "out") "/passff.py")

Consider this deprecated.  It's unreliable and even where it appears to work 
can break for what seems to be no reason when, e.g., cross-compiling.

Modulo typos, and indentation being weird because 'phone,

(arguments
 (list
  #:make-flags
  #~(list (string-append "HELLO=" #$output "/bin/hello"))
  #:phases
  #~(modify-phases %standard-phases
     (add-after 'unpack 'option-one
      (lambda _
       (substitute* "foo.c"
        (("hello")
         (string-append #$output "/bin/hello")))))
     (add-after 'unpack 'option-two
      (lambda* (#:key outputs #:allow-other-keys
       (let ((out (assoc-ref outputs "out")))
        (substitute* "foo.c"
         (("hello")
         (string-append out "/bin/hello"))))))))))

From what you describe it sounds like you're using a phase, but I included 
make-flags to show that they work the same way.

I used to prefer option one, but actually prefer option two nowadays, because 
it's less magical.

>https://guix.gnu.org/cookbook/en/html_node/Extended-example.html#Build-system-arguments

This should be updated.





Kind regards,

T G-R

Sent on the go.  Excuse or enjoy my brevity.