Add path to a guix package into CMakeLists.txt

Add path to a guix package into CMakeLists.txt

[Aristide Doussot]

Hello,

     I am new with Guix and currently Guixifying an astronomical library 
(called Wsclean) which directly includes some code from another library 
(namely aocommon) that is already on guix astronomy.scm. In the 
CMakeLists.txt of the library I am trying to install, I want to change 
the line:

"include_directories(${CMAKE_SOURCE_DIR}/external/aocommon/include/)"

into the already installed guix version of aocommon, in my case it would 
be :

"include_directories(/gnu/store/1wiw8m5yjcr26pcqhzbh7bw5ghvbaw90-aocommon-0.0.0-1.7329a07/include/)"

However I don't think other users installing the package would 
mandatorily have 
"/gnu/store/1wiw8m5yjcr26pcqhzbh7bw5ghvbaw90-aocommon-0.0.0-1.7329a07" 
as their path to their installed guix version of aocommon. My question 
is therefore : is there a way to ask guix to find this path based on the 
name of the dependency and use it in my substitute* command on the 
CMakeLists file ?

Thanks,
Aristide Doussot

Re: Add path to a guix package into CMakeLists.txt

[Andreas Enge]

Hello Aristide,

Am Mon, Sep 30, 2024 at 05:44:26PM +0200 schrieb Aristide Doussot:
> into the already installed guix version of aocommon, in my case it would be
> "include_directories(/gnu/store/1wiw8m5yjcr26pcqhzbh7bw5ghvbaw90-aocommon-0.0.0-1.7329a07/include/)"
> However I don't think other users installing the package would mandatorily
> have "/gnu/store/1wiw8m5yjcr26pcqhzbh7bw5ghvbaw90-aocommon-0.0.0-1.7329a07"
> as their path to their installed guix version of aocommon. My question is
> therefore : is there a way to ask guix to find this path based on the name
> of the dependency and use it in my substitute* command on the CMakeLists
> file ?

this is indeed quite a common action. For instance, I do something like this
in the package vinci in gnu/packages/maths.scm:

       (modify-phases %standard-phases
         (replace 'configure
           ;; register the lrs location in the config file
           (lambda* (#:key inputs #:allow-other-keys)
             (let* ((lrs (assoc-ref inputs "lrslib"))
                    (lrsexec (string-append lrs "/bin/lrs")))
               (substitute* "vinci.h"
                 (("#define LRS_EXEC      \"lrs\"")
                  (string-append "#define LRS_EXEC \"" lrsexec "\""))))
             #t))

So the function defining the phase needs to take the keyword parameter
"inputs", and this is set to the inputs of the package.
Then (assoc-ref inputs "lrslib") resolves to /gnu/store/...-lrslib-...,
the store path corresponding to the input package.

However, this is an "old style" package; for instance, phases do not end
with #t anymore. I do not know whether one would do differently with the
modern gexp style approach.

In any case, I hope you can already continue in this direction.

Andreas

Re: Add path to a guix package into CMakeLists.txt

[James Smith]

Andreas Enge <andreas@enge.fr> writes:

> this is indeed quite a common action. For instance, I do something like this
> in the package vinci in gnu/packages/maths.scm:
>
>        (modify-phases %standard-phases
>          (replace 'configure
>            ;; register the lrs location in the config file
>            (lambda* (#:key inputs #:allow-other-keys)
>              (let* ((lrs (assoc-ref inputs "lrslib"))
>                     (lrsexec (string-append lrs "/bin/lrs")))
>                (substitute* "vinci.h"
>                  (("#define LRS_EXEC      \"lrs\"")
>                   (string-append "#define LRS_EXEC \"" lrsexec "\""))))
>              #t))
>
> So the function defining the phase needs to take the keyword parameter
> "inputs", and this is set to the inputs of the package.
> Then (assoc-ref inputs "lrslib") resolves to /gnu/store/...-lrslib-...,
> the store path corresponding to the input package.
>
> However, this is an "old style" package; for instance, phases do not end
> with #t anymore. I do not know whether one would do differently with the
> modern gexp style approach.

In case you're wondering, the example above when rewritten in the
current style would look something like this:

  #~(modify-phases %standard-phases
      (replace 'configure
        ;; Register the lrs location in the config file.
        (lambda* (#:key inputs #:allow-other-keys)
          (substitute* "vinci.h"
            (("#define LRS_EXEC      \"lrs\"")
             (string-append "#define LRS_EXEC \""
                            (search-input-file inputs "/bin/lrs") "\""))))))

Hope that helps,

James

Re: Add path to a guix package into CMakeLists.txt

[Felix Lechner via]

Hi Aristide,

On Thu, Oct 03 2024, Andreas Enge wrote:

> (let* ((lrs (assoc-ref inputs "lrslib"))

Andreas practically co-founded Guix and I'm a noobie, but I think Lily
might have told me once that 'search-input-file' is now preferred.

Kind regards
Felix