GNU bug report logs - #74532
with-extensions does not add native extensions to the load path

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "Timo Wilken" <guix <at> twilken.net>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#74532: closed (with-extensions does not add native extensions
 to the load path)
Date: Tue, 08 Apr 2025 21:00:03 +0000

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Your message dated Tue, 08 Apr 2025 22:59:19 +0200
with message-id <D91K54C00YVA.1OA0N0IEIH0QK <at> twilken.net>
and subject line Close #74532
has caused the debbugs.gnu.org bug report #74532,
regarding with-extensions does not add native extensions to the load path
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
74532: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74532
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From: Tomas Volf <~@wolfsden.cz>
To: bug-guix <at> gnu.org
Subject: with-extensions does not add native extensions to the load path
Date: Mon, 25 Nov 2024 18:49:53 +0100

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The documentation for `with-extensions' says:

> In the same vein, sometimes you want to import not just pure-Scheme
> modules, but also “extensions” such as Guile bindings to C libraries
> or other “full-blown” packages.

However it does not actually add those C libraries into
(guile-extensions-path), which means that trying to actually use a
library imported this way will lead to an error.

I guess `load-path-expression' in (guix gexp) needs to also append to
the `guile-extensions-path' based on the search-paths of the imported
packages?

Reproduction is simple.  Make sure you *do not* have guile-yamlpp
installed in your profile.  Then build the `test' into a store item.

--8<---------------cut here---------------start------------->8---
(use-modules (gnu packages guile-xyz))
(define test
  (with-extensions (list guile-yamlpp)
    (program-file "test" #~(use-modules (yamlpp)))))
--8<---------------cut here---------------end--------------->8---

And try to run it:

--8<---------------cut here---------------start------------->8---
$ /gnu/store/nq0sahcnph5sxms4irq4inv2hq2hfbzr-test
Backtrace:
          19 (primitive-load "/gnu/store/nq0sahcnph5sxms4irq4inv2hq2hfbzr-test")
In ice-9/eval.scm:
   721:20 18 (primitive-eval _)
In ice-9/psyntax.scm:
  1229:36 17 (expand-top-sequence _ _ _ #f _ _ _)
  1221:19 16 (parse _ (("placeholder" placeholder)) ((top) #(ribcage () () ())) _ e (eval) #)
   259:10 15 (parse _ (("placeholder" placeholder)) (()) _ c&e (eval) (hygiene guile-user))
In ice-9/boot-9.scm:
  3935:20 14 (process-use-modules _)
   222:17 13 (map1 (((yamlpp))))
  3936:31 12 (_ ((yamlpp)))
  3327:17 11 (resolve-interface (yamlpp) #:select _ #:hide _ #:prefix _ #:renamer _ # _)
In ice-9/threads.scm:
    390:8 10 (_ _)
In ice-9/boot-9.scm:
  3253:13  9 (_)
In ice-9/threads.scm:
    390:8  8 (_ _)
In ice-9/boot-9.scm:
  3544:20  7 (_)
   2836:4  6 (save-module-excursion _)
  3564:26  5 (_)
In unknown file:
           4 (primitive-load-path "yamlpp" #<procedure 7f405e4fd560 at ice-9/boot-9.scm:35…>)
In yamlpp.scm:
     65:1  3 (_)
In unknown file:
           2 (load-extension "libguile-yamlpp" "init")
In system/foreign-library.scm:
   190:25  1 (load-foreign-library _ #:extensions _ #:search-ltdl-library-path? _ # _ # _ # …)
In unknown file:
           0 (dlopen "libguile-yamlpp.so" 1)

ERROR: In procedure dlopen:
In procedure dlopen: file "libguile-yamlpp.so", message "libguile-yamlpp.so: cannot open shared object file: No such file or directory"
--8<---------------cut here---------------end--------------->8---

Have a nice day,
Tomas

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

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From: "Timo Wilken" <guix <at> twilken.net>
To: <74532-done <at> debbugs.gnu.org>
Subject: Close #74532
Date: Tue, 08 Apr 2025 22:59:19 +0200

Somehow, this issue was magically reopened.

See the stanza beginning with "Did not alter fixed versions and reopened" at
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=74532>.

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