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

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Package: guix; Reported by: Tomas Volf <~@wolfsden.cz>; dated Mon, 25 Nov 2024 17:51:01 UTC; Maintainer for guix is bug-guix@HIDDEN.
Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Timo Wilken <guix@HIDDEN>
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <20250325182142.8645-5-guix@HIDDEN> (Timo Wilken's message
 of "Tue, 25 Mar 2025 19:12:53 +0100")
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Timo Wilken <guix@HIDDEN> skribis:

> * gnu/packages/guile-xyz.scm (guile-yamlpp) [arguments] <phases>:
>   Add 'set-extension-file-name and move 'check after 'install.
>
> Change-Id: I49a7199b4e0fe4053822374bae59c6e1d0b7ead0

Applied, thanks!
Notification sent to Tomas Volf <~@wolfsden.cz>:
bug acknowledged by developer. Full text available.
Reply sent to Ludovic Courtès <ludo@HIDDEN>:
You have taken responsibility. Full text available.

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 =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>
Subject: [PATCH v2] gnu: guile-yamlpp: Allow usage with `with-extensions'
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* gnu/packages/guile-xyz.scm (guile-yamlpp) [arguments] <phases>:
  Add 'set-extension-file-name and move 'check after 'install.

Change-Id: I49a7199b4e0fe4053822374bae59c6e1d0b7ead0
---
 gnu/packages/guile-xyz.scm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
index f0277f430ec..cabc3101320 100644
--- a/gnu/packages/guile-xyz.scm
+++ b/gnu/packages/guile-xyz.scm
@@ -2020,6 +2020,23 @@ (define-public guile-yamlpp
        (sha256
         (base32 "0ik69y0vddg0myp0zdbkmklma0qkkrqzwlqwkij1zirklz6hl1ss"))))
     (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       ,#~(modify-phases %standard-phases
+            ;; In order to let Guile find the compiled library when used with
+            ;; Guix' `with-extension', hardcode the final path to the library.
+            ;; See <https://issues.guix.gnu.org/74532>.
+            (add-after 'unpack 'set-extension-file-name
+              (lambda* (#:key outputs #:allow-other-keys)
+                (substitute* "scm/yamlpp.scm"
+                  (("\\(load-extension \"libguile-yamlpp\"(.*)\\)" _ init)
+                   (format #f "(load-extension \"~a/lib/guile/3.0/libguile-yamlpp\"~a)"
+                           (assoc-ref outputs "out") init)))))
+            ;; Move 'check after installation, so that the foreign library is
+            ;; present where we expect it (as we hardcode its path above).
+            (delete 'check)
+            (add-after 'install 'check
+              (assoc-ref %standard-phases 'check)))))
     (native-inputs (list autoconf automake libtool pkg-config))
     (inputs (list guile-3.0 yaml-cpp))
     (native-search-paths
-- 
2.49.0
Information forwarded to ~@wolfsden.cz, ludo@HIDDEN, zhengjunjie@HIDDEN, guix@HIDDEN, bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: Timo Wilken <guix@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>,
 =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74532: [PATCH] gnu: guile-yamlpp: Allow usage with
 `with-extensions'
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Hi Tomas, hi Ludo', hi Z572,

On Tue 25 Mar 2025 at 11:10 am CET, Ludovic Courtès wrote:
> Tomas Volf <~@wolfsden.cz> skribis:
>> Timo Wilken <guix@HIDDEN> writes:
>> I am not sure it is optimal to hide *all* errors from load-extension.
>> Maybe check if file exists and then try to load-extension it without the
>> false-if-exception?

I think the v2 patch makes this moot -- see below.

> Or just unconditionally load from the absolute file name?  I don’t see
> what the ‘or’ buys us.

That only works if I move 'check after 'install -- else it fails with an error
in `load-foreign-library', saying the file doesn't exist.

The v2 patch does that, and works for me (as in, it compiles and I can use the
resulting package in `with-extensions').

Feedback is very welcome!

Cheers,
Timo
Information forwarded to ~@wolfsden.cz, ludo@HIDDEN, zhengjunjie@HIDDEN, guix@HIDDEN, bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#74532: [PATCH] gnu: guile-yamlpp: Allow usage with
 `with-extensions'
In-Reply-To: <875xk9vyhq.fsf@HIDDEN> (Tomas Volf's message of "Sun, 16
 Mar 2025 15:30:57 +0100")
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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

> Timo Wilken <guix@HIDDEN> writes:

[...]

>> +                   (format #f "(or (false-if-exception (load-extension =
\"~a/lib/guile/3.0/libguile-yamlpp\"~a)) ~a)"
>> +                           (assoc-ref outputs "out") init all))))))))
>
> I am not sure it is optimal to hide *all* errors from load-extension.
> Maybe check if file exists and then try to load-extension it without the
> false-if-exception?

Or just unconditionally load from the absolute file name?  I don=E2=80=99t =
see
what the =E2=80=98or=E2=80=99 buys us.

Thanks,
Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: Tomas Volf <~@wolfsden.cz>
To: "Timo Wilken" <guix@HIDDEN>
Subject: Re: with-extensions does not add native extensions to the load path
In-Reply-To: <D8H58BCN9SEV.T8XB1KHBJZSR@HIDDEN> (Timo Wilken's message of
 "Sat, 15 Mar 2025 22:04:53 +0100")
References: <D8H58BCN9SEV.T8XB1KHBJZSR@HIDDEN>
Date: Sun, 16 Mar 2025 15:31:38 +0100
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"Timo Wilken" <guix@HIDDEN> writes:

> It still feels wrong to do this on a per-package basis (shouldn't
> `with-extension' take care of setting up the path?), but hey ho.

I definitely agree here...

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: Tomas Volf <~@wolfsden.cz>
To: Timo Wilken <guix@HIDDEN>
Subject: Re: bug#74532: [PATCH] gnu: guile-yamlpp: Allow usage with
 `with-extensions'
In-Reply-To: <20250315211008.8563-3-guix@HIDDEN> (Timo Wilken's message
 of "Sat, 15 Mar 2025 22:10:09 +0100")
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

Hi!

Timo Wilken <guix@HIDDEN> writes:

> * gnu/packages/guile-xyz.scm (guile-yamlpp) [arguments] <phases>:
>   Add 'set-extension-file-name.
>
> Change-Id: I49a7199b4e0fe4053822374bae59c6e1d0b7ead0
> ---
>  gnu/packages/guile-xyz.scm | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
> index 30c8e847996..f43e06a3a7f 100644
> --- a/gnu/packages/guile-xyz.scm
> +++ b/gnu/packages/guile-xyz.scm
> @@ -1997,6 +1997,19 @@ (define-public guile-yamlpp
>         (sha256
>          (base32 "0ik69y0vddg0myp0zdbkmklma0qkkrqzwlqwkij1zirklz6hl1ss"))=
))
>      (build-system gnu-build-system)
> +    (arguments
> +     `(#:phases
> +       ,#~(modify-phases %standard-phases
> +            ;; In order to let Guile find the compiled library when used=
 with
> +            ;; Guix' `with-extension', hardcode the final path to the li=
brary.
> +            ;; The fallback is needed for tests (i.e. before the 'instal=
l phase).
> +            ;; See <https://issues.guix.gnu.org/74532>.
> +            (add-after 'unpack 'set-extension-file-name
> +              (lambda* (#:key outputs #:allow-other-keys)
> +                (substitute* "scm/yamlpp.scm"
> +                  (("\\(load-extension \"libguile-yamlpp\"(.*)\\)" all i=
nit)
> +                   (format #f "(or (false-if-exception (load-extension \=
"~a/lib/guile/3.0/libguile-yamlpp\"~a)) ~a)"
> +                           (assoc-ref outputs "out") init all))))))))

I am not sure it is optimal to hide *all* errors from load-extension.
Maybe check if file exists and then try to load-extension it without the
false-if-exception?

(Sure there is a TOCTTOU problem, but I think that can be ignored in
this case.)

>      (native-inputs (list autoconf automake libtool pkg-config))
>      (inputs (list guile-3.0 yaml-cpp))
>      (native-search-paths

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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--=-=-=--
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

Message received at 74532 <at> debbugs.gnu.org:


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From: Timo Wilken <guix@HIDDEN>
To: 74532 <at> debbugs.gnu.org
Subject: [PATCH] gnu: guile-yamlpp: Allow usage with `with-extensions'
Date: Sat, 15 Mar 2025 22:10:09 +0100
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* gnu/packages/guile-xyz.scm (guile-yamlpp) [arguments] <phases>:
  Add 'set-extension-file-name.

Change-Id: I49a7199b4e0fe4053822374bae59c6e1d0b7ead0
---
 gnu/packages/guile-xyz.scm | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gnu/packages/guile-xyz.scm b/gnu/packages/guile-xyz.scm
index 30c8e847996..f43e06a3a7f 100644
--- a/gnu/packages/guile-xyz.scm
+++ b/gnu/packages/guile-xyz.scm
@@ -1997,6 +1997,19 @@ (define-public guile-yamlpp
        (sha256
         (base32 "0ik69y0vddg0myp0zdbkmklma0qkkrqzwlqwkij1zirklz6hl1ss"))))
     (build-system gnu-build-system)
+    (arguments
+     `(#:phases
+       ,#~(modify-phases %standard-phases
+            ;; In order to let Guile find the compiled library when used with
+            ;; Guix' `with-extension', hardcode the final path to the library.
+            ;; The fallback is needed for tests (i.e. before the 'install phase).
+            ;; See <https://issues.guix.gnu.org/74532>.
+            (add-after 'unpack 'set-extension-file-name
+              (lambda* (#:key outputs #:allow-other-keys)
+                (substitute* "scm/yamlpp.scm"
+                  (("\\(load-extension \"libguile-yamlpp\"(.*)\\)" all init)
+                   (format #f "(or (false-if-exception (load-extension \"~a/lib/guile/3.0/libguile-yamlpp\"~a)) ~a)"
+                           (assoc-ref outputs "out") init all))))))))
     (native-inputs (list autoconf automake libtool pkg-config))
     (inputs (list guile-3.0 yaml-cpp))
     (native-search-paths
-- 
2.48.1
Information forwarded to ~@wolfsden.cz, ludo@HIDDEN, zhengjunjie@HIDDEN, bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

Message received at 74532 <at> debbugs.gnu.org:


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Subject: Re: with-extensions does not add native extensions to the load path
From: "Timo Wilken" <guix@HIDDEN>
To: <74532 <at> debbugs.gnu.org>
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 =?utf-8?q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
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Hi,

Since I ran into this problem with guile-yamlpp today, I went ahead and
implemented Z572's suggestion.

It still feels wrong to do this on a per-package basis (shouldn't
`with-extension' take care of setting up the path?), but hey ho.

I needed the fallback (as suggested by Z572), else tests would fail (as
predicted by Tomas).

Like this, the whole chain works for me; in my case:

(computed-file "test"
  (with-extensions (list guile-yamlpp)
    #~(use-modules (yamlpp))))

Patch incoming.

Cheers,
Timo
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <87o71flehy.fsf@HIDDEN> (Tomas Volf's message of "Fri, 13
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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

> Z572 <zhengjunjie@HIDDEN> writes:
>
>>> How it that usually done?  I cannot do that *before* build, because then
>>> tests would not run (the library is not yet installed into the absolute
>>> path), and I cannot do it after, because I would need to rebuild the .go
>>> files after patching the source code.
>>
>> you can use substitute* to adjust source.
>> e.g.
>>
>> (or (false-if-exception (load-extension "/path/to/lib-some-object-file.s=
o"))
>>     (load-extension "lib-some-object-file.so"))
>>
>
> Thank you for the suggestion.  I am not sure I like the
> false-if-exception part, but temporary adjustment of the (@ (system
> foreign-library) guile-extensions-path) should do the trick as well.

I think you can just do:

  (load-extension "/path/to/lib-some-object-file.so")

but you need to (1) do that in a post-install phase, and (2) re-run
=E2=80=98make=E2=80=99 before =E2=80=98make install=E2=80=99 if necessary.

See =E2=80=98guile-gdbm-ffi=E2=80=99 as one example.

Ludo=E2=80=99.
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

Message received at 74532 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: Z572 <zhengjunjie@HIDDEN>
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <87y10x4g2w.fsf@HIDDEN> (zhengjunjie@HIDDEN's message
 of "Tue, 03 Dec 2024 11:10:15 +0800")
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable


Hello,

Z572 <zhengjunjie@HIDDEN> writes:

>> How it that usually done?  I cannot do that *before* build, because then
>> tests would not run (the library is not yet installed into the absolute
>> path), and I cannot do it after, because I would need to rebuild the .go
>> files after patching the source code.
>
> you can use substitute* to adjust source.
> e.g.
>
> (or (false-if-exception (load-extension "/path/to/lib-some-object-file.so=
"))
>     (load-extension "lib-some-object-file.so"))
>

Thank you for the suggestion.  I am not sure I like the
false-if-exception part, but temporary adjustment of the (@ (system
foreign-library) guile-extensions-path) should do the trick as well.

One thing I am curious about, I can see you have put the load from
absolute path as the first alternative.  But if it fails, it still falls
back to lookup based on the guile-extensions-path.  I wonder whether
putting it at the end of the list would not be better, that way you
could still replace the library in the spirit of LD_PRELOAD by setting
the appropriate environment variable.  And if reproducibility is the
priority, then even the `or' might not make sense.

Any thoughts on that?

Thanks,
Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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From: Z572 <zhengjunjie@HIDDEN>
To: Tomas Volf <~@wolfsden.cz>
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <87plm93b7p.fsf@HIDDEN> (Tomas Volf's message of "Tue, 03
 Dec 2024 00:40:42 +0100")
References: <871pyzdwzi.fsf@HIDDEN> <877c8n94kl.fsf@HIDDEN>
 <87plm93b7p.fsf@HIDDEN>
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Tomas Volf <~@wolfsden.cz> writes:

> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>
>> Hi,
>>
>> Tomas Volf <~@wolfsden.cz> skribis:
>>
>>> The documentation for `with-extensions' says:
>>>
>>>> In the same vein, sometimes you want to import not just pure-Scheme
>>>> modules, but also =E2=80=9Cextensions=E2=80=9D such as Guile bindings =
to C libraries
>>>> or other =E2=80=9Cfull-blown=E2=80=9D packages.
>>
>> It=E2=80=99s not just bindings but also pure Scheme libraries like Guile=
-JSON.
>
> True, and for those it works well.  However the text documentation
> explicitly mentions "bindings to C libraries" as one of the use
> cases. :)
>
>>
>>> 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.
>>
>> [...]
>>
>>>    190:25  1 (load-foreign-library _ #:extensions _ #:search-ltdl-libra=
ry-path? _ # _ # _ # =E2=80=A6)
>>> In unknown file:
>>>            0 (dlopen "libguile-yamlpp.so" 1)
>>>
>>> ERROR: In procedure dlopen:
>>> In procedure dlopen: file "libguile-yamlpp.so", message "libguile-yamlp=
p.so: cannot open shared object file: No such file or directory"
>>
>> Usually, packages like these (guile-gnutls, guile-git, guile-ssh, etc.)
>> have their .so absolute file name hard-coded, which sidesteps this
>> problem entirely.  I recommend doing that for guile-yamlpp as well.
>
> How it that usually done?  I cannot do that *before* build, because then
> tests would not run (the library is not yet installed into the absolute
> path), and I cannot do it after, because I would need to rebuild the .go
> files after patching the source code.

you can use substitute* to adjust source.
e.g.

(or (false-if-exception (load-extension "/path/to/lib-some-object-file.so"))
    (load-extension "lib-some-object-file.so"))

>
> Assuming I have a guile library that creates a new .so library during
> the build, and the .so library must be loadable by the other modules in
> the library during the build (and for the tests), how should I approach
> that?
>
> I am pretty sure I cannot just patch the source code, since the library
> would not be installed into the absolute path yet during the build.
>
> Honestly, setting GUILE_EXTENSIONS_PATH via pre-inst-env seemed like
> fairly elegant solution.
>
>>
>> That said, it would probably make sense to arrange for =E2=80=98with-ext=
ensions=E2=80=99
>> to set GUILE_EXTENSIONS_PATH.
>
> That would be great.  My current work-around is
>
>   (with-extensions (list guile-wolfsden)
>     (program-file
>      "audio-cycle-sinks"
>      #~(begin
>          ;; Bug 74532: Native extensions are not added to the load path.
>          (eval-when (expand load eval)
>            (let ((ext-path (@ (system foreign-library) guile-extensions-p=
ath)))
>              ;; Just a temporary hack, we can live with duplicates in the=
 path.
>              (ext-path (cons #$(file-append guile-wolfsden
>                                             "/lib/guile/3.0/extensions")
>                              (ext-path)))))
>          ...)))
>
> which is anything but elegant.
>
>>
>> Ludo=E2=80=99.
>>
>> PS: Your MUA sets =E2=80=9CMail-Followup-To: bug-guix@HIDDEN=E2=80=9D, =
which is kinda
>>     annoying because that=E2=80=99s the wrong address when replying to a=
 bug.
>>     :-)
>
> Thanks for letting me know, I was not aware of that.  After reading
> (message)Mailing Lists bit more carefully, adjusting the Posting Styles
> and sending a bug fix to the Emacs' bug tracker, I believe it should not
> happen anymore.  Sorry for the annoyance.

--=-=-=
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Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

Message received at 74532 <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <877c8n94kl.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Thu, 28 Nov 2024 08:54:02 +0100")
References: <871pyzdwzi.fsf@HIDDEN> <877c8n94kl.fsf@HIDDEN>
Date: Tue, 03 Dec 2024 00:40:42 +0100
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Hi,
>
> Tomas Volf <~@wolfsden.cz> skribis:
>
>> The documentation for `with-extensions' says:
>>
>>> In the same vein, sometimes you want to import not just pure-Scheme
>>> modules, but also =E2=80=9Cextensions=E2=80=9D such as Guile bindings t=
o C libraries
>>> or other =E2=80=9Cfull-blown=E2=80=9D packages.
>
> It=E2=80=99s not just bindings but also pure Scheme libraries like Guile-=
JSON.

True, and for those it works well.  However the text documentation
explicitly mentions "bindings to C libraries" as one of the use
cases. :)

>
>> 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.
>
> [...]
>
>>    190:25  1 (load-foreign-library _ #:extensions _ #:search-ltdl-librar=
y-path? _ # _ # _ # =E2=80=A6)
>> 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"
>
> Usually, packages like these (guile-gnutls, guile-git, guile-ssh, etc.)
> have their .so absolute file name hard-coded, which sidesteps this
> problem entirely.  I recommend doing that for guile-yamlpp as well.

How it that usually done?  I cannot do that *before* build, because then
tests would not run (the library is not yet installed into the absolute
path), and I cannot do it after, because I would need to rebuild the .go
files after patching the source code.

Assuming I have a guile library that creates a new .so library during
the build, and the .so library must be loadable by the other modules in
the library during the build (and for the tests), how should I approach
that?

I am pretty sure I cannot just patch the source code, since the library
would not be installed into the absolute path yet during the build.

Honestly, setting GUILE_EXTENSIONS_PATH via pre-inst-env seemed like
fairly elegant solution.

>
> That said, it would probably make sense to arrange for =E2=80=98with-exte=
nsions=E2=80=99
> to set GUILE_EXTENSIONS_PATH.

That would be great.  My current work-around is

  (with-extensions (list guile-wolfsden)
    (program-file
     "audio-cycle-sinks"
     #~(begin
         ;; Bug 74532: Native extensions are not added to the load path.
         (eval-when (expand load eval)
           (let ((ext-path (@ (system foreign-library) guile-extensions-pat=
h)))
             ;; Just a temporary hack, we can live with duplicates in the p=
ath.
             (ext-path (cons #$(file-append guile-wolfsden
                                            "/lib/guile/3.0/extensions")
                             (ext-path)))))
         ...)))

which is anything but elegant.

>
> Ludo=E2=80=99.
>
> PS: Your MUA sets =E2=80=9CMail-Followup-To: bug-guix@HIDDEN=E2=80=9D, w=
hich is kinda
>     annoying because that=E2=80=99s the wrong address when replying to a =
bug.
>     :-)

Thanks for letting me know, I was not aware of that.  After reading
(message)Mailing Lists bit more carefully, adjusting the Posting Styles
and sending a bug fix to the Emacs' bug tracker, I believe it should not
happen anymore.  Sorry for the annoyance.

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: 74532 <at> debbugs.gnu.org
Subject: Re: bug#74532: with-extensions does not add native extensions to
 the load path
In-Reply-To: <871pyzdwzi.fsf@HIDDEN> (Tomas Volf's message of "Mon, 25
 Nov 2024 18:49:53 +0100")
References: <871pyzdwzi.fsf@HIDDEN>
Date: Thu, 28 Nov 2024 08:54:02 +0100
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Hi,

Tomas Volf <~@wolfsden.cz> skribis:

> The documentation for `with-extensions' says:
>
>> In the same vein, sometimes you want to import not just pure-Scheme
>> modules, but also =E2=80=9Cextensions=E2=80=9D such as Guile bindings to=
 C libraries
>> or other =E2=80=9Cfull-blown=E2=80=9D packages.

It=E2=80=99s not just bindings but also pure Scheme libraries like Guile-JS=
ON.

> 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.

[...]

>    190:25  1 (load-foreign-library _ #:extensions _ #:search-ltdl-library=
-path? _ # _ # _ # =E2=80=A6)
> 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"

Usually, packages like these (guile-gnutls, guile-git, guile-ssh, etc.)
have their .so absolute file name hard-coded, which sidesteps this
problem entirely.  I recommend doing that for guile-yamlpp as well.

That said, it would probably make sense to arrange for =E2=80=98with-extens=
ions=E2=80=99
to set GUILE_EXTENSIONS_PATH.

Ludo=E2=80=99.

PS: Your MUA sets =E2=80=9CMail-Followup-To: bug-guix@HIDDEN=E2=80=9D, whi=
ch is kinda
    annoying because that=E2=80=99s the wrong address when replying to a bu=
g.
    :-)
Information forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Tomas Volf <~@wolfsden.cz>
To: bug-guix@HIDDEN
Subject: with-extensions does not add native extensions to the load path
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable


The documentation for `with-extensions' says:

> In the same vein, sometimes you want to import not just pure-Scheme
> modules, but also =E2=80=9Cextensions=E2=80=9D such as Guile bindings to =
C libraries
> or other =E2=80=9Cfull-blown=E2=80=9D 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.

=2D-8<---------------cut here---------------start------------->8---
(use-modules (gnu packages guile-xyz))
(define test
  (with-extensions (list guile-yamlpp)
    (program-file "test" #~(use-modules (yamlpp)))))
=2D-8<---------------cut here---------------end--------------->8---

And try to run it:

=2D-8<---------------cut here---------------start------------->8---
$ /gnu/store/nq0sahcnph5sxms4irq4inv2hq2hfbzr-test
Backtrace:
          19 (primitive-load "/gnu/store/nq0sahcnph5sxms4irq4inv2hq2hfbzr-t=
est")
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) (hygi=
ene 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 _ #:r=
enamer _ # _)
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=E2=80=A6>)
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-p=
ath? _ # _ # _ # =E2=80=A6)
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"
=2D-8<---------------cut here---------------end--------------->8---

Have a nice day,
Tomas

=2D-=20
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

--=-=-=
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--=-=-=--
Acknowledgement sent to Tomas Volf <~@wolfsden.cz>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#74532; Package guix. Full text available.
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