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Subject: bug#74532: with-extensions does not add native extensions to the load path
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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 =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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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Tomas Volf <~@wolfsden.cz>
Subject: bug#74532: Acknowledgement (with-extensions does not add native
 extensions to the load path)
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Date: Mon, 25 Nov 2024 17:51:01 +0000

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Message sent to bug-guix@HIDDEN:

Subject: bug#74532: with-extensions does not add native extensions to the load path
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
In-Reply-To: <871pyzdwzi.fsf@HIDDEN> (Tomas Volf's message of "Mon, 25
 Nov 2024 18:49:53 +0100")
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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.
    :-)

Message sent to bug-guix@HIDDEN:

Subject: bug#74532: with-extensions does not add native extensions to the load path
Resent-From: Tomas Volf <~@wolfsden.cz>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guix@HIDDEN
Resent-Date: Mon, 02 Dec 2024 23:41:01 +0000
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Cc: 74532 <at> debbugs.gnu.org
From: Tomas Volf <~@wolfsden.cz>
In-Reply-To: <877c8n94kl.fsf@HIDDEN> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'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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--=-=-=
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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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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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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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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.

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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

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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

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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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"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.

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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.

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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

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Cc: Z572 <zhengjunjie@HIDDEN>, 74532 <at> debbugs.gnu.org, Tomas Volf <~@wolfsden.cz>, Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>, Z572 <zhengjunjie@HIDDEN>, Timo Wilken <guix@HIDDEN>
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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

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Subject: bug#74532: closed (with-extensions does not add native extensions
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Your message dated Tue, 01 Apr 2025 09:49:15 +0200
with message-id <87ldskgw3o.fsf_-_@HIDDEN>
and subject line Re: bug#74532: with-extensions does not add native extensi=
ons to the load path
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.

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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 =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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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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Date: Tue, 01 Apr 2025 09:49:15 +0200
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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!


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To: Tomas Volf <~@wolfsden.cz>
Subject: bug#74532: closed (Re: bug#74532: with-extensions does not add
 native extensions to the load path)
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Your bug report

#74532: with-extensions does not add native extensions to the load path

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74532 <at> debbugs.gnu.org.

--=20
74532: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74532
GNU Bug Tracking System
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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!


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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 =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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Your message dated Tue, 08 Apr 2025 22:59:19 +0200
with message-id <D91K54C00YVA.1OA0N0IEIH0QK@HIDDEN>
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@HIDDEN)


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74532: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74532
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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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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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Subject: Close #74532
From: "Timo Wilken" <guix@HIDDEN>
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Somehow, this issue was magically reopened.

See the stanza beginning with "Did not alter fixed versions and reopened" a=
t
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74532>.


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To: Tomas Volf <~@wolfsden.cz>
Subject: bug#74532: closed (Close #74532)
Message-ID: <handler.74532.D74532.174414597725050.notifdone <at> debbugs.gnu.org>
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Your bug report

#74532: with-extensions does not add native extensions to the load path

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74532 <at> debbugs.gnu.org.

--=20
74532: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74532
GNU Bug Tracking System
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Somehow, this issue was magically reopened.

See the stanza beginning with "Did not alter fixed versions and reopened" a=
t
<https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D74532>.


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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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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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reopen 74532
quit

Look, I get that I must be annoying with the constant reopening of this
issue, but I promise, this is the last time.  When someone closes it
again, I will just give up.  But as I wrote in the control message last
time (where I have CC-ed Ludovic), I do not believe this issue is
resolved.  Great, guile-yamlpp works now, but that is not this issue is
about.

It is fine if you think that with-extensions should *not* touch
GUILE_EXTENSIONS_PATH.  I disagree, but fair enough, that is life.
However, it would be nice to know why you think handling just 2 out of 3
environment variable controlling the loading in Guile is desirable.

I get that Guix is a volunteer run project, and no one owns me an
explanation or something, but still...

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