load-extension fails with "file not found" message

load-extension fails with "file not found" message

[Panicz Maciej Godek]

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Hi,
I recently made update of ubuntu, and I've been trying to get my
guile-based framework to work. First, the guile 2.0.11 installed through
Guix caused core dumps on initialization, so I switched to the version from
the ubuntu repository.

Now I've been trying to load some of the extensions needed for my program
to run. However, when I try to load-extension, I get the error:
ERROR: In procedure load-extension:
ERROR: In procedure dynamic-link: file: "physics", message: "file not found"

I also tried to pass the full path, either with or without the ".so"
suffix, but it keeps failing.
What could be the possible reason?

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Re: load-extension fails with "file not found" message

[neil]

   I don't know, but this rings a bell. I suggest running under strace and
   looking at the stat syscalls, to see where Guile is looking.

        Neil

   (from a phone that only does top posting - sorry!)

   From: Panicz Maciej Godek
   Sent: Thursday, 12 May 2016 08:21
   To: guile-user@gnu.org
   Subject: load-extension fails with "file not found" message

   Hi,
   I recently made update of ubuntu, and I've been trying to get my
   guile-based framework to work. First, the guile 2.0.11 installed
   through Guix caused core dumps on initialization, so I switched to the
   version from the ubuntu repository.
   Now I've been trying to load some of the extensions needed for my
   program to run. However, when I try to load-extension, I get the error:
   ERROR: In procedure load-extension:
   ERROR: In procedure dynamic-link: file: "physics", message: "file not
   found"
   I also tried to pass the full path, either with or without the ".so"
   suffix, but it keeps failing.
   What could be the possible reason?

Re: load-extension fails with "file not found" message

[Panicz Maciej Godek]

2016-05-12 10:01 GMT+02:00 <neil@ossau.homelinux.net>:

> I don't know, but this rings a bell. I suggest running under strace and
> looking at the stat syscalls, to see where Guile is looking.
>
> Thanks, brilliant!
It seems that guile finds the proper library file, but when it tries to
open it, dlopen cannot find a dependency library, so -- faced with a
failure -- guile searches for another library file, and eventually fails in
doing so:

access("./physics.so", R_OK)            = -1 ENOENT (No such file or
directory)
access("./scum/physics.so", R_OK)       = 0
open("./scum/physics.so", O_RDONLY|O_CLOEXEC) = 13
...
open("./tls/x86_64/libode.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such
file or directory)
open("./tls/libode.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
open("./x86_64/libode.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file
or directory)
...
open("/lib/libode.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or
directory)
open("/usr/lib/libode.so.1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file
or directory)
munmap(0x7f7c30915000, 98393)           = 0
munmap(0x7f7c3092e000, 2266520)         = 0
open("/usr/lib/x86_64-linux-gnu/physics.la", O_RDONLY) = -1 ENOENT (No such
file or directory)
...


I think that the error message is a bit confusing -- it would be much more
helpful if it informed that it found some file (or files), but none of them
satisfied its dependencies.

Anyway, thanks again!

Regards,
Panicz



> *From: *Panicz Maciej Godek
> *Sent: *Thursday, 12 May 2016 08:21
> *To: *guile-user@gnu.org
> *Subject: *load-extension fails with "file not found" message
>
> Hi,
> I recently made update of ubuntu, and I've been trying to get my
> guile-based framework to work. First, the guile 2.0.11 installed through
> Guix caused core dumps on initialization, so I switched to the version from
> the ubuntu repository.
>
> Now I've been trying to load some of the extensions needed for my program
> to run. However, when I try to load-extension, I get the error:
> ERROR: In procedure load-extension:
> ERROR: In procedure dynamic-link: file: "physics", message: "file not
> found"
>
> I also tried to pass the full path, either with or without the ".so"
> suffix, but it keeps failing.
> What could be the possible reason?
>
>
>
>

Re: load-extension fails with "file not found" message

[Ludovic Courtès]

Panicz Maciej Godek <godek.maciek@gmail.com> skribis:

> I think that the error message is a bit confusing -- it would be much more
> helpful if it informed that it found some file (or files), but none of them
> satisfied its dependencies.

Agreed, this silly error message is a “known issue” in libltdl, though I
forgot the details of why it doesn’t do any better.  You’ll make many
people happy if you fix this!  ;-)

Ludo’.

Re: load-extension fails with "file not found" message

[Matt Wette]

> On May 12, 2016, at 5:01 AM, Panicz Maciej Godek <godek.maciek@gmail.com> wrote:
> It seems that guile finds the proper library file, but when it tries to
> open it, dlopen cannot find a dependency library, so -- faced with a
> failure -- guile searches for another library file, and eventually fails in
> doing so:

Have you tried to set LD_LIBRARY_PATH environment variable to include the directory where the .so lives?

Matt

Re: load-extension fails with "file not found" message

[Panicz Maciej Godek]

2016-05-19 14:38 GMT+02:00 Matt Wette <matt.wette@gmail.com>:

>
> > On May 12, 2016, at 5:01 AM, Panicz Maciej Godek <godek.maciek@gmail.com>
> wrote:
> > It seems that guile finds the proper library file, but when it tries to
> > open it, dlopen cannot find a dependency library, so -- faced with a
> > failure -- guile searches for another library file, and eventually fails
> in
> > doing so:
>
> Have you tried to set LD_LIBRARY_PATH environment variable to include the
> directory where the .so lives?
>


Yes. I had to set it so that it contained the location of the dependency
library. Doing that worked well, but the error message wasn't particularly
helpful for resolving that issue.