guile can't find dynamically loaded library

guile can't find dynamically loaded library

[Michael Vanier]

Hi,

I've been walking through the guile info documentation, specifically the
section on defining your own guile extensions.  This is for guile-1.6
running on a Debian GNU/Linux system.  I am unable to get guile to find the
location of the shared library that I created (libguile-bessel.so).  I have
tried everything I can think of.  I have put the file into /usr/lib and it
still couldn't find it!  I setenv'd LTDL_LIBRARY_PATH to the current
directory; no dice (is LTDL a misprint?).  I always get the following
message:

guile> (load-extension "libguile-bessel" "init_bessel")
standard input:1:1: In procedure dynamic-link in expression (load-extension "libguile-bessel" "init_bessel"):
standard input:1:1: file: "libguile-bessel", message: "file not found"
ABORT: (misc-error)

Type "(backtrace)" to get more information or "(debug)" to enter the debugger.
guile> 

I suspect that the documentation is incorrect.  Can you clarify what's
needed to inform guile of where a shared library is?

Mike





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Re: guile can't find dynamically loaded library

[Marius Vollmer]

Michael Vanier <mvanier@cs.caltech.edu> writes:

> I have put the file into /usr/lib and it still couldn't find it!

This is (another) bug in libltdl.  It first tries the ".la" extenstion
and then should continue with the ".so" extension.  However, it
incorrectly stops when no ".la" file could be found.

A workaround is to use

  (load-extension "libguile-bessel.so" "init_bessel")

for the time being.

We will release a Guile 1.6.1 shortly that will always use a libltdl
with this bug fixed.

Thanks for reporting this!

-- 
GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405


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Re: guile can't find dynamically loaded library

[Michael Vanier]

Well, it's even more hosed that you realize :-(  When I do what you say, it
reports that it can't find libguile-bessel.so in /usr/lib.  When I copy
libguile-bessel.so into /usr/lib, it reports that it can't find it in
/usr/local/lib (the next path in my LD_LIBRARY_PATH).  And so forth.  When
I manually set my LD_LIBRARY_PATH to just /usr/lib, it complains that it
can't find libguile-bessel.so in /lib. It seems to be impossible to make it
happy.  Output looks like this:

guile> (load-extension "libguile-bessel.so" "init_bessel")
standard input:1:1: In procedure dynamic-link in expression (load-extension "libguile-bessel.so" "init_bessel"):
standard input:1:1: file: "libguile-bessel.so", message: "/lib/libguile-bessel.so: cannot open shared object file: No such file or directory"
ABORT: (misc-error)

Type "(backtrace)" to get more information or "(debug)" to enter the debugger.


Thanks for your help,

Mike

> From: Marius Vollmer <mvo@zagadka.ping.de>
> Date: 03 Oct 2002 20:34:11 +0200
> 
> Michael Vanier <mvanier@cs.caltech.edu> writes:
> 
> > I have put the file into /usr/lib and it still couldn't find it!
> 
> This is (another) bug in libltdl.  It first tries the ".la" extenstion
> and then should continue with the ".so" extension.  However, it
> incorrectly stops when no ".la" file could be found.
> 
> A workaround is to use
> 
>   (load-extension "libguile-bessel.so" "init_bessel")
> 
> for the time being.
> 
> We will release a Guile 1.6.1 shortly that will always use a libltdl
> with this bug fixed.
> 
> Thanks for reporting this!
> 
> -- 
> GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405
> 


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Re: guile can't find dynamically loaded library

[Paul Jarc]

Michael Vanier <mvanier@cs.caltech.edu> wrote:
> Well, it's even more hosed that you realize :-(  When I do what you say, it
> reports that it can't find libguile-bessel.so in /usr/lib.  When I copy
> libguile-bessel.so into /usr/lib, it reports that it can't find it in
> /usr/local/lib (the next path in my LD_LIBRARY_PATH).  And so forth.

libltdl is misinterpreting the return value of access().  This bug has
been fixed in Guile before, but apparently the fix didn't make its way
into all the CVS branches.


paul


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Re: guile can't find dynamically loaded library

[Marius Vollmer]

Michael Vanier <mvanier@cs.caltech.edu> writes:

> Well, it's even more hosed that you realize :-(

Oops, did you configure Guile with "--enable-ltdl-install"?  Sorry, I
forgot to tell you about this.

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Re: guile can't find dynamically loaded library

[Michael Vanier]

That fixed it.  I still had to specify the .so extension, but that's OK for
now.   I didn't even have to specify an LTDL_LIBRARY_PATH environment
variable ;-)

I'm pretty happy to see guile catching up with other scripting languages.
I'm especially happy with how easy it is to write extensions; I don't know
of any other scripting language that has such a trivially simple extension
mechanism.

Thanks,

Mike

> From: Marius Vollmer <mvo@zagadka.ping.de>
> Date: 08 Oct 2002 23:30:14 +0200
> 
> Michael Vanier <mvanier@cs.caltech.edu> writes:
> 
> > Well, it's even more hosed that you realize :-(
> 
> Oops, did you configure Guile with "--enable-ltdl-install"?  Sorry, I
> forgot to tell you about this.
> 
> -- 
> GPG: D5D4E405 - 2F9B BCCC 8527 692A 04E3  331E FAF8 226A D5D4 E405
> 


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Re: guile can't find dynamically loaded library

[Marius Vollmer]

Michael Vanier <mvanier@cs.caltech.edu> writes:

> I'm pretty happy to see guile catching up with other scripting languages.
> I'm especially happy with how easy it is to write extensions; I don't know
> of any other scripting language that has such a trivially simple extension
> mechanism.

I'm very happy to hear this!

-- 
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