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Problems compiling shared libraries [message #47750]

Thu, 02 March 2006 07:55

johnpeterkelly@gmail. is currently offline

johnpeterkelly@gmail.
Messages: 6
Registered: March 2006

Junior Member

I'm having a consistent problem compiling shared libraries for use with
the call_external() command. I've tried using the make_dll function as
well as compiling the code manually with cc or gcc. Here's what I do:

in idl:
make_dll, 'tester', 'simple_return'

Where tester.c is the name of my file, and simple_return is the name of
a function that just returns a number.

or at the command prompt:
cc -c -fPIC tester.c
cc -shared tester.o -o tester.so

When I try in IDL:
x = call_external('tester.so', 'simple_return')

I get:
% CALL_EXTERNAL: Error loading sharable executable.
Symbol: simple_return, File = tester.so
tester.so: cannot open shared object file: No such
file or directory

It would seem IDL can't find the .so file. What really confuses me is
that I have another library file that I downloaded to run some LAPACK
routines on older version of IDL (note: not compiled on my computer)
which is sitting the same directory as tester.so. When I run:

x = call_external('liblidl.so', 'c_eigen_all', matrix, 3l, e_vec,e_val)

It works fine. This leads me to the conclusion that it's not that it
can't find the file, but rather it doesn't recognize it as a library.
If it helps, I'm running IDL 6.2 and my machine has a 64 bit processor
(this has led to some completely different problems, but it might be
relevant).

Thanks in advance for your help.

--John

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		Problems compiling shared libraries By: johnpeterkelly@gmail. on Thu, 02 March 2006 07:55
		Re: Problems compiling shared libraries By: Nigel Wade on Fri, 03 March 2006 04:27
		Re: Problems compiling shared libraries By: johnpeterkelly@gmail. on Thu, 02 March 2006 10:57

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