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Question on call_external
| Question on call_external [message #48963] |
Wed, 07 June 2006 02:00 |
alban
Messages: 5
Registered: November 2005
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Junior Member |
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Hi all,
I am using call_external to call several C function from IDL.
Everything has just worked fine so far, and I am very pleased with the
results. I installed in a local folder the FFTW library -several tests
I made gave that a complex-valued 1D FFT was quite faster than IDL's-
and would like to use it.
Compiling and linking like I had always done -Linux machine-
gcc -o *.so *.c -shared -lm -I*/fftw*/include/ -O3
seems to work fine. But when using the library in an IDL function I get
the following message
% Compiled module: GET_FILE_NAMES.
% Compiled module: READ_MOTION.
% CALL_EXTERNAL: Error loading sharable executable.
Symbol: call_owh, File = */*.so
*/*.so: undefined symbol: fftw_malloc
% Execution halted at: I_PRO_TR 103 */*.pro
% $MAIN$
which is a clear indicator something is not working when linking the
fftw library, since IDL is unable to find just the functions included
in this library. Performing a two-step generation like the following
yields good results.
gcc -c */*.c -O3 -fPIC
ld *.o -shared -o *.so
It is evident I do not quite know precisely what I am doing, even if it
happens to work fine. Could anyone put a light into my darkness?
Many thanx.
Marc
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