| Re: Compiling shared libraries for use with call_external on a Mac [message #19701] |
Wed, 12 April 2000 00:00 |
arkos
Messages: 11
Registered: July 1998
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Junior Member |
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An addition to what I asked below:
I can add a "dummy" main() to the C file, and produce something
which appears to be a shared library. However, when I try to
use call_external from the IDL side, I get the error:
% CALL_EXTERNAL: Error loading sharable executable.
Symbol: testing_external, File =
Documents:Arkos:SMS:PLOT:test_external_libs
symbol was not found
% Execution halted at: TEST_CALL_EXTERNAL 18
Documents:Arkos:SMS:PLOT:test_call_external.pro
% $MAIN$
I don't know if I am doing something wrong on the C side in
creating the shared library, or on the IDL side in the
implementation, so any suggestions would be appreciated.
Thanks again,
-- Greg
For those interested, the code consists of:
** C**
#include <stdio.h>
int testing_external(int argc, char *argv[]);
int testing_external(int argc, char *argv[])
{
printf("Test.\n");
return(1);
}
void main(void)
{
}
** IDL **
PRO test_call_external
MESSAGE, ' begins!', /INFORMATIONAL
a = call_external("test_external_libs","testing_external", /i_value)
MESSAGE, ' complete!', /INFORMATIONAL
RETURN
END
> A question for those out there who have used call_external in IDL with
> (hopefully) C subroutines on the Macintosh.
>
> I have an older version of Metrowerks Codewarrior (IDE 1.6.3, CW 9),
> and have set the Project type to shared library, in the preferences
> for the project. However, it doesn't seem to want to compile and
> produce the shared library (it keeps looking for main(), while
> the C file I'm compiling only contains a collection of subroutines).
--
Gregory G. Arkos Institute for Space Research
arkos@NOSPAMphys.ucalgary.ca Department of Physics and Astronomy
Voice : +1 403 220 6958 The University of Calgary
FAX : +1 403 282 5016 Calgary, Alberta, CANADA T2N 1N4
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