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Re: Call_external [message #9287 is a reply to message #1268]

Thu, 12 June 1997 00:00

Inigo Garcia
Messages: 13
Registered: June 1997

Junior Member

Harald Frey wrote:
>
> I have changed from VMS to UNIX and now I got a problem with
> call_external and
> I'm not sure if it is an IDL or a UNIX problem. I work under
> { sparc sunos unix 4.0.1c}.
>
> The FORTRAN program example.f according to the User's Guide 18-14
>
> C --------------------------
> subroutine sum_array(array,n,sum)
>
> integer*4 n
> real*4 array(n),sum
>
> sum=0.0
> do i=1,n
> sum=sum+ array(i)
> print*, sum, array(i)
> enddo
>
> return
> end
> C --------------------------
>
> And the IDL program test_call.pro
>
> ; -------------------------
> pro test_call
>
> x=findgen(10)
> s=call_external('example.so','_sum_array_',x,n_elements(x),/ f_value)
>
> end
> ; ------------------------
>
> Compiling the FORTRAN program with (User's Guide 18-21)
>
> f77 -c -pic example.f
> ld -o example.so example.o
>
> Gives the error message
>
> % ld -o example.so example.o
> Undefined first referenced
> symbol in file
> __e_wsle example.o
> __s_wsle_nv example.o
> __do_l_out example.o
> ld: fatal: Symbol referencing errors. No output written to example.so
>
> Trying
> ld -G -o example.so example.o
>
> compiles without error message but then in IDL I get
>
> IDL>.r test_call
> IDL> test_call
> % CALL_EXTERNAL: Error loading sharable executable.
> Symbol: _sum_array_, File = example.so
> ld.so.1: /usr/local/idl/bin/bin.solaris2/idl: fatal:
> dlsym:
> can't find symbol: _sum_array_
> % Execution halted at: TEST_CALL 4 test_call.pro
> % $MAIN$
>
> Where is the problem?
>
> Harald Frey
> Space Sciences Laboratory
> University of California
> Berkeley, CA 94720
> hfrey@ssl.berkeley.edu

Hi Harald:

The compiling to use a Fortran subroutine from IDL is the second one you
mention, the "ld -G -o example.so example.o". The error you get is due
to the fact that IDL does not find the entry "_sum_array_" in the file
"example.so". The most probable thing is that the entry is called
"sum_array_", at least in Solaris is that way. To verify the enties that
one of your subroutines have, you can use the command "nm example.o".

Anyway, with your program written like this nothing is going to work,
because you need to use an Interface between IDL and the Fortran
Routine. How to do this is explained in the Online Help of IDL, in the
Advanced Development Guide, CALL_EXTERNAL Section. The example files are
in the /external/sharelib/ directory of the main IDL directory.

Enjoy it !!

I~nigo.
--
\\|//
(o o)
+-----------------------oOOo-(_)-oOOo----------------------- --+
| I~nigo Garcia Ruiz |
| Kapteyn Instituut Phone: +31-(0)50-3634083 |
| Landleven 12 Fax: +31-(0)50-363 |
| 9747 AD GRONINGEN (Netherlands) e-mail: iruiz@astro.rug.nl |
+----------------------------------------------------------- --+

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[Message index]

		CALL_EXTERNAL By: dean on Wed, 18 August 1993 09:38
		Re: Call_external By: Inigo Garcia on Thu, 12 June 1997 00:00
		Re: call_external By: Vap User on Wed, 05 August 1998 00:00
		Re: call_external By: rivers on Wed, 12 August 1998 00:00
		Re: CALL_EXTERNAL By: menakkis on Mon, 22 February 1999 00:00
		Re: CALL_EXTERNAL By: ashmall on Wed, 03 March 1999 00:00
		Re: CALL_EXTERNAL By: Nigel Wade on Mon, 22 July 2002 01:44
		Re: CALL_EXTERNAL By: ronn on Sat, 20 July 2002 06:25
		Re: CALL_EXTERNAL By: Craig Markwardt on Fri, 19 July 2002 15:00
		Re: CALL_EXTERNAL By: zaygula on Wed, 31 July 2002 07:35
		Re: CALL_EXTERNAL By: Mark Rivers on Tue, 30 July 2002 19:26
		Re: CALL_EXTERNAL By: Randall Skelton on Wed, 05 February 2003 00:47
		Re: Call_external By: Karl Schultz on Wed, 10 March 2004 11:02
		Re: Call_external By: Haje Korth on Wed, 10 March 2004 09:20
		Re: Call_external By: Dr Paul Ducksbury on Wed, 10 March 2004 06:39
		Re: Call_external By: scuaic on Thu, 11 March 2004 14:32
		Re: Call_external By: Haje Korth on Wed, 10 March 2004 05:11
		Re: Call_external By: Pepijn Kenter on Wed, 10 March 2004 05:19
		Re: Call_external By: Dr Paul Ducksbury on Wed, 10 March 2004 05:02
		Re: call_external By: Haje Korth on Sun, 17 February 2013 05:53
		Re: call_external By: Katerina Yakimenko on Thu, 07 March 2013 05:55
		Re: call_external By: David Fanning on Thu, 07 March 2013 06:42
		Re: call_external By: Katerina Yakimenko on Thu, 07 March 2013 06:23
		Re: call_external By: David Fanning on Thu, 07 March 2013 06:10

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