[Swig-devel] [ swig-Bugs-2849219 ] extern char* something[]; globals not handled correctly

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Bugs item #2849219, was opened at 2009-09-02 15:39
Message generated for change (Settings changed) made by wsfulton
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Category: python
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Michael Zalokar (mzalokar)
>Assigned to: William Fulton (wsfulton)
Summary: extern char* something[];   globals not handled correctly

Initial Comment:
I'm working on moving from python 1.1 to 1.3.  The example works with swig 1.1p5, but not with swig 1.3.29 that came with my Linux distribution.  If I'm doing something wrong I didn't find the correct way in the documentation.  It looks like in swig 1.3 is not recognizing "char* somthing[]" as a "char **" like it used to in 1.1.

I've included a small test example.


First what works:

bash-3.2$ swig -version

SWIG Version 1.1 (Patch 5)
Copyright (c) 1995-98
University of Utah and the Regents of the University of California

Compiled with c++
bash-3.2$ make clean all
rm -f *.o *.so
swig -python -shadow test.i
Generating wrappers for Python
gcc -fPIC test_wrap.c -o test_wrap.o -c -I /fnal/ups/prd/python/v2_6_2_E_0/include/python2.6/
gcc -shared -o testcmodule.so  test.c test_wrap.o
gcc -shared -o _testmodule.so  test.c test_wrap.o
bash-3.2$ python -c "import test; print test.cvar.something"
['blah']




Now what does not work:

bash-3.2$ swig -version

SWIG Version 1.3.29

Compiled with g++ [x86_64-redhat-linux-gnu]
Please see http://www.swig.org for reporting bugs and further information
ash-3.2$ make clean all
rm -f *.o *.so *.doc *.pyc
swig -python -shadow test.i
test.i:33: Warning(462): Unable to set dimensionless array variable
gcc -fPIC test_wrap.c -o test_wrap.o -c -I /fnal/ups/prd/python/v2_6_2_E_0/include/python2.6/
gcc -shared -o testcmodule.so  test.c test_wrap.o
gcc -shared -o _testmodule.so  test.c test_wrap.o
bash-3.2$ python -c "import test; print test.cvar.something"
<Swig Object of type 'char **' at 0x2b2ca4666de0>


----------------------------------------------------------------------

>Comment By: William Fulton (wsfulton)
Date: 2009-11-14 15:04

Message:
Variables use the varout typemap for Python in swig-1.3. Also the type to
use is more appropriate. Please change your typemap to:

%typemap (varout) char *[] { ... }

then it works.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101645&aid=2849219&group_id=1645