Re: #define conflict with swig

[Jon H. Davis]

On Sun, 2005-08-21 at 13:20 -0400, John W. Eaton wrote:
> On 21-Aug-2005, jon wrote:
> 
> |     I've been attempting to embed both octave and python in a third program
> | using the swig interface generator.  Using the usual oct.h includes in 
> | an octave.i
> | file, I get
> | 
> | address@hidden:~/develop/octave-py $ swig -c++   -python octave.i
> | octave/config.h:768: Error: Macro 'DYNAMIC_CAST' redefined,
> | /usr/share/swig1.3/swig.swg:382: Error: previous definition of 
> | 'DYNAMIC_CAST'.
> | 
> |     It appears part of the magic swig does uses DYNAMIC_CAST cleverly, 
> | and that
> | collides with octave's version.
> | 
> |     Is there anything to do other than getting octave sources, and 
> | rebuilding after using sed
> | to effect a s/DYNAMIC_CAST/_DYNAMIC_CAST/g on the whole octave source 
> | tree ? 
> | That would probably work, but make the project unmaintainable.
> 
> I used these macros because I wanted to be able to make Octave work on
> systems where the C++ compiler did not yet implement dynamic_cast,
> reinterpret_cast, and static_cast.  These days, I think we can assume
> that the C++-style casts will be available in any compiler that is
> capable of compiling Octave.  So maybe now would be a good time to
> replace these macros in Octave with the actual C++-style casts in the
> source?
> 
> jwe
     I don't know enough about C++ compiler variation to comment on
that, although it suggests the same could be said about the swig
sources. I did notice that in the octave headers those *_CAST macros
seem to be effectively no-ops on my systems.
 
       For now, I ran the sed on a private copy of the octave/*.h so I
can try things out. I'm predicting that the main problems are going to
arise from both python and octave doing reference counting. Thanks.
 
       Jon 
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
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