SWIG memory problems when using different USE_POINT_Z_M settings

[Tamas Szekeres]

Hi Folks,

Since we are planning to do the SWIG invocation and the compilation
independently we should  ensure to pass the same commandline
parameters that affect the layout of the various mapserver structures.
Here are some bugs might be related to this problem:

http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1881
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1890

Currently the only problematic option is USE_POINT_Z_M which affects
the members of the pointObj structure. By using different
USE_POINT_Z_M setting during the swig generation and the compilation
the related application will candidate to suffer from memory
corruption problems.

I think it would be sufficient at least to generate an error at compile time
when the SWIG was invoked with different USE_POINT_Z_M setting.
For example we could add the followings to mapscript.i


#ifdef USE_POINT_Z_M
%{
#ifndef USE_POINT_Z_M
#error "USE_POINT_Z_M not definied!"
#endif
%}
#else
%{
#ifdef USE_POINT_Z_M
#error "USE_POINT_Z_M definied!"
#endif
%}
#endif


Any objections to apply such things?

Best regards,

Tamas