loadlibrary and preprocessor #define

Hi!

My basic problem is that I cannot get loadlibrary to define a symbol to be set when parsing an .h-file. Is there any way to set such a define from Matlab that I have missed?

As a workaround I tried to make loadlibrary use a special .h-file that in itself set the defines like this and in turn includes the real .h-file:

// matlabIncludeFile.h

#define MATLAB_ONLY
#include "realIncludeFile.h"

// realIncludeFile.h

#ifdef MATLAB_ONLY
...
//What I want matlab to see
...
#else
...
//What I want all other compilers to see
...
#endif

But here it seems like a bug because realIncludeFile.h is parsed as if MATLAB_ONLY is not defined. If I move #define MATLAB_ONLY from matlabIncludeFile.h to realIncludeFile.h it works but that of course defeats my goal of having a specific define set when parsing via Matlab.

I have other options but they don't appeal to me for various reasons such as:

• Different include directories for matlab and not-matlab parsing
• A #ifndef and compiler constant in commandline of all other compilers.

Any suggestions to solve my original problem? For example, does Matlab set up a specfic predefined macros such as GCC's _GNUC_?