[ODE] Visual Studio project files

[Rodrigo Hernandez]

J. Perkins wrote:

>PS - The reason you can't use preprocessor variable to disable
>features is because Win32 DLLs need a .def file which lists all
>exported symbols. If you disable OPCODE with a preprocessor directive,
>you also need to remove all trimesh related symbols from the .def
>file. Premake gets around this by creating a .def file on the fly.
>  
>
Actually, thats not true, you dont need a def file, just define the DLL 
macro as done in config.h, and add a preprocessor definition of 
DLL_EXPORT for the DLL project.

#if defined(DLL_EXPORT) && defined(WIN32)
#define DLL __declspec( dllexport )
#elif !defined(DLL_EXPORT) && defined(WIN32)
#define DLL __declspec( dllimport )
#else
#define DLL
#endif

Thats currently how MinGW generates the shared symbols for a DLL build.

Cheers!