[GD-General] Clean way of generalizing CDECL

[Brian H. <ho...@bo...>]

I'd like to be able specify CDECL in a cross-platform manner.  On most 
x86 compilers there's just the __cdecl keywod:

void __cdecl foo( int x, int y, int z );

GCC, of course, does it completely differently:

void foo( int x, int y, int z ) __attribute((cdecl));

So a simple #define won't work.  Now, you can do a kind of convoluted 
thing using a define, but damn, it's REAL ugly.

Is there a cleaner way of doing this?