Apologies if this is a FAQ or otherwise known, but, the following test
program fails to compile for me:
=============================
#include <osg/StateSet>
#include <GLUT/glut.h>
#include <osg/Drawable>
int main(int argc, char** argv)
{
return 0;
}
=============================
I'm on Mac, change <GLUT/glut.h> to <GL/glut.h> or similar if required.
As it turns out, I don't even want GLUT support in the program I was
trying to build but there's a genuine issue here - glut.h behaves very
badly: at its end, it #undef-s APIENTRY.
So when <osg/Drawable> is included, <osg/GL> has already been included
(and guarded against another include, by defining _osg_gl), but
APIENTRY has been undefined so never gets expanded again - the end
result is I end up with APIENTRY in the pre-processed source and
obviously compilation fails.
This took me a while to figure out, so maybe it could be documented?
But there is an actual (possible) fix - remove the multiple include
guard from <osg/GL>. This should be fine because it's a very small
file that only consists of pre-processor actions. gl.h would still
only be pulled in once, but APIENTRY would get set regardless.
Regards,
James
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