[Xquartz-dev] X11 vs freeglut 2.6.0-rc1

[Jack Howarth]

   While attempting to build some test packaging for
the new freeglut 2.6.0-rc1 release on Intel Darwin,
I discovered that their build fails in the freeglut
demo programs with the error...

Making all in smooth_opengl3
gcc -DHAVE_CONFIG_H -I. -I../../..   -I/sw/include -I../../../include -I/usr/X11R6/include -O3 -DTARGET_HOST_POSIX_X11 -c -o smooth_opengl3-smooth_opengl3.o `test -f 'smooth_opengl3.c' || echo './'`smooth_opengl3.c
smooth_opengl3.c:101: error: redefinition of typedef 'PFNGLGENBUFFERSPROC'
/usr/X11R6/include/GL/gl.h:1884: error: previous declaration of 'PFNGLGENBUFFERSPROC' was here
smooth_opengl3.c:104: error: redefinition of typedef 'PFNGLBINDBUFFERPROC'
/usr/X11R6/include/GL/gl.h:1882: error: previous declaration of 'PFNGLBINDBUFFERPROC' was here
smooth_opengl3.c:107: error: redefinition of typedef 'PFNGLBUFFERDATAPROC'
/usr/X11R6/include/GL/gl.h:1886: error: previous declaration of 'PFNGLBUFFERDATAPROC' was here
smooth_opengl3.c:110: error: redefinition of typedef 'PFNGLCREATESHADERPROC'
/usr/X11R6/include/GL/gl.h:1939: error: previous declaration of 'PFNGLCREATESHADERPROC' was here
smooth_opengl3.c:113: error: redefinition of typedef 'PFNGLSHADERSOURCEPROC'
/usr/X11R6/include/GL/gl.h:1940: error: previous declaration of 'PFNGLSHADERSOURCEPROC' was here
smooth_opengl3.c:116: error: redefinition of typedef 'PFNGLCOMPILESHADERPROC'
/usr/X11R6/include/GL/gl.h:1941: error: previous declaration of 'PFNGLCOMPILESHADERPROC' was here
smooth_opengl3.c:119: error: redefinition of typedef 'PFNGLCREATEPROGRAMPROC'
/usr/X11R6/include/GL/gl.h:1942: error: previous declaration of 'PFNGLCREATEPROGRAMPROC' was here
smooth_opengl3.c:122: error: redefinition of typedef 'PFNGLATTACHSHADERPROC'
/usr/X11R6/include/GL/gl.h:1943: error: previous declaration of 'PFNGLATTACHSHADERPROC' was here
smooth_opengl3.c:125: error: redefinition of typedef 'PFNGLLINKPROGRAMPROC'
/usr/X11R6/include/GL/gl.h:1944: error: previous declaration of 'PFNGLLINKPROGRAMPROC' was here
smooth_opengl3.c:128: error: redefinition of typedef 'PFNGLUSEPROGRAMPROC'
/usr/X11R6/include/GL/gl.h:1945: error: previous declaration of 'PFNGLUSEPROGRAMPROC' was here
smooth_opengl3.c:131: error: redefinition of typedef 'PFNGLGETSHADERIVPROC'
/usr/X11R6/include/GL/gl.h:1969: error: previous declaration of 'PFNGLGETSHADERIVPROC' was here
smooth_opengl3.c:134: error: redefinition of typedef 'PFNGLGETSHADERINFOLOGPROC'
/usr/X11R6/include/GL/gl.h:1972: error: previous declaration of 'PFNGLGETSHADERINFOLOGPROC' was here
smooth_opengl3.c:137: error: redefinition of typedef 'PFNGLGETPROGRAMIVPROC'
/usr/X11R6/include/GL/gl.h:1970: error: previous declaration of 'PFNGLGETPROGRAMIVPROC' was here
smooth_opengl3.c:140: error: redefinition of typedef 'PFNGLGETPROGRAMINFOLOGPROC'
/usr/X11R6/include/GL/gl.h:1973: error: previous declaration of 'PFNGLGETPROGRAMINFOLOGPROC' was here
smooth_opengl3.c:143: error: redefinition of typedef 'PFNGLGETATTRIBLOCATIONPROC'
/usr/X11R6/include/GL/gl.h:1981: error: previous declaration of 'PFNGLGETATTRIBLOCATIONPROC' was here
smooth_opengl3.c:146: error: redefinition of typedef 'PFNGLVERTEXATTRIBPOINTERPROC'
/usr/X11R6/include/GL/gl.h:1930: error: previous declaration of 'PFNGLVERTEXATTRIBPOINTERPROC' was here
smooth_opengl3.c:149: error: redefinition of typedef 'PFNGLENABLEVERTEXATTRIBARRAYPROC'
/usr/X11R6/include/GL/gl.h:1931: error: previous declaration of 'PFNGLENABLEVERTEXATTRIBARRAYPROC' was here
smooth_opengl3.c:152: error: redefinition of typedef 'PFNGLGETUNIFORMLOCATIONPROC'
/usr/X11R6/include/GL/gl.h:1974: error: previous declaration of 'PFNGLGETUNIFORMLOCATIONPROC' was here
smooth_opengl3.c:155: error: redefinition of typedef 'PFNGLUNIFORMMATRIX4FVPROC'
/usr/X11R6/include/GL/gl.h:1966: error: previous declaration of 'PFNGLUNIFORMMATRIX4FVPROC' was here
smooth_opengl3.c: In function 'main':
smooth_opengl3.c:425: error: 'GLUT_FORWARD_COMPATIBLE' undeclared (first use in this function)
smooth_opengl3.c:425: error: (Each undeclared identifier is reported only once
smooth_opengl3.c:425: error: for each function it appears in.)
smooth_opengl3.c:425: error: 'GLUT_DEBUG' undeclared (first use in this function)
make[4]: *** [smooth_opengl3-smooth_opengl3.o] Error 1
make[3]: *** [all-recursive] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1

This appears to be coming from the definitions that exist in our gl.h. These definitions don't exist in the
gl.h of Fedora 10 but are in glext.h instead. I noticed we have the comment...

/* The following macros exist to address conflicts between the names given to
 * function pointers by the MESA API and OpenGL.framework's API.
 */

We should probably make the freeglut developers aware of this issue so we don't have to
heavily patch the freeglut 2.6.0 release. Any particular comments on this?
                        Jack