[Mesa3d-users] 32bit vs 64bit question regarding glLightfv (one works, the other crashes)

[Tobias B. <bu...@ne...>]

Hello,

I have the problem that calling glLightfv works with the 32bit version
of mesa but fails with the 64bit version on a x86-64 Linux system:

$ cat test.c
#include <GL/gl.h>

int main ()
{
  GLfloat ambient[4]      = {0.2, 0.2, 0.2, 1.0};
  glLightfv(GL_LIGHT0, GL_AMBIENT,  ambient);
  return 0;
}

$ gcc test.c -lGL && ./a.out
Segmentation fault
$ gcc -m32 test.c -lGL && ./a.out
$

(Reduced example from http://www.xcrysden.org/.) I failed to see what
goes wrong here as the syntax looks fine, but I also find it unlikely
that it fails both with an old Fedora 6 with
mesa-libGL-devel-6.5.1-9.fc6 and on an openSUSE Factory with
Mesa-7.7-5.3.x86_64, which somehow implies a user error instead of a
library problem.

 * * *

For completeness, if I use glutInit(); ....; glutCreateWindow(...)
before calling glLightfv(), it does not crash with mesa-64bit. Xcrysden
is to convoluted for me to really see what is called where. Is there
anything which I should tell the Xcryden developers to handle differently?

Tobias