__GL_TLS_GET
printf("__GL_TLS_GET(0) = %p\n", __GL_TLS_GET(0));
printf("__GL_TLS_GET(1) = %p\n", __GL_TLS_GET(1));
printf("__GL_TLS_GET(2) = %p\n", __GL_TLS_GET(2));
printf("__GL_TLS_GET(3) = %p\n", __GL_TLS_GET(3));
printf("__GL_TLS_GET(4) = %p\n", __GL_TLS_GET(4));
printf("__GL_TLS_GET(5) = %p\n", __GL_TLS_GET(5));
printf("__GL_TLS_GET(6) = %p\n", __GL_TLS_GET(6));
printf("__GL_TLS_GET(7) = %p\n", __GL_TLS_GET(7));