[Mesa-dev] demos / glew configure bug

[Dan Nicholson]

On Tue, Jul 13, 2010 at 7:42 AM, Brian Paul <brianp at vmware.com> wrote:
> On 07/13/2010 08:07 AM, Brian Paul wrote:
>>
>> I'm setting up the Mesa demos repo on a new system. autogen.sh fails
>> because it can't find GLEW. I think autogen is looking for GLEW in
>> /usr/include/GL/ and /usr/lib/libGLEW.a instead of using the copy of
>> GLEW in the demos tree itself.
>>
>> Dan, can you fix that?
>>
>>
>> $ ./autogen.sh
>> [...]
>> checking pkg-config is at least version 0.9.0... yes
>> checking for GL... yes
>> checking GL/glut.h usability... no
>> checking GL/glut.h presence... no
>> checking for GL/glut.h... no
>> checking for glutInit in -lglut... no
>> checking for GLEW... no
>> checking GL/glew.h usability... no
>> checking GL/glew.h presence... no
>> checking for GL/glew.h... no
>> configure: error: GLEW required
>
> Digging deeper...  The issue is actually in the configure script (I think).
>  Even after copying libGLEW.a from Mesa 7.8.2 into /usr/lib/libGLEW.a (which
> is the same as /usr/lib64/) configure is failing:
>
> [...]
> checking pkg-config is at least version 0.9.0... yes
> checking for GL... yes
> checking GL/glut.h usability... no
> checking GL/glut.h presence... no
> checking for GL/glut.h... no
> checking for glutInit in -lglut... no
> checking for GLEW... no
> checking GL/glew.h usability... yes
> checking GL/glew.h presence... yes
> checking for GL/glew.h... yes
> checking for glewInit in -lGLEW... no
> configure: error: GLEW required
>
> I wrote a test program that just calls glewInit() and compiled it with 'gcc
> foo.c -lGLEW -lGL -o foo' and it worked fine.

I'm traveling right now, but I believe the problem is that mesa does
not install a glew.pc pkgconfig file. You can create one from the
glu.pc example (or one of the others) and install it in
/usr/lib/pkgconfig (for x86) or /usr/lib64/pkgconfig (for x86-64).

The check for glew in the demos configure script would be something like:

PKG_CHECK_MODULES([GLEW], [glew])

This would search for glew.pc and then the flags would be stored in
GLEW_CFLAGS and GLEW_LIBS.

I don't have a chance to fix this for another week or so, but it needs
a little fixing on the mesa side for glew to be a fully installed
library like gl or glu.

--
Dan