[patch] Use dlsym instead of glXGetProcAddress in xdriinfo

[Ian Romanick]

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Eric Anholt wrote:
> On Tue, 2005-11-22 at 17:58 -0500, Felix Kühling wrote:
> 
>>Right now there doesn't seem to be the one patch that makes everybody
>>happy. The dlsym version isn't portable and the glXGetProcAddressARB has
>>been reported (by you) to be broken on AMD64. At this point there is
>>really nothing I can do. I'm basically waiting for someone with AMD64 to
>>track down that issue. Until then from my POV the current solution is at
>>least as good as any of the other ones that have been proposed so far.
> 
> So, good news.  I went to test if I still had segfaults with
> glXGetProcAddressARB and noticed that there were warnings about nested
> extern declaration (i.e. no prototype), and warnings that pointers were
> being cast to int.  After adding #define GLX_GLXEXT_LEGACY at the top,
> it works.  I must have just missed those with the first time I tried it.

I did some digging through my notes on this issue.  Wasn't there also
some problem related to the use of GCC's "alias" extension?

> Patch attached.  Sound sane?

That looks like the right solution to me.
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