> If I don't use gcc -O2 flag to compile dri driver,quake3 can run smoothly.
> But when I enable -O2 flag,the driver is broke. 
> Quake3 always displays the last frame of the last q3 startup until the menu 
> comes up.
> 
Umm, could you tell us what version of gcc you are using? If you
are using the gcc-3.2.x series, it will produce faulty code with
the -O2 flag.

-Steve


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