trying to debug why i wasn't able to run flightgear on my laptop, i think i found a problem with SGLookupFunction. the problem is that we call dlclose() before we return the pointer to the GL function, and, if i understand things correctly, this invalidates the handle and the address might not be valid anymore (on my laptop i kept getting core dumps).
anyway the fix is very simple: instead of calling dlopen() on libGL and then passing the libGL handle to dlsym() one can simply invoke dlsym on RTLD_DEFAULT (which is a special pseudo-handler that will find the first occurrence of the desired symbol using the default library search order). now i can run flightgear on both my laptop (with a radeon mobility card) and on my desktop (nvidia card) and i think the clouds actually look much better.
Unfortunately RTLD_DEFAULT isn't supported on all platforms (it isn't supported in IRIX anyhow). I think that if what you describe is the problem this really is a bug at your side. What happens is that the function pointer is copied to ftpr. So dlcose() should never be able to have any effects on this copy ??
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