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Bug 238

Summary: dri doesn't work on linux (r200)
Product: SDL Reporter: Matthias Geissert <matthias.geissert>
Component: videoAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 1.2.9   
Hardware: Other   
OS: Linux   

Description Matthias Geissert 2006-05-22 08:18:23 UTC 
The file SDL_x11gl.c loads libGL.so via SDL_LoadObject(). This function adds RTLD_NOW as a second argument to dlopen. The problem is that libGL.so should be opened with RTLD_GLOBAL as well (at least to my knowledge). If you omit RTLD_GLOBAL libGL fails to load r200_dri.so with unresolved symbol _glapi_Dispatch. Hence, dri doesn't work. Adding RTLD_GLOBAL to the second argument of dlopen solves this problem. 

This is also present in 1.2.10.

Btw, I am using glibc 2.3.6, xorg 7.0, Mesa 6.4.2
Comment 1 Ryan C. Gordon 2006-05-23 22:01:22 UTC 
Hmm...generally you don't want dlopen() to use RTLD_GLOBAL unless forced to (like this situation) so we shouldn't change this universally inside LoadObject. Sam, any ideas on how to approach this? Is this arguably a bug in DRI?

--ryan.
Comment 2 Matthias Geissert 2006-05-24 07:54:10 UTC 
See http://dri.sourceforge.net/doc/DRIuserguide.html, section 11.5. There is written that you need to use RTLD_GLOBAL, since, otherwise, nested open of dynamic libraries doesn't work. However, This is necassary in this case, since libGL opens the hardware-specific driver/library. I hope this helps you.
Comment 3 Sam Lantinga 2006-06-19 23:52:29 UTC 
This is fixed in subversion, thanks!