xsrc/42754: why i915_drm doesn't work

[jakllsch%kollasch.net@localhost]

>Number:         42754
>Category:       xsrc
>Synopsis:       two differing definitions of struct __GLcontextModesRec
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    xsrc-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 06 03:05:00 +0000 2010
>Originator:     Jonathan A. Kollasch
>Release:        NetBSD 5.0_STABLE 2010-01-17
>Organization:
        
>Environment:
        
        
System: NetBSD siwenna.kollasch.net 5.0_STABLE NetBSD 5.0_STABLE (SIWENNA) #6: 
Wed Feb 3 05:39:11 UTC 2010 
root%siwenna.kollasch.net@localhost:/local/siwenna/20100117/src/sys/arch/i386/compile/SIWENNA
 i386
Architecture: i386
Machine: i386
>Description:
i915_drm.so and libOSmesa.so which at some point come in contact
with each others data structures have differing ideas of
sizeof(GLvisual) and thus a almost-completely-wrong idea of offsets into
and sizeof(GLcontext).  This leads to things like glxinfo dumping core.

gdb shows sizeof(GLvisual) as 188 in libOSmesa.so, and 208 in i915_drm.so.
I believe the larger definition of GLvisual comes from glproto's glcore.h,
the smaller from MesaLib's mtypes.h.

>How-To-Repeat:
build.sh release netbsd-5, run glxinfo on a i915drm(4)-enabled kernel
and hardware.
>Fix:
Figure out the right header file to use where.

>Unformatted: