Re: [gentoo-dev] libGLcore error

[Lars Pechan]

Very short summary:

There is a problem with nvidia opengl acceleration. AFAIK it only happens when 
using the latest binutils (2.12.x). I believe it's caused by nvidia's 
libGL.so not having been built with -lgcc_s as a linker directive. Previous 
versions of binutils would have made up for that by re-exporting the 
necessary symbols from libgcc_s but when using the latest version that no 
longer happens.

Two phased workaround:

At linktime, i.e when building/doing emerges:
Make sure xfree's opengl implementation is active, i.e. that the libGL.so 
symlink points to xfree's libGL.so, not nvidia's. 

opengl-update xfree
emerge pkg
opengl-update nvidia 

(using LDFLAGS=-lgcc_s emerge pkg should also work). 

At runtime:
Either add /lib/libgcc_s.so.1 to /etc/ld.so.preload or use LD_PRELOAD on 
libgcc_s. If you go for the ld.so.preload option you need to make sure you 
re-enter the line of text after doing an rsync as rsync overwrites it

Not perfect by any means but gets the job done and is really quite painless.

For more in-depth info, check out the gcc3 forum.

/Lasse

On Tue, 04 Jun 2002 07:03, Prashanth Aditya Susarla wrote:
> I emerged nvidia-kernel and nvidia-glx and configured everything to work
> properly (in the sense that I am working with X/KDE without any hassle as
> far as regular operation is concerned). However there's the following
> error in the XFree86 log file:-
>
> dlopen: /usr/lib/libGLcore.so.1: undefined symbol: __divdi3
>
> due to which mplayer etc. won't run. I even have a feeling I won't be able
> to quake now :-(. I see no reason why this should break. Does it have
> something to do with the compiler/optimization flags again? (gcc-3.1-r5,
> -march=athlon-tbird -mmmx -m3dnow -O3 -pipe -fomit-frame-pointer)
>
> Regards,
> Prashanth Aditya Susarla
>
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