Re: Problems with GHCi and NVIDIA drivers on Ubuntu 12.04

I created an issue for this on github:
https://github.com/haskell-opengl/OpenGL/issues/42

On Tue, Jul 23, 2013 at 2:53 AM, Sven Panne <[email protected]> wrote:
> When I try to run OpenGL examples on Ubuntu 12.04 with the latest
> Haskell platform (2013.2.0.0, incl. GHC 7.6.3), the following happens:
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~/haskell-platform-2013.2.0.0/packages/GLUT-2.4.0.0/examples/RedBook$
> runhaskell Smooth.hs
> freeglut (Smooth.hs):  ERROR:  Internal error <FBConfig with necessary
> capabilities not found> in function fgOpenWindow
> X Error of failed request:  BadWindow (invalid Window parameter)
>   Major opcode of failed request:  4 (X_DestroyWindow)
>   Resource id in failed request:  0x0
>   Serial number of failed request:  37
>   Current serial number in output stream:  40
> ----------------------------------------------------------------------------------
>
> I am using an x86_64 Ubuntu 12.04 distro (with some minor corporate
> modifications, but they probably don't matter here) with NVIDIA
> drivers. This means that the dynamic linker will load NVIDIA's
> libGL.so, as can be seen e.g. here:
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~$ ldd /usr/lib/x86_64-linux-gnu/libglut.so | grep libGL
> libGL.so.1 => /usr/lib/nvidia-current/libGL.so.1 (0x00007f1ddc76e000)
> svenpanne@svenpanne:~$ dpkg -S /usr/lib/nvidia-current/libGL.*
> nvidia-current: /usr/lib/nvidia-current/libGL.so
> nvidia-current: /usr/lib/nvidia-current/libGL.so.1
> nvidia-current: /usr/lib/nvidia-current/libGL.so.310.51
> ----------------------------------------------------------------------------------
>
> This is OK, and this is the libGL.so which will be found by 'ld' when
> one simply specifies '-lglut' for compilation via gcc. This can be
> seen e.g. when tracing things during the linking stage of the "Hello,
> world!" example from the Red Book:
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~/redbook$ strace -f gcc hello.o -lglut 2>&1 |
> grep 'libglut\|libGL' | grep -v ENOENT
> [pid  7782] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> {st_mode=S_IFREG|0644, st_size=287720, ...}) = 0
> [pid  7782] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 8
> [pid  7782] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 13
> [pid  7782] stat("/usr/lib/nvidia-current/libGL.so.1",
> {st_mode=S_IFREG|0644, st_size=1099504, ...}) = 0
> [pid  7782] open("/usr/lib/nvidia-current/libGL.so.1", O_RDONLY) = 14
> [pid  7782] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 5
> [pid  7782] open("/usr/lib/nvidia-current/libGL.so.1", O_RDONLY) = 12
> [pid  7782] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 8
> ...
> ----------------------------------------------------------------------------------
>
> But things get weird when one explicitly specifies '-lGLU and -lGL' in
> addition to '-lglut' (something GHC's package system is actually doing
> behind the scenes, too):
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~/redbook$ strace -f gcc hello.o -lglut -lGLU -lGL
> 2>&1 | grep 'libglut\|libGL' | grep -v ENOENT
> [pid  7943] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> {st_mode=S_IFREG|0644, st_size=287720, ...}) = 0
> [pid  7943] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 8
> [pid  7943] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libGLU.so",
> {st_mode=S_IFREG|0644, st_size=449168, ...}) = 0
> [pid  7943] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libGLU.so",
> O_RDONLY) = 9
> [pid  7943] stat("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libGL.so",
> {st_mode=S_IFREG|0644, st_size=390352, ...}) = 0
> [pid  7943] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libGL.so",
> O_RDONLY) = 10
> [pid  7943] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libglut.so",
> O_RDONLY) = 4
> [pid  7943] open("/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/libGL.so",
> O_RDONLY) = 5
> ...
> ----------------------------------------------------------------------------------
>
> This happens because of there is a symbolic link in the standard
> library search path for gcc, which is part of a Mesa package:
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~$ ll /usr/lib/x86_64-linux-gnu/libGL.so
> lrwxrwxrwx 1 root root 13 Jun 18 22:54
> /usr/lib/x86_64-linux-gnu/libGL.so -> mesa/libGL.so
> svenpanne@svenpanne:~$ dpkg -S /usr/lib/x86_64-linux-gnu/libGL.so
> libgl1-mesa-dev: /usr/lib/x86_64-linux-gnu/libGL.so
> ----------------------------------------------------------------------------------
>
> Funnily enough, when you run the application later, it will use
> NVIDIA's libGL.so, because the dynamic linker consults
> /etc/ld.so.{cache,conf} and of course does *not* look into gcc's
> library search path:
>
> ----------------------------------------------------------------------------------
> svenpanne@svenpanne:~/redbook$ ldd a.out | grep libGL
> libGL.so.1 => /usr/lib/nvidia-current/libGL.so.1 (0x00007f7841b34000)
> ----------------------------------------------------------------------------------
>
> So in a nutshell: If you are explicit about your library dependencies,
> things are inconsistent on Ubuntu. Because of this, GHCi loads Mesa's
> libGL.so (found via 'gcc --print-names), which does not work with
> NVIDIA drivers.
>
> The question is: What to do about this? Adding /usr/lib/nvidia-current
> to OpenGLRaw's library-dirs is wrong, because this will fail when you
> e.g. temporarily switch to Mesa for OpenGL. I have the very strong
> feeling that this is a Ubuntu bug: The link
> '/usr/lib/x86_64-linux-gnu/libGL.so => mesa/libGL.so' is simply wrong
> in the presence of NVIDIA drivers, and one should fix this by making
> it point to  /usr/lib/nvidia-current/libGL.so. A quick Google search
> found that other people have similar problems:
>
>    https://answers.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+question/182181
>    http://techtidings.blogspot.de/2012/01/problem-with-libglso-on-64-bit-ubuntu.html
>    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=630527
>
> Any opinions/insights?
>
> Cheers,
>    S.
>
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