[PATCH 180/180] Look for $PREFIX/etc/X11/xorg.conf before /etc/X11/xorg.conf

[Bill Spitzak]

I realize now that this patch will only fix local (ie $PREFIX) installs 
of xwayland, and that something else needs to be done so that real 
system installs of wayland will work.

The problem is if an /etc/X11/xorg.conf file exists, Xorg --wayland 
attempts to read it. If the text in the file causes the wayland backend 
to not work then it exits. This file may very well exist because the 
same machine is being used to run a legacy X server as well as wayland.

I now think the best solution is to make Xorg --wayland use a different 
configuration file, perhaps /etc/X11/wayland.conf. This is especially 
true because I believe a non-existent config file will often work and 
this is the easiest way to indicate that when an xorg.conf file exists.

Would love to have some feedback:

1. Is this really a bug or am I missing something obvious?

2. Is the idea of a different conf file the right one? Is my proposed 
name the right one?

3. If so is the best way to have weston add a --config switch when 
running Xorg, or modify the source code for Xorg?

4. Is rearranging the search path (ie this patch) in Xorg to look in 
$PREFIX first a good idea anyway? I and others on this list certainly 
expected it to work this way and it took some time before I figured out 
it was literally doing things differently than any other Linux software.