[Xcb] XCB on *BSD: many pthread-related problems

[Diego 'Flameeyes' Pettenò]

So, I've been trying to find why X didn't start after having it built fine 
with xcb enabled... and I've seen there's a little big mess with it on 
FreeBSD (and DragonFly and OpenBSD at least, not sure on NetBSD, but it's 
likely to be the same).

Background: on *BSD systems there's more than one library providing pthread 
functions, the result is that the -pthread flag (as well as -lpthread) does 
not link the threading libraries when producing a shared object, but only 
when the final executable is generated, so that you don't end up with two 
different threading implementations in a single executable (that will result 
in a crash); when linking a non-threaded program to a threaded library, you 
_need_ to pass -pthread to it to let it build correctly.

libX11 wasn't threaded previously, but libxcb and libxcb-xlib are now. The 
result is that programs linking to libX11 will now need to use -pthread to 
finalise the link, or they won't work. The patches I've sent today will fix 
this problem for the packages using pkg-config to locate libX11 (mostly 
modular-x packages right now, I suppose), but for everything else, a lot of 
patching will be needed for xcb to be usable on FreeBSD (unless of course 
Ports will try again to cut the edge and tinker with packages without fixing 
the issue properly).

I'll try to provide some quick ways to work around the issue, fixing the 
packages I can find broken on my system, but I'd sure welcome some help :) Or 
even just an acknowldgement that I'm not doing this pointlessy.

-- 
Diego "Flameeyes" Pettenò - http://farragut.flameeyes.is-a-geek.org/
Gentoo/Alt lead, Gentoo/FreeBSD, Video, Sound, ALSA, PAM, KDE, CJK, Ruby ...
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