Bugzilla Bug 260676

The available version of emul-linux-x86-xlibs contains a libX11 which is
compiled without XCB support.

If the 64bit system libX11 is compiled with xcb enabled, loading 32bit libX11
into an app using xcb enabled libX11 it will crash the application with a xlib
xcb locking assertion failure.

One example is media-sound/lmms on amd64 with VST support enabled. This app is
able to load Windows VST plugins via wine, and embeds the GUI into it's own GUI
using Qt4 functions. If LIBXCB_ALLOW_SLOPPY_LOCK is unset, lmms will crash
right away due to the 32bit libX11 not having xcb enabled.

It tested this on OpenSUSE and Arch linux in a VM, both providing a 32bit
libX11 with xcb enabled, and it runs fine there. I haven't been able to test it
on Gentoo due to the lack of documentation about the way the emul packages get
built.

This is a rare case of course, so it would be interesting to know if the
majority of amd64 users with X installed do have xcb enabled or not. Because if
most have xcb enabled, I'd say that the emul xlibs should have xcb support too.

Minor issue regarding the easy LIBXCB_ALLOW_SLOPPY_LOCK=1 workaround, but
anyways, having a xcb enabled 64bit libX11 and a non-xcb 32bit one causes
inconsistencies here.

Currently this issue is the cause for "media-sound/lmms vst" in
base/package.use.mask though...

Reproducible: Always

Steps to Reproduce:
1. override vst p.use.mask and install media-sound/lmms with vst enabled
2. load some VST .dll in lmms


Actual Results:  
lmms crashes with a locking assertion failure

Expected Results:  
it should work

http://bugs.gentoo.org/show_bug.cgi?id=255117

Same issue I guess.

Nevermind the vmware issue, it doesn't really have anything to do with it.

Reassigning to amd64 herd.

With libX11-1.2 and libxcb-1.2, much of this will become a non-issue.

I am running a 64-bit gentoo system with libxcb-1.4-r1 and libX11 1.3.2 and I
recently ran into a problem running a 32-bit binary of new puzzle action game
called QuantZ. 32-bit binary can be download @
http://www.reddit.com/r/linux_gaming/comments/a2kux/quantz_ported_to_linux_please_help_us_test_the/

After running QuantZ i get this error:
./QuantZ: error while loading shared libraries: libxcb.so.1: cannot open shared
object file: No such file or directory

Is there any possibility that app-emulation/emul-linux-x86-xlibs's libX11 will
gain libxcb support?