[Xcb] print backtraces in case an assert fails inside xlib/xcb

[Donnie Berkholz]

On Thu, 07 Jun 2007 16:32:58 -0700
Barton C Massey <bart at cs.pdx.edu> wrote:
> (Note that most binary-only X apps won't be affected by this
> issue, since most of them are dynamically linked against X
> libraries and themselves don't call any Xlib locking
> functions.  The assertion failure is actually a rare problem
> now that we have the X libraries mostly fixed and have Java
> mostly fixed; users with those fixes seem generally happy
> with the locking assertions turned on as far as I know.)

FWIW, here's the Gentoo bug related to XCB issues (Look at the "depends
on" area for the bugs it's related to):

http://bugs.gentoo.org/show_bug.cgi?id=174434

The two main issues are 1) Java and 2) libtool .la contamination causing
the switch between XCB and no-XCB to be a lot more painful than it
should be.

Thanks,
Donnie
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