[Xcb] [Bug 104769] libxcb-1.12: optimizations above -O1 causing multiple applications to stop working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104769

--- Comment #5 from Uli Schlachter <psychon at znc.in> ---
The thread starts at
https://lists.freedesktop.org/archives/xcb/2016-June/010795.html.
https://lists.freedesktop.org/archives/xcb/2016-June/010815.html concludes (I
think) that according to gdb there should be no crash.
https://lists.freedesktop.org/archives/xcb/2016-June/010819.html says that
nothing crashes with gcc 5.3.
https://lists.freedesktop.org/archives/xcb/2016-June/010828.html is the last
mail in the thread where the reporter will provide further data "tomorrow"
(that's almost two years ago).

To add to Emil's suggestions: Since the link above says that this was
introduced with libxcb 1.12, you could also git bisect the xcb repository to
find out where "things go downhill" (although this might be hard since other
libraries might use newer libxcb features).

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