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            <b><a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO - libxcb-1.12: optimizations above -O1 causing multiple applications to stop working"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=104769#c5">Comment # 5</a>
              on <a class="bz_bug_link 
          bz_status_NEEDINFO "
   title="NEEDINFO - libxcb-1.12: optimizations above -O1 causing multiple applications to stop working"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=104769">bug 104769</a>
              from <span class="vcard"><a class="email" href="mailto:psychon@znc.in" title="Uli Schlachter <psychon@znc.in>"> <span class="fn">Uli Schlachter</span></a>
</span></b>
        <pre>The thread starts at
<a href="https://lists.freedesktop.org/archives/xcb/2016-June/010795.html">https://lists.freedesktop.org/archives/xcb/2016-June/010795.html</a>.
<a href="https://lists.freedesktop.org/archives/xcb/2016-June/010815.html">https://lists.freedesktop.org/archives/xcb/2016-June/010815.html</a> concludes (I
think) that according to gdb there should be no crash.
<a href="https://lists.freedesktop.org/archives/xcb/2016-June/010819.html">https://lists.freedesktop.org/archives/xcb/2016-June/010819.html</a> says that
nothing crashes with gcc 5.3.
<a href="https://lists.freedesktop.org/archives/xcb/2016-June/010828.html">https://lists.freedesktop.org/archives/xcb/2016-June/010828.html</a> 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).</pre>
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