[Xcb] update to libxcb 1.12 breaks 32bit applications

Wed Jun 8 19:46:44 UTC 2016

Am 08.06.2016 um 21:34 schrieb Rémi Cardona:
> Does gcc's UBSan report anything? It could still very well be a bug in xcb.

never heard of it, sounds interesting.
i compiled libxcb with gcc6 with -O2 and -fsanitize=undefined (thats
what i understood from [0]) but there is no runtime error message.
did i do it wrong?

[0]
https://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/

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