Follow-up Comment #5, bug #20951 (project wesnoth):

Since the reporter seems to not be interested in providing additional
information in the forums [1], I'm posting this here as well.

[1] http://forums.wesnoth.org/viewtopic.php?p=557270#p557270

I would suspect that there's a problem with compiler optimizations at work
here. If my memory serves, the default used with scons is -O2, whereas cmake
uses -O3 for Release builds. I personally use -O3 -march=native with scons
here, running gcc version 4.7.2 and a full amd64 Debian wheezy system, and I
have not seen anything like this so far with 1.11.x or 1.10.x. From what I
read, Ubuntu 13.04 (raring)'s default is gcc 4.7.3 [2]. I expect that both the
Debian wheezy and raring gcc packages include additional patches that could
have something to do with this bug.

[2] http://packages.ubuntu.com/raring/gcc

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