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When cross-compiling with gcc >= 4.5 AC_CHECK_ALIGNOF fails to detect the correct alignment. Without a previous AC_CHECK_TYPE for the same type, the alignment is silently set to '0'. This makes sure that configure fails and reports the problem. Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de> https://bugzilla.gnome.org/show_bug.cgi?id=674483
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