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AC_CHECK_ALIGNOF fails when cross-compiling with gcc >= 4.5

From: Michael Olbrich
Subject: AC_CHECK_ALIGNOF fails when cross-compiling with gcc >= 4.5
Date: Wed, 25 Apr 2012 10:56:01 +0200
User-agent: Mutt/1.5.20 (2009-06-14)


when cross-compiling with gcc >= 4.5 (I think), AC_CHECK_ALIGNOF fails to
detect the alignment. This happens because the compiler fails with "error:
storage size of ‘test_array’ isn’t constant" instead of succeeding.
Using __builtin_offsetof helps. Patch attached. I'm not quite sure when
__builtin_offsetof should be used, but it is used in the Linux kernel for
gcc 4.x, so I think this is correct.


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Attachment: 0001-fix-AC_CHECK_ALIGNOF-when-cross-compiling-with-gcc-4.patch
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