------- Comment #2 from rguenth at gcc dot gnu dot org 2007-10-20 09:47 ------- The standard puts all the burden on the implementation (See 6.7.2.1/10). The GCC manual in turn says the behavior is specified by the ABI (4.9 Structures, unions, enumerations, and bit-fields), which would be the sysv ABI which I don't have handy right now.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33823
