The problem is that in cp/decl.c:duplicate_decls, when merging two decls
for one variable, the code uses a memcpy to copy all fields in
tree_decl_common *except* those in tree_common (which are handled
manually).  Since the patch moves the user_align and packed_flag bits
from tree_decl_common into tree_base (which is part of tree_common),
these bits -which used to be copied automatically by the mempy- are now
no longer handled automatically and should have been handled manually.
No such code was added however.

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firefox fails to build from source with Linaro toolchain
https://bugs.launchpad.net/bugs/604874
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