[Bug middle-end/22275] [3.4/4.0/4.1/4.2 Regression] bitfield layout change (regression?)

["mark at codesourcery dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #31 from mark at codesourcery dot com  2006-01-18 23:28 -------
Subject: Re:  [3.4/4.0/4.1/4.2 Regression] bitfield
 layout change (regression?)

steven at gcc dot gnu dot org wrote:
> ------- Comment #30 from steven at gcc dot gnu dot org  2006-01-18 23:08 -------
> We should at least avoid introducing a third variant of how we lay out these
> nasty zero-sized friends.  People actually use them.  For example Wine uses
> them to enforce compatible alignment and data layout with MS Windows
> datastructure.  Wine has a bunch of #ifdefs spread around in its sources to
> make it work with the pre- and post-GCC 3.4 layout.  Adding a third would drive
> those poor people nuts.

I agree -- but I don't think we're talking about a third variant.
Michael's patch looks to me like it will restore the pre-3.4 behavior,
which everyone agrees makes more sense.  My issue with respect to
maximum_field_alignment doesn't really apply to pre-4.0 toolchains,
since they didn't have default structure packing for targets, AFAICT.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22275