https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69990
--- Comment #5 from Alan Modra <amodra at gmail dot com> --- I don't think we can make the decl with the larger alignment prevail. Aren't we stuck with "c" due to it being referenced by the constructor? It goes like: 1) "c" is referenced in a constructor, thus make_decl_rtl for "c" 2) make_decl_rtl puts "c" in an anchor block, 3) anchor block contents can't move, so "c" alignment can't change, 4) "a" can be changed by ipa_increase_alignment, and the alias info isn't yet available so there's no way to stop that happening, 5) "a" therefore must be prevented from aliasing "c". I guess testing for exact equality of alignment is too strict, and I should also allow an alias from smaller to larger alignment if the larger alignment is a multiple of the smaller.
