https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61296
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> --- (In reply to Jakub Jelinek from comment #9) > (In reply to H.J. Lu from comment #8) > > Do you have a testcase to show decreasing DATA_ALIGNMENT would break > > backwards compatibility with older gcc versions? > > Older GCC versions used DATA_ALIGNMENT (what is now DATA_ABI_ALIGNMENT) on > MEM_ALIGN etc., and gradually more and more optimizations relied on it, even > when the data was defined in some other compilation unit or was comdat or > could be interposed. See e.g. > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56564#c9 I still don't see that limit DATA_ALIGNMENT to MAX (ABI alignment, natural alignment) will cause additional ABI problems which don't exist today.
