On Fri, 2024-10-25 at 23:38 +0200, Thorsten Glaser wrote: > On Fri, 25 Oct 2024, John Paul Adrian Glaubitz wrote: > > > as m68k has supported 32-bit alignment through the "-malign-int" > > switch for a long time. > > That switch constitutes a fundamental ABI change, even if > the effect is limited. > > Question is, do we need a kernel change for this at all? > Is there anything in the kernel/userland interface that > gets affected by this, or do these APIs use sufficient > explicit padding? Has anyone looked at this?
James Le Cuirot (chewi) has created a Gentoo/m68k chroot with 4-byte alignment and most of the stuff just worked from what I remember. > If we know that the answer is no, the plan could look > different from a yes answer, so… > > Additionally… has anyone done the simple “enable -malign-int > in GCC, begin rebuilding stuff, first glibc, then others, > see what breaks”? Is there sufficient effect that we cannot > incrementally change over? Yes, see above. > (Another question: does -malign-int switch to natural > alignment for all types, i.e. 64 bit for llong and double, > etc. or are we going to have to change GCC first as well > to avoid more surprises?) I assume so. Chewi, can you answer that question? Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
