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
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