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From: "lukas.graetz@tu-darmstadt.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/111643] __attribute__((flatten)) with -O1 runs out of
 memory (killed cc1)
Date: Fri, 06 Oct 2023 21:31:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111643

--- Comment #11 from Lukas Gr=C3=A4tz <lukas.graetz@tu-darmstadt.de> ---
(In reply to Alexander Monakov from comment #10)
> (In reply to Lukas Gr=C3=A4tz from comment #9)
> > I also wondered whether
> >=20
> > int bar_alias (void) { return bar_original(); }
> >=20
> > could be a portable alternative to attribute alias. Except that current=
 GCC
> > does not translate it that way.
>=20
> That's because function addresses are significant and so
>=20
>   &bar_alias =3D=3D &bar_original
>=20
> must evaluate to false, but would be true for aliases.
>=20
> In theory compilers could do better by introducing fall-through aliases:
> https://gcc.gnu.org/wiki/
> cauldron2019talks?action=3DAttachFile&do=3Dview&target=3Dfallthrough-alia=
ses.pdf

Thanks a lot! I haven't thought about function addresses. Is there hope that
fall-through aliases get into gcc? Then my perhaps my instrumentation
fall-through would also be possible to implement.=