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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/101836] __builtin_object_size(P->M, 1) where M is an
 array and the last member of a struct fails
Date: Tue, 14 Jun 2022 16:17:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101836

--- Comment #28 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Qing Zhao from comment #27)
> > Wouldn't this be -fno-strict-flex-arrays, i.e. the current behaviour?
>=20
> Yes, it=E2=80=99s the same.  =3D0 is aliased with -fno-strict-flex-arrays.

That is indeed what we do for many options, -fno-whatever is alias to
-fwhatever=3D0 (or -fwhatever=3Dsomething for options which take enums and =
not
numbers).=