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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107952] tree-object-size: inconsistent size
 for flexible arrays nested in structs
Date: Fri, 27 Jan 2023 07:46:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107952

--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 26 Jan 2023, qinzhao at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107952
>=20
> --- Comment #19 from qinzhao at gcc dot gnu.org ---
> (In reply to rguenther@suse.de from comment #11)
>=20
> > > Agreed, usually where these extension should be documented?
> >=20
> > They are usually documented in doc/extend.texi
>=20
> there is one section on "Zero Length" (Arrays of Length Zero), which ment=
ioned
> this a little bit:
>=20
> "A structure containing a flexible array member, or a union containing
> such a structure (possibly recursively), may not be a member of a
> structure or an element of an array.  (However, these uses are
> permitted by GCC as extensions.)"
>=20
> We might add one more sub-section inside this section to clarify how GCC
> handles the situation when a structure containing a flexible array member
> becomes a member of another structure.=20
>=20
> is that a good place to put the documentation?

Yes, I think so.=