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From: "qinzhao at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
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 15:00:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101836

--- Comment #25 from qinzhao at gcc dot gnu.org ---
So, based on all the discussion so far, how about the following:

** add the following gcc option:

-fstrict-flex-arrays=3D[0|1|2|3]

when -fstrict-flex-arrays=3D0:
treat all trailing arrays as flexible arrays. the default behavior;

when -fstrict-flex-arrays=3D1:
Only treating [], [0], and [1] as flexible array;

when -fstrict-flex-arrays=3D2:
Only treating [] and [0] as flexible array;

when -fstrict-flex-arrays=3D3:
Only treating [] as flexible array; The strictest level.=20

any comments?=