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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106868] [12 Regression] Bogus
 -Wdangling-pointer warning with -O1
Date: Mon, 12 Dec 2022 11:20:33 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106868

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:ad6ace70ba38d2052eeb5adb9672d33f59867be0

commit r12-8972-gad6ace70ba38d2052eeb5adb9672d33f59867be0
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Dec 5 10:13:13 2022 +0100

    tree-optimization/106868 - bogus -Wdangling-pointer diagnostic

    The testcase shows we mishandle the case where there's a pass-through
    of a pointer through a function like memcpy.  The following adjusts
    handling of this copy case to require a taken address and adjust
    the PHI case similarly.

            PR tree-optimization/106868
            * gimple-ssa-warn-access.cc
(pass_waccess::gimple_call_return_arg_ref):
            Inline into single user ...
            (pass_waccess::check_dangling_uses): ... here and adjust the
            call and the PHI case to require that ref.aref is the address
            of the decl.

            * gcc.dg/Wdangling-pointer-pr106868.c: New testcase.

    (cherry picked from commit d492d50f644811327c5976e2c918ab6d906ed40c)=