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Subject: [Bug c++/97573] Implement C++20 [depr.arith.conv.enum]
Date: Mon, 04 Oct 2021 16:34:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97573

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Marek Polacek <mpolacek@gcc.gnu.org>:

https://gcc.gnu.org/g:2dda00b734888d3b53ac91160083b5c6cd5ca5c8

commit r12-4148-g2dda00b734888d3b53ac91160083b5c6cd5ca5c8
Author: Marek Polacek <polacek@redhat.com>
Date:   Wed Sep 29 11:45:24 2021 -0400

    c-family: Implement -Warray-compare [PR97573]

    This patch addresses one of my leftovers from GCC 11.  C++20 introduced
    [depr.array.comp]: "Equality and relational comparisons between two
operands
    of array type are deprecated." so this patch adds -Warray-compare.  Sin=
ce
the
    code in question is dubious (the comparison doesn't actually compare the
array
    elements), I've added this warning for C too, and enabled it in all C++
modes.

            PR c++/97573

    gcc/c-family/ChangeLog:

            * c-common.h (do_warn_array_compare): Declare.
            * c-warn.c (do_warn_array_compare): New.
            * c.opt (Warray-compare): New option.

    gcc/c/ChangeLog:

            * c-typeck.c (parser_build_binary_op): Call do_warn_array_compa=
re.

    gcc/cp/ChangeLog:

            * typeck.c (cp_build_binary_op): Call do_warn_array_compare.

    gcc/ChangeLog:

            * doc/invoke.texi: Document -Warray-compare.

    gcc/testsuite/ChangeLog:

            * c-c++-common/Warray-compare-1.c: New test.
            * c-c++-common/Warray-compare-2.c: New test.=