https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97573
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:2dda00b734888d3b53ac91160083b5c6cd5ca5c8 commit r12-4148-g2dda00b734888d3b53ac91160083b5c6cd5ca5c8 Author: Marek Polacek <pola...@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. Since 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_compare. 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.
