https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54979
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Mon Jul 27 12:40:45 2015 New Revision: 226242 URL: https://gcc.gnu.org/viewcvs?rev=226242&root=gcc&view=rev Log: PR c++/66555 PR c/54979 * c-common.c (find_array_ref_with_const_idx_r): New function. (warn_tautological_cmp): New function. * c-common.h (warn_tautological_cmp): Declare. * c.opt (Wtautological-compare): New option. * c-typeck.c (parser_build_binary_op): Call warn_tautological_cmp. * call.c (build_new_op_1): Call warn_tautological_cmp. * pt.c (tsubst_copy_and_build): Use sentinel to suppress tautological compare warnings. * doc/invoke.texi: Document -Wtautological-compare. * c-c++-common/Wtautological-compare-1.c: New test. Added: trunk/gcc/testsuite/c-c++-common/Wtautological-compare-1.c Modified: trunk/gcc/ChangeLog trunk/gcc/c-family/ChangeLog trunk/gcc/c-family/c-common.c trunk/gcc/c-family/c-common.h trunk/gcc/c-family/c.opt trunk/gcc/c/ChangeLog trunk/gcc/c/c-typeck.c trunk/gcc/cp/ChangeLog trunk/gcc/cp/call.c trunk/gcc/cp/pt.c trunk/gcc/doc/invoke.texi trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/g++.dg/cpp0x/decltype-54581.C trunk/gcc/testsuite/g++.dg/other/vector-compare.C
