https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86586
--- Comment #8 from Jason Merrill <jason at gcc dot gnu.org> --- Author: jason Date: Wed Apr 3 20:12:00 2019 New Revision: 270136 URL: https://gcc.gnu.org/viewcvs?rev=270136&root=gcc&view=rev Log: PR c++/86586 - -fcompare-debug=-Wsign-compare. This patch limits constexpr folding for -Wsign-compare to only cases that we would warn for without considering constant values, avoiding the folding in the testcase in question. gcc/c-family/ * c-warn.c (warn_for_sign_compare): Call fold_for_warn. gcc/cp/ * typeck.c (cp_build_binary_op): Don't fold for -Wsign-compare. Modified: trunk/gcc/c-family/ChangeLog trunk/gcc/c-family/c-warn.c trunk/gcc/cp/ChangeLog trunk/gcc/cp/typeck.c trunk/gcc/testsuite/g++.target/i386/mv1.C
