https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90691
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:aaa26bf496a646778ac861aed124d960b5bf549f commit r10-6527-gaaa26bf496a646778ac861aed124d960b5bf549f Author: Jason Merrill <ja...@redhat.com> Date: Sun Jan 26 22:58:32 2020 -0500 c++: Use constexpr to avoid wrong -Wsign-compare (PR90691). We would like to do constexpr evaluation to avoid false positives on warnings, but constexpr evaluation can involve function body copying that changes DECL_UID, which breaks -fcompare-debug. So let's remember that we need to avoid that. PR c++/90691 * expr.c (fold_for_warn): Call maybe_constant_value. * constexpr.c (struct constexpr_ctx): Add uid_sensitive field. (maybe_constant_value): Add uid_sensitive parm. (get_fundef_copy): Don't copy if it's true. (cxx_eval_call_expression): Don't instantiate if it's true. (cxx_eval_outermost_constant_expr): Likewise.
