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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/70248] constexpr initialization with unspecified equality expression accepted Date: Thu, 15 Oct 2020 11:24:56 +0000 [thread overview] Message-ID: <bug-70248-4-5NWGx5dHMm@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-70248-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70248 --- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> --- In gcc/cp/typeck.c:cp_build_binary_op this warning should be an error during constant evaluation for EQ_EXPR and NE_EXPR: if (complain & tf_warning) { tree stripped_orig_op0 = tree_strip_any_location_wrapper (orig_op0); tree stripped_orig_op1 = tree_strip_any_location_wrapper (orig_op1); if ((TREE_CODE (stripped_orig_op0) == STRING_CST && !integer_zerop (cp_fully_fold (op1))) || (TREE_CODE (stripped_orig_op1) == STRING_CST && !integer_zerop (cp_fully_fold (op0)))) warning_at (location, OPT_Waddress, "comparison with string literal results in " "unspecified behavior"); } And this one for rel ops and spaceships: if (TREE_CODE (orig_op0) == STRING_CST || TREE_CODE (orig_op1) == STRING_CST) { if (complain & tf_warning) warning_at (location, OPT_Waddress, "comparison with string literal results " "in unspecified behavior"); } That only handles the string literals cases though, we also need to reject pointers to distinct objects at the same places.
next prev parent reply other threads:[~2020-10-15 11:24 UTC|newest] Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-70248-4@http.gcc.gnu.org/bugzilla/> 2020-10-15 11:19 ` redi at gcc dot gnu.org 2020-10-15 11:24 ` redi at gcc dot gnu.org [this message] 2020-10-15 15:03 ` mpolacek at gcc dot gnu.org 2023-08-22 18:35 ` pkeir at outlook dot com 2024-01-03 13:00 ` redi at gcc dot gnu.org 2024-01-03 13:01 ` redi at gcc dot gnu.org 2024-01-03 13:07 ` redi at gcc dot gnu.org
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