public inbox for libstdc++-cvs@sourceware.org help / color / mirror / Atom feed
From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r12-9716] libstdc++: avoid bogus -Wrestrict [PR105651] Date: Wed, 21 Jun 2023 12:18:54 +0000 (GMT) [thread overview] Message-ID: <20230621121854.67BE83858D28@sourceware.org> (raw) https://gcc.gnu.org/g:636795a6dfc17ead7b22b9f76b0fc47bdb9d357d commit r12-9716-g636795a6dfc17ead7b22b9f76b0fc47bdb9d357d Author: Jason Merrill <jason@redhat.com> Date: Thu Aug 18 23:53:16 2022 -0400 libstdc++: avoid bogus -Wrestrict [PR105651] PR tree-optimization/105651 libstdc++-v3/ChangeLog: * include/bits/basic_string.tcc (_M_replace): Add an assert to avoid -Wrestrict false positive. Diff: --- libstdc++-v3/include/bits/basic_string.tcc | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libstdc++-v3/include/bits/basic_string.tcc b/libstdc++-v3/include/bits/basic_string.tcc index 0696b96604c..48fa28e6466 100644 --- a/libstdc++-v3/include/bits/basic_string.tcc +++ b/libstdc++-v3/include/bits/basic_string.tcc @@ -529,6 +529,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION { const size_type __nleft = (__p + __len1) - __s; this->_S_move(__p, __s, __nleft); + // Tell the middle-end that the copy can't overlap + // (PR105651). + if (__len2 < __nleft) + __builtin_unreachable(); this->_S_copy(__p + __nleft, __p + __len2, __len2 - __nleft); }
reply other threads:[~2023-06-21 12:18 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20230621121854.67BE83858D28@sourceware.org \ --to=redi@gcc.gnu.org \ --cc=gcc-cvs@gcc.gnu.org \ --cc=libstdc++-cvs@gcc.gnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).