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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/98465] Bogus warning stringop-overread wuth -std=gnu++20 -O2 and std::string::insert
Date: Wed, 13 Jan 2021 18:19:49 +0000 [thread overview]
Message-ID: <bug-98465-4-7Q4lPYAIGO@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-98465-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98465
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Target Milestone|--- |11.0
Priority|P3 |P2
Keywords| |alias
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
Bumping up Priority to 2 since this is causing Fedora build failures (with
-Werror) in a number of packages. I can't think of a better near term
fix/workaround (for GCC 11) than to revert the change enabling the
-Wstringop-xxx warnings for memcpy/memmove calls in system headers inlined into
user code. This won't eliminate the warning completely, just suppress it when
-Wno-system-headers is in effect (which is by default), and restore things to
their pre-GCC 11 status.
My idea for a longer term solution is to add some source-level annotation to
containers like std::string to either let GCC eliminate the unreachable code
altogether, or let the warning determine the code is, in fact, unreachable.
For reference, here's a brief exchange we had on this subject:
https://gcc.gnu.org/pipermail/gcc/2021-January/234641.html
next prev parent reply other threads:[~2021-01-13 18:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-28 18:36 [Bug middle-end/98465] New: " romain.geissler at amadeus dot com
2020-12-28 20:54 ` [Bug middle-end/98465] " msebor at gcc dot gnu.org
2020-12-30 12:49 ` romain.geissler at amadeus dot com
2020-12-30 13:22 ` romain.geissler at amadeus dot com
2020-12-30 21:25 ` msebor at gcc dot gnu.org
2021-01-06 22:38 ` msebor at gcc dot gnu.org
2021-01-06 22:59 ` msebor at gcc dot gnu.org
2021-01-06 23:14 ` msebor at gcc dot gnu.org
2021-01-07 20:26 ` msebor at gcc dot gnu.org
2021-01-13 18:19 ` msebor at gcc dot gnu.org [this message]
2021-01-13 18:41 ` law at redhat dot com
2021-01-13 18:52 ` jakub at gcc dot gnu.org
2021-01-13 19:02 ` msebor at gcc dot gnu.org
2021-01-13 19:14 ` jakub at gcc dot gnu.org
2021-01-13 19:30 ` msebor at gcc dot gnu.org
2021-01-14 2:21 ` msebor at gcc dot gnu.org
2021-01-19 19:00 ` msebor at gcc dot gnu.org
2021-01-20 23:20 ` [Bug middle-end/98465] [11 Regression] Bogus -Wstringop-overread with " msebor at gcc dot gnu.org
2021-02-04 14:03 ` jakub at gcc dot gnu.org
2021-02-04 14:39 ` redi at gcc dot gnu.org
2021-02-04 15:25 ` jakub at gcc dot gnu.org
2021-02-04 15:53 ` redi at gcc dot gnu.org
2021-02-04 15:54 ` redi at gcc dot gnu.org
2021-02-04 16:02 ` msebor at gcc dot gnu.org
2021-02-04 16:58 ` jakub at gcc dot gnu.org
2021-02-04 17:12 ` jakub at gcc dot gnu.org
2021-02-04 20:57 ` msebor at gcc dot gnu.org
2021-02-04 21:09 ` jakub at gcc dot gnu.org
2021-02-05 10:15 ` jakub at gcc dot gnu.org
2021-02-08 18:51 ` jakub at gcc dot gnu.org
2021-02-09 11:33 ` cvs-commit at gcc dot gnu.org
2021-02-09 11:35 ` [Bug middle-end/98465] " jakub at gcc dot gnu.org
2021-02-19 23:41 ` msebor at gcc dot gnu.org
2021-11-12 19:53 ` msebor at gcc dot gnu.org
2022-02-15 3:55 ` Randy at miningrigrentals dot com
2022-02-15 9:47 ` redi at gcc dot gnu.org
2022-02-15 9:55 ` Randy at miningrigrentals dot com
2022-02-15 10:02 ` redi at gcc dot gnu.org
2022-02-15 10:50 ` Randy at miningrigrentals dot com
2022-02-15 12:29 ` redi at gcc dot gnu.org
2022-02-15 12:40 ` Randy at miningrigrentals dot com
2022-02-15 12:52 ` redi at gcc dot gnu.org
2022-02-15 19:23 ` Randy at miningrigrentals dot com
2022-02-17 10:37 ` redi at gcc dot gnu.org
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