public inbox for gcc-bugs@sourceware.org help / color / mirror / Atom feed
* [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized
@ 2022-10-04 0:38 kip at thevertigo dot com
2022-10-06 10:05 ` [Bug c++/107140] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: kip at thevertigo dot com @ 2022-10-04 0:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107140
Bug ID: 107140
Summary: Potential false positive uninitialized variable
warning with -Wmaybe-uninitialized
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kip at thevertigo dot com
Target Milestone: ---
I am aware there have been other related issues that have already been opened.
I am not sure if this adds anything new to the discussion, but I have, with
some effort, managed to isolate a minimal that reproduces the issue.
This code is not meant to be run, but it's merely a heavily butchered minimal
to re-create a "'MaximumPriorityQueue' may be used uninitialized" warning. This
originates in Test.cpp on L71. Here is the code:
https://godbolt.org/z/a17Eoc3f3
This only appears to happen with >= -O2. My guess is this may be a result of a
complex interaction with the optimizer and how part of the instantiated
template was inlined.
I note that if I reorder m_LessThanComparison with m_MinMaxHeap in Test.cpp,
the warning is suppressed.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c++/107140] Potential false positive uninitialized variable warning with -Wmaybe-uninitialized 2022-10-04 0:38 [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized kip at thevertigo dot com @ 2022-10-06 10:05 ` rguenth at gcc dot gnu.org 2022-10-06 17:49 ` kip at thevertigo dot com 2022-10-06 17:50 ` kip at thevertigo dot com 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2022-10-06 10:05 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107140 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |24639 Last reconfirmed| |2022-10-06 Keywords| |diagnostic Status|UNCONFIRMED |WAITING Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Can you attach the testcase as a tarfile please? Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639 [Bug 24639] [meta-bug] bug to track all Wuninitialized issues ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/107140] Potential false positive uninitialized variable warning with -Wmaybe-uninitialized 2022-10-04 0:38 [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized kip at thevertigo dot com 2022-10-06 10:05 ` [Bug c++/107140] " rguenth at gcc dot gnu.org @ 2022-10-06 17:49 ` kip at thevertigo dot com 2022-10-06 17:50 ` kip at thevertigo dot com 2 siblings, 0 replies; 4+ messages in thread From: kip at thevertigo dot com @ 2022-10-06 17:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107140 --- Comment #2 from Kip Warner <kip at thevertigo dot com> --- Created attachment 53673 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53673&action=edit Minimal ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c++/107140] Potential false positive uninitialized variable warning with -Wmaybe-uninitialized 2022-10-04 0:38 [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized kip at thevertigo dot com 2022-10-06 10:05 ` [Bug c++/107140] " rguenth at gcc dot gnu.org 2022-10-06 17:49 ` kip at thevertigo dot com @ 2022-10-06 17:50 ` kip at thevertigo dot com 2 siblings, 0 replies; 4+ messages in thread From: kip at thevertigo dot com @ 2022-10-06 17:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107140 --- Comment #3 from Kip Warner <kip at thevertigo dot com> --- If you click the Save button in Godbolt's CE, you can download a compressed archive. I've attached it for you. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-10-06 17:50 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-10-04 0:38 [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized kip at thevertigo dot com 2022-10-06 10:05 ` [Bug c++/107140] " rguenth at gcc dot gnu.org 2022-10-06 17:49 ` kip at thevertigo dot com 2022-10-06 17:50 ` kip at thevertigo dot com
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).