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From: "kip at thevertigo dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/107140] New: Potential false positive uninitialized variable warning with -Wmaybe-uninitialized Date: Tue, 04 Oct 2022 00:38:18 +0000 [thread overview] Message-ID: <bug-107140-4@http.gcc.gnu.org/bugzilla/> (raw) 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.
next reply other threads:[~2022-10-04 0:38 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-04 0:38 kip at thevertigo dot com [this message] 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
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