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From: "sss@li-snyder.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/112766] New: [14 regression] spurious -Wmaybe-uninitialized with array new Date: Wed, 29 Nov 2023 16:54:48 +0000 [thread overview] Message-ID: <bug-112766-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112766 Bug ID: 112766 Summary: [14 regression] spurious -Wmaybe-uninitialized with array new Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: sss@li-snyder.org Target Milestone: --- hi - With a recent checkout of gcc14 (20231129), on a x86_64-pc-linux-gnu host, the following source gives a bogus -Wmaybe-uninitialized warning with -Wall: -------------------------------------------------------------- void* operator new[](unsigned long, void* __p) ; class Result { public: Result(); ~Result(); }; void *foo(long nElements, void *p) { return p ? new((int*)p) Result[nElements] : new Result[nElements]; } -------------------------------------------------------------- $ g++ -c -O1 -Wall x.cc x.cc: In function ‘void* foo(long int, void*)’: x.cc:11:67: warning: ‘nElements.6’ may be used uninitialized [-Wmaybe-uninitialized] 11 | return p ? new((int*)p) Result[nElements] : new Result[nElements]; | ^ x.cc:11:58: note: ‘nElements.6’ was declared here 11 | return p ? new((int*)p) Result[nElements] : new Result[nElements]; | ^~~~~~~~~ We get the same warning with -O2 and -O3, but not -O0. This warning does not occur with gcc 13.2.1 20230728.
next reply other threads:[~2023-11-29 16:54 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-29 16:54 sss@li-snyder.org [this message] 2023-11-29 17:04 ` [Bug tree-optimization/112766] " mpolacek at gcc dot gnu.org 2023-11-30 9:01 ` [Bug tree-optimization/112766] [14 regression] spurious -Wmaybe-uninitialized with array new since r14-4089 rguenth at gcc dot gnu.org 2023-11-30 9:50 ` rguenth at gcc dot gnu.org 2023-11-30 12:35 ` cvs-commit at gcc dot gnu.org 2023-11-30 12:35 ` rguenth at gcc dot gnu.org
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