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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100485] New: False positive in -Wmismatched-new-delete
Date: Sat, 08 May 2021 09:32:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100485

            Bug ID: 100485
           Summary: False positive in -Wmismatched-new-delete
           Product: gcc
           Version: 11.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fiesh at zefix dot tv
  Target Milestone: ---

The following code triggers -Wmismatched-new-delete:

----------------------------------------

extern "C" void free(void *);
class Base
{
public:
        Base();
        void * operator new(unsigned long, const int &);
        void operator delete(void * ptr, const int &) { free(ptr); }
};
void f()
{
        new (0) Base;
}

----------------------------------------

Supplying `__attribute__((malloc (free, 1)))` to `operator new` also doesn't
help.=