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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100485] False positive in -Wmismatched-new-delete
Date: Mon, 10 May 2021 06:53:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100485

--- Comment #5 from fiesh at zefix dot tv ---

> extern "C" void free (void *);
>=20=20=20
> class Base
> {
> public:
>         Base();
>=20
>         void * operator new(unsigned long, const int &);
>         void operator delete(void * ptr, const int &) {
>           #pragma GCC diagnostic ignored "-Wmismatched-new-delete"
>           free (ptr);
>         }
> };
>=20
> void f()
> {
>         new (0) Base;
> }

Alas, keeping the diagnostic ignore local by means of `diagnostic push` /
`diagnostic pop` makes it not work correctly, presumably since the warning =
is
generated at the call site.  Making it global to everything including the
header file seems like a bad idea to me.=