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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103092] Non-throwing function pointer can point to a
 throwing-function in C++14
Date: Fri, 05 Nov 2021 09:26:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103092

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
G++ does not give an error for the example in p5:

class A { /* ... */ };
void (*pf1)(); // no exception specification
void (*pf2)() throw(A);

void f() {
  pf1 =3D pf2; // OK: pf1 is less restrictive
  pf2 =3D pf1; // error: pf2 is more restrictive
}

That should be ill-formed in C++98/11/14.

The equivalent with a noexcept-specifier would be:

class A { /* ... */ };
void (*pf1)(); // no exception specification
void (*pf2)() noexcept;

void f() {
  pf1 =3D pf2; // OK: pf1 is less restrictive
  pf2 =3D pf1; // error: pf2 is more restrictive
}

G++ doesn't reject this in 98/11/14, only C++17 and up.=