Calling functions through a pointer of incorrect type

[Florian Weimer]

Just a sanity check: It is no longer acceptable glibc coding style to
call functions through mismatching pointer types.  Correct?

Typical mismatches are: The function has an argument of type struct foo
**, but the function pointer has type void ** for the same argument.  Or
the function pointer has additional trailing arguments not declared by
the function.

These calls result in undefined behavior in standard C, and I don't
think it's a support GCC extension.

Florian