"John Fisher" <john.fisher@xxxxxxxxxx> writes:
> Is it necessary to specify all 4 of these warnings to get the maximum amount
> of warnings in C code?
Probably not.
> I would expect that -Wmissing-prototypes implies -Wmissing-declarations
> since I understand
> prototype to mean exactly "new-style function declaration".
-Wmissing-prototypes warns about
void f ();
void f (int i) { }
(i.e., there is no previous declaration with a prototype).
-Wmissing-declarations normally warns about
void f (int i) { }
(i.e., there is no previous declaration at all) which is a subset of
-Wmissing-prototypes.
I can't think of any case where -Wmissing-declarations will give a
warning but -Wmissing-prototypes will not. There is what appears to
be such a case in the compiler source code, but I don't see any way to
trigger it with a valid program.
Ian
