-Wstrict-prototypes -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations

[John Fisher]

Is it necessary to specify all 4 of these warnings to get the maximum amount
of warnings in C code?

I would expect that -Wmissing-prototypes implies -Wmissing-declarations
since I understand
prototype to mean exactly "new-style function declaration".
However I note that
http://gcc.gnu.org/ml/gcc/2006-10/msg00609.html
does not state that any of these 4 options imply another.

What I'm trying to achieve is no old-style function declarations or
definitions, all global function definitions must have a pre-existing
new-style function declaration.