[Bug c/48091] No warning when given function arguments mismatch earlier function definition which GCC assumes to be K&R, even with --std=c99 -pedantic

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48091

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Even if it's not invalid we should warn when we know the function has no
parameters and it's called with arguments.