C strange warning.

http://pastebin.com/3js28CTR
$> gcc main.c
If tata(char|short|float c) => warning
If tata(int|long|double c) => nothing

Does somebody could explain why exactly ? =)

Yep, but why this warning doesn't appear if tata(char c) is replaced by tata(int c) ?
The prototype of the function and the one of the pointer aren't the sames.