GCC 4.4.4 C99 EXTREME WARNING MODE

I want to compile a C99 program in GCC 4.4.4 but I want to do it in EXTREME WARNING MODE.

How do I do that?

>>12
>In March 2000, ANSI adopted the ISO/IEC 9899:1999 standard. This standard is commonly referred to as C99, and it is the current standard for C programming language.

IIRC the reason gcc defaults to C89 for -ansi is because they don't support all of C99, but I'm too lazy to confirm that.