Over on gcc@gcc.gnu.org is a thread like about warning for mixed signed-ness chars. IIRC this is what the SuSE compiler was noisy about do you want me to comment on p5p's behalf? Joseph S. Myers <jsm@polyomino.org.uk> writes: >On Mon, 6 Oct 2003, Mike Stump wrote: > >> I propose to tighten this up to a warning, unconditionally. How to >> others feel? -Wall? -std=? Over my dead body? > >Make sure that this also warns for char/signed char/unsigned char >mismatches (even where the signedness is the same, they're still different >types) and that those are covered in the testcase.