http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51625
--- Comment #3 from Peter Fraenkel <pnf at podsnap dot com> 2011-12-30 17:14:38 UTC --- Passing a double to a function expecting an int is very likely a bug and definitely bad style. The fact that cmath contains overloaded math functions with the same names as int math function in stdlib.h makes inadvertent misuse a real danger. Ideally, this particular conversion would cause a separate warning, but absent that feature it is safer to warn on any conversion.
