warning on truncation

["alefor"]

Hi,

How to get a warning on

    bool b = 0.2 ;

with gcc ?
gcc (GCC) 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)
I've try with -Wall and -Wextra.

Visual C++ message:
warning C4305: 'initializing' : truncation from 'double' to 'bool'

Thanks