Re: [avr-gcc-list] Int32 Support

[Dave Hylands]

Hi again Nigel (this time removing my foot from my mouth),

> > You forget the standard 'c' gotcha:
> >
> > external void fn(uint32_t, uint32_t);
> > int main() {
> >    uint32_t a = 0x10000000<<15;    /* produces no warning */
> >    uint32_t b = 0;
> >    fn(a,b);                        //Use the variables
> >    return -1;
> >    }
> >
> > No warning is given but the variable a is set to zero.

I see now. the warning produced was for the second line. When I change
b to zero then I get no warnings (as you said).

The ANSI C Language says that the handling of overflow is not defined
as part of the language and that most implementation ignore it.

Seems like something that could be tested for.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/