On Mon, Jun 12, 2006 at 02:21:21PM +0200, Richard Guenther wrote:
> On 6/12/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> >On Mon, Jun 12, 2006 at 01:01:47PM +0100, Andrew Haley wrote:
> >>
> >> I'm starting to be a little suspicious about host2little(). I wonder
> >> if that's well-defined.
> >>
> >> I'm just guessing here becasue I can't see the code. Is it possible
> >
> > template<typename T> T swap_endian(T x)
> > {
> > char* a = reinterpret_cast<char*>(&x);
> > char* b = a + sizeof(T) - 1;
> > while (a<b) {
> > char tmp = *a;
> > *a++ = *b;
> > *b-- = tmp;
> > }
> > return x;
> > }
> >
> > template<typename T> T host2little(T x)
> > {
> > unsigned u = 1; return (*reinterpret_cast<char*>(&u) ? x :
> > swap_endian(x));
> > }
>
> You are violating aliasing rules. Try -fno-strict-aliasing, which
> should make the code
> work, or fix it.
Hmmm - don't grok; I'll do some googling. Compiling now with
-fno-strict-aliasing, but the manual says -O2 includes
-strict-aliasing, so what gives?
Andrew
