On 05/07/11 14:53, Georg-Johann Lay wrote:
> Andrew Haley wrote:
>> On 04/07/11 19:53, Georg-Johann Lay wrote:
>>> Paul Smith wrote:
>>>> On Mon, 2011-07-04 at 19:17 +0200, Georg-Johann Lay wrote:
>>>>>>> double copysign (double x, double y)
>>>>>>> {
>>>>>>> unsigned short * const px = (unsigned short*)(char*)&x + 3;
>>>>>>> unsigned short * const py = (unsigned short*)(char*)&y + 3;
>>>> I don't get why you have the (char*) cast here?
>>> It's not a source of mine. I don't know the reason why it's there.
>>
>> I suspect it shuts up a compiler warning. :-)
>
> No, gcc does not warn with -Wstrict-aliasing; not 4.5.2 and not 4.7
> trunk; not with and not without (char*).
That really is odd. This is exactly the kind of code we should warn about.
Andrew.
