Re: [avr-gcc-list] Casting

[Russell Shaw]

Ron wrote:
> I am using a <long> as a parameter in which I pass various entities,
> sort of like a mailbox. Mostly they are longs, sometimes integers, and
> sometimes I need to pass a pointer. In the latter case a cast to long
> does not wholly satisfy the compiler (3.4.5), due to the size difference
> on AVRs, thus giving the warning:
>
> "cast from pointer to integer of different size"
>
> It is only a warning and the program works fine. However I would like to
> see a clean compile and so have been trying to find a combination of
> casts that would promote a pointer to a long, but to no avail. Does
> anyone have a suggestion?

How about:

  myfunc(long int param);

  void *ptr;

  myfunc((unsigned long int)((unsigned int)ptr))