comparisons..

[Martin v. Loewis]

> I always wondered whether it would be possible to drop the warning in
> case the signed constant has the same value when interpreted as an
> unsigned value.  Obviously, it is useful to compare an unsigned variable
> against a _positive_ constant, even if it - strictly according to the
> rules - should be interpreted as a signed quantity.  Or is this a
> promotion-hair issue ?

The warning is not justified in this case. The integer constant is
converted into an unsigned integer, and standard C guarantees that
there will be no change in value due to this conversion. So writing

  x > 5

is guaranteed to be the same thing as

  x > 5U

Regards,
Martin