Wrong warning for different signedness

[frankie]

Consider the following snippet:

Code Select Expand


unsigned short a = 1;
unsigned long  b = 2;

if (a <= b)
printf("a <= b\n");

Will give the warning:

Code Select Expand


C:\PELLESC\Bugs\Warning_bug.c(10): warning #2251: Operands of '<=' have types with different signedness: 'int' and 'unsigned long int'.


[Pelle]

As designed. I'm not going to waste time on a corner case like this.

[frankie]

As designed.

I understand that this is not a major issue in this phase.
But I can't understand why is by design  .
Both values are unsigned, why the signedness mismatch complain?