not get the warning about the sign change on the return values with using -Wall -Wextra only.

Well, its perfectly legal C to assign int to uint, and there are old time system interfaces that use int where they only return positive values and actually should have used uint, so the warning is spurious (and unfixable) in some cases. Thats why it is not included in -Wall and -Wextra.

The less used warnings tend to be ones that can cause more unsuppressable spurious results, or just plain stupid results (see a recent discussion between @b4n and I about returning small structs from functions that was triggered by one of his warnings 😉 ). Thats why @b4n doesn't advise his option set and use it on Travis, the results cannot be taken at face value, they need interpretation.

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