Re: patch: signed char issues

Philip Blundell (Philip.Blundell@pobox.com)
Mon, 24 Apr 2000 13:30:43 +0100

>Unfortunately, people forget about signed-ness issues. I actually wish
>that GCC would warn more about this type of unportable code. (eg,
>detecting an assignment or test between a bare "char" type and a
>negative number).

GCC already warns about comparison between an unsigned type and a negative
constant. It also has the capability to warn about any comparison between a
signed type and an unsigned one, though I don't think this is used by default
when building the kernel because it generates a lot of noise.

There doesn't seem to be any warning for assignment of a negative value to an
unsigned variable, though I don't imagine it would be hard to add.

p.

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