[Bug c/94247] Wrong char-subscripts warning for limited-range index

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94247

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |diagnostic

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The warning is not context sensitive.  What I mean is it does not take into
account the range of k.

Also you can avoid the warning by using either unsigned char or signed char.

char is a special type.  Unlike other plain types, it can default either to
signed or unsigned and for GCC it depends on the ABI.

>and the compiler already knows this
Not when the warning is generated from the front-end.  It does not know the
range of the char variable there.