[Bug c++/21667] New: misleading warning about array subscription

[gdr at gcc dot gnu dot org]

GCC (g++) emits a warning (-Wall) for the following code

% cat ary.C && g++ -Wall ary.C                            
int main()
{
   int ary[256] = { 0 };
   return ary['a'];
}
ary.C: In function 'int main()':
ary.C:4: warning: array subscript has type 'char'

The diagnostic is not helpful because the index is positive 
(all character constants from the basic character set have 
nonnegative values).  
The warning should be emitted only if the index is unkonwn (at
compile time) and has type 'char'.

-- Gaby

-- 
           Summary: misleading warning about array subscription
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gdr at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: plateform independent


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21667