Falk Hueffner <hueffner@xxxxxxxxxxxxxxxxxxxxxxxxxxx> writes:
> Ken Foskey <foskey@xxxxxxxxxxxxxxxx> writes:
>
> > The following code gives me an uninitialised warning on nCol. There is
> > no possible default clause for this one.
> >
> > switch( nXIndex & 3 )
> > {
> > case 0 :
> > nCol = *pTmp >> 6;
> > break;
> > case 1 :
> > nCol = ( *pTmp >> 4 ) & 0x03 ;
> > break;
> >
> > case 2 :
> > nCol = ( *pTmp >> 2 ) & 0x03;
> > break;
> > case 3 :
> > nCol = ( *pTmp++ ) & 0x03;
> > break;
> > }
>
> There will always be cases where gcc guesses wrong on this; it is not
> only very hard, but provably impossible to get it always right.
However I get no such warnings for the same code, not with gcc 3.4,
3.3.3, or very old 2.95.3 .
