linking/compiling failed with +O4 option

[Kannan M Jeganathan]

> > (3) building with "+O4 -g..." will be passed.
> > The "-g" option does something magical.
> Probably drops the opt level. This will happen with aC++.
Right. You should be getting a warning stating the same:
$cc +O4 -g ....
cc: warning 414: Optimization reduced to +O2 for compatibility with Debug.

[chenn_1]

Thanks all. I decide not using +O4 by now.