The compiler normally warns of potential portability problems
and other hazards.
When porting legacy code (for example, in old-style C) to the ARM Compiler, many warnings
might be reported. It might be tempting to disable all such warnings with
–W. ARM recommends however that for portability reasons, you change the
code to make it ANSI compatible rather than suppressing the warnings.
Some warnings are suppressed by default. To override this,
--strict_warnings switch to enable all
By default, optimization messages, for example most of the messages between 1593 and 2159,
are not warnings. To treat optimization messages as warnings, use the