The #undef preprocessing
directive undefines symbols previously defined using the #define directive.
This directive has the same effect as the following preprocessing
switch:
/U<name>
To undefine a symbol with #undef:
Procedure
In the Add Preprocessing
Symbol window, select the Add Symbol and Undefined radio
buttons.
In the Symbol field,
type the name
of the symbol you want to undefine.
Depending on what you want to do:
Click Apply if
you want
to enter another symbol with #undef.
Click OK if you are done
and to return to the Preprocessing tab.