Syntax

#pragma defineonoption <macroname>
        <switches>

#pragma undefineonoption <macroname>
        <switches>

where <macroname> is a name to define or undefine, and <switches> are any command line switches. 

Description  

The pragma #pragma defineonoption defines a macro name when specified options are set. The macro name is defined if all the switches in are turned on, either from the command line or through a pragma.  

The pragma #pragma undefineonoption undefines a macro name when specified options are set. 

For instance, the following pragma

#pragma defineonoption DEBUG -v

results in the macro DEBUG being defined when the option -v is set.  

In contrast, this pragma

#pragma undefineonoption DEBUG -v

results in the macro DEBUG being undefined when the option -v is set.