The {$IFOPT switch} will compile the text that follows it if the switch switch is currently in the specified state. If it isn’t in the specified state, then compilation continues after the corresponding {$ELSE} or {$ENDIF} directive.
As an example:
{$IFOPT M+}
Writeln ('Compiled with type information');
{$ENDIF}
Will compile the Writeln statement only if generation of type information is on.
RemarkThe {$IFOPT} directive accepts only short options, i.e. {$IFOPT TYPEINFO} will not be accepted.