UNDEF directive (Delphi)

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Conditional compilation


{$UNDEF name}


Undefines a previously defined conditional symbol. The symbol is forgotten for the remainder of the compilation of the current source file or until it reappears in a $DEFINE directive. The $UNDEF directive has no effect if name is already undefined.

Conditional symbols defined with a command-line switch or through the Project|Options dialog are reinstated at the start of compilation of each unit source file. Conditional symbols defined in a unit source file are forgotten when the compiler starts on another unit.