X1030 Invalid compiler directive - '%s' (Delphi)

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This error message means there is an error in a compiler directive or in a command line option. Here are some possible error situations:

• An external declaration was syntactically incorrect.
• A command line option or an option in a DCC32.CFG file was not recognized by the compiler or was invalid. For example, '-$M100' is invalid because the minimum stack size must be at least 1024.
• The compiler found a $XXXXX directive, but could not recognize it. It was probably misspelled.
• The compiler found a $ELSE or $ENDIF directive, but no preceding $IFDEF, $IFNDEF or $IFOPT directive.
• (*$IFOPT*) was not followed by a switch option and a + or -.
• The long form of a switch directive was not followed by ON or OFF.
• A directive taking a numeric parameter was not followed by a valid number.
• The $DESCRIPTION directive was not followed by a string.
• The $APPTYPE directive was not followed by CONSOLE or GUI.
• The $ENUMSIZE directive (short form $Z) was not followed by 1,2 or 4.

(*$Description Copyright Embarcadero 2009*)    (*<-- Error here*)
program Produce;
(*$AppType Console*)                                     (*<-- Error here*)

begin
(*$If O+*)                                               (*<-- Error here*)
  Writeln('Optimizations are ON');
(*$Else*)                                                (*<-- Error here*)
  Writeln('Optimizations are OFF');
(*$Endif*)                                               (*<-- Error here*)
  Writeln('Hello world!');
end.

The example shows three typical error situations, and the last two errors are caused by the compiler not having recognized $If.

(*$Description 'Copyright Embarcadero 2009'*)  (*Need string*)
program Solve;
(*$AppType Console*)                                     (*AppType*)

begin
(*$IfOpt O+*)                                            (*IfOpt*)
  Writeln('Optimizations are ON');
(*$Else*)                                                (*Now fine*)
  Writeln('Optimizations are OFF');
(*$Endif*)                                               (*Now fine*)
  Writeln('Hello world!');
end.

So $Description needs a quoted string, we need to spell $AppType right, and checking options is done with $IfOpt. With these changes, the example compiles fine.