Can I generate a custom compiler error? If so, how?

Question

Here is what I want to do. I have a project that must be compiled in some version of Delphi or later. I would like to use a conditional compiler directive to test the Delphi ver

Answer 1

Checking the Delphi version has become easy since CONDITIONALEXPRESSIONS directive was introduced in Delphi 6:

program requires2010;

{$APPTYPE CONSOLE}

{$IFDEF CONDITIONALEXPRESSIONS}
   {$IF CompilerVersion >= 21.0} // 21.0 is Delphi 2010
     {$DEFINE DELPHI2010}
   {$IFEND}
{$ENDIF}

begin
{$IFNDEF DELPHI2010}
  {$MESSAGE Fatal 'Wrong Delphi Version'}
{$ENDIF}
  Writeln('Continued');
  Readln;
end.