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

You can use:

{$Message HINT|WARN|ERROR|FATAL 'text string' } 

{$MESSAGE 'Boo!'}                   emits a hint 
{$Message Hint 'Feed the cats'}     emits a hint 
{$messaGe Warn 'Looks like rain.'}  emits a warning 
{$Message Error 'Not implemented'}  emits an error, continues compiling 
{$Message Fatal 'Bang.  Yer dead.'} emits an error, terminates compiler 

See: http://docs.embarcadero.com/products/rad_studio/delphiAndcpp2009/HelpUpdate2/EN/html/devcommon/compdirsmessagedirective_xml.html

This works in Delphi 6 and later.

Answer 2

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.