-d macro value ignored in code

Original Reporter info from Mantis: p_daniel

• Reporter name:

Description:

Documentation say that {$DEFINE ident:=expr} and command-line -dident:=expr are equivalent, but if you use the second, value of 'ident' available only in compile time expressions and have no effect in code.
For example:

program test;

{$IF DEFINED(MY_VAR)}
  {$INFO MY_VAR defined}
  {$IF MY_VAR=123}
    {$INFO MY_VAR = 123}
  {$ELSE}
    {$INFO MY_VAR <> 123}
  {$ENDIF}
{$ENDIF}

begin
  writeln(MY_VAR);
end.

===

fpc test.pas -Sm -dMY_VAR:=123
...
Compiling test.pas
User defined: MY_VAR defined
User defined: MY_VAR = 123
test.pas(15,17) Error: Identifier not found "MY_VAR"
test.pas(17) Fatal: There were 1 errors compiling module, stopping
Fatal: Compilation aborted

But if you declare {$DEFINE MY_VAR:=123} in code, all is Ok.

Steps to reproduce:

fpc test.pas -Sm -dMY_VAR:=123

Mantis conversion info:

• Mantis ID: 27529
• OS: Linux
• Build: [2014/04/20] for x86_64
• Platform: x86-64
• Version: 2.6.4
• Fixed in version: 3.1.1
• Fixed in revision: 30271 (#3396e2e1)