I some of my units, I have :

uses classes,
{$IFDEF  USE_XYZ}
    certain_unitXYZ
{$ENDIF};
Where do I put
{$DEFINE USE_XYZ}

so that when I rebuild the project, fpc will see USE_XYZ is defined.

Putting in in the project .lpr does not work

Thanks in advance.

Dennis

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Add -dUse_XYZ to
Project / Project Options / Compiler Options / Custom Options

Mattias

Add -dUse_XYZ to Project / Project Options / Compiler Options / Custom Options

Curiosity : Why a "d" in the beginning?

Regards,
Ara

Dennis wrote

Where do I put {$DEFINE USE_XYZ} so that when I rebuild the project, fpc will see USE_XYZ is defined.

In Project Options:
Compiler Options -> Custom Options - > Defines ...

Juha

> Add -dUse_XYZ to Project / Project Options / Compiler Options / > Custom Options Curiosity : Why a "d" in the beginning?

"-d" is the fpc flag for a define. See "fpc -h".

Mattias

"-d" is the fpc flag for a define. See "fpc -h".

Thanks,
Ara

Dennis wrote

so that when I rebuild the project, fpc will see USE_XYZ is defined.

You have multiple options.

Depending on your Lazarus version... In older versions of Lazarus IDE you have to define then in "Project Options -> Compiler Options -> Other" and enter them in the "Custom options" memo box.

If you don't always compile you project with Lazarus IDE, or switch to other IDE's on occasion, you can also use include file in the header of each of your units in your project.

eg:

==================================
program mytestapp;
{$I mydefines.inc}

uses
....
==================================

==================================
unit mytestunit;
{$I mydefines.inc}
interface

uses
....
==================================

The mydefines.inc file will contain things like

  {$mode objfpc}
  {$define SomeDefine}
  {.$define release}  // this one is disabled for now
  {$define debug}
  etc.

Regards,
Graeme