I wonder how to set a conditional define for a project. All I want is to have 'FOO' defined so that I could use {$ifdef FOO}. I've read http://wiki.lazarus.freepascal.org/Macros_and_Conditionals but seems this is not what I need. Anyway I tried setting "foo=bar" in the build modes and creating build macro with "foo:=bar" - both in vain. ShowMessage({$I %foo%}) won't work and {$if foo=bar} too.

Fr0sT wrote

I wonder how to set a conditional define for a project. All I want is to have 'FOO' defined so that I could use {$ifdef FOO}.

There are a few methods to do this:

1. Use a common include file in ALL your units. Changing the include file applies
immediately to all units.

2. Add the '-dXXXXX' define in "Project > Options > Compiler Options > Other"

3. Add it to your fpc.cfg file.

In other words, I mean setting FPC's "-d" option via GUI

Graeme Geldenhuys wrote

2. Add the '-dXXXXX' define in "Project > Options > Compiler Options > Other"

Ahh, it's something like I need although I thought there would be separate "project defines" list. Thanks anyway!