가끔 특정 플랫폼에 의존하는 api를 사용하고 싶을 수가 있습니다. 아니면 특정 상황에 국한된 최적화를 가하고 싶을 수도 있습니다. 그런 경우에는 조건부 컴파일 매크로 (일명 전처리 매크로)를 사용하면 됩니다.

Note that #define doesn't exist; for that, learn about Haxe Macros.

Here's an example of multiplaform code:

    #if flash8
    // Haxe code specific for flash player 8
    #elseif flash
    // Haxe code specific for flash platform (any version)
    #elseif js
    // Haxe code specific for javascript plaform
    #elseif neko
    // Haxe code specific for neko plaform
    #else 
    // do something else
        #error  // will display an error "Not implemented on this platform"
        #error "Custom error message" // will display an error "Custom error message"
    #end

There is also a not prefix, which is the exclamation mark. So for a block that is compiled for every plaform except for PHP, you can do:

    #if !php
    // This code is not for PHP!
    #end

In addition to the various platform defines, you can also detect if this is a debug-enabled build (set using -debug):

    #if debug
    trace("Debug infos for all debug compiles");
    #end

You can define your own variables by using the Haxe compiler commandline options (for example using -D mydebug):

    #if mydebug
    trace("Some personalized debug infos");
    #end

Logical and/or operators are also supported:

    #if (neko && mydebug)
    // Only for "mydebug" mode on Neko
    #end

    #if (flash || php)
    // Code that works for either flash or PHP
    #end

You can compile code based on an haxe compiler version :

#if haxe_210
    trace(" haxe version >= 2.10");
#else
    trace(" haxe version < 2.10");
#end

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