Unity3D 系统宏

Platform Defines

The platform defines that Unity supports for your scripts are:

UNITY_EDITOR	Define for calling Unity Editor scripts from your game code.
UNITY_STANDALONE_OSX	Platform define for compiling/executing code specifically for Mac OS (This includes Universal, PPC and Intel architectures).
UNITY_DASHBOARD_WIDGET	Platform define when creating code for Mac OS dashboard widgets.
UNITY_STANDALONE_WIN	Use this when you want to compile/execute code for Windows stand alone applications.
UNITY_STANDALONE_LINUX	Use this when you want to compile/execute code for Linux stand alone applications.
UNITY_STANDALONE	Use this to compile/execute code for any standalone platform (Mac, Windows or Linux).
UNITY_WEBPLAYER	Platform define for web player content (this includes Windows and Mac Web player executables).
UNITY_WII	Platform define for compiling/executing code for the Wii console.
UNITY_IPHONE	Platform define for compiling/executing code for the iPhone platform.
UNITY_ANDROID	Platform define for the Android platform.
UNITY_PS3	Platform define for running PlayStation 3 code.
UNITY_XBOX360	Platform define for executing Xbox 360 code.
UNITY_NACL	Platform define when compiling code for Google native client (this will be set additionally to UNITY_WEBPLAYER).
UNITY_FLASH	Platform define when compiling code for Adobe Flash.
UNITY_BLACKBERRY	Platform define for a Blackberry10 device.
UNITY_WP8	Platform define for Windows Phone 8.
UNITY_METRO	Platform define for Windows Store Apps (additionally NETFX_CORE is defined when compiling C# files against .NET Core).
UNITY_WINRT	Equivalent to UNITY_WP8 | UNITY_METRO

Also you can compile code selectively depending on the version of the engine you are working on. Currently the supported ones are:

UNITY_2_6	Platform define for the major version of Unity 2.6.
UNITY_2_6_1	Platform define for specific version 1 from the major release 2.6.
UNITY_3_0	Platform define for the major version of Unity 3.0.
UNITY_3_0_0	Platform define for the specific version 0 of Unity 3.0.
UNITY_3_1	Platform define for major version of Unity 3.1.
UNITY_3_2	Platform define for major version of Unity 3.2.
UNITY_3_3	Platform define for major version of Unity 3.3.
UNITY_3_4	Platform define for major version of Unity 3.4.
UNITY_3_5	Platform define for major version of Unity 3.5.
UNITY_4_0	Platform define for major version of Unity 4.0.
UNITY_4_0_1	Platform define for major version of Unity 4.0.1.
UNITY_4_1	Platform define for major version of Unity 4.1.
UNITY_4_2	Platform define for major version of Unity 4.2.

最新Unity3D系统宏地址：http://docs.unity3d.com/Documentation/Manual/PlatformDependentCompilation.html