Unity3D平台依赖编译(unity3d 依赖注入)

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Unity includes a feature named “Platform Dependent Compilation”. This consists of some preprocessor directives that let you partition your scripts to compile and execute a section of code exclusively for one of the supported platforms.

Furthermore, you can run this code within the Editor, so you can compile the code specifically for your mobile/console and test it in the Editor!

The platform defines that Unity supports for your scripts are:

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

Note: For versions before 2.6.0 there are no platform defines as this feature was first introduced in that version.

We are going to show a small example of how to use the precompiled code. This will simply print a message that depends on the platform you have selected to build your target.

First of all, select the platform you want to test your code against by clicking on File -> Build Settings. This will bring the build settings window to select your target platform.

Select the platform you want to test your precompiled code against and press the Switch Editor button to tell Unity which platform you are targeting.

Create a script and copy/paste this code:-

Then, depending on which platform you selected, one of the messages will get printed on the Unity console when you press play.

Note that in C# you can use a CONDITIONAL attribute which is a more clean, less error-prone way of stripping out functions, see addition to the basic #if compiler directive, you can also use a multiway test in C# and JavaScript:-

However, Boo currently supports only the ifdef directive.

It is also possible to add to the built-in selection of defines by supplying your own. In the Other Settings panel of the Player Settings, you will see the Scripting Define Symbols textbox.

Here, you can enter the names of the symbols you want to define for that particular platform, separated by semicolons. These symbols can then be used as the conditions for #if directives just like the built-in ones.

You can define your own preprocessor directives to control which code gets included when compiling. To do this you must add a text file with the extra directives to the “Assets/” folder. The name of the file depends on the language you are using, and the extension is .rsp:

As an example, if you include the single line “-define:UNITY_DEBUG” in your smcs.rsp file the define UNITY_DEBUGwill exist as a global define for C# scripts, except for Editor scripts.

Every time you make changes to .rsp files you will need to recompile for them to be effective. You can do this by updating or reimporting a single script (.js, .cs or .boo) file.

If you want to modify only global defines, you should use Scripting Define Symbols in Player Settings, because this will cover all the compilers. If you choose the .rsp files instead, you’ll have to provide one file for every compiler Unity uses, and you won’t know when one or another compiler is used.

The use of the .rsp files is described in the help section of the smcs application which is included in the Editor installation folder. You can get more information by running “smcs -help”. Also, bear in mind the .rsp file needs to match the compiler being invoked. For example, when targeting the web player, smcs is used with smcs.rsp; when targeting standalone players, gmcs is used with gmcs.rsp; when targeting MS compiler, csc is used with csc.rsp; and so on.

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