Awesome

Better-Defines

An easy and elegant way to manage your preprocessor directives in Unity3D

This asset helps to manage a list of cutom Unity Scripting Define Symbols. You can easily create configurations for different platforms and apply them. You can also add or remove defines globally for all platfroms.

Managing Defines

Global Platfrom Settings

Here you specify platforms that you use globally and ones you don't won't bother you in the config tab