问题
In the quest to resolve the Objective-C namespace issue I'd like to experiment with prefixing a dependency's Objective-C classes based on the target being built.
As an example, suppose I have in my shared library (ObjCStaticLib) a class (CWindow). I have two plugins (A and B) that will use this CWindow. To avoid A's CWindow from colliding with B's CWindow, I want to prefix the CWindow class name at compile time, so A's CWindow becomes ACWindow and B's becomes BCWindow.
I'm looking for a way to communicate to ObjCStaticLib at compile time what prefix it should use to compile itself with. I'm thinking about using xcconfigs to specify a preprocessor macro that the leaf target customizes and that ObjCStaticLib uses. However, I'm not aware of a way for a target to "communicate" with a dependency like that.
I can modify all the sources/projects/etc involved as necessary to implement per-client namespace customization in a dependency.
Does anyone have a good solution for this?
来源：https://stackoverflow.com/questions/1479043/xcode-xcconfig-configuring-a-dependency-based-on-the-target