Preprocessor macro in parent project for use in subproject

问题:

I have an Xcode project, which has a subproject which is a static library. I've defined a preprocessor macro in the parent project (in Build Settings), and I want it to be recognized by the subproject at compile time (I have some #ifdef statements in the subproject). But the macro is always undefined in the subproject, no matter what I do. Is it possible to do what I want?

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