How to determine C code is compiled for Android/NDK or iOS

I am reusing a legacy C library in an iOS app and in an Android app. I want to customize some macro definitions (e.g. for logging). Are there standard defines to check for (using #ifdef) whether the code is being compiled fo开发者_如何学Cr iOS or Android/NDK?

__ANDROID__ or ANDROID for Android (compilation with the NDK) and __APPLE__ on Apple platforms (iOS or OSX)

you should consider creating two separate projects for those platforms with separate output/bin directories but shared source code. Then you just set some define in project properties for android and ios so you can recognize it when compiling