Since Android Studio 2.1 Beta 3, there is another bug which basically breaks the clang toolchain on OS X. I submitted the bug here: https://code.google.com/p/android/issues/detail?id=207585 but could not find any workaround. It is therefore recommended that everyone compiling JUCE apps with Android Studio uses the gcc toolchain instead (it’s a build setting in the Projucer). I changed the Projucer so that gcc is now the default option.