Вышла версия cmake 3.9.2. А в Changelog'е написано про сабжевый баг:
Скачать, если кому надо, можно здесь: http://www.cmake.org/files/v3.9/cmake-3.9.2.tar.gz
* On macOS, the default application bundle ``Info.plist`` file no longer enables Hi-DPI support as it did in 3.9.0 and 3.9.1. The change had to be reverted because it broke iOS applications. * The Xcode generator no longer adds "outputPaths" to custom script build phases as it did in 3.9.0 and 3.9.1. This was added in an attempt to support Xcode 9's new build system, but broke incremental rebuilds for both the old and new Xcode build systems.