Testing CMake 2.8.12 features together with Qt5
The project contains two libraries "a" and "b". "a" links to Qt5::Core and uses Qt5 headers in its public API. "b" links to "a" using target_link_libraries and includes a header from "a" which itself includes a Qt header.
Without adding a find_package(Qt5Core) call in the scope of library "b", the include directories of the link interface of "a" are not properly set on target "b".
This means that "b" needs knowledge of "a"s dependencies.