cmake_qt5_upstream

Test project to demonstrate transitive link problems for CMake project using Qt5

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• Project 1: mylib

  Tiny library using QtString from Qt5::Core that generates CMake package configuration files to be used with find_package() by upstream projects

• Project 2: myapp

  Tiny app that uses mylib as an IMPORTED target

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• Examplary build in build.sh taking two arguments:

  1. Path to Qt5 installation

  2. Installation prefix for mylib

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CMake configuration run of myapp complains like this:

CMake Error at CMakeLists.txt:11 (add_executable): Target "MyAPP" links to target "Qt5::Core" but the target was not found. Perhaps a find_package() call is missing for an IMPORTED target, or an ALIAS target is missing?

The reason is that in MyLIBTargets.cmake the INTERFACE_LINK_LIBRARY entry for Qt5 Core is the Qt5::Core symbol which cannot be resolved by default. Can somebody tell my what is the correct way to deal with this situation?