CMake: link to a library related to Qt5

I have a library that uses Qt5. I create it using this CMakeLists.txt file:

cmake_minimum_required (VERSION 3.0)

project (testLib LANGUAGES CXX) 

set(CMAKE_AUTOMOC ON)  
set(CMAKE_AUTOUIC ON)     
set(CMAKE_INCLUDE_CURRENT_DIR ON) 

find_package(Qt5 REQUIRED Widgets)  

add_library(testLib SHARED
    src/TestClass.cpp
    src/TestClass.h
)

target_include_directories(testLib PUBLIC 
    ${CMAKE_CURRENT_SOURCE_DIR}/src
)    

target_link_libraries(testLib PUBLIC Qt5::Widgets)

export(TARGETS testLib FILE testLib-exports.cmake)

      

        
        
        
      

    

Now I am trying to link the executable with this library in the build path. This is what I have tried so far:

cmake_minimum_required (VERSION 3.0)

project(TestProject)

add_executable(myexec src/main.cpp )
include(/path/to/testLib-exports.cmake)

target_link_libraries(myexec testLib)

      

        
        
        
      

    

I am getting this error:

Target "myexec" links to target "Qt5 :: Widgets", but the target was not found. Perhaps the find_package () call of the target is missing for IMPORTED, or the ALIAS target is missing?

I don't want to explicitly use find_package()

cmake in myexec file, but I want it to be transitive. How am I supposed to reference testLib? If the answer is not in the build path, that's ok.

EDIT: I changed the export line to:

export(TARGETS testLib FILE testLib-exports.cmake EXPORT_LINK_INTERFACE_LIBRARIES)

      

        
        
        
      

    

This is similar to what I need, but the generated files with and without EXPORT_LINK_INTERFACE_LIBRARIES are identical. Both if they say

This file is independent of other imported targets that have been exported from the same project, but in a separate export set.

As I understand it, it should be using the target property of LINK_INTERFACE_LIBRARIES

target_ListLib, but I noticed that it is NOTFOUND

. maybe this is the problem? However INTERFACE_LINK_LIBRARIES

has Qt5 :: Widgets.