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Details

Type: Bug
Resolution: Done
Priority: P3: Somewhat important
Fix Version/s: 6.2.0 Alpha, 6.3.0 Alpha
Affects Version/s: 6.0.3
Component/s: Build System: CMake
Labels:
None

Commits:
561fc8107f38b93808343e35c62d7d06704f8eb6 (qt/qtbase/dev) a4e53acc0c7a0a54302cd0ba42a188caf4640d9a (qt/qtbase/6.2)

Description

i'm having troubles with setting up a scalable setup:

i define a library in subdir/CMakeLists.txt:

add_library(lib lib.cpp)

find_package(Qt6 COMPONENTS Core Gui Widgets Qml Quick REQUIRED)
target_link_libraries(lib Qt6::Gui Qt6::QCocoaIntegrationPlugin)

this library links to qt6 libraries.

my executable in the root `CMakeLists.txt` consumes the library:

project(foo)
cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
add_subdirectory(subdir)
add_executable(exe main.cpp)
target_link_libraries(exe lib)

this gives me the following cmake configuration error:

CMake Error at CMakeLists.txt:8 (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_OBJECTS:Qt6::Gui_resources_1>

  Objects of target "Qt6::Gui_resources_1" referenced but no such target
  exists.


CMake Error at CMakeLists.txt:8 (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_OBJECTS:Qt6::QCocoaIntegrationPlugin_resources_1>

  Objects of target "Qt6::QCocoaIntegrationPlugin_resources_1" referenced but
  no such target exists.


CMake Error at CMakeLists.txt:8 (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_OBJECTS:Qt6::Gui_resources_1>

  Objects of target "Qt6::Gui_resources_1" referenced but no such target
  exists.


CMake Error at CMakeLists.txt:8 (target_link_libraries):
  Error evaluating generator expression:

    $<TARGET_OBJECTS:Qt6::QCocoaIntegrationPlugin_resources_1>

  Objects of target "Qt6::QCocoaIntegrationPlugin_resources_1" referenced but
  no such target exists.


-- Generating done

afaict the qt/cmake targets are IMPORTED targets, which are not GLOBAL. therefore the generator expression expands in a context where this target does not exist anymore. things work again once i move the `find_package` expression to the root CMakeLists.txt. unfortunately this is not a solution that i can easily apply to my whole codebase, which is rather modular and as many different consuming endpoints