Colcon build failed if a package set the requirement of ament_index_cpp

[tomcattiger1230]

-- Found ament_index_cpp: 1.4.0 (/Users/xxx/Develop/ros2/ros2_humble/install/share/ament_index_cpp/cmake)
CMake Error at /Users/xxx/Develop/ros2/ros2_humble/install/share/ament_index_cpp/cmake/ament_cmake_export_targets-extras.cmake:18 (message):
Failed to find exported target names in
'/Users/xxx/Develop/ros2/ros2_humble/install/share/ament_index_cpp/cmake/export_ament_index_cppExport.cmake'
Call Stack (most recent call first):
/Users/xxx/Develop/ros2/ros2_humble/install/share/ament_index_cpp/cmake/ament_index_cppConfig.cmake:41 (include)
CMakeLists.txt:14 (find_package)

[ooeygui]

(Microsoft) I'm working on this. I'm staging a fix in https://github.com/ms-iot/ament_index/tree/humble, and will PR when I can verify it. This repros when compiling resource_retriever.

[tomcattiger1230]

@ooeygui Thanks for this information. Correct. I've got the first error with resource_retriever. I've tried to skip this package, then I've noticed that almost every package with ament_index_cpp got the same error.

[ooeygui]

@tomcattiger1230 Thanks for confirming. I'm root causing it.

[ooeygui]

The CMake which ships with Visual Studio is later. Cmake recently changed _expectedTarget to _cmake_expected_target.

In C:\opt\ros\humble\x64\share\ament_index_cpp\cmake\ament_cmake_export_targets-extras.cmake
There's a block of code which looks for foreach and _expectedTarget:

    # extract the target names associated with the export
    set(_regex "foreach\\(_expectedTarget (.+)\\)")

However, the cmake files themselves reference _cmake_expected_target:

foreach(_cmake_expected_target IN ITEMS ament_index_cpp::ament_index_cpp)
  list(APPEND _cmake_expected_targets "${_cmake_expected_target}")
  if(TARGET "${_cmake_expected_target}")
    list(APPEND _cmake_targets_defined "${_cmake_expected_target}")
  else()
    list(APPEND _cmake_targets_not_defined "${_cmake_expected_target}")
  endif()
endforeach()

And here's the change:
Kitware/CMake@59cc920

[tomcattiger1230]

is there any suggestion to correct this? Thanks.

[ooeygui]

There is a fix in progress - ament/ament_cmake#395

[clalancette]

Actually, I'm going to close this one anyway since this is a duplicate of ament/ament_cmake#396