Testing cmake config file for WebARKitLIb tests, it let you succesfully compile the tests with opencv-em

CMakeLists.txt

cmake_minimum_required(VERSION 3.24)
project(Webarkit_tests)

# GoogleTest requires at least C++14
set(CMAKE_CXX_STANDARD 14)

# Fetch googletest v1.13.0  commit b796f7d44681514f58a683a3a71ff17c94edb0c1
include(FetchContent)
FetchContent_Declare(
  googletest
  URL https://github.com/google/googletest/archive/b796f7d44681514f58a683a3a71ff17c94edb0c1.zip
)
# For Windows: Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(googletest)

enable_testing()

add_subdirectory(../WebARKit ../WebARKit/build)

add_executable(
  webarkit_test
  webarkit_test.cc
)

get_filename_component(PARENT_DIR ../ ABSOLUTE)
get_filename_component(TEST_DIR ./ ABSOLUTE)

target_include_directories(webarkit_test PRIVATE "${PARENT_DIR}/WebARKit/include")
target_include_directories(webarkit_test PRIVATE "${PARENT_DIR}/WebARKit/WebARKitTrackers/WebARKitOpticalTracking/include")
target_include_directories(webarkit_test PRIVATE
        "${TEST_DIR}/build_opencv"
        "${TEST_DIR}/build_opencv/libs/opencv/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/calib3d/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/core/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/features2d/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/flann/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/imgproc/include"
        "${TEST_DIR}/build_opencv/libs/opencv/modules/video/include"
        "${TEST_DIR}/build_opencv/libs/opencv_contrib/modules/xfeatures2d/include"
        )

set(webarkit_test 
${PARENT_DIR}/WebARKit/WebARKitManager.cpp
)

# The order of the libs make the difference!

target_link_libraries(
  webarkit_test
  WebARKitLib
  "${TEST_DIR}/build_opencv/lib/libopencv_calib3d.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_features2d.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_flann.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_video.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_xfeatures2d.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_imgproc.a"
  #"${TEST_DIR}/build_opencv/lib/libopencv_video.a"
  #"${TEST_DIR}/build_opencv/3rdparty/lib/libzlib.a"
  "${TEST_DIR}/build_opencv/lib/libopencv_core.a"
  "${TEST_DIR}/build_opencv/3rdparty/lib/libzlib.a"
  #"${TEST_DIR}/build_opencv/lib/libopencv_xfeatures2d.a"
  GTest::gtest_main
)

include(GoogleTest)
gtest_discover_tests(webarkit_test)

It's needed to replace the CMakeLists.txt inside WebARKitLib/test see PR webarkit/WebARKitLib#19