linking opencv libraries included as an external project via cmake [duplicate]

Answer 1

The best solution to use cmake with OpenCV project is:

1. Compile OpenCV as shared / static libraries with OpenCV's cmake build system.
2. In your project's CMakeLists.txt

For example (CMakeLists.txt):

cmake_minimum_required(VERSION 2.8.12)
project(test_project)

# OpenCV_DIR could also be read from system environment variable.
if(WIN32)
  set(OpenCV_DIR "d:/libs/opencv-2.4.8/build")
else()
  set(OpenCV_DIR "/usr/lib/opencv")
endif()
find_package(OpenCV REQUIRED COMPONENTS core imgproc highgui)

include_directories(${OpenCV_INCLUDE_DIRS}) # not needed for opencv>=4.0
add_executable(test main.cpp)
target_link_libraries(test ${OpenCV_LIBS})

It works in cross-platforms.