opencv/samples/CMakeLists.txt

# Utility function: adds sample executable target with name "example_<group>_<file_name>"
# Usage:
#   ocv_define_sample(<output target> <relative filename> <group>)
function(ocv_define_sample out_target source sub)
  get_filename_component(name "${source}" NAME_WE)
  set(the_target "example_${sub}_${name}")
  add_executable(${the_target} "${source}")
  set_target_properties(${the_target} PROPERTIES PROJECT_LABEL "(sample) ${name}")
  if(ENABLE_SOLUTION_FOLDERS)
    set_target_properties(${the_target} PROPERTIES FOLDER "samples/${sub}")
  endif()
  if(WIN32 AND MSVC AND NOT BUILD_SHARED_LIBS)
    set_target_properties(${the_target} PROPERTIES LINK_FLAGS "/NODEFAULTLIB:atlthunk.lib /NODEFAULTLIB:atlsd.lib /DEBUG")
  endif()
  if(WIN32)
    install(TARGETS ${the_target} RUNTIME DESTINATION "samples/${sub}" COMPONENT samples)
  endif()
  # Add single target to build all samples in the group: 'make opencv_samples_cpp'
  set(parent_target opencv_samples_${sub})
  if(NOT TARGET ${parent_target})
    add_custom_target(${parent_target})
    if(TARGET opencv_samples)
      add_dependencies(opencv_samples ${parent_target})
    endif()
  endif()
  add_dependencies(${parent_target} ${the_target})
  set(${out_target} ${the_target} PARENT_SCOPE)
endfunction()

if(NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_LIST_DIR)
#===================================================================================================
#
# Build as part of OpenCV
#
#===================================================================================================

function(ocv_install_example_src relpath)
  if(INSTALL_C_EXAMPLES)
    file(GLOB files ${ARGN})
    install(FILES ${files}
            DESTINATION "${OPENCV_SAMPLES_SRC_INSTALL_PATH}/${relpath}"
            COMPONENT samples)
  endif()
endfunction()

add_subdirectory(cpp)
add_subdirectory(java/tutorial_code)
add_subdirectory(dnn)
add_subdirectory(gpu)
add_subdirectory(tapi)
add_subdirectory(opencl)
if(WIN32 AND HAVE_DIRECTX)
  add_subdirectory(directx)
endif()
if((NOT ANDROID) AND HAVE_OPENGL)
  add_subdirectory(opengl)
endif()
if(HAVE_OPENVX)
  add_subdirectory(openvx)
endif()
if(UNIX AND NOT ANDROID AND (HAVE_VA OR HAVE_VA_INTEL))
  add_subdirectory(va_intel)
endif()
if(ANDROID AND BUILD_ANDROID_EXAMPLES)
  add_subdirectory(android)
endif()
if(INSTALL_PYTHON_EXAMPLES)
  add_subdirectory(python)
endif()

ocv_install_example_src("." CMakeLists.txt)
if(INSTALL_C_EXAMPLES)
  install(DIRECTORY data DESTINATION "${OPENCV_SAMPLES_SRC_INSTALL_PATH}" COMPONENT samples_data)
endif()

else()
#===================================================================================================
#
#  Standalone mode
#
#===================================================================================================
cmake_minimum_required(VERSION 3.1)

# Enable C++11
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED TRUE)

project(samples C CXX)
option(BUILD_EXAMPLES "Build samples" ON)

# Assuming following installation folder structure (default for UNIX):
# <install_root>/share/
# └── OpenCV/  <-- OPENCV_CONFIG_INSTALL_PATH
#     ├── OpenCVConfig.cmake  <-- file to be found by find_package
#     ├── ...
#     ├── samples/  <-- OPENCV_SAMPLES_SRC_INSTALL_PATH
#     │   ├── CMakeLists.txt  <-- this file
#     │   ├── cpp/
find_package(OpenCV REQUIRED PATHS "..")

function(ocv_install_example_src)
  # not used in this branch
endfunction()

if(MSVC)
  if(NOT ENABLE_BUILD_HARDENING)
    add_definitions(-D_CRT_SECURE_NO_WARNINGS)
  endif()

  if(NOT OpenCV_SHARED)
    foreach(flag_var
            CMAKE_C_FLAGS CMAKE_C_FLAGS_DEBUG CMAKE_C_FLAGS_RELEASE
            CMAKE_C_FLAGS_MINSIZEREL CMAKE_C_FLAGS_RELWITHDEBINFO
            CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
            CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
      if(${flag_var} MATCHES "/MD")
        string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
      endif()
      if(${flag_var} MATCHES "/MDd")
        string(REGEX REPLACE "/MDd" "/MTd" ${flag_var} "${${flag_var}}")
      endif()
    endforeach(flag_var)

    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /NODEFAULTLIB:atlthunk.lib /NODEFAULTLIB:msvcrt.lib /NODEFAULTLIB:msvcrtd.lib")
    set(CMAKE_EXE_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG} /NODEFAULTLIB:libcmt.lib")
    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /NODEFAULTLIB:libcmtd.lib")
  endif()
endif()

add_definitions(-DDISABLE_OPENCV_24_COMPATIBILITY=1)  # Avoid C-like legacy API

add_subdirectory(cpp)
if(WIN32)
  add_subdirectory(directx)
endif()
add_subdirectory(dnn)
# add_subdirectory(gpu)
add_subdirectory(opencl)
# add_subdirectory(opengl)
# add_subdirectory(openvx)
add_subdirectory(tapi)
# add_subdirectory(va_intel)

endif()