opencv/apps/CMakeLists.txt

add_definitions(-D__OPENCV_BUILD=1)
add_definitions(-D__OPENCV_APPS=1)

link_libraries(${OPENCV_LINKER_LIBS})

macro(ocv_add_app directory)
  if(DEFINED BUILD_APPS_LIST)
    list(FIND BUILD_APPS_LIST ${directory} _index)
    if (${_index} GREATER -1)
      add_subdirectory(${directory})
    else()
      message(STATUS "Skip OpenCV app: ${directory}")
    endif()
  else()
    add_subdirectory(${directory})
  endif()
endmacro()

ocv_add_app(traincascade)
ocv_add_app(createsamples)
ocv_add_app(annotation)
ocv_add_app(visualisation)
ocv_add_app(interactive-calibration)
ocv_add_app(version)
Added compatibility headers 12 years ago			`add_definitions(-D__OPENCV_BUILD=1)`
trace: initial support for code trace 8 years ago			`add_definitions(-D__OPENCV_APPS=1)`

cmake: fix linker deps for CUDA 11 years ago			`link_libraries(${OPENCV_LINKER_LIBS})`
Main module headers are moved 1 level up e.g. <opencv2/core/core.hpp> become <opencv2/core.hpp> Also renamed <opencv2/core/opengl_interop.hpp> to <opencv2/core/opengl.hpp> 12 years ago
cmake: add BUILD_APPS_LIST - build "opencv_version" only: `cmake -DBUILD_APPS_LIST=version ...` - option 'BUILD_opencv_apps' should be 'ON' 7 years ago			`macro(ocv_add_app directory)`
			`if(DEFINED BUILD_APPS_LIST)`
			`list(FIND BUILD_APPS_LIST ${directory} _index)`
			`if (${_index} GREATER -1)`
			`add_subdirectory(${directory})`
			`else()`
			`message(STATUS "Skip OpenCV app: ${directory}")`
			`endif()`
			`else()`
			`add_subdirectory(${directory})`
			`endif()`
			`endmacro()`

			`ocv_add_app(traincascade)`
			`ocv_add_app(createsamples)`
			`ocv_add_app(annotation)`
			`ocv_add_app(visualisation)`
			`ocv_add_app(interactive-calibration)`
			`ocv_add_app(version)`