message: python: add special targets gen_opencv_python2(3)
diff: @@ -48,17 +48,28 @@ set(cv2_generated_hdrs
  "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_funcs.h"
  "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_types.h"
  "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_type_reg.h"
  - "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_ns_reg.h")
  + "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_ns_reg.h"
  +)
  +
  +set(OPENCV_${PYTHON}_SIGNATURES_FILE "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_signatures.json" CACHE INTERNAL "")
  +
  +set(cv2_generated_files ${cv2_generated_hdrs}
  + "${OPENCV_${PYTHON}_SIGNATURES_FILE}"
  +)
  string(REPLACE ";" "\n" opencv_hdrs_ "${opencv_hdrs}")
  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/headers.txt" "${opencv_hdrs_}")
  add_custom_command(
  - OUTPUT ${cv2_generated_hdrs}
  + OUTPUT ${cv2_generated_files}
  COMMAND ${PYTHON_DEFAULT_EXECUTABLE} "${PYTHON_SOURCE_DIR}/src2/gen2.py" ${CMAKE_CURRENT_BINARY_DIR} "${CMAKE_CURRENT_BINARY_DIR}/headers.txt" "${PYTHON}"
  DEPENDS ${PYTHON_SOURCE_DIR}/src2/gen2.py
  DEPENDS ${PYTHON_SOURCE_DIR}/src2/hdr_parser.py
  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/headers.txt
  - DEPENDS ${opencv_hdrs})
  + DEPENDS ${opencv_hdrs}
  + COMMENT "Generate files for ${the_module}"
  +)
  +
  +add_custom_target(gen_${the_module} DEPENDS ${cv2_generated_files})
  set(cv2_custom_hdr "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_custom_headers.h")
  file(WRITE ${cv2_custom_hdr} "//user-defined headers\n")
  @@ -67,6 +78,7 @@ foreach(uh ${opencv_userdef_hdrs})
  endforeach(uh)
  ocv_add_library(${the_module} MODULE ${PYTHON_SOURCE_DIR}/src2/cv2.cpp ${cv2_generated_hdrs} ${opencv_userdef_hdrs} ${cv2_custom_hdr})
  +add_dependencies(${the_module} gen_${the_module})
  if(APPLE)
  set_target_properties(${the_module} PROPERTIES LINK_FLAGS "-undefined dynamic_lookup")
  