message: cmake: fix GCC precompiled headers warnings
diff: @@ -196,18 +196,20 @@ MACRO(ADD_PRECOMPILED_HEADER_TO_TARGET _targetName _input _pch_output_to_use )
  _PCH_GET_TARGET_COMPILE_FLAGS(_target_cflags ${_name} ${_pch_output_to_use} ${_dowarn})
  #MESSAGE("Add flags ${_target_cflags} to ${_targetName} " )
  + if(CMAKE_COMPILER_IS_GNUCXX)
  + set(_target_cflags "${_target_cflags} -include \"${CMAKE_CURRENT_BINARY_DIR}/${_name}\"")
  + endif()
  GET_TARGET_PROPERTY(_sources ${_targetName} SOURCES)
  FOREACH(src ${_sources})
  if(NOT "${src}" MATCHES "\\.mm$")
  get_source_file_property(_flags "${src}" COMPILE_FLAGS)
  - if(_flags)
  - set(_flags "${_flags} ${_target_cflags}")
  + get_source_file_property(_flags2 "${src}" COMPILE_DEFINITIONS)
  + if(NOT _flags AND NOT _flags2)
  + set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_target_cflags}")
  else()
  - set(_flags "${_target_cflags}")
  + #ocv_debug_message("Skip PCH, flags: ${oldProps} defines: ${oldProps2}, file: ${src}")
  endif()
  -
  - set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${_flags}")
  endif()
  ENDFOREACH()
  @@ -284,20 +286,6 @@ MACRO(ADD_PRECOMPILED_HEADER _targetName _input)
  DEPENDS ${_targetName}_pch_dephelp
  )
  - get_target_property(_sources ${_targetName} SOURCES)
  - foreach(src ${_sources})
  - if(NOT "${src}" MATCHES "\\.mm$")
  - get_source_file_property(oldProps "${src}" COMPILE_FLAGS)
  - get_source_file_property(oldProps2 "${src}" COMPILE_DEFINITIONS)
  - if(NOT oldProps AND NOT oldProps2)
  - set(newProperties "-include \"${CMAKE_CURRENT_BINARY_DIR}/${_name}\"")
  - set_source_files_properties("${src}" PROPERTIES COMPILE_FLAGS "${newProperties}")
  - else()
  - ocv_debug_message("Skip PCH, flags: ${oldProps} defines: ${oldProps2}, file: ${src}")
  - endif()
  - endif()
  - endforeach()
  -
  ADD_PRECOMPILED_HEADER_TO_TARGET(${_targetName} ${_input} ${_output} ${_dowarn})
  ENDMACRO(ADD_PRECOMPILED_HEADER)
  