CMake: reorder Python detection

[libftdi] / python / CMakeLists.txt

# swig_add_library behavior changed in cmake 3.13 to no longer set
# SWIG_MODULE_<target>_REAL_NAME, so restore the old behavior.
if ( POLICY CMP0078 )
  cmake_policy( SET CMP0078 OLD )
endif ()

# workaround for cmake bug #0013449
if ( NOT DEFINED CMAKE_FIND_ROOT_PATH OR NOT CMAKE_VERSION VERSION_LESS 3.0.0 )
  find_package ( SWIG REQUIRED )
else ()
  find_program ( SWIG_EXECUTABLE NAMES swig2.0 swig )
  if ( SWIG_EXECUTABLE )
    set ( SWIG_USE_FILE ${CMAKE_ROOT}/Modules/UseSWIG.cmake )
    set ( SWIG_FOUND TRUE )
  endif ()
endif ()
find_package ( PythonInterp REQUIRED )
find_package ( PythonLibs REQUIRED )

include ( UseSWIG )
include_directories ( BEFORE ${CMAKE_SOURCE_DIR}/src )
include_directories ( ${PYTHON_INCLUDE_DIRS} )
link_directories ( ${CMAKE_CURRENT_BINARY_DIR}/../src )

if ( DOCUMENTATION )
  set(CMAKE_SWIG_FLAGS -DDOXYGEN=${DOXYGEN_FOUND})
  # manually add dependency for new cmake / swig versions
  set_property(SOURCE ftdi1.i PROPERTY DEPENDS ftdi1_doc.i)
endif()
if(NOT CMAKE_VERSION VERSION_LESS 3.8.0)
  swig_add_library ( ftdi1 LANGUAGE python SOURCES ftdi1.i )
else ()
  swig_add_module ( ftdi1 python ftdi1.i )
endif()
swig_link_libraries ( ftdi1 ftdi1 )

if ( LINK_PYTHON_LIBRARY )
  swig_link_libraries ( ftdi1 ${PYTHON_LIBRARIES} )
elseif( APPLE )
  set_target_properties ( ${SWIG_MODULE_ftdi1_REAL_NAME} PROPERTIES LINK_FLAGS "-undefined dynamic_lookup" )
endif ()

set_target_properties ( ${SWIG_MODULE_ftdi1_REAL_NAME} PROPERTIES NO_SONAME ON )

execute_process ( COMMAND ${PYTHON_EXECUTABLE} -c "from distutils import sysconfig; print( sysconfig.get_python_lib( plat_specific=True, prefix='${CMAKE_INSTALL_PREFIX}' ) )"
                  OUTPUT_VARIABLE _ABS_PYTHON_MODULE_PATH
                  OUTPUT_STRIP_TRAILING_WHITESPACE )

get_filename_component ( _ABS_PYTHON_MODULE_PATH ${_ABS_PYTHON_MODULE_PATH} ABSOLUTE )
file ( RELATIVE_PATH _REL_PYTHON_MODULE_PATH ${CMAKE_INSTALL_PREFIX} ${_ABS_PYTHON_MODULE_PATH} )

set ( PYTHON_MODULE_PATH ${_REL_PYTHON_MODULE_PATH} )

install ( FILES ${CMAKE_CURRENT_BINARY_DIR}/ftdi1.py DESTINATION ${PYTHON_MODULE_PATH} )
install ( TARGETS ${SWIG_MODULE_ftdi1_REAL_NAME} LIBRARY DESTINATION ${PYTHON_MODULE_PATH} )

if ( DOCUMENTATION )
    # Run doxygen to only generate the xml
    add_custom_command ( OUTPUT ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
        COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}/doc
        COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_BINARY_DIR}/Doxyfile.xml
        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
        DEPENDS ${c_headers};${c_sources};${cpp_sources};${cpp_headers}
    )

    # generate .i from doxygen .xml
    add_custom_command ( OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i
        COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/doxy2swig.py -n
            ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
            ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i
        DEPENDS ${CMAKE_BINARY_DIR}/doc/xml/ftdi_8c.xml
    )
    add_custom_target ( doc_i DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/ftdi1_doc.i )
    add_dependencies( ${SWIG_MODULE_ftdi1_REAL_NAME} doc_i )

endif ()

set ( LIBFTDI_PYTHON_MODULE_PATH ${CMAKE_INSTALL_PREFIX}/${PYTHON_MODULE_PATH} )
set ( LIBFTDI_PYTHON_MODULE_PATH ${LIBFTDI_PYTHON_MODULE_PATH} PARENT_SCOPE ) # for ftdiconfig.cmake

add_subdirectory ( examples )