cmake: relocatable package for recent CMake versions

Author: nim65s

CMakeLists.txt

@@ -68,8 +68,23 @@ ELSE(WIN32)
   SET(LINK create_symlink)
 ENDIF(WIN32)
 
+set(PYTHON_COMPONENTS Interpreter)
+if(CMAKE_VERSION VERSION_LESS "3.18")
+  # Development.Module only require headers, so it's best for our module
+  # But it's not available before CMake 3.18
+  set(PYTHON_COMPONENTS ${PYTHON_COMPONENTS} Development)
+else()
+  set(PYTHON_COMPONENTS ${PYTHON_COMPONENTS} Development.Module)
+endif()
+if(NOT CMAKE_VERSION VERSION_LESS "3.14")
+  # NumPy provides a standard CMake imported target,
+  # But it's not available before CMake 3.14
+  set(PYTHON_COMPONENTS ${PYTHON_COMPONENTS} NumPy)
+endif()
 FINDPYTHON()
-FIND_NUMPY()
+if(CMAKE_VERSION VERSION_LESS "3.14")
+  FIND_NUMPY()
+endif()
 
 IF(WIN32)
   LINK_DIRECTORIES(${PYTHON_LIBRARY_DIRS})
@@ -200,13 +215,23 @@ SET(${PROJECT_NAME}_SOURCES
 ADD_LIBRARY(${PROJECT_NAME} SHARED ${${PROJECT_NAME}_SOURCES} ${${PROJECT_NAME}_HEADERS})
 TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME}
   SYSTEM PUBLIC
-  ${Boost_INCLUDE_DIRS}
-  ${EIGEN3_INCLUDE_DIR}
-  ${PYTHON_INCLUDE_DIRS}
-  ${NUMPY_INCLUDE_DIRS}
   $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include>
   $<INSTALL_INTERFACE:include>)
 
+if(TARGET Eigen3::Eigen)
+  TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC Eigen3::Eigen)
+else()
+  TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PUBLIC ${EIGEN3_INCLUDE_DIR})
+endif()
+
+if(TARGET Python3::NumPy)
+  TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC Python3::NumPy)
+  TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PRIVATE ${Python3_INCLUDE_DIRS})
+else()
+  TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PUBLIC ${NUMPY_INCLUDE_DIRS})
+  TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PRIVATE ${PYTHON_INCLUDE_DIRS})
+endif()
+
 IF(SUFFIX_SO_VERSION)
   SET_TARGET_PROPERTIES(${PROJECT_NAME} PROPERTIES SOVERSION ${PROJECT_VERSION})
 ENDIF(SUFFIX_SO_VERSION)
@@ -217,7 +242,12 @@ ELSE()
   TARGET_COMPILE_OPTIONS(${PROJECT_NAME} PRIVATE $<$<CXX_COMPILER_ID:MSVC>:-bigobj>)
 ENDIF()
 
-TARGET_LINK_BOOST_PYTHON(${PROJECT_NAME} PUBLIC)
+if(TARGET Boost::python3${Python3_VERSION_MINOR} AND NOT APPLE)
+  TARGET_LINK_LIBRARIES(${PROJECT_NAME} PUBLIC Boost::python3${Python3_VERSION_MINOR})
+else()
+  TARGET_LINK_BOOST_PYTHON(${PROJECT_NAME} PUBLIC)
+  TARGET_INCLUDE_DIRECTORIES(${PROJECT_NAME} SYSTEM PUBLIC ${Boost_INCLUDE_DIRS})
+endif()
 INSTALL(TARGETS ${PROJECT_NAME}
   EXPORT ${TARGETS_EXPORT_NAME}
   PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_FULL_INCLUDEDIR}