Support sudo make install

Author: LimHyungTae

cpp/README.md

@@ -58,6 +58,19 @@ $ make -j 16
 > Please check your cmake version via `cmake --version`.
 > If it is lower than 3.20, it is automatically updated by `scripts/install_latest_cmake.bash` (see [here](https://github.com/url-kaist/patchwork-plusplus/blob/master/cpp/CMakeLists.txt#L31)).
 
+### sudo make install
+
+Interestingly, our repository also supports `sudo make install`.
+After the build, go to `cpp/build` directory and then just run
+
+```commandline
+sudo make install
+```
+
+Consequently, our Patchwork++ is installed in your local environment.
+An example of finding the `patchworkpp` package in another package is also provided in [example_of_find_package](https://github.com/url-kaist/patchwork-plusplus/tree/master/cpp/example_of_find_package)
+
+
 ## :runner: To run the demo codes
 > There are some example codes for your convenience!
 > Please try using Patchwork++ to segment ground points in a 3D point cloud :smiley:

cpp/patchworkpp/CMakeLists.txt

@@ -22,14 +22,24 @@ install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/
 )
 install(TARGETS ${TARGET_NAME}
   EXPORT ${PARENT_PROJECT_NAME}Config
-  LIBRARY DESTINATION lib
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
 )
 
 export(TARGETS ${TARGET_NAME}
   NAMESPACE ${PARENT_PROJECT_NAME}::
   FILE "${CMAKE_CURRENT_BINARY_DIR}/${PARENT_PROJECT_NAME}Config.cmake"
 )
+
+# To install patchworkppConfig.cmake
 install(EXPORT ${PARENT_PROJECT_NAME}Config
-  DESTINATION "${CMAKE_INSTALL_DATADIR}/${PARENT_PROJECT_NAME}/cmake"
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PARENT_PROJECT_NAME}"
   NAMESPACE ${PARENT_PROJECT_NAME}::
+)
+
+# To install patchworkppTargets.cmake
+install(EXPORT ${PARENT_PROJECT_NAME}Config
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PARENT_PROJECT_NAME}
+    NAMESPACE ${PARENT_PROJECT_NAME}::
+    FILE ${PARENT_PROJECT_NAME}Targets.cmake
 )