Feature/external content (#63)

* Support out-of-source build

* (minor) update CMakeLists.txt files

* Generalize version of tar.gz target

* (minor) remove line and bump up the python version

cpp/CMakeLists.txt

@@ -1,9 +1,10 @@
 cmake_minimum_required(VERSION 3.11)
-project(patchworkpp VERSION 1.0.0)
+project(patchworkpp VERSION 1.0.1)
 
 set(CMAKE_CXX_STANDARD 20)
 set(PYTHON_EXECUTABLE python3)
 set(CMAKE_BUILD_TYPE Release)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${Open3D_C_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Open3D_CXX_FLAGS}")
@@ -58,5 +59,4 @@ if (INCLUDE_CPP_EXAMPLES)
   target_link_libraries(demo_sequential PRIVATE ${PARENT_PROJECT_NAME}::${TARGET_NAME} ${Open3D_LIBRARIES} "stdc++fs")
   target_include_directories(demo_sequential PUBLIC ${Open3D_INCLUDE_DIRS})
   set_target_properties(demo_sequential PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/examples")
-
-endif()
+endif()

python/CMakeLists.txt

@@ -15,14 +15,22 @@ set(TARGET_NAME ground_seg_cores)
 find_package(Python COMPONENTS Interpreter Development.Module REQUIRED)
 find_package(pybind11 CONFIG REQUIRED)
 
+# See our `pyproject.toml` file. We use `scikit_build_core`, which turns on `SKBUILD`
+if (DEFINED SKBUILD)
+    message(STATUS "Building with Scikit-Build")
+endif ()
+
 if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/../cpp/)
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../cpp ${CMAKE_CURRENT_BINARY_DIR}/patchworkpp_cpp)
 else()
   cmake_minimum_required(VERSION 3.18)
   message(STATUS "Performing out-of-tree build, fetching Patchwork++ v${CMAKE_PROJECT_VERSION} Release from Github")
   include(FetchContent)
-  # Currently, out-of-source build is not supported.
-  # But, it will be updated soon!
+  FetchContent_Declare(
+    ext_ground_seg_cores PREFIX ${PARENT_PROJECT_NAME}
+    URL https://github.com/url-kaist/patchwork-plusplus/archive/refs/tags/v${CMAKE_PROJECT_VERSION}.tar.gz SOURCE_SUBDIR
+        cpp/patchworkpp)
+  FetchContent_MakeAvailable(ext_ground_seg_cores)
 endif()
 
 pybind11_add_module(pypatchworkpp patchworkpp/pybinding.cpp)

python/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "pypatchworkpp"
-version = "0.1.0"
+version = "1.0.1"
 requires-python = ">=3.8"
 description = "ground segmentation"
 dependencies = [