Support local install with example

CMakeLists.txt

@@ -56,8 +56,15 @@ install(TARGETS PiPCA9685_cpp
     INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
 
+# Strip the install prefix if Python_SITEARCH is underneath it
+cmake_path(
+    RELATIVE_PATH Python_SITEARCH
+    BASE_DIRECTORY "${CMAKE_INSTALL_PREFIX}"
+    OUTPUT_VARIABLE PYTHON_INSTALL_DIR
+)
+
 install(TARGETS PiPCA9685_python
-    DESTINATION ${Python_SITEARCH}
+    LIBRARY DESTINATION "${PYTHON_INSTALL_DIR}"
 )
 
 install(EXPORT PiPCA9685_export
@@ -74,3 +81,5 @@ if(NOT TARGET uninstall)
   add_custom_target(uninstall
     COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
 endif()
+
+add_subdirectory(examples/cpp)

README.md

@@ -65,3 +65,14 @@ To run the Python example, run the following command in the `examples/python/` d
 ```bash
 python3 example.py
 ```
+
+## Development
+
+If you want to work on a local copy without root access:
+```bash
+cmake -B build
+cmake --build build
+cmake --install build --prefix install
+```
+
+With this workflow, the example will be built in `./build/examples/cpp/example-cpp`.

examples/cpp/CMakeLists.txt

@@ -3,7 +3,9 @@ project(example)
 
 set(CMAKE_CXX_STANDARD 23)
 
-find_package(PiPCA9685 REQUIRED)
+if(NOT TARGET PiPCA9685::PiPCA9685)
+    find_package(PiPCA9685 REQUIRED)
+endif()
 
 add_executable(example-cpp main.cpp)
 target_link_libraries(example-cpp PiPCA9685::PiPCA9685)