Add install rule for cmake modules

CMakeLists.txt

@@ -23,12 +23,13 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
 
 enable_testing()
 
-add_subdirectory(cpp)
-add_subdirectory(protos)
-
 include(GNUInstallDirs)
 include(CMakePackageConfigHelpers)
 
+add_subdirectory(cmake)
+add_subdirectory(cpp)
+add_subdirectory(protos)
+
 write_basic_package_version_file(
   ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake
   COMPATIBILITY AnyNewerVersion

cmake/CMakeLists.txt

@@ -0,0 +1,17 @@
+# Install CMake modules so they can reused downstream
+# Reference:
+# "Modern CMake Modules - Bret Brown - CppCon 2021"
+#   https://www.youtube.com/watch?v=IZXNsim9TWI
+
+install(
+    FILES
+        farm_ng_add_library.cmake
+        farm_ng_add_protobufs.cmake
+        farm_ng_add_test.cmake
+        farm_ng_ccache.cmake
+        farm_ng_dev_packages.cmake
+        farm_ng_macos_ssl_fix.cmake
+        farm_ng_module.cmake
+    DESTINATION ${CMAKE_INSTALL_DATADIR}/${PROJECT_NAME}
+    COMPONENT cmake-farm-ng-core
+)