Add higher granularity for CMake

CMakeLists.txt

@@ -36,6 +36,10 @@ target_compile_definitions(${PROJECT_NAME} PUBLIC
     )
 
 # Add subdir with lwow and link to the project
+set(LWOW_SYS_ADD_FILES ON)
+set(LWOW_SYS_ARCH "win32")
+set(LWOW_LL_ADD_FILES ON)
+set(LWOW_LL_ARCH "win32")
 add_subdirectory("lwow")
 target_link_libraries(${PROJECT_NAME} lwow)
 add_subdirectory("snippets")

lwow/CMakeLists.txt

@@ -7,13 +7,29 @@ message("LWOW: Entering lib source CMakeLists.txt")
 set(LWOW_LIB_NAME "lwow")
 
 # Check definitions of some key things
-if(NOT DEFINED LWOW_SYS_ARCH)
-    message("LWOW: LWOW_SYS_ARCH not defined. Using default one: \"win32\"")
-    set(LWOW_SYS_ARCH "win32")
+option(LWOW_SYS_ADD_FILES OFF)
+if (LWOW_SYS_ADD_FILES)
+    message("LWOW: LWOW_SYS_ADD_FILES is set to ON. Looking for LWOW_SYS_ARCH definition")
+    if(NOT DEFINED LWOW_SYS_ARCH)
+        message("LWOW: LWOW_SYS_ARCH not defined. Using default one: \"win32\"")
+        set(LWOW_SYS_ARCH "win32")
+    endif()
+    message("LWOW: LWOW_SYS_ARCH set to: " ${LWOW_SYS_ARCH})
+else()
+    message("LWOW: LWOW_SYS_ADD_FILES is set to OFF. User must manually implement system functions in case of operating system support")
 endif()
-if(NOT DEFINED LWOW_LL_ARCH)
-    message("LWOW: LWOW_LL_ARCH not defined. Using default one: \"win32\"")
-    set(LWOW_LL_ARCH "win32")
+
+# Low-level file
+option(LWOW_LL_ADD_FILES OFF)
+if (LWOW_LL_ADD_FILES)
+    message("LWOW: LWOW_LL_ADD_FILES is set to ON. Looking for LWOW_LL_ARCH definition")
+    if(NOT DEFINED LWOW_LL_ARCH)
+        message("LWOW: LWOW_LL_ARCH not defined. Using default one: \"win32\"")
+        set(LWOW_LL_ARCH "win32")
+    endif()
+    message("LWOW: LWOW_LL_ARCH set to: " ${LWOW_LL_ARCH})
+else()
+    message("LWOW: LWOW_LL_ADD_FILES is set to OFF. User must manually add low-level driver file to project")
 endif()
 
 # Register library to the system
@@ -22,10 +38,20 @@ add_library(${LWOW_LIB_NAME} INTERFACE)
 # Setup generic source files
 target_sources(${LWOW_LIB_NAME} PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/src/lwow/lwow.c
+    ${CMAKE_CURRENT_LIST_DIR}/src/devices/lwow_device_ds18x20.c
+    )
+
+# Add optional sources
+if (LWOW_SYS_ADD_FILES)
+target_sources(${LWOW_LIB_NAME} PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/src/system/lwow_sys_${LWOW_SYS_ARCH}.c
+    )
+endif()
+if (LWOW_LL_ADD_FILES)
+target_sources(${LWOW_LIB_NAME} PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/src/system/lwow_ll_${LWOW_LL_ARCH}.c
-    ${CMAKE_CURRENT_LIST_DIR}/src/devices/lwow_device_ds18x20.c
     )
+endif()
 
 # Setup include directories
 target_include_directories(${LWOW_LIB_NAME} INTERFACE