Update CMakeLists.txt to use globbing, and support arch. dependent files

CONFIGURE_DEPENDS option was added in CMake v3.12. This option allows the
build system to automatically re-run CMake if the glob changes, solving the
major issue with globbing. May have a performance impact, but it should be
negligible compared to the time spent building.

CMakeLists.txt

@@ -3,15 +3,27 @@ cmake_minimum_required(VERSION 3.5)
 project(mtl LANGUAGES CXX C ASM)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(TARGET_SRC_FILES src/memcpy.s src/string.cpp src/string_view.cpp src/fixed.s)
-set(TARGET_PUB_INCLUDE_FILES include/mtl/utility.hpp include/mtl/string.hpp include/mtl/string_view.hpp include/mtl/fsm.hpp)
+message("Compiling MTL for ${CMAKE_SYSTEM_PROCESSOR}")
 
-add_library(${PROJECT_NAME} STATIC ${TARGET_SRC_FILES} ${TARGET_PUB_INCLUDE_FILES})
+# CONFIGURE_DEPENDS option was added in CMake v3.12. This option allows the
+# build system to automatically re-run CMake if the glob changes, solving the
+# major issue with globbing. May have a performance impact, but it should be
+# negligible compared to the time spent building.
+file(GLOB mtl_sources_common LIST_DIRECTORIES false CONFIGURE_DEPENDS src/*.cpp src/*.c src/*.s)
+file(GLOB mtl_sources_armv4t LIST_DIRECTORIES false CONFIGURE_DEPENDS src/armv4t/*.cpp src/armv4t/*.c src/armv4t/*.s)
 
-target_include_directories(${PROJECT_NAME} PUBLIC "include")
+set(mtl_include_common "include")
+set(mtl_include_armv4t "include/armv4t")
 
-set_target_properties(${PROJECT_NAME} PROPERTIES PUBLIC_HEADER "${TARGET_PUB_INCLUDE_FILES}")
+add_library(${PROJECT_NAME} STATIC)
+
+target_sources(${PROJECT_NAME} PRIVATE "${mtl_sources_common}")
+target_include_directories(${PROJECT_NAME} PUBLIC "${mtl_include_common}")
+
+if (CMAKE_SYSTEM_PROCESSOR STREQUAL "armv4t")
+	target_sources(${PROJECT_NAME} PRIVATE "${mtl_sources_armv4t}")
+	target_include_directories(${PROJECT_NAME} PUBLIC "${mtl_include_armv4t}")
+endif()
+
+# TODO: Support installing library
 
-install(TARGETS ${PROJECT_NAME}
-	LIBRARY DESTINATION lib
-	PUBLIC_HEADER DESTINATION include)