added some more infrastructure, and ignore some test code folders

.gitignore

@@ -197,3 +197,5 @@ dmypy.json
 .pyre/
 
 # End of https://www.gitignore.io/api/c,c++,cmake,python
+
+testcode/

CMakeLists.txt

@@ -0,0 +1,30 @@
+#Initial version referenced from: https://github.com/macosten/PetProject-m68k/blob/master/CMakeLists.txt
+
+# To use this example as a standalone project using CMake:
+# mkdir build
+# cd build
+# cmake .. -DCMAKE_TOOLCHAIN_FILE=path/to/Retro68-build/toolchain/m68k-apple-macos/cmake/retro68.toolchain.cmake
+# make
+
+cmake_minimum_required(VERSION 2.8)
+
+add_application(MicroPython
+	main.c 
+	uart_core.c 
+	#lib/utils/printf.c 
+	#lib/utils/stdout_helpers.c 
+	#lib/utils/pyexec.c 
+	#lib/libc/string0.c 
+	#lib/mp-readline/readline.c 
+	#$(BUILD)/_frozen_mpy.c 
+	)
+
+# Enable -ffunction-sections and -gc-sections to make the app as small as possible
+# On 68K, also enable --mac-single to build it as a single-segment app (so that this code path doesn't rot)
+set_target_properties(MicroPython PROPERTIES COMPILE_OPTIONS -ffunction-sections)
+if(CMAKE_SYSTEM_NAME MATCHES Retro68)
+	set_target_properties(MicroPython PROPERTIES LINK_FLAGS "-Wl,-gc-sections -Wl,--mac-single")
+
+else()
+	set_target_properties(MicroPython PROPERTIES LINK_FLAGS "-Wl,-gc-sections")
+endif()