MarlinFirmware/buildroot/share/PlatformIO/scripts/fix_framework_weakness.py

#
# fix_framework_weakness.py
#
import pioutil
if pioutil.is_pio_build():

	import shutil
	from os.path import join, isfile
	from pprint import pprint

	Import("env")

	if env.MarlinFeatureIsEnabled("POSTMORTEM_DEBUGGING"):
		FRAMEWORK_DIR = env.PioPlatform().get_package_dir("framework-arduinoststm32-maple")
		patchflag_path = join(FRAMEWORK_DIR, ".exc-patching-done")

		# patch file only if we didn't do it before
		if not isfile(patchflag_path):
			print("Patching libmaple exception handlers")
			original_file = join(FRAMEWORK_DIR, "STM32F1", "cores", "maple", "libmaple", "exc.S")
			backup_file = join(FRAMEWORK_DIR, "STM32F1", "cores", "maple", "libmaple", "exc.S.bak")
			src_file = join("buildroot", "share", "PlatformIO", "scripts", "exc.S")

			assert isfile(original_file) and isfile(src_file)
			shutil.copyfile(original_file, backup_file)
			shutil.copyfile(src_file, original_file);

			def _touch(path):
				with open(path, "w") as fp:
					fp.write("")

			env.Execute(lambda *args, **kwargs: _touch(patchflag_path))
			print("Done patching exception handler")

		print("Libmaple modified and ready for post mortem debugging")