Marlin_Firmware/Marlin/src/HAL/STM32F1/build_flags.py

from __future__ import print_function
import sys

#dynamic build flags for generic compile options
if __name__ == "__main__":
  args = " ".join([ "-std=gnu++14",
                    "-Os",
                    "-mcpu=cortex-m3",
                    "-mthumb",

                    "-fsigned-char",
                    "-fno-move-loop-invariants",
                    "-fno-strict-aliasing",
                    "-fsingle-precision-constant",

                    "--specs=nano.specs",
                    "--specs=nosys.specs",

                    "-IMarlin/src/HAL/STM32F1",

                    "-MMD",
                    "-MP",
                    "-DTARGET_STM32F1"
                  ])

  for i in range(1, len(sys.argv)):
    args += " " + sys.argv[i]

  print(args)

# extra script for linker options
else:
  import pioutil
  if pioutil.is_pio_build():
    from SCons.Script import DefaultEnvironment
    env = DefaultEnvironment()
    env.Append(
      ARFLAGS=["rcs"],

      ASFLAGS=["-x", "assembler-with-cpp"],

      CXXFLAGS=[
        "-fabi-version=0",
        "-fno-use-cxa-atexit",
        "-fno-threadsafe-statics"
      ],
      LINKFLAGS=[
        "-Os",
        "-mcpu=cortex-m3",
        "-ffreestanding",
        "-mthumb",
        "--specs=nano.specs",
        "--specs=nosys.specs",
        "-u_printf_float",
      ],
    )