Update debug information version

Author: JalonWong

gcc-arm-none-eabi.ini

@@ -10,7 +10,7 @@ needs_exe_wrapper = true
 cross_toolchain = 'ARM_TOOLCHAIN_PATH'
 cross_compile = cross_toolchain + '/bin/arm-none-eabi-'
 cpu_args = []
-base_c_args = ['-Wno-comment','-Wno-unused-const-variable','-Wno-unused-function','-Wreturn-type','-funsigned-char','-fshort-enums','-gdwarf-3','-fdata-sections','-ffunction-sections']
+base_c_args = ['-Wno-comment','-Wno-unused-const-variable','-Wno-unused-function','-Wreturn-type','-funsigned-char','-fshort-enums','-gdwarf-4','-fdata-sections','-ffunction-sections']
 additional_c_link_args = []
 base_c_link_args = ['-specs=nano.specs','-lc','-lm','-lnosys','-lsupc++_nano','-funsigned-char','-fshort-enums','-ffunction-sections','-fdata-sections','-Wl,--gc-sections']