old_contents: import os
  
  # toolchains options
  ARCH='arm'
  CPU='vexpress-a9'
  CROSS_TOOL='gcc'
  
  if os.getenv('RTT_CC'):
      CROSS_TOOL = os.getenv('RTT_CC')
  
  if  CROSS_TOOL == 'gcc':
      PLATFORM    = 'gcc'
      EXEC_PATH   = '/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
  elif CROSS_TOOL == 'keil':
      PLATFORM    = 'armcc'
      EXEC_PATH   = 'C:/Keil'
  
  if os.getenv('RTT_EXEC_PATH'):
      EXEC_PATH = os.getenv('RTT_EXEC_PATH')
  
  BUILD = 'debug'
  
  if PLATFORM == 'gcc':
      # toolchains
      PREFIX = 'arm-none-eabi-'
      CC = PREFIX + 'gcc'
      CXX = PREFIX + 'g++'
      AS = PREFIX + 'gcc'
      AR = PREFIX + 'ar'
      LINK = PREFIX + 'gcc'
      TARGET_EXT = 'elf'
      SIZE = PREFIX + 'size'
      OBJDUMP = PREFIX + 'objdump'
      OBJCPY = PREFIX + 'objcopy'
  
      DEVICE = ' -march=armv7-a -marm -msoft-float'
      CFLAGS = DEVICE + ' -Wall'
      AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -D__ASSEMBLY__'
      LINK_SCRIPT = 'link.lds'
      LFLAGS = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors'+\
                        ' -T %s' % LINK_SCRIPT
  
      CPATH = ''
      LPATH = ''
  
      # generate debug info in all cases
      AFLAGS += ' -gdwarf-2'
      CFLAGS += ' -g -gdwarf-2'
  
      if BUILD == 'debug':
          CFLAGS += ' -O0'
      else:
          CFLAGS += ' -O2'
  
      CXXFLAGS = CFLAGS
  
      POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' +\
                    SIZE + ' $TARGET \n'
  
  elif PLATFORM == 'armcc':
      # toolchains
      CC = 'armcc'
      CXX = 'armcc'
      AS = 'armasm'
      AR = 'armar'
      LINK = 'armlink'
      TARGET_EXT = 'axf'
  
      DEVICE = ' --device DARMP'
      CFLAGS = DEVICE + ' --apcs=interwork'
      AFLAGS = DEVICE
      LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread.map --scatter rtthread.sct'
  
      CFLAGS += ' -I' + EXEC_PATH + '/ARM/RV31/INC'
      LFLAGS += ' --libpath ' + EXEC_PATH + '/ARM/RV31/LIB'
  
      EXEC_PATH += '/arm/bin40/'
  
      if BUILD == 'debug':
          CFLAGS += ' -g -O0'
          AFLAGS += ' -g'
      else:
          CFLAGS += ' -O2'
  
      POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'
  
  elif PLATFORM == 'iar':
      # toolchains
      CC = 'iccarm'
      AS = 'iasmarm'
      AR = 'iarchive'
      LINK = 'ilinkarm'
      TARGET_EXT = 'out'
  
      DEVICE = ' --cpu DARMP'
  
      CFLAGS = ''
      AFLAGS = ''
      LFLAGS = ' --config rtthread.icf'
  
      EXEC_PATH += '/arm/bin/'
      RT_USING_MINILIBC = False
      POST_ACTION = ''
  
new_contents: import os
  
  # toolchains options
  ARCH='arm'
  CPU='vexpress-a9'
  CROSS_TOOL='gcc'
  
  if os.getenv('RTT_CC'):
      CROSS_TOOL = os.getenv('RTT_CC')
  
  PLATFORM    = 'gcc'
  EXEC_PATH   = '/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'
  
  if os.getenv('RTT_EXEC_PATH'):
      EXEC_PATH = os.getenv('RTT_EXEC_PATH')
  
  BUILD = 'debug'
  
  if PLATFORM == 'gcc':
      # toolchains
      PREFIX = 'arm-none-eabi-'
      CC = PREFIX + 'gcc'
      CXX = PREFIX + 'g++'
      AS = PREFIX + 'gcc'
      AR = PREFIX + 'ar'
      LINK = PREFIX + 'gcc'
      TARGET_EXT = 'elf'
      SIZE = PREFIX + 'size'
      OBJDUMP = PREFIX + 'objdump'
      OBJCPY = PREFIX + 'objcopy'
  
      DEVICE = ' -march=armv7-a -marm -msoft-float'
      CFLAGS = DEVICE + ' -Wall'
      AFLAGS = ' -c' + DEVICE + ' -x assembler-with-cpp -D__ASSEMBLY__'
      LINK_SCRIPT = 'link.lds'
      LFLAGS = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors'+\
                        ' -T %s' % LINK_SCRIPT
  
      CPATH = ''
      LPATH = ''
  
      # generate debug info in all cases
      AFLAGS += ' -gdwarf-2'
      CFLAGS += ' -g -gdwarf-2'
  
      if BUILD == 'debug':
          CFLAGS += ' -O0'
      else:
          CFLAGS += ' -O2'
  
      CXXFLAGS = CFLAGS
  
      POST_ACTION = OBJCPY + ' -O binary $TARGET rtthread.bin\n' +\
                    SIZE + ' $TARGET \n'
  
subject: Update rtconfig.py for QEMU.