import os
import sys
import rtconfig

if os.getenv('RTT_ROOT'):
    RTT_ROOT = os.getenv('RTT_ROOT')
else:
    RTT_ROOT = os.path.normpath(os.getcwd() + '/../../..')

sys.path = sys.path + [os.path.join(RTT_ROOT, 'tools')]

try:
    from building import *
except:
    print('Cannot found RT-Thread root directory, please check RTT_ROOT')
    print(RTT_ROOT)
    exit(-1)

TARGET = 'rtthread_snps_emsk_em9d.' + rtconfig.TARGET_EXT

# use scons --gdb to debug emsk
AddOption('--gdb',
        dest = 'gdb',
        action = 'store_true',
        default = False,
        help = 'use gdb to debug the elf')

if GetOption('gdb'):
        if os.path.isfile(rtconfig.TARGET):
            os.system(rtconfig.DBG + rtconfig.DBG_HW_FLAGS + rtconfig.TARGET)
        else:
            print rtconfig.TARGET + 'not exist, please build first!!'
        exit(0)

DefaultEnvironment(tools=[])
env = Environment(tools = ['mingw'],
        AS = rtconfig.AS, ASFLAGS = rtconfig.AFLAGS,
        CC = rtconfig.CC, CCFLAGS = rtconfig.CFLAGS,
        AR = rtconfig.AR, ARFLAGS = '-rc',
        LINK = rtconfig.LINK, LINKFLAGS = rtconfig.LFLAGS)
env.PrependENVPath('PATH', rtconfig.EXEC_PATH)

Export('RTT_ROOT')
Export('rtconfig')

# prepare building environment
objs = PrepareBuilding(env, RTT_ROOT)

# if the linker script changed, relink the target
Depends(TARGET, rtconfig.LINK_SCRIPT)

# make a building
DoBuilding(TARGET, objs)