用mdk编译例程代码时出现的报错，该怎么解决？

Fatal error: C3900U: Unrecognized option '-fno-common'.
Fatal error: C3900U: Unrecognized option '-fdata-sections'.
Fatal error: C3900U: Unrecognized option '-ffreestanding'.
Fatal error: C3900U: Unrecognized option '-fno-builtin'.
Warning: C3910W: Old syntax, please use '-M'.
Warning: C3910W: Old syntax, please use '--thumb'.