测试例子编译错误：此时不应有 -f

前面都没问题，到最后的时候出现
Generate Raw OTA image: out/blink@developerkit/binary/blink@developerkit_ota.bin ...
Generate Compressed OTA image: out/blink@developerkit/binary/blink@developerkit_ota.bin.xz ...
102848
b5bac1a4fa8764f1bc70c675139800bc
此时不应有 -f。
make.exe[1]: ***
[build/build_rules/aos_target_build.mk:397:
blink@developerkit] Error 255
make.exe: *** [build/Makefile:393: main_app] Error 2 [AliOS-Things] ERROR: "P:/C++/alios-things-AliOS-Things-master/AliOS-Things/build\cmd/win32/make.exe" returned error code 2.
[AliOS-Things] ERROR: Command "P:/C++/alios-things-AliOS-Things-master/AliOS-Things/build\cmd/win32/make.exe HOST_OS=Win32 TOOLS_ROOT=P:/C++/alios-things-AliOS-Things-master/AliOS-Things/build -e -f build/Makefile" in "P:\C++\alios-things-AliOS-Things-master\AliOS-Things"

所有例子都是这种错误，麻烦懂的帮忙看看，谢谢