CC3200 oslib工程编译失败

第一次用CCS，free_rtos.a要怎么产生？我看到IAR下有这个free_rtos.a

**** Clean-only build of configuration free_rtos for project oslib ****

"C:\\TI\\ccsv6\\utils\\bin\\gmake" -k clean
DEL /F "free_rtos.a"
Could Not Find C:\TI\CC3200SDK_1.1.0\cc3200-sdk - user\oslib\ccs\free_rtos\free_rtos.a
DEL /F "croutine.pp" "heap_3.pp" "list.pp" "osi_freertos.pp" "port.pp" "queue.pp" "tasks.pp" "timers.pp"
Could Not Find C:\TI\CC3200SDK_1.1.0\cc3200-sdk - user\oslib\ccs\free_rtos\croutine.pp
DEL /F "croutine.obj" "heap_3.obj" "list.obj" "osi_freertos.obj" "port.obj" "portasm.obj" "queue.obj" "tasks.obj" "timers.obj"
Could Not Find C:\TI\CC3200SDK_1.1.0\cc3200-sdk - user\oslib\ccs\free_rtos\croutine.obj
DEL /F "portasm.pp"
Could Not Find C:\TI\CC3200SDK_1.1.0\cc3200-sdk - user\oslib\ccs\free_rtos\portasm.pp
'Finished clean'
' '

**** Build Finished ****
Buildfile generation error occurred..
Cannot build project. Referenced project 'ti_rtos_config' contains build-errors.
Build stopped..

在CCS中将free_rtos.a添加到类似下面库文件地址：

②ARM-Linker->File Search Path

"libc.a"
"${CC3200_SDK_ROOT}/simplelink/ccs/NON_OS/simplelink.a"
"${CC3200_SDK_ROOT}/driverlib/ccs/Release/driverlib.a"

-----添加free_rtos.a