Integrate CMSIS library into Firmware

Firmware
7

I am still facing a problem while using the actual fft routine.

arm_rfft_q31( &rfftStruct, buffer, buffer);

Calling the actual fft function leads to the following undefined reference:

/u/susom/cmsis-integ/CMSIS/Lib/libarm_cortexM3l_math.a(arm_cfft_q31.o): In function `arm_cfft_q31':
/u/susom/cmsis-integ/CMSIS/DSP_Lib/TransformFunctions/arm_cfft_q31.c:139: undefined reference to `arm_bitreversal_32'

arm_bitreversal_32 happens to be defined in assembly code in the CMSIS library - arm_bitreversal2.S
Any idea on how to overcome this ?

Thanks
Subhojit