FreeRTOS port for BF70x and multi-threading C standard library (libcmt): linker error

Question

Hi all, 
 in another CCES project for BF70x we're also using FreeRTOS. 
 However, when activating the linker switch "-threads" ("Link against thread-safe run-time libraries") the linker fails: 
 [Error li1021] The following symbols referenced in processor 'P0' could not be resolved:
 'adi_osal_ThreadEnableCycleCounting [_adi_osal_ThreadEnableCycleCounting]' referenced from 'libcmt.dlb[osal_thread_cycles.doj]'
 'adi_osal_ThreadGetCycleCount [_adi_osal_ThreadGetCycleCount]' referenced from 'libcmt.dlb[osal_thread_cycles.doj]'
 
 I could not find the two functions being defined in the ADI OSAL for FreeRTOS. 
 Any ideas? 
 Is using the "-threads" switch wrong/unneccessary? 
 Best regards, Matthias

MurrayA · Accepted Answer

Hi Matthias, The -threads switch is necessary for proper support in the ADI provided libraries; it links against a version of the libraries which calls into thread safe routines to deal with Mutexes, thread local storage, etc. 
 These API's are required for the instrumented profiling feature (the -p switch, or "Enable compiler instrumented profiling (-p) in the Compiler settings under "Processor"), which isn't currently supported in under FreeRTOS. We'll revisit the issue to see if we can provide meaningful thread timing information here or better diagnostics. In the mean time, disabling the instrumented profiling should avoid the link error. Regards, 
 Murray)

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FreeRTOS port for BF70x and multi-threading C standard library (libcmt): linker error