Yes exactly. Starting from CMSIS_5/CMSIS/NN at develop · ARM-software/CMSIS_5 · GitHub, I created a new lib folder CMSIS_NN with include/ files from Include/ and src/ file from Source/. That way the library headers are found automatically and there’s no need to hack include flags or library dependencies or something. Note that CMSIS-NN depends on CMSIS-DSP, which mbed-os has (here). When using this without mbed-os one must create / copy the CMSIS-DSP library, too.
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