[GitHub] [incubator-tvm] tom-gall opened a new issue #6954: uTVM fails to build runtime for Arm Target

[GitBox <gi...@apache.org>]

tom-gall opened a new issue #6954:
URL: https://github.com/apache/incubator-tvm/issues/6954


   given:
   
   TARGET = tvm.target.target.micro("stm32f746xx")
   
   with tvm.transform.PassContext(
       opt_level=3, config={"tir.disable_vectorize": True}, disabled_pass=["FuseOps"]
   ):
       graph, c_mod, c_params = relay.build(mod, target=TARGET, params=params)
   
   workspace = tvm.micro.Workspace()
   
   compiler = tvm.micro.DefaultCompiler(target=TARGET)
   opts = tvm.micro.default_options(os.path.join(tvm.micro.CRT_ROOT_DIR, "stm32f746xx"))
   
   micro_binary = tvm.micro.build_static_runtime(
       workspace,
       compiler,
       c_mod,
       lib_opts=opts["bin_opts"],
       bin_opts=opts["bin_opts"],
   )
   
   Creating the runtime will fail with 
   
   arm-none-eabi-g++: error: missing argument to '-march='
   
   It's not exactly surprising since  
   RuntimeError: error while running command "arm-none-eabi-g++ -g -march=cortex-m7 -std=c++11 -Wall -Werror -I /home/tgall/tvm/tvm/include -I /home/tgall/tvm/tvm/3rdparty/dlpack/include -I /home/tgall/tvm/tvm/3rdparty/libcrc/include -I /home/tgall/tvm/tvm/3rdparty/dmlc-core/include -I /home/tgall/tvm/tvm/src/runtime/crt/include -I /home/tgall/tvm/tvm/src/runtime/crt/stm32f746xx -c -o /tmp/tmpv6j60fia/build/utvm_rpc_server/rpc_server.o /home/tgall/tvm/tvm/src/runtime/crt/utvm_rpc_server/rpc_server.cc":
   arm-none-eabi-g++: error: unrecognized -march target: cortex-m7
   
   So what is the fix?  
   
   cortex-m7 is an -mcpu setting.
   
   Instead 
   -march=armv7-m when targeting and m4
   and -march=armv7e-m when targeting an m7 (like the discovery)   
   
   Patch incoming. 
   
   @areusch 


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