ERROR: flatbuffers::flatbuffer_version_string Multiply defined Global Symbol

[fjpolo]

@tensorflow/micro

System information

• Host OS Platform and Distribution: Windows 10
• TensorFlow installed from: source
• Tensorflow version (commit SHA if source): latest
• Target platform: STM32F407IG using Keil uVision with Compiler v6

Problem

I have been trying to compile the hello_world example generated with TFLite using Keil uVision, and compiler v6 from them. After compiling for a little while, it stops with an error and I get the following output:

Build started: Project: keil_project
*** Using Compiler 'V6.12', folder: 'C:\Keil_v5\ARM\ARMCLANG\Bin'
Build target 'hello_world'
compiling common.c...
compiling error_reporter.cc...
compiling tensor_utils.cc...
compiling quantization_util.cc...
compiling op_resolver.cc...
compiling flatbuffer_conversions.cc...
compiling keyword_scrambled_model_data.cc...
compiling debug_log.cc...
compiling kernel_util.cc...
compiling constants.cc...
compiling main.cc...
compiling all_ops_resolver.cc...
compiling model.cc...
compiling output_handler.cc...
compiling activations.cc...
compiling main_functions.cc...
compiling arg_min_max.cc...
compiling add.cc...
compiling ceil.cc...
compiling circular_buffer.cc...
compiling comparisons.cc...
compiling conv.cc...
compiling concatenation.cc...
compiling depthwise_conv.cc...
compiling dequantize.cc...
compiling ethosu.cc...
compiling elementwise.cc...
compiling flexbuffers_generated_data.cc...
compiling detection_postprocess.cc...
compiling floor.cc...
compiling fully_connected.cc...
compiling kernel_runner.cc...
compiling hard_swish.cc...
compiling kernel_util.cc...
compiling logical.cc...
compiling l2norm.cc...
compiling logistic.cc...
compiling maximum_minimum.cc...
compiling neg.cc...
compiling pack.cc...
compiling mul.cc...
compiling pad.cc...
compiling pooling.cc...
compiling prelu.cc...
compiling quantize.cc...
compiling reduce.cc...
compiling resize_nearest_neighbor.cc...
compiling round.cc...
compiling reshape.cc...
compiling split.cc...
compiling softmax.cc...
compiling shape.cc...
compiling split_v.cc...
compiling strided_slice.cc...
compiling sub.cc...
compiling svdf.cc...
compiling svdf_common.cc...
compiling unpack.cc...
compiling tanh.cc...
compiling greedy_memory_planner.cc...
compiling linear_memory_planner.cc...
compiling micro_error_reporter.cc...
compiling memory_helpers.cc...
compiling micro_profiler.cc...
compiling micro_string.cc...
compiling micro_allocator.cc...
compiling micro_time.cc...
compiling micro_interpreter.cc...
compiling micro_utils.cc...
compiling recording_simple_memory_allocator.cc...
compiling recording_micro_allocator.cc...
compiling simple_memory_allocator.cc...
compiling test_conv_model.cc...
compiling retarget_io.c...
compiling test_helpers.cc...
compiling schema_utils.cc...
linking...
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(op_resolver.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(all_ops_resolver.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(main_functions.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(add.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(mul.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(reshape.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(shape.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(memory_helpers.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(micro_allocator.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(micro_interpreter.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(recording_micro_allocator.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(simple_memory_allocator.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(test_helpers.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Warning: L6439W: Multiply defined Global Symbol flatbuffers::flatbuffer_version_string defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(schema_utils.o) rejected in favor of Symbol defined in .data._ZN11flatbuffers25flatbuffer_version_stringE(flatbuffer_conversions.o).
.\Objects\hello_world.axf: Error: L6320W: Ignoring --entry command. Cannot find argument 'Reset_Handler'.
.\Objects\hello_world.axf: Warning: L6320W: Ignoring --first command. Cannot find argument '__Vectors'.
Not enough information to list image symbols.
Not enough information to list load addresses in the image map.
Finished: 2 information, 15 warning and 1 error messages.
".\Objects\hello_world.axf" - 1 Error(s), 15 Warning(s).
Target not created.
Build Time Elapsed: 00:02:12

What I could find out, is that flatbuffer_version_string is defined under flatbuffers.h, and initialised there too, so that every file including flatbuffers.h will define flatbuffer_version_string all over again. But I still cannot find a solution.

Steps

• Generate hello_world exmaple with MAKE, using the command "make -f tensorflow/lite/micro/tools/make/Makefile generate_projects hello_world"
• Open keil_project.uvprojx under hello_world/keil.
• Build .
• Wait for build to stop with error.

[wangtz]

@petewarden Pete, could you help reassign this bug to someone who's more familiar with Keil generated project?

Thanks,
Tiezhen

[fjpolo]

Fixed commenting the following lines under flatbuffers.h:

2741 to 2748

//extern volatile attribute((weak)) const char *flatbuffer_version_string;
//volatile attribute((weak)) const char *flatbuffer_version_string =
// "FlatBuffers "
// FLATBUFFERS_STRING(FLATBUFFERS_VERSION_MAJOR) "."
// FLATBUFFERS_STRING(FLATBUFFERS_VERSION_MINOR) "."
// FLATBUFFERS_STRING(FLATBUFFERS_VERSION_REVISION);

//#endif // !defined(_WIN32) && !defined(CYGWIN)

[google-ml-butler]

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