Linking Problems when trying to build C application using Tensorflow Lite

TensorFlow General Discussion
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1

Hello,
I want to make a simple application in C (not using C++) which just uses a basic pretrained model for image classification. I want to use the basic C API as described here:

For that, I have built the static library libtensorflowlite_c.a as described here: 使用 CMake 选择性构建 TensorFlow Lite
and put that into the /usr/local/lib folder.
When trying to compile this code:

#include <stdio.h>
#include "tensorflow/lite/c/c_api.h"
int main() {
    
    TfLiteInterpreterOptions* options;
    TfLiteModel* model = TfLiteModelCreateFromFile("1.tflite");
    options = TfLiteInterpreterOptionsCreate();
    TfLiteInterpreterOptionsSetNumThreads(options, 2);
}

I get errors when trying to compile using that command:

 gcc -I. -I ../../test_folder/tensorflow_src -I ../../test_folder/tensorflow_src/tensorflow/lite/c -L/usr/local/lib -l:libtensorflowlite_c.a -o ai_test ai_test.c
/usr/bin/ld: /tmp/ccQuyKaS.o: in function `main':
ai_test.c:(.text+0x17): undefined reference to `TfLiteModelCreateFromFile'
/usr/bin/ld: ai_test.c:(.text+0x25): undefined reference to `TfLiteInterpreterOptionsCreate'
/usr/bin/ld: ai_test.c:(.text+0x3a): undefined reference to `TfLiteInterpreterOptionsSetNumThreads'
collect2: error: ld returned 1 exit status

Did I misunderstand something or can somebody help me to resolve this?

Thank you in advance!

3

Hi Andib,

It looks like you might be missing some required dependencies when linking your application. Make sure you’re also linking against the other TensorFlow Lite libraries that libtensorflowlite_c.a depends on. Try adding -ltensorflowlite to your gcc command:

gcc -I. -I ../../test_folder/tensorflow_src -I ../../test_folder/tensorflow_src/tensorflow/lite/c -L/usr/local/lib -ltensorflowlite_c -ltensorflowlite -o ai_test ai_test.c

This should resolve the undefined references.

4

Hi arnoldmatt,

thank you for your reply.
Where can I get these dependencies?
When trying to execute your command, it doesn’t find that file.

gcc -I. -I ../../test_folder/tensorflow_src -I ../../test_folder/tensorflow_src/tensorflow/lite/c -L/usr/local/lib -ltensorflowlite_c -ltensorflowlite -o ai_test ai_test.c
/usr/bin/ld: cannot find -ltensorflowlite: No such file or directory
collect2: error: ld returned 1 exit status