Unity集成TensorFlow遇未定义符号错误，求Bazel编译特殊参数

That error pops up because your libTFModel.so only includes symbols from your custom model code, not the core TensorFlow symbols it relies on—like kColocationAttrName, which lives in TensorFlow's core framework. Here's how to fix this with Bazel:

• Update Your BUILD File First
  Make sure your Bazel target properly links against TensorFlow's core libraries. Use a cc_shared_library rule with the correct dependencies:

  cc_shared_library(
      name = "libTFModel.so",
      srcs = ["your_model_inference_code.cc"],  # Replace with your actual source file
      deps = [
          "@org_tensorflow//tensorflow/core:framework",
          "@org_tensorflow//tensorflow/core:lib",
          "@org_tensorflow//tensorflow/core:protos_all_cc",
          # Add model-specific dependencies (e.g., SavedModel loader if using SavedModel)
          # "@org_tensorflow//tensorflow/cc/saved_model:loader"
      ],
      linkshared = True,
      linkstatic = True,  # Static-links TensorFlow core into your .so (no need for separate TF libs in Unity)
      copts = ["-fPIC"],  # Required for position-independent code in shared libraries
  )
  

• Build with Correct Bazel Arguments
  Run your build command with these flags to ensure all necessary symbols are included:

  bazel build :libTFModel.so --copt=-fPIC --linkopt=-static-libstdc++
  

  • --copt=-fPIC: Ensures the output is position-independent code (mandatory for shared libraries).
  • --linkopt=-static-libstdc++: Statically links the C++ standard library, avoiding runtime issues with mismatched libstdc++ versions in Unity.

• Verify and Deploy to Unity

  • Check that the missing symbol is now in your .so with nm -D libTFModel.so | grep kColocationAttrName—you should see it listed.
  • Copy libTFModel.so to your Unity Assets/Plugins directory. If you used dynamic linking instead of static, also copy TensorFlow's core libtensorflow.so to the same folder.

This should resolve the undefined symbol error by making sure your shared library includes all the TensorFlow core symbols it needs to run smoothly in Unity.

内容的提问来源于stack exchange，提问作者pudgy