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androidtensorflowpthreadsbazel

Is it possible to see which bazel target propagates the -lpthread flag?

When building TensorFlow with a custom toolchain (android arm64-v8a target) with Bazel, the final shared library has a dependency on libpthread.so even though it is not necessary for Android builds. The library works fine using a dummy library with the same name.

I suppose there is some external dependency that propagates the link flag since I have removed all occurences of lpthread/pthread in the TensorFlow repository.

Is it possible somehow to track which target adds a specific link flag with Bazel? The -s flag unfortunately only shows the final link command.

Solution

  • bazel query is the tool for this. This command will give you all the transitive dependencies with -lpthread (or alternate spellings like -pthread or -Wl,-lpthread) in their linkopts:

    bazel query 'attr(linkopts, "pthread", deps(//my:target))'