tensorflow: TFLite delegates/gpu/libmetal_delegate.a is missing

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System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): macOS Mojave (10.14.1)
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device: N/A
• TensorFlow installed from (source or binary): Not installed.
• TensorFlow version: master branch (latest commit 6353d940289a225cfbc104cc647b3c6970077faa)
• Python version: 3.7.2
• Installed using virtualenv? pip? conda?: Not installed, just calling shell scripts from repo
• Bazel version (if compiling from source): 0.18.0
• GCC/Compiler version (if compiling from source): N/A
• CUDA/cuDNN version: N/A
• GPU model and memory: N/A

Describe the problem Attempting to build iOS Metal TFLite Delegate with create_ios_frameworks.sh yields the following error:

$ tensorflow/lite/lib_package/create_ios_frameworks.sh -g
Starting
File /path/to/tensorflow/tensorflow/lite/lib_package/../delegates/gpu/libmetal_delegate.a doesn't exist.
It's requried for building TFLite Framework with GPU. Aborting.

Provide the exact sequence of commands / steps that you executed before running into the problem

This is how I am attempting to create the iOS framework:

$ tensorflow/lite/tools/make/download_dependencies.sh
$ tensorflow/lite/tools/make/build_ios_universal_lib.sh
$ tensorflow/lite/lib_package/create_ios_frameworks.sh -g

I saw that the -g flag got added to create_ios_frameworks.sh in 59d535a0df17eaf3033bbff73ef4e1e1988c454e. Without the flag, I am able to successfully build the framework but, as expected, the GPU is not utilized.

I know the GPU delegates only got open-sourced a couple of days ago, and before that I had unsurprisingly been getting the same error but with metal_delegate.h, which was added in fb772b781b011471dec443e1f3cd6b664958b767. Is libmetal_delegate.a supposed to be present or is it still pending open-sourcing?

Any other info / logs Include any logs or source code that would be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached.

N/A