Build cpuinfo as ExternalProject

[swolchok]

Yet another (and hopefully the last) needed ExternalProject to get EXPORT working.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• append to CMAKE_FIND_ROOT_PATH instead of setting executorch_DIR #12618
• Turn BUILD_TESTING off if EXECUTORCH_BUILD_TESTS is off #12566
• Remove bundled_program dep from mpsdelegate #12562
• Build FXDiv as ExternalProject #12561
• format even more CMakeLists.txt files #12560
• -> Build cpuinfo as ExternalProject #12513
• Convert pthreadpool to ExternalProject #12468
• Build XNNPACK as an ExternalProject #12425

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12513

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 11 New Failures, 2 Cancelled Jobs, 6 Unrelated Failures

As of commit d650396 with merge base b9bb3c1 ():

NEW FAILURES - The following jobs have failed:

• Apple / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-frameworks-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_10-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_11-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_12-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x86_64
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_11-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.11_cpu_x86_64
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_12-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.12_cpu_x86_64
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e0be899239735e349d2b9a360a1ee06a914b330f351543243577b5bc181435b6 /exec failed with exit code 1
• trunk / test-llama-torchao-lowbit / macos-job (gh)
  Missing file at path: /Users/ec2-user/runner/_work/_temp/_runner_file_commands/set_output_d8e64a2f-9036-4e37-82bc-269abf29c089
• trunk / test-models-macos (resnet50, xnnpack-quantization-delegation) / macos-job (gh)
  Can't find 'action.yml', 'action.yaml' or 'Dockerfile' under '/Users/ec2-user/runner/_work/executorch/executorch/test-infra/.github/actions/check-disk-space'. Did you forget to run actions/checkout before running your local action?

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• trunk / test-models-macos (llama2, xnnpack-quantization-delegation) / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-static-llama-ane / macos-job (gh)
  ##[error]The operation was canceled.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest / macos / macos-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose

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[swolchok]

unittest linux failures look like flakes, should be good to go, adding ciflow/trunk to make sure