Can't build CoreML Delegate

[byjlw]

🐛 Describe the bug

Trying to follow the readme https://github.com/pytorch/executorch/blob/main/backends/apple/coreml/setup.md

Running this command ./build/build_apple_frameworks.sh --coreml results in the following error

CMake Error at build/Utils.cmake:261 (message):
  Failed to resolve buck2.

  Failed to retrieve buck2 version: Error: Could not read dotslash file
  /Users/byjlw/Documents/source/working/executorch-testing/executorch/.buck2:
  No such file or directory (os error 2)

  .

  The provided buck2 binary "/usr/local/bin/buck2" reports version "None",
  but ExecuTorch needs version "99773fe6f7963a72ae5f7b737c02836e".  Ensure
  that the correct buck2 version is installed or avoid explicitly passing the
  BUCK2 version to automatically download the correct version.

Call Stack (most recent call first):
  CMakeLists.txt:331 (resolve_buck2)

Versions

Operating System Information
Darwin byjlw-mbp 23.6.0 Darwin Kernel Version 23.6.0: Mon Jul 29 21:14:30 PDT 2024; root:xnu-10063.141.2~1/RELEASE_ARM64_T6000 arm64

This is NOT something we should do normally and could cause issues with

chef, but due to libdnf hardcoding this check into the code we're forced

to set this until it is fix upstream.

rpm-software-management/libdnf#1221

VERSION_ID=11

Python Version
Python 3.11.9

PIP Version
pip 24.2 from /Users/byjlw/Documents/source/working/executorch-testing/.venv/lib/python3.11/site-packages/pip (python 3.11)

Installed Packages
attrs==24.2.0
cattrs==24.1.2
certifi==2024.8.30
charset-normalizer==3.3.2
cmake==3.30.4
coremltools @ file:///Users/byjlw/Documents/source/working/executorch-testing/executorch/backends/apple/coreml/third-party/coremltools
execnet==2.1.1
executorch @ file:///Users/byjlw/Documents/source/working/executorch-testing/executorch
executorchcoreml @ file:///Users/byjlw/Documents/source/working/executorch-testing/executorch/backends/apple/coreml/runtime/inmemoryfs
expecttest==0.2.1
filelock==3.16.1
flatbuffers==24.3.25
fsspec==2024.9.0
huggingface-hub==0.25.1
hypothesis==6.112.2
idna==3.10
iniconfig==2.0.0
Jinja2==3.1.4
MarkupSafe==2.1.5
mpmath==1.3.0
networkx==3.3
numpy==1.26.4
packaging==24.1
pandas==2.2.3
parameterized==0.9.0
pillow==10.4.0
pluggy==1.5.0
protobuf==5.28.2
pyaml==24.9.0
pytest==8.3.3
pytest-xdist==3.6.1
python-dateutil==2.9.0.post0
pytz==2024.2
PyYAML==6.0.2
regex==2024.9.11
requests==2.32.3
ruamel.yaml==0.18.6
ruamel.yaml.clib==0.2.8
safetensors==0.4.5
six==1.16.0
sortedcontainers==2.4.0
sympy==1.13.1
tabulate==0.9.0
timm==1.0.7
tokenizers==0.19.1
tomli==2.0.2
torch==2.6.0.dev20241002
torchaudio==2.5.0.dev20241002
torchsr==1.0.4
torchvision==0.20.0.dev20241002
tqdm==4.66.5
transformers==4.42.4
typing_extensions==4.12.2
tzdata==2024.2
urllib3==2.2.3
zstd==1.5.5.1

PyTorch Version
2.6.0.dev20241002

Collection Complete

[dbort]

The problem is the $(which buck2) at

executorch/build/build_apple_frameworks.sh

Line 14 in fe295b9

BUCK2=$(which buck2)

. At this point, no scripts or users should pass the BUCK2 option to cmake unless they really need to override it (maybe because they're running on a system with no network access).

@shoumikhin is going to update the script to avoid using the buck2 on the path.