Rename CMake target executorch to executorch_prim_ops

[kirklandsign]

Summary

The executorch CMake target only contains 3 prim_ops files (et_copy_index.cpp, et_view.cpp, register_prim_ops.cpp) linked on top of executorch_core. The name executorch was misleading — it suggested the full runtime, but it's just prim_ops registration.

Rename the target to executorch_prim_ops across all CMakeLists.txt and .cmake files. Update the definition-site comment to accurately describe what the target provides. Update the required_lib_list in executorch-config.cmake so find_library looks for the new name.

The CMake package name (find_package(executorch ...)) and project namespace aliases (executorch::backends etc.) are unchanged.

Test plan

CI

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/19624

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❗ 2 Active SEVs

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❌ 11 New Failures, 1 Pending, 6 Unrelated Failures, 6 Unclassified Failures

As of commit 4315f91 with merge base c4ec988 ():

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
• Lint / link-check / lint-urls (gh)
  Process completed with exit code 1.
• Lint / lintrunner (gh)
  >>> Lint for kernels/prim_ops/test/CMakeLists.txt:
• trunk / test-arm-backend-zephyr (ethos-u55) / linux-job (gh)
  RuntimeError: Command docker exec -t 4fe0329772eb4f7f0a07a12e4a5421d54cee169996bac586dd8ea40a26c71ee7 /exec failed with exit code 1
• trunk / test-arm-backend-zephyr (ethos-u85) / linux-job (gh)
  RuntimeError: Command docker exec -t e3a7e70b583808b191444ccf0dc2c0faa2e039124793cd14edd1e34fd077eb5f /exec failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 2
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos-cpu (mv3, xnnpack-quantization-delegation) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-selective-build-macos (cmake) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-static-llama-ane / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Build macOS Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Process completed with exit code 1.
• Build macOS Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_
• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Process completed with exit code 1.
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• Check Labels / Check labels (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: GraphQL query
• MLX / test-mlx-llm (google/gemma-4-E2B-it, gemma4-e2b, true, 4w, macos-15-xlarge) / test-mlx-llm-gemma4-e2b-custom-4w (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-moshi-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjpeg2/libopenjp2-7_2.4.0-6ubuntu0.4_amd64.deb 404 Not Found [IP: 172.66.152.176 80]
• pull / unittest / macos / macos-job (gh) (similar failure)
  ##[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

• MLX / test-mlx-qwen35-moe / test-mlx-qwen35-moe (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• Test Metal Backend / test-metal-qwen35-moe-tiny / macos-job (gh) (trunk failure)
  /Users/ec2-user/runner/_work/executorch/executorch/pytorch/executorch/examples/models/qwen3_5_moe/main.cpp:65:16: error: use of undeclared identifier 'cudaSuccess'
• trunk / unittest-release / macos / macos-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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