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[executorch][native] Run engines on bundled op samples with gtest - #24535

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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #24360 by @digantdesai
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/digantdesai/187/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/187/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/digantdesai/186/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/187/orig

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Pull Request resolved: #24360

The bundled samples need a harness that runs on any engine. `sample_test_main` registers one gtest per package and method and judges each output with `OutputCheck`; unsupported ops, dtypes and shapes fail. `ggml_sample_test{,_cuda,_hip}` and `vulkan_sample_test` run it on `op_samples`. With CMake, `native_ggml_sample_test` (CPU) and `native_vulkan_sample_test` depend on `native_op_samples` and run it on its output. The sample tests are manual for now, since gaps fail: `ci.skip_test` in Buck and `DISABLED` in CTest. The README says how to run them and what the generator needs. `vulkan_sample_test` runs on SwiftShader like `vulkan_engine_test`; preloading a driver's `libvulkan.so.1` runs it on that driver. The ggml CUDA targets preload the CUDA driver stub through their env, so `test_ggml_ops.py` no longer puts the runner's directory on `LD_LIBRARY_PATH`.

Authored with Claude Code.

Differential Revision: [D128254880](https://our.internmc.facebook.com/intern/diff/D128254880/)

**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D128254880/)!
ghstack-source-id: 463657748
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pytorch-bot Bot commented Nov 3, 2026 •

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24535

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@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Facebook bot. Authors need to sign the CLA before a PR can be reviewed. label Nov 3, 2026

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cadence — 05446696 Deployed Nov 3, 2026 by pytorchbot via hifi-op-test / hifi4 #36366
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