Make extension_runner_util install relative

[AdrianLundell]

This removes a reference to the binary tree in the install tree.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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❌ 2 New Failures, 3 Unrelated Failures

As of commit 6fa0a43 with merge base b7ac647 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-lora-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 715db3015a4443785cecb788de17ba09aa9d7192d826569078ac819a12ac23e0 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 1a2b59f99059277d868d609cd4cd4806df3acfb346580c66e2297c00e600cdea /exec failed with exit code 1

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

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

• Apple / build-benchmark-app / macos-job (gh) (trunk failure)
  /Users/runner/work/executorch/executorch/pytorch/executorch/extension/benchmark/apple/Benchmark/Tests/LLaMA/LLaMATests.mm:103:53: error: no visible @interface for 'ExecuTorchLLMTextRunner' declares the selector 'generate:sequenceLength:withTokenCallback:error:'
• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[AdrianLundell]

Fails does not look related

[digantdesai]

Assuming CMAKE_BINARY_DIR == CMAKE_INSTALL_PREFIX?

[AdrianLundell]

My intention is to install the lib in CMAKE_INSTALL_PREFIX instead of the binary dir, if someone has a reason for placing it there they can make sure to set CMAKE_BINARY_DIR == CMAKE_INSTALL_PREFIX but I don't see why it would be a requirement.

[digantdesai]

No idea, but if the CI is green then I guess this is OK. Let me add trunk just to be sure.

[digantdesai]

Like this?

executorch/examples/cadence/CMakeLists.txt

Line 94 in b3f3111

"${CMAKE_CURRENT_LIST_DIR}/../../cmake-out/extension/runner_util/libextension_runner_util.a"

[AdrianLundell]

This change should only affect the install tree so if you want to use the build tree library instead that should still be in the same place, in the Arm example we use FindPackage to avoid direct paths and that works well.

The reason why we want to make this change is to make it possible to move around the install tree without braking anything, for example to help parallelizing testing.

[digantdesai]

Good point. Thanks.