Disable FLAT_TENSOR when not used

[lucylq]

See: #12393

With the cmake refactor/migration to presets (see #11457), FLAT_TENSOR was enabled wherever EXTENSION_MODULE was enabled. It's not required for most targets (should just be training and tests for now), so removing it and the rule that EXTENSION_MODULE depends on it.

Rebase on: #12544

[pytorch-bot]

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❌ 14 New Failures, 149 Pending

As of commit 6882273 with merge base 988435d ():

NEW FAILURES - The following jobs have failed:

• Build Presets / linux (linux, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  RuntimeError: Command docker exec -t 3d1837b0b414cfa24c2c9894c7a27a1a441324cdb08b2efa92c19afc643f51a6 /exec failed with exit code 2
• Build Presets / linux (linux, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
  RuntimeError: Command docker exec -t 461090b5558c3170070ccedf1ff1e41480de426f4674233021ddfa8b5411717a /exec failed with exit code 2
• Build Presets / linux (llm, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  RuntimeError: Command docker exec -t cd2b1b5ee51bb3b89fc73d6ed39a92ebc49c8eac97c6db9b1c86bb5e96f4cdd9 /exec failed with exit code 2
• Build Presets / linux (llm, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
  RuntimeError: Command docker exec -t 0b4ee978bbfe0c3aabd618f1110023f81ecf4e9926bf2171bb3934e46106a2fd /exec failed with exit code 2
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 5b85779112a78ca82001d55ae4aae54803b983fc30a56d8343bb87d1ed95f3a9 /exec failed with exit code 2
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 9ad4ac5d11884438e3995d3d1fd0051a61eb8df6e122a528ad2f0536c65ba073 /exec failed with exit code 2
• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 430876f8bb65fc88abd6e0e73d17a841f81bad6928a90d61c0eb11f3abb3b46a /exec failed with exit code 2
• pull / test-static-llama-qnn-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e5f509c785451cd5938066ff3936642362d4f187212aa9017f55d13081e9e438 /exec failed with exit code 2
• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t ca96c6dc5bb6ef04cdb530ccb731cd74957cccdb0cf5c269529127e72105c137 /exec failed with exit code 2
• trunk / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 2b4645fabba1e506ebe0bbb61d7ac084299b31d5fdb9664349ca415b53ba3a6f /exec failed with exit code 2
• trunk / test-qnn-model (fp32, ic4) / linux-job (gh)
  RuntimeError: Command docker exec -t 371b5eaa89abad35699c7ccee8bc6a19a3dfb40657d1c9d573aa0f20f8ea4fbd /exec failed with exit code 2
• trunk / test-qnn-model (fp32, w2l) / linux-job (gh)
  RuntimeError: Command docker exec -t f02236a205541d05340a93754d9977a0068044d475930ef02712a86d2f434535 /exec failed with exit code 2
• trunk / test-qnn-optimum-model (fp32, albert) / linux-job (gh)
  RuntimeError: Command docker exec -t 457f16542efa7b7a6e625bf7311be1988c7e730129e7db80442f20a896b4833c /exec failed with exit code 2
• trunk / test-qnn-optimum-model (fp32, bert) / linux-job (gh)
  RuntimeError: Command docker exec -t 8ba6ba48298d97b7f559d9b9d4a930f3f323caee35973cfea50082aaf1042b77 /exec failed with exit code 2

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[swolchok]

looks like lots of tests are saying TRAINING requires FLAT_TENSOR? https://github.com/pytorch/executorch/actions/runs/16303931818/job/46045288574#step:15:12001

[swolchok]

back to your queue; since it's a build change and it breaks builds I can't just stamp it

[lucylq]

Rebase on: #12544, which removes pybind preset from linux preset.

Previously seeing issues where:

• pybind preset turns FLAT_TENSOR on for training.
• llm preset turns FLAT_TENSOR off as it's not needed.

[lucylq]

Abandoning this PR. flat_tensor is required by extension_module for the program-data separation features we added:

executorch/extension/module/CMakeLists.txt

Lines 30 to 33 in 988435d

	target_link_libraries(
	extension_module PRIVATE executorch_core extension_data_loader
	extension_flat_tensor
	)