promote TARGETS content into placeholder BUCK files (#20407)

[bigfootjon]

Summary:

Chunk 4 of fbcode/executorch TARGETS->BUCK migration. 9 directories where
TARGETS contained the real fbcode-side build rules and BUCK was a tiny
placeholder (most were 4-8 lines like 'empty BUCK file to unblock landing').
Each TARGETS was scanned for fbcode-only constructs (fbcode_macros,
fbcode_target(, cpp_unittest(, cpp_library(, cpp_binary(,
re_test_utils, keep_gpu_sections, buck_genrule, //tools/build/buck/)
and only those without any of those flags are migrated here.

The TARGETS content is copied into BUCK (overwriting the placeholder) and
the TARGETS file is deleted. fbcode now resolves these dirs via BUCK
instead of TARGETS; the rules also become visible to xplat for the first
time via dirsync.

Directories migrated:

• backends/apple/mps
• backends/xnnpack/serialization
• devtools/bundled_program
• devtools/bundled_program/schema
• devtools/etdump/fb
• exir/emit
• extension/pytree
• extension/training
• kernels/portable/test

8 PROMOTE candidates remain on TARGETS for follow-up: backends/cortex_m/test,
examples/models/llama/fb, examples/qualcomm/oss_scripts/{llama,whisper},
exir/dialects/edge/test, exir/tests, kernels/fb/custom_ops, test/end2end.
They have fbcode-only loads (fbcode_macros) or kwargs and need
is_fbcode() gating.

Reviewed By: mzlee

Differential Revision: D109082058

[pytorch-bot]

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[meta-codesync]

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[Copilot]

Pull request overview

Migrates additional directories in the fbcode ExecuTorch TARGETS→BUCK transition by deleting TARGETS files (previously the source of truth) and promoting their contents into BUCK files so fbcode resolves these packages via BUCK and the rules become visible to xplat via dirsync.

Changes:

• Deleted placeholder (or now-redundant) TARGETS files across multiple directories.
• Promoted real build rules from TARGETS into BUCK for several packages (e.g., MPS, XNNPACK serialization, bundled_program, pytree, portable test).
• Updated some BUCK entrypoints to pass is_fbcode() into define_common_targets where the corresponding targets.bzl supports fbcode/xplat divergence.

Reviewed changes

Copilot reviewed 64 out of 72 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/TARGETS	Delete TARGETS entrypoint
schema/test/TARGETS	Delete TARGETS entrypoint
schema/TARGETS	Delete TARGETS entrypoint
runtime/platform/test/TARGETS	Delete TARGETS entrypoint
runtime/platform/TARGETS	Delete TARGETS entrypoint
runtime/core/TARGETS	Delete TARGETS entrypoint
runtime/core/exec_aten/util/TARGETS	Delete TARGETS entrypoint
runtime/core/exec_aten/testing_util/test/TARGETS	Delete TARGETS entrypoint
runtime/core/exec_aten/testing_util/TARGETS	Delete TARGETS entrypoint
runtime/core/exec_aten/TARGETS	Delete TARGETS entrypoint
runtime/backend/test/TARGETS	Delete TARGETS entrypoint
runtime/backend/TARGETS	Delete TARGETS entrypoint
kernels/prim_ops/TARGETS	Delete TARGETS entrypoint
kernels/portable/test/TARGETS	Delete TARGETS build rules
kernels/portable/test/BUCK	Promote TARGETS rules into BUCK
kernels/portable/cpu/util/test/TARGETS	Delete TARGETS entrypoint
kernels/portable/cpu/util/TARGETS	Delete TARGETS entrypoint
kernels/optimized/test/TARGETS	Delete TARGETS entrypoint
kernels/optimized/TARGETS	Delete TARGETS entrypoint
kernels/optimized/cpu/TARGETS	Delete TARGETS entrypoint
kernels/optimized/BUCK	Use is_fbcode() in BUCK
extension/training/TARGETS	Delete TARGETS build rules
extension/training/BUCK	Promote TARGETS rules into BUCK
extension/threadpool/test/TARGETS	Delete TARGETS entrypoint
extension/threadpool/TARGETS	Delete TARGETS entrypoint
extension/testing_util/test/TARGETS	Delete TARGETS entrypoint
extension/testing_util/TARGETS	Delete TARGETS entrypoint
extension/tensor/test/TARGETS	Delete TARGETS entrypoint
extension/tensor/TARGETS	Delete TARGETS entrypoint
extension/runner_util/test/TARGETS	Delete TARGETS entrypoint
extension/runner_util/test/BUCK	Use is_fbcode() in BUCK
extension/runner_util/TARGETS	Delete TARGETS entrypoint
extension/pytree/TARGETS	Delete TARGETS build rules
extension/pytree/BUCK	Promote TARGETS rules into BUCK
extension/pytree/aten_util/test/TARGETS	Delete TARGETS entrypoint
extension/pytree/aten_util/TARGETS	Delete TARGETS entrypoint
extension/kernel_util/test/TARGETS	Delete TARGETS entrypoint
extension/kernel_util/test/BUCK	Add BUCK entrypoint wrapper
extension/image/test/TARGETS	Delete TARGETS entrypoint
extension/image/TARGETS	Delete TARGETS entrypoint
extension/image/benchmark/TARGETS	Delete TARGETS entrypoint
extension/cuda/TARGETS	Delete TARGETS entrypoint
extension/aten_util/test/TARGETS	Delete TARGETS entrypoint
extension/aten_util/TARGETS	Delete TARGETS entrypoint
exir/emit/TARGETS	Delete TARGETS build rules
exir/emit/BUCK	Promote TARGETS rules into BUCK
examples/qualcomm/executor_runner/TARGETS	Delete TARGETS entrypoint
examples/models/llama/experimental/TARGETS	Delete TARGETS entrypoint
examples/models/llama/experimental/BUCK	Add BUCK entrypoint wrapper
devtools/etdump/data_sinks/tests/TARGETS	Delete TARGETS entrypoint
devtools/etdump/data_sinks/tests/BUCK	Add BUCK entrypoint wrapper
devtools/bundled_program/TARGETS	Delete TARGETS build rules
devtools/bundled_program/schema/TARGETS	Delete TARGETS build rules
devtools/bundled_program/schema/BUCK	Promote TARGETS rules into BUCK
devtools/bundled_program/BUCK	Promote TARGETS rules into BUCK
codegen/tools/TARGETS	Delete TARGETS entrypoint
codegen/tools/BUCK	Use is_fbcode() in BUCK
codegen/test/TARGETS	Delete TARGETS entrypoint
backends/xnnpack/serialization/TARGETS	Delete TARGETS build rules
backends/xnnpack/serialization/BUCK	Promote TARGETS rules into BUCK
backends/vulkan/test/op_tests/TARGETS	Delete TARGETS entrypoint
backends/vulkan/test/op_tests/BUCK	Use is_fbcode() in BUCK
backends/vulkan/test/custom_ops/TARGETS	Delete TARGETS entrypoint
backends/vulkan/test/custom_ops/BUCK	Use is_fbcode() in BUCK
backends/qualcomm/partition/TARGETS	Delete TARGETS entrypoint
backends/qualcomm/partition/BUCK	Add BUCK entrypoint wrapper
backends/apple/mps/TARGETS	Delete TARGETS build rules
backends/apple/mps/BUCK	Promote TARGETS rules into BUCK
backends/aoti/slim/util/test/BUCK	Add BUCK entrypoint wrapper
backends/aoti/slim/util/BUCK	Add BUCK entrypoint wrapper
backends/aoti/slim/c10/core/BUCK	Add BUCK entrypoint wrapper
backends/aoti/BUCK	Add BUCK entrypoint wrapper

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