Build/test //kernels/portable/cpu/... in unittest-buck (#9041)

Just needed to get ATen-mode ops out of the OSS build.

Differential Revision: D70791340

Author: swolchok

.ci/scripts/unittest-buck2.sh

@@ -20,5 +20,5 @@ buck2 query "//backends/apple/... + //backends/example/... + \
 # TODO: expand the covered scope of Buck targets.
 # //runtime/kernel/... is failing because //third-party:torchgen_files's shell script can't find python on PATH.
 # //runtime/test/... requires Python torch, which we don't have in our OSS buck setup.
-buck2 build //runtime/backend/... //runtime/core/... //runtime/executor: //runtime/kernel/... //runtime/platform/...
-buck2 test //runtime/backend/... //runtime/core/... //runtime/executor: //runtime/kernel/... //runtime/platform/...
+buck2 test //kernels/portable/cpu/... //runtime/backend/... //runtime/core/... \
+      //runtime/executor: //runtime/kernel/... //runtime/platform/...

kernels/portable/cpu/targets.bzl

@@ -1,4 +1,4 @@
-load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "runtime")
+load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "get_aten_mode_options", "runtime")
 load("@fbsource//xplat/executorch/kernels/portable:op_registration_util.bzl", "ATEN_OPS", "CUSTOM_OPS", "define_op_target")
 
 def define_common_targets():
@@ -29,12 +29,13 @@ def define_common_targets():
         exported_deps = all_op_targets,
     )
 
-    runtime.cxx_library(
-        name = "cpu_aten",
-        srcs = [],
-        visibility = ["//executorch/kernels/portable/..."],
-        exported_deps = [t + "_aten" for t in custom_op_targets],
-    )
+    if True in get_aten_mode_options():
+        runtime.cxx_library(
+            name = "cpu_aten",
+            srcs = [],
+            visibility = ["//executorch/kernels/portable/..."],
+            exported_deps = [t + "_aten" for t in custom_op_targets],
+        )
 
     # Only for use by op targets under //executorch. This API needs to be
     # reevaluated before becoming a public API.

shim_et/xplat/executorch/kernels/portable/op_registration_util.bzl

@@ -1,4 +1,4 @@
-load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "is_xplat", "runtime")
+load("@fbsource//xplat/executorch/build:runtime_wrapper.bzl", "get_aten_mode_options", "is_xplat", "runtime")
 load("@fbsource//xplat/executorch/build:selects.bzl", "selects")
 
 def get_compiler_optimization_flags():
@@ -170,7 +170,7 @@ def define_op_target(name, deps, android_deps, is_aten_op, is_et_op = True, _all
 
     # If this is a custom op, define a target that builds it with at::Tensor
     # so that it can be imported into a host PyTorch environment for authoring.
-    if not is_aten_op:
+    if not is_aten_op and True in get_aten_mode_options():
         define_op_library(
             name = name,
             deps = _aten_mode_deps if _aten_mode_deps else deps,