[NFC] Expose a number of BUILD differences between Google and OSS through copybara:comment directives.

PiperOrigin-RevId: 352646325
Change-Id: I1d8923a574cdccb58dbc4d38d7d0aadb3171f5e7

tensorflow/BUILD

@@ -833,12 +833,12 @@ tf_cc_shared_object(
     per_os_targets = True,
     soversion = VERSION,
     visibility = ["//visibility:public"],
-    # add win_def_file for tensorflow
+    # copybara:comment_begin(OSS Windows only: DEF file for exported symbols)
     win_def_file = select({
-        # We need this DEF file to properly export symbols on Windows
         "//tensorflow:windows": ":tensorflow_filtered_def_file",
         "//conditions:default": None,
     }),
+    # copybara:comment_end
     deps = [
         "//tensorflow/c:c_api",
         "//tensorflow/c:c_api_experimental",
@@ -866,12 +866,12 @@ tf_cc_shared_object(
     per_os_targets = True,
     soversion = VERSION,
     visibility = ["//visibility:public"],
-    # add win_def_file for tensorflow_cc
+    # copybara:comment_begin(OSS Windows only: DEF file for exported symbols)
     win_def_file = select({
-        # We need this DEF file to properly export symbols on Windows
         "//tensorflow:windows": ":tensorflow_filtered_def_file",
         "//conditions:default": None,
     }),
+    # copybara:comment_end
     deps = [
         "//tensorflow:tf_exported_symbols.lds",
         "//tensorflow:tf_version_script.lds",

tensorflow/core/BUILD

@@ -525,9 +525,12 @@ cc_library(
     ],
     visibility = ["//visibility:public"],
     deps =
+        # copybara:uncomment_begin
+        # if_mobile(["@nsync//:nsync_cpp"]) +
+        # copybara:uncomment_end_uncomment_begin
+        # ["@nsync//:nsync_cpp"] +
+        # copybara:comment_end
         [
-            "@nsync//:nsync_cpp",
-        ] + [
             "//third_party/eigen3",
             "//tensorflow/core/platform:dynamic_annotations",
             "//tensorflow/core/platform:platform_port",

tensorflow/java/src/gen/gen_ops.bzl

@@ -54,6 +54,10 @@ def tf_java_op_gen_srcjar(
         srcs = srcs,
         outs = [gen_srcjar],
         tools = [
+            # copybara:uncomment_begin(using system-provided in OSS build)
+            # "//third_party/java/jdk/jar:jar",
+            # "//third_party/java/jdk:jdk",
+            # copybara:uncomment_end
             gen_tool,
         ] + tf_binary_additional_srcs(),
         toolchains = ["@bazel_tools//tools/jdk:current_host_java_runtime"],

tensorflow/lite/testing/BUILD

@@ -42,9 +42,17 @@ exports_files([
         ),
     },
     conversion_mode = conversion_mode,
-    data = [
-        ":zip_%s" % test_name,
-    ],
+    # copybara:uncomment_begin(no special handling for Android in OSS)
+    # data = select({
+    # "//tensorflow:android": [],
+    # "//conditions:default": [
+    # ":zip_%s" % test_name,
+    # "//third_party/unzip",
+    # ],
+    # }),
+    # copybara:uncomment_end_and_comment_begin
+    data = [":zip_%s" % test_name],
+    # copybara:comment_end
     shard_count = 20,
     test_args = args + select({
         "//tensorflow:android": [],

tensorflow/python/BUILD

@@ -5196,11 +5196,12 @@ py_library(
 pywrap_tensorflow_macro(
     name = "pywrap_tensorflow_internal",
     srcs = ["pywrap_tensorflow_internal.cc"],
-    # add win_def_file for pywrap_tensorflow
+    # copybara:comment_begin(OSS Windows only: DEF file for exported symbols)
     win_def_file = select({
         "//tensorflow:windows": ":pywrap_tensorflow_filtered_def_file",
         "//conditions:default": None,
     }),
+    # copybara:comment_end
     deps = [
         ":bfloat16_lib",
         ":cost_analyzer_lib",

tensorflow/python/tools/api/generator/api_gen.bzl

@@ -124,7 +124,12 @@ def gen_api_init_files(
             " --compat_init_template=$(location %s)" % compat_init_template
         )
 
+    # copybara:uncomment_begin(configurable API loading)
+    # native.vardef("TF_API_INIT_LOADING", "default")
+    # loading_flag = " --loading=$(TF_API_INIT_LOADING)"
+    # copybara:uncomment_end_and_comment_begin
     loading_flag = " --loading=default"
+    # copybara:comment_end
 
     native.genrule(
         name = name,

tensorflow/tensorflow.bzl

@@ -77,8 +77,20 @@ def if_nvcc(a):
         "//conditions:default": [],
     })
 
+# In Google builds, this corresponds to whether `--config=cuda` has been
+# specified. In OSS, this corresponds to whether the environment contains
+# TF_NEED_CUDA=1, which is in turn triggered by --config=using_cuda through
+# .bazelrc, which is again triggered by --config=cuda.
+#
+# In other words, --config=cuda is sufficient for this function to return
+# x both for Google and OSS builds. But for OSS builds it is not necessary.
+# We are working on a plan to clean up this complicated setup.
 def if_cuda_is_configured_compat(x):
+    # copybara:uncomment_begin(--config=cuda is necessary and sufficient)
+    # return if_cuda(x)
+    # copybara:uncomment_end_and_comment_begin
     return if_cuda_is_configured(x)
+    # copybara:comment_end
 
 def if_xla_available(if_true, if_false = []):
     return select({
@@ -1686,7 +1698,7 @@ def cc_header_only_library(name, deps = [], includes = [], extra_deps = [], comp
 
 def tf_custom_op_library_additional_deps():
     return [
-        "@com_google_protobuf//:protobuf_headers",
+        "@com_google_protobuf//:protobuf_headers",  # copybara:comment
         clean_dep("//third_party/eigen3"),
         clean_dep("//tensorflow/core:framework_headers_lib"),
     ] + if_windows([clean_dep("//tensorflow/python:pywrap_tensorflow_import_lib")])
@@ -1696,10 +1708,14 @@ def tf_custom_op_library_additional_deps():
 # exporting symbols from _pywrap_tensorflow.dll on Windows.
 def tf_custom_op_library_additional_deps_impl():
     return [
+        # copybara:comment_begin
         "@com_google_protobuf//:protobuf",
         "@nsync//:nsync_cpp",
+        # copybara:comment_end
+
         # for //third_party/eigen3
         clean_dep("//third_party/eigen3"),
+
         # for //tensorflow/core:framework_headers_lib
         clean_dep("//tensorflow/core:framework"),
         clean_dep("//tensorflow/core:reader_base"),