Do not depend on boringssl for big-endian architectures. (#20038)

* Do not depend on boringssl for big-endian architectures.

A recent commit migrated TensorFlow from grpc_unsecure (and grpc++_unsecure)
to their secure variants. These secure variants depend on BoringSSL.
Unfortunately, BoringSSL does not work on big-endian architectures.

This commit abstracts the grpc dependency behind a couple cc_library rules,
and plumbs through the logic to conditionally build without BoringSSL based
on the target architecture.

Fixes #20014

* Fix BUILD file formatting.

* Fix typo in CPU name

* Add an additional bind and select when evaluating the cc_proto_library rules.

1 files changed, 22 insertions, 0 deletions

diff --git a/tensorflow/BUILD b/tensorflow/BUILD
index d77f04139e..4e212e96dc 100644
--- a/tensorflow/BUILD
+++ b/tensorflow/BUILD
@@ -155,6 +155,12 @@ config_setting(
 )
 
 config_setting(
+    name = "linux_s390x",
+    values = {"cpu": "s390x"},
+    visibility = ["//visibility:public"],
+)
+
+config_setting(
     name = "debug",
     values = {
         "compilation_mode": "dbg",
@@ -424,6 +430,22 @@ filegroup(
     data = glob(["docs_src/**/*.md"]),
 )
 
+cc_library(
+    name = "grpc",
+    deps = select({
+        ":linux_s390x": ["@grpc//:grpc_unsecure"],
+        "//conditions:default": ["@grpc"],
+    }),
+)
+
+cc_library(
+    name = "grpc++",
+    deps = select({
+        ":linux_s390x": ["@grpc//:grpc++_unsecure"],
+        "//conditions:default": ["@grpc//:grpc++"],
+    }),
+)
+
 # A shared object which includes registration mechanisms for ops and
 # kernels. Does not include the implementations of any ops or kernels. Instead,
 # the library which loads libtensorflow_framework.so