commit bb0d04663c7dc6c0096f8717cb4ec26330a5ae40
Author: Yun Peng <pcloudy@google.com>
Date:   Wed Jun 3 15:35:31 2020 +0200

    Patch grpc v1.26.0 for Bazel build
    
    - Avoid loading dependencies that're not needed for the gRPC C++
    libraries
    - Add bazel mirror URL for upb and cares
    - Redirect zlib to @//third_party/zlib
    - Add darwin_arm64 and darwin_arm64e config settings to allow
    building for Apple Silicon

diff --git a/bazel/grpc_build_system.bzl b/bazel/grpc_build_system.bzl
index 7bb6b8bdb9..7644107b70 100644
--- a/bazel/grpc_build_system.bzl
+++ b/bazel/grpc_build_system.bzl
@@ -25,7 +25,7 @@
 
 load("//bazel:cc_grpc_library.bzl", "cc_grpc_library")
 load("@upb//bazel:upb_proto_library.bzl", "upb_proto_library")
-load("@build_bazel_rules_apple//apple:ios.bzl", "ios_unit_test")
+# load("@build_bazel_rules_apple//apple:ios.bzl", "ios_unit_test")
 
 # The set of pollers to test against if a test exercises polling
 POLLERS = ["epollex", "epoll1", "poll"]
@@ -181,13 +181,13 @@ def ios_cc_test(
             testonly = 1,
         )
         ios_test_deps = [ios_test_adapter, ":" + test_lib_ios]
-        ios_unit_test(
-            name = name + "_on_ios",
-            size = kwargs.get("size"),
-            tags = ios_tags,
-            minimum_os_version = "9.0",
-            deps = ios_test_deps,
-        )
+        # ios_unit_test(
+        #     name = name + "_on_ios",
+        #     size = kwargs.get("size"),
+        #     tags = ios_tags,
+        #     minimum_os_version = "9.0",
+        #     deps = ios_test_deps,
+        # )
 
 def grpc_cc_test(name, srcs = [], deps = [], external_deps = [], args = [], data = [], uses_polling = True, language = "C++", size = "medium", timeout = None, tags = [], exec_compatible_with = [], exec_properties = {}, shard_count = None, flaky = None):
     copts = if_mac(["-DGRPC_CFSTREAM"])
diff --git a/bazel/grpc_deps.bzl b/bazel/grpc_deps.bzl
index 09fcad95a2..9b737e5deb 100644
--- a/bazel/grpc_deps.bzl
+++ b/bazel/grpc_deps.bzl
@@ -33,7 +33,7 @@ def grpc_deps():
 
     native.bind(
         name = "madler_zlib",
-        actual = "@zlib//:zlib",
+        actual = "@//third_party/zlib",
     )
 
     native.bind(
diff --git a/bazel/grpc_extra_deps.bzl b/bazel/grpc_extra_deps.bzl
index 4c1dfad2e8..f63c54ddef 100644
--- a/bazel/grpc_extra_deps.bzl
+++ b/bazel/grpc_extra_deps.bzl
@@ -1,11 +1,6 @@
 """Loads the dependencies necessary for the external repositories defined in grpc_deps.bzl."""
 
-load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
 load("@upb//bazel:workspace_deps.bzl", "upb_deps")
-load("@envoy_api//bazel:repositories.bzl", "api_dependencies")
-load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
-load("@build_bazel_rules_apple//apple:repositories.bzl", "apple_rules_dependencies")
-load("@build_bazel_apple_support//lib:repositories.bzl", "apple_support_dependencies")
 
 def grpc_extra_deps():
     """Loads the extra dependencies.
@@ -26,15 +21,5 @@ def grpc_extra_deps():
     grpc_extra_deps()
     ```
     """
-    protobuf_deps()
-
     upb_deps()
 
-    api_dependencies()
-
-    go_rules_dependencies()
-    go_register_toolchains()
-
-    apple_rules_dependencies()
-
-    apple_support_dependencies()
diff --git a/third_party/cares/cares.BUILD b/third_party/cares/cares.BUILD
index c047f0c515..7c24fbc617 100644
--- a/third_party/cares/cares.BUILD
+++ b/third_party/cares/cares.BUILD
@@ -10,6 +10,16 @@ config_setting(
     values = {"cpu": "darwin_x86_64"},
 )
 
+config_setting(
+    name = "darwin_arm64",
+    values = {"cpu": "darwin_arm64"},
+)
+
+config_setting(
+    name = "darwin_arm64e",
+    values = {"cpu": "darwin_arm64e"},
+)
+
 config_setting(
     name = "windows",
     values = {"cpu": "x64_windows"},
@@ -99,6 +109,8 @@ copy_file(
         ":watchos_arm64_32": "@com_github_grpc_grpc//third_party/cares:config_darwin/ares_config.h",
         ":darwin": "@com_github_grpc_grpc//third_party/cares:config_darwin/ares_config.h",
         ":darwin_x86_64": "@com_github_grpc_grpc//third_party/cares:config_darwin/ares_config.h",
+        ":darwin_arm64": "@com_github_grpc_grpc//third_party/cares:config_darwin/ares_config.h",
+        ":darwin_arm64e": "@com_github_grpc_grpc//third_party/cares:config_darwin/ares_config.h",
         ":windows": "@com_github_grpc_grpc//third_party/cares:config_windows/ares_config.h",
         ":android": "@com_github_grpc_grpc//third_party/cares:config_android/ares_config.h",
         "//conditions:default": "@com_github_grpc_grpc//third_party/cares:config_linux/ares_config.h",