Use new apple_support toolchain on macOS (bazelbuild#1005)

.bazelrc

@@ -4,14 +4,26 @@ common --incompatible_allow_tags_propagation
 # Fail if a glob doesn't match anything (https://github.com/bazelbuild/bazel/issues/8195)
 build --incompatible_disallow_empty_glob
 
-# Since there's no way to set the deployment version for swift_{binary,test},
-# this forces all targets' minimum macOS to Catalina until Bazel CI has
-# upgraded their Mac machines to Big Sur.
-build --macos_minimum_os=10.15
+build --macos_minimum_os=11.0
 
 # Make sure no warnings slip into the C++ tools we vendor
 build --features treat_warnings_as_errors
 
 # The default strategy is worker, which has sandboxing disabled by default,
 # which can hide issues with non-hermetic bugs.
 build --worker_sandboxing
+
+build --enable_platform_specific_config
+build:macos --apple_crosstool_top=@local_config_apple_cc//:toolchain
+build:macos --crosstool_top=@local_config_apple_cc//:toolchain
+build:macos --host_crosstool_top=@local_config_apple_cc//:toolchain
+
+# TODO: Remove once https://github.com/protocolbuffers/protobuf/commit/7bb756c1cc580380c689a9141b27e20c7a5d95f3 is in a release
+build --per_file_copt="external/.*protobuf.*/src/google/protobuf/stubs/strutil.cc@-Wno-deprecated-declarations"
+# TODO: Use --host_per_file_copt here once we drop bazel 5.x
+build --host_cxxopt="-Wno-deprecated-declarations"
+
+# TODO: Remove once https://github.com/protocolbuffers/protobuf/commit/85225b83c3386a282bf1e51f1be8bd2ad0bc45d0 is in a release
+build --per_file_copt="external/.*protobuf.*/.*.cc@-Wno-unused-function"
+# TODO: Use --host_per_file_copt here once we drop bazel 5.x
+build --host_cxxopt="-Wno-unused-function"

MODULE.bazel

@@ -31,5 +31,8 @@ use_repo(
     "com_github_grpc_grpc_swift",
 )
 
+apple_cc_configure = use_extension("@build_bazel_apple_support//crosstool:setup.bzl", "apple_cc_configure_extension")
+use_repo(apple_cc_configure, "local_config_apple_cc")
+
 # Dev dependencies
 bazel_dep(name = "stardoc", version = "0.5.3", dev_dependency = True, repo_name = "io_bazel_stardoc")

test/rules/action_command_line_test.bzl

@@ -53,6 +53,7 @@ def _action_command_line_test_impl(ctx):
                 if action.argv[0] not in [
                     "/usr/bin/ar",
                     "external/local_config_cc/libtool",
+                    "external/local_config_apple_cc/libtool",
                 ]
             ]
         if len(matching_actions) != 1: