Add new darwin CC toolchain for tests

Bazel 7.x is going to remove the CC toolchain that supports iOS and use
the unix toolchain for macOS support. Since there are some tests that
use the iOS toolchain we need to set that up for testing.

examples/.bazelrc

@@ -1,8 +1,13 @@
-
 # Required for Windows
 build --enable_runfiles
 
 # These are required otherwise paths are too long
 startup --windows_enable_symlinks
 build --action_env=MSYS=winsymlinks:nativestrict
 test --action_env=MSYS=winsymlinks:nativestrict
+
+# Enable CC toolchain that supports iOS from https://github.com/bazelbuild/apple_support
+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

examples/WORKSPACE.bazel

@@ -57,6 +57,13 @@ rbe_preconfig(
     toolchain = "ubuntu1804-bazel-java11",
 )
 
+http_archive(
+    name = "build_bazel_apple_support",
+    patches = ["//deps:apple_support.patch"],
+    sha256 = "77a121a0f5d4cd88824429464ad2bfb54bdc8a3bccdb4d31a6c846003a3f5e44",
+    url = "https://github.com/bazelbuild/apple_support/releases/download/1.4.1/apple_support.1.4.1.tar.gz",
+)
+
 http_archive(
     name = "build_bazel_rules_apple",
     sha256 = "12865e5944f09d16364aa78050366aca9dc35a32a018fa35f5950238b08bf744",

examples/deps/apple_support.patch

@@ -0,0 +1,8 @@
+--- crosstool/setup.bzl
++++ crosstool/setup.bzl
+@@ -66,5 +66,3 @@ def apple_cc_configure():
+ def _apple_cc_configure_extension_impl(_):
+     _apple_cc_autoconf_toolchains(name = "local_config_apple_cc_toolchains")
+     _apple_cc_autoconf(name = "local_config_apple_cc")
+-
+-apple_cc_configure_extension = module_extension(implementation = _apple_cc_configure_extension_impl)