Add native support for Apple Silicon

After this PR, we can use a x86 version of Bazel to build an ARM64 Bazel binary for Apple Silicon by
```
bazel build --cpu=darwin_arm64 //src:bazel
```
The Bazel client, embedded tools and embedded JDK are all native ARM64 binaries.

Changes in this PR:
1. Add OpenJDK definitions for ARM64 macOS
2. Manually created the embedded JDK binaries on an Apple Silicon machine and uploaded them to the bazel mirror site.
3. AutoCpuConverter.java: identify the cpu value correctly
4. cc_toolchain_config.bzl: Explicitly specify the target platform also in the x86 cc toolchain, so that we can also do cross-platform compile from ARM64 to x86.

With the native arm64 Bazel binary, building Bazel itself takes only half of the time compared with the x86 Bazel binary on an Apple DTK machine:
```
$ bazel build --cpu=darwin_arm64 --disk_cache= --repository_cache= //src:bazel
Starting local Bazel server and connecting to it...
...
Target //src:bazel up-to-date:
  bazel-bin/src/bazel
INFO: Elapsed time: 1044.462s, Critical Path: 180.08s
INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker.
INFO: Build completed successfully, 2984 total actions

cp  ./bazel-bin/src/bazel ~/bin/bazel-arm64

$ bazel-arm64 clean --expunge

$ bazel-arm64 build --disk_cache= --repository_cache= //src:bazel
Starting local Bazel server and connecting to it...
...
Target //src:bazel up-to-date:
  bazel-bin/src/bazel
INFO: Elapsed time: 464.470s, Critical Path: 114.88s
INFO: 2984 processes: 179 internal, 2092 darwin-sandbox, 1 local, 712 worker.
INFO: Build completed successfully, 2984 total actions

```

Closes: #11628

Closes #12900.

PiperOrigin-RevId: 354058336

Revert default cpu value on x86 macOS to "darwin"

Many downstream projects are still depending on the default cpu value
on x86 macOS being "darwin" instead of "darwin_x86_64"

https://buildkite.com/bazel/bazel-auto-sheriff-face-with-cowboy-hat/builds/412

Related: #11628

Closes #12918.

PiperOrigin-RevId: 354279409

WORKSPACE

@@ -409,6 +409,30 @@ http_file(
     urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64-minimal-b23d4e05466f2aa1fdcd72d3d3a8e962206b64bf-1581689063.tar.gz"],
 )
 
+http_file(
+    name = "openjdk_macos_aarch64",
+    downloaded_file_path = "zulu-macos-aarch64.tar.gz",
+    sha256 = "a900ef793cb34b03ac5d93ea2f67291b6842e99d500934e19393a8d8f9bfa6ff",
+    urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.45.27-ca-jdk11.0.10/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64-allmodules-1611665569.tar.gz"],
+)
+
+http_file(
+    name = "openjdk_macos_aarch64_vanilla",
+    downloaded_file_path = "zulu-macos-aarch64-vanilla.tar.gz",
+    sha256 = "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+    ],
+)
+
+http_file(
+    name = "openjdk_macos_aarch64_minimal",
+    downloaded_file_path = "zulu-macos-aarch64-minimal.tar.gz",
+    sha256 = "f4f606926e6deeaa8b8397e299313d9df87642fe464b0ccf1ed0432aeb00640b",
+    urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.45.27-ca-jdk11.0.10/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64-minimal-1611665562.tar.gz"],
+)
+
 http_file(
     name = "openjdk_win",
     downloaded_file_path = "zulu-win.zip",
@@ -552,6 +576,7 @@ distdir_tar(
         "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz",
         "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz",
         "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz",
+        "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
         "zulu11.37.17-ca-jdk11.0.6-win_x64.zip",
         "android_tools_pkg-0.19.0rc3.tar.gz",
         # bazelbuild/bazel-skylib
@@ -586,6 +611,7 @@ distdir_tar(
         "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz": "360626cc19063bc411bfed2914301b908a8f77a7919aaea007a977fa8fb3cde1",
         "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz": "a452f1b9682d9f83c1c14e54d1446e1c51b5173a3a05dcb013d380f9508562e4",
         "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz": "e1fe56769f32e2aaac95e0a8f86b5a323da5af3a3b4bba73f3086391a6cc056f",
+        "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz": "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
         "zulu11.37.17-ca-jdk11.0.6-win_x64.zip": "a9695617b8374bfa171f166951214965b1d1d08f43218db9a2a780b71c665c18",
         "android_tools_pkg-0.19.0rc3.tar.gz": "ea5c0589a01e2a9f43c20e5c145d3530e3b3bdbe7322789bc5da38d0ca49b837",
         # bazelbuild/bazel-skylib
@@ -619,6 +645,7 @@ distdir_tar(
         "zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz": ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-linux_x64.tar.gz"],
         "zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz": ["https://mirror.bazel.build/openjdk/azul-zulu11.37.48-ca-jdk11.0.6/zulu11.37.48-ca-jdk11.0.6-linux_aarch64.tar.gz"],
         "zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz": ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"],
+        "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz": ["https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz"],
         "zulu11.37.17-ca-jdk11.0.6-win_x64.zip": ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"],
         "android_tools_pkg-0.19.0rc3.tar.gz": [
             "https://mirror.bazel.build/bazel_android_tools/android_tools_pkg-0.19.0rc3.tar.gz",
@@ -827,6 +854,20 @@ http_archive(
     urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"],
 )
 
+# This must be kept in sync with src/main/java/com/google/devtools/build/lib/bazel/rules/java/jdk.WORKSPACE.
+http_archive(
+    name = "remotejdk11_macos_aarch64_for_testing",
+    build_file = "@local_jdk//:BUILD.bazel",
+    patch_cmds = EXPORT_WORKSPACE_IN_BUILD_BAZEL_FILE,
+    patch_cmds_win = EXPORT_WORKSPACE_IN_BUILD_BAZEL_FILE_WIN,
+    sha256 = "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
+    strip_prefix = "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with src/main/java/com/google/devtools/build/lib/bazel/rules/java/jdk.WORKSPACE.
 http_archive(
     name = "remotejdk11_win_for_testing",
@@ -899,6 +940,20 @@ http_archive(
     ],
 )
 
+# This must be kept in sync with src/main/java/com/google/devtools/build/lib/bazel/rules/java/jdk.WORKSPACE.
+http_archive(
+    name = "remotejdk15_macos_aarch64_for_testing",
+    build_file = "@local_jdk//:BUILD.bazel",
+    patch_cmds = EXPORT_WORKSPACE_IN_BUILD_BAZEL_FILE,
+    patch_cmds_win = EXPORT_WORKSPACE_IN_BUILD_BAZEL_FILE_WIN,
+    sha256 = "2613c3f15eef6b6ecd0fd102da92282b985e4573905dc902f1783d8059c1efc5",
+    strip_prefix = "zulu15.29.15-ca-jdk15.0.2-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with src/main/java/com/google/devtools/build/lib/bazel/rules/java/jdk.WORKSPACE.
 http_archive(
     name = "remotejdk15_win_for_testing",
@@ -1006,6 +1061,21 @@ exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
     urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"],
 )
 
+# This must be kept in sync with src/test/shell/bazel/testdata/jdk_http_archives.
+http_archive(
+    name = "openjdk11_darwin_aarch64_archive",
+    build_file_content = """
+java_runtime(name = 'runtime', srcs =  glob(['**']), visibility = ['//visibility:public'])
+exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
+""",
+    sha256 = "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
+    strip_prefix = "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with src/test/shell/bazel/testdata/jdk_http_archives.
 http_archive(
     name = "openjdk11_windows_archive",
@@ -1084,6 +1154,21 @@ exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
     ],
 )
 
+# This must be kept in sync with src/test/shell/bazel/testdata/jdk_http_archives.
+http_archive(
+    name = "openjdk15_darwin_aarch64_archive",
+    build_file_content = """
+java_runtime(name = 'runtime', srcs =  glob(['**']), visibility = ['//visibility:public'])
+exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
+""",
+    sha256 = "2613c3f15eef6b6ecd0fd102da92282b985e4573905dc902f1783d8059c1efc5",
+    strip_prefix = "zulu15.29.15-ca-jdk15.0.2-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with src/test/shell/bazel/testdata/jdk_http_archives.
 http_archive(
     name = "openjdk15_windows_archive",

src/BUILD

@@ -178,6 +178,9 @@ filegroup(
         "//src/conditions:darwin": [
             "@openjdk_macos//file",
         ],
+        "//src/conditions:darwin_arm64": [
+            "@openjdk_macos_aarch64//file",
+        ],
         "//src/conditions:windows": [
             "@openjdk_win//file",
         ],
@@ -197,6 +200,9 @@ filegroup(
         "//src/conditions:darwin": [
             "@openjdk_macos_minimal//file",
         ],
+        "//src/conditions:darwin_arm64": [
+            "@openjdk_macos_aarch64_minimal//file",
+        ],
         "//src/conditions:windows": [
             "@openjdk_win_minimal//file",
         ],
@@ -216,6 +222,9 @@ filegroup(
         "//src/conditions:darwin": [
             "@openjdk_macos_vanilla//file",
         ],
+        "//src/conditions:darwin_arm64": [
+            "@openjdk_macos_aarch64_vanilla//file",
+        ],
         "//src/conditions:windows": [
             "@openjdk_win_vanilla//file",
         ],
@@ -749,18 +758,21 @@ filegroup(
         "@bazel_skylib//:WORKSPACE",
         "@bazel_toolchains//:WORKSPACE",
         "@com_google_protobuf//:WORKSPACE",
+        "@openjdk11_darwin_aarch64_archive//:WORKSPACE",
         "@openjdk11_darwin_archive//:WORKSPACE",
         "@openjdk11_linux_archive//:WORKSPACE",
         "@openjdk11_windows_archive//:WORKSPACE",
         "@openjdk14_darwin_archive//:WORKSPACE",
         "@openjdk14_linux_archive//:WORKSPACE",
         "@openjdk14_windows_archive//:WORKSPACE",
+        "@openjdk15_darwin_aarch64_archive//:WORKSPACE",
         "@openjdk15_darwin_archive//:WORKSPACE",
         "@openjdk15_linux_archive//:WORKSPACE",
         "@openjdk15_windows_archive//:WORKSPACE",
         "@openjdk_linux_aarch64_minimal//file",
         "@openjdk_linux_minimal//file",
         "@openjdk_macos_minimal//file",
+        "@openjdk_macos_aarch64_minimal//file",
         "@openjdk_win_minimal//file",
         "@remote_coverage_tools_for_testing//:WORKSPACE",
         "@remote_java_tools_darwin_for_testing//:WORKSPACE",
@@ -773,12 +785,14 @@ filegroup(
         "@remotejdk11_linux_for_testing//:WORKSPACE",
         "@remotejdk11_linux_ppc64le_for_testing//:WORKSPACE",
         "@remotejdk11_linux_s390x_for_testing//:WORKSPACE",
+        "@remotejdk11_macos_aarch64_for_testing//:WORKSPACE",
         "@remotejdk11_macos_for_testing//:WORKSPACE",
         "@remotejdk11_win_for_testing//:WORKSPACE",
         "@remotejdk14_linux_for_testing//:WORKSPACE",
         "@remotejdk14_macos_for_testing//:WORKSPACE",
         "@remotejdk14_win_for_testing//:WORKSPACE",
         "@remotejdk15_linux_for_testing//:WORKSPACE",
+        "@remotejdk15_macos_aarch64_for_testing//:WORKSPACE",
         "@remotejdk15_macos_for_testing//:WORKSPACE",
         "@remotejdk15_win_for_testing//:WORKSPACE",
         "@rules_cc//:WORKSPACE",

src/main/java/com/google/devtools/build/lib/analysis/config/AutoCpuConverter.java

@@ -34,7 +34,14 @@ public String convert(String input) throws OptionsParsingException {
       // linux-x86_64, darwin includes the CPU architecture, ...).
       switch (OS.getCurrent()) {
         case DARWIN:
-          return "darwin";
+          switch (CPU.getCurrent()) {
+            case X86_64:
+              return "darwin";
+            case AARCH64:
+              return "darwin_arm64";
+            default:
+              return "unknown";
+          }
         case FREEBSD:
           return "freebsd";
         case OPENBSD:

src/main/java/com/google/devtools/build/lib/bazel/rules/java/jdk.WORKSPACE

@@ -76,6 +76,19 @@ maybe(
     ],
 )
 
+# This must be kept in sync with the top-level WORKSPACE file.
+maybe(
+    http_archive,
+    name = "remotejdk11_macos_aarch64",
+    build_file = "@bazel_tools//tools/jdk:jdk.BUILD",
+    sha256 = "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
+    strip_prefix = "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with the top-level WORKSPACE file.
 maybe(
     http_archive,
@@ -146,6 +159,19 @@ maybe(
     ],
 )
 
+# This must be kept in sync with the top-level WORKSPACE file.
+maybe(
+    http_archive,
+    name = "remotejdk15_macos_aarch64",
+    build_file = "@bazel_tools//tools/jdk:jdk.BUILD",
+    strip_prefix = "zulu15.29.15-ca-jdk15.0.2-macosx_aarch64",
+    sha256 = "2613c3f15eef6b6ecd0fd102da92282b985e4573905dc902f1783d8059c1efc5",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+    ],
+)
+
 # This must be kept in sync with the top-level WORKSPACE file.
 maybe(
     http_archive,

src/test/py/bazel/test_base.py

@@ -62,12 +62,14 @@ class TestBase(unittest.TestCase):
       'remotejdk11_linux_ppc64le_for_testing',
       'remotejdk11_linux_s390x_for_testing',
       'remotejdk11_macos_for_testing',
+      'remotejdk11_macos_aarch64_for_testing',
       'remotejdk11_win_for_testing',
       'remotejdk14_linux_for_testing',
       'remotejdk14_macos_for_testing',
       'remotejdk14_win_for_testing',
       'remotejdk15_linux_for_testing',
       'remotejdk15_macos_for_testing',
+      'remotejdk15_macos_aarch64_for_testing',
       'remotejdk15_win_for_testing',
       'remote_java_tools_darwin_for_testing',
       'remote_java_tools_linux_for_testing',

src/test/shell/bazel/testdata/jdk_http_archives

@@ -1,3 +1,4 @@
+
 ################### Remote java_tools with embedded javac 11 ###################
 # This must be kept in sync with the top-level WORKSPACE file.
 http_archive(
@@ -42,6 +43,17 @@ http_archive(
     urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-macosx_x64.tar.gz"],
 )
 # This must be kept in sync with the top-level WORKSPACE file.
+http_archive(
+    name = "openjdk11_darwin_aarch64_archive",
+    build_file_content = "java_runtime(name = 'runtime', srcs =  glob(['**']), visibility = ['//visibility:public'])",
+    sha256 = "3dcc636e64ae58b922269c2dc9f20f6f967bee90e3f6847d643c4a566f1e8d8a",
+    strip_prefix = "zulu11.45.27-ca-jdk11.0.10-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu11.45.27-ca-jdk11.0.10-macosx_aarch64.tar.gz",
+    ],
+)
+# This must be kept in sync with the top-level WORKSPACE file.
 http_archive(
     name = "openjdk11_windows_archive",
     build_file_content = "java_runtime(name = 'runtime', srcs =  glob(['**']), visibility = ['//visibility:public'])",
@@ -106,6 +118,20 @@ exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
     ],
 )
 # This must be kept in sync with the top-level WORKSPACE file.
+http_archive(
+    name = "openjdk15_darwin_aarch64_archive",
+    build_file_content = """
+java_runtime(name = 'runtime', srcs =  glob(['**']), visibility = ['//visibility:public'])
+exports_files(["WORKSPACE"], visibility = ["//visibility:public"])
+""",
+    sha256 = "2613c3f15eef6b6ecd0fd102da92282b985e4573905dc902f1783d8059c1efc5",
+    strip_prefix = "zulu15.29.15-ca-jdk15.0.2-macosx_aarch64",
+    urls = [
+        "https://mirror.bazel.build/cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+        "https://cdn.azul.com/zulu/bin/zulu15.29.15-ca-jdk15.0.2-macosx_aarch64.tar.gz",
+    ],
+)
+# This must be kept in sync with the top-level WORKSPACE file.
 http_archive(
     name = "openjdk15_windows_archive",
     build_file_content = """

src/test/shell/testenv.sh

@@ -284,17 +284,20 @@ EOF
         "bazel_toolchains"
         "com_google_protobuf"
         "openjdk11_darwin_archive"
+        "openjdk11_darwin_aarch64_archive"
         "openjdk11_linux_archive"
         "openjdk11_windows_archive"
         "openjdk14_darwin_archive"
         "openjdk14_linux_archive"
         "openjdk14_windows_archive"
         "openjdk15_darwin_archive"
+        "openjdk15_darwin_aarch64_archive"
         "openjdk15_linux_archive"
         "openjdk15_windows_archive"
         "openjdk_linux_aarch64_minimal"
         "openjdk_linux_minimal"
         "openjdk_macos_minimal"
+        "openjdk_macos_aarch64_minimal"
         "openjdk_win_minimal"
         "remote_coverage_tools_for_testing"
         "remote_java_tools_darwin_for_testing"
@@ -308,12 +311,14 @@ EOF
         "remotejdk11_linux_ppc64le_for_testing"
         "remotejdk11_linux_s390x_for_testing"
         "remotejdk11_macos_for_testing"
+        "remotejdk11_macos_aarch64_for_testing"
         "remotejdk11_win_for_testing"
         "remotejdk14_linux_for_testing"
         "remotejdk14_macos_for_testing"
         "remotejdk14_win_for_testing"
         "remotejdk15_linux_for_testing"
         "remotejdk15_macos_for_testing"
+        "remotejdk15_macos_aarch64_for_testing"
         "remotejdk15_win_for_testing"
         "rules_cc"
         "rules_java"

tools/cpp/cc_configure.bzl

@@ -56,7 +56,7 @@ def cc_autoconf_toolchains_impl(repository_ctx):
 
     if not should_detect_cpp_toolchain:
         repository_ctx.file("BUILD", "# C++ toolchain autoconfiguration was disabled by BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN env variable.")
-    elif cpu_value == "darwin" and not should_use_cpp_only_toolchain:
+    elif cpu_value.startswith("darwin") and not should_use_cpp_only_toolchain:
         xcode_toolchains = []
 
         # Only detect xcode if the user didn't tell us it will be there.
@@ -120,7 +120,7 @@ def cc_autoconf_impl(repository_ctx, overriden_tools = dict()):
         # TODO(ibiryukov): overriden_tools are only supported in configure_unix_toolchain.
         # We might want to add that to Windows too(at least for msys toolchain).
         configure_windows_toolchain(repository_ctx)
-    elif (cpu_value == "darwin" and
+    elif (cpu_value.startswith("darwin") and
           ("BAZEL_USE_CPP_ONLY_TOOLCHAIN" not in env or env["BAZEL_USE_CPP_ONLY_TOOLCHAIN"] != "1")):
         configure_osx_toolchain(repository_ctx, overriden_tools)
     else:

tools/cpp/lib_cc_configure.bzl

@@ -181,7 +181,9 @@ def get_cpu_value(repository_ctx):
     """Compute the cpu_value based on the OS name. Doesn't %-escape the result!"""
     os_name = repository_ctx.os.name.lower()
     if os_name.startswith("mac os"):
-        return "darwin"
+        # Check if we are on x86_64 or arm64 and return the corresponding cpu value.
+        result = repository_ctx.execute(["uname", "-m"])
+        return "darwin" + ("_arm64" if result.stdout.strip() == "arm64" else "")
     if os_name.find("freebsd") != -1:
         return "freebsd"
     if os_name.find("openbsd") != -1: