Enable native support for Windows on arm64

.bazelci/build_bazel_binaries.yml

@@ -49,3 +49,13 @@ platforms:
     build_targets:
       - "//src:bazel.exe"
       - "//src:bazel_nojdk.exe"
+  windows_arm64:
+    build_flags:
+      - "--copt=-w"
+      - "--host_copt=-w"
+      - "-c"
+      - "opt"
+    build_targets:
+      - "//src:bazel.exe"
+      - "//src:bazel_nojdk.exe"
+      - "--cpu=arm64_windows"

WORKSPACE

@@ -254,6 +254,13 @@ http_file(
     urls = ["https://mirror.bazel.build/openjdk/azul-zulu11.37.17-ca-jdk11.0.6/zulu11.37.17-ca-jdk11.0.6-win_x64.zip"],
 )
 
+http_file(
+    name = "openjdk_win_arm64_vanilla",
+    downloaded_file_path = "zulu-win-arm64.zip",
+    sha256 = "811d7e7591bac4f081dfb00ba6bd15b6fc5969e1f89f0f327ef75147027c3877",
+    urls = ["https://cdn.azul.com/zulu/bin/zulu17.30.15-ca-jdk17.0.1-win_aarch64.zip"],
+)
+
 http_file(
     name = "openjdk_win_minimal",
     downloaded_file_path = "zulu-win-minimal.zip",

distdir_deps.bzl

@@ -136,6 +136,7 @@ DIST_DEPS = {
         "patch_args": ["-p1"],
         "patches": [
             "//third_party/grpc:grpc_1.41.0.patch",
+            "//third_party/grpc:grpc_1.41.0.win_arm64.patch",
         ],
         "used_in": [
             "additional_distfiles",

site/docs/windows.md

@@ -203,7 +203,9 @@ target architecture, set the `--cpu` build option for your target architecture:
 *  x64 (default):  `--cpu=x64_windows` or no option
 *  x86: `--cpu=x64_x86_windows`
 *  ARM: `--cpu=x64_arm_windows`
-*  ARM64: `--cpu=x64_arm64_windows`
+*  ARM64: `--cpu=arm64_windows`
+
+Note: `--cpu=x64_arm64_windows` to target ARM64 architecture is deprecated. Please use `--cpu=arm64_windows`
 
 For example, to build targets for ARM architecture, run:
 

src/BUILD

@@ -147,7 +147,10 @@ filegroup(
         "//src/conditions:darwin_arm64": [
             "@openjdk_macos_aarch64//file",
         ],
-        "//src/conditions:windows": [
+        "//src/conditions:windows_arm64": [
+            "@openjdk_win_arm64_vanilla//file", # TODO(#14339): replace with openjdk_win_arm64 when packages are uploaded to bazel mirror server
+        ],
+        "//src/conditions:windows_x86_64": [
             "@openjdk_win//file",
         ],
         "//src/conditions:linux_aarch64": [
@@ -169,7 +172,10 @@ filegroup(
         "//src/conditions:darwin_arm64": [
             "@openjdk_macos_aarch64_minimal//file",
         ],
-        "//src/conditions:windows": [
+        "//src/conditions:windows_arm64": [
+            "@openjdk_win_arm64_vanilla//file", # TODO(#14339): replace with openjdk_win_arm64 when packages are uploaded to bazel mirror server
+        ],
+        "//src/conditions:windows_x86_64": [
             "@openjdk_win_minimal//file",
         ],
         "//src/conditions:linux_aarch64": [

src/conditions/BUILD

@@ -167,6 +167,45 @@ config_setting(
     visibility = ["//visibility:public"],
 )
 
+config_setting(
+    name = "windows_x86_64",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+config_setting(
+    name = "windows_arm64_constraint",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:arm64",
+    ],
+)
+
+# TODO(https://github.com/bazelbuild/bazel/issues/7260)
+# Remove the flag after toolchain cc resolution is fixed
+config_setting(
+    name = "windows_x64_arm64_flag",
+    values = {"cpu": "x64_arm64_windows"},
+)
+
+config_setting(
+    name = "windows_arm64_flag",
+    values = {"cpu": "arm64_windows"},
+)
+
+selects.config_setting_group(
+    name = "windows_arm64",
+    match_any = [
+        ":windows_arm64_constraint",
+        ":windows_arm64_flag",
+        ":windows_x64_arm64_flag"
+    ],
+    visibility = ["//visibility:public"],
+)
+
 config_setting(
     name = "arm",
     constraint_values = ["@platforms//cpu:arm"],

src/conditions/BUILD.tools

@@ -1,3 +1,5 @@
+load("//tools/windows:windows_config.bzl", "create_windows_host_config")
+
 config_setting(
     name = "freebsd",
     constraint_values = ["@platforms//os:freebsd"],
@@ -118,20 +120,30 @@ config_setting(
     visibility = ["//visibility:public"],
 )
 
-# TODO: figure out how to base this selection on constraints
 config_setting(
-    name = "windows_msvc",
-    values = {"cpu": "x64_windows_msvc"},
-    visibility = ["//visibility:public"],
+    name = "windows_x64",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+)
+config_setting(
+    name = "windows_arm64",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:arm64",
+    ],
 )
 
 # TODO: figure out how to base this selection on constraints
 config_setting(
-    name = "host_windows",
-    values = {"host_cpu": "x64_windows"},
+    name = "windows_msvc",
+    values = {"cpu": "x64_windows_msvc"},
     visibility = ["//visibility:public"],
 )
 
+create_windows_host_config()
+
 config_setting(
     name = "remote",
     values = {"define": "EXECUTOR=remote"},

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

@@ -50,8 +50,10 @@ public String convert(String input) throws OptionsParsingException {
           switch (CPU.getCurrent()) {
             case X86_64:
               return "x64_windows";
+            case AARCH64:
+              return "arm64_windows";
             default:
-              // We only support x64 Windows for now.
+              // We only support x64 and arm64 Windows for now.
               return "unknown";
           }
         case LINUX:

src/test/py/bazel/bazel_windows_cpp_test.py

@@ -920,7 +920,7 @@ def testBuildArmCppBinaryWithMsvcCL(self):
     self.AssertExitCode(exit_code, 0, stderr)
     self.assertIn('arm\\cl.exe', '\n'.join(stderr))
 
-  def testBuildArm64CppBinaryWithMsvcCL(self):
+  def testBuildArm64CppBinaryWithMsvcCLAndCpuX64Arm64Windows(self):
     self.CreateWorkspaceWithDefaultRepos('WORKSPACE')
     self.ScratchFile('BUILD', [
         'cc_binary(',
@@ -1033,6 +1033,24 @@ def testBuildCppBinaryWithMsysGCC(self):
     self.AssertFileContentContains(
         os.path.join(bazel_output, paramfile % 'opt'), '-Wl,--gc-sections')
 
+  def testBuildArm64CppBinaryWithMsvcCLAndCpuArm64Windows(self):
+    self.CreateWorkspaceWithDefaultRepos('WORKSPACE')
+    self.ScratchFile('BUILD', [
+        'cc_binary(',
+        '  name = "main",',
+        '  srcs = ["main.cc"],',
+        ')',
+    ])
+    self.ScratchFile('main.cc', [
+        'int main() {',
+        '  return 0;',
+        '}',
+    ])
+    exit_code, _, stderr = self.RunBazel(
+        ['build', '-s', '--cpu=arm64_windows', '//:main'])
+    self.AssertExitCode(exit_code, 0, stderr)
+    self.assertIn('arm64\\cl.exe', ''.join(stderr))
+
 
 if __name__ == '__main__':
   unittest.main()

tools/BUILD

@@ -24,6 +24,7 @@ filegroup(
         "//tools/objc:srcs",
         "//tools/osx:srcs",
         "//tools/osx/crosstool:srcs",
+        "//tools/windows:srcs",
         "//tools/test:srcs",
         "//tools/test/CoverageOutputGenerator/java/com/google/devtools/coverageoutputgenerator:srcs",
         "//tools/test/CoverageOutputGenerator/javatests/com/google/devtools/coverageoutputgenerator:srcs",
@@ -55,6 +56,7 @@ filegroup(
         "//tools/jdk:srcs",
         "//tools/launcher:srcs",
         "//tools/def_parser:srcs",
+        "//tools/windows:srcs",
         "//tools/platforms:srcs",
         "//tools/objc:srcs",
         "//tools/python:embedded_tools",
@@ -80,6 +82,7 @@ filegroup(
         "//tools/cpp:bzl_srcs",
         "//tools/jdk:bzl_srcs",
         "//tools/osx:bzl_srcs",
+        "//tools/windows:bzl_srcs",
         "//tools/python:bzl_srcs",
         "//tools/sh:bzl_srcs",
     ],