Add a build test of a basic apple_metal_library target

.bazelrc

@@ -10,7 +10,7 @@ build:engflow_common --disk_cache=
 build:engflow_common --incompatible_strict_action_env=true
 build:engflow_common --remote_timeout=3600
 build:engflow_common --grpc_keepalive_time=30s
-build:engflow_common --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+build:engflow_common --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
 
 # Options for continuous testing.
 build:ci --color=yes
@@ -33,7 +33,7 @@ build:clang --host_cxxopt="-fvisibility=hidden"
 # iOS setup
 build:ios --ios_multi_cpus=sim_arm64
 build:ios --macos_cpus=arm64
-build:ios --@rules_apple//apple/build_settings:ios_simulator_device="iPhone 16 Pro"
+build:ios --@rules_apple//apple/build_settings:ios_simulator_device="iPhone 17"
 
 # Platform-specific options for each supported platform.
 build:remote_linux_x64 --extra_execution_platforms=//platform/linux_x64
@@ -45,15 +45,16 @@ build:remote_macos_arm64 --config=clang
 build:remote_macos_arm64 --host_platform=//platform/macos_arm64
 build:remote_macos_arm64 --platforms=//platform/macos_arm64
 build:remote_macos_arm64 --macos_minimum_os=14
-build:remote_macos_arm64 --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
-build:remote_macos_arm64 --host_action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
-build:remote_macos_arm64 --xcode_version_config=//platform/macos_arm64:installed_xcodes
+build:remote_macos_arm64 --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+build:remote_macos_arm64 --repo_env=BAZEL_NO_APPLE_CPP_TOOLCHAIN=1
+build:remote_macos_arm64 --xcode_version_config=//platform/macos_arm64/xcode:installed_xcodes
+build:remote_macos_arm64 --extra_toolchains=//platform/macos_arm64/cc:all
 # Disable workers: Builds fail with remote swift workers
 build:remote_macos_arm64 --experimental_remote_mark_tool_inputs=false
 
 build:remote_windows_x64 --host_platform=//platform/windows_x64
 build:remote_windows_x64 --platforms=//platform/windows_x64
-build:remote_windows_x64 --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+build:remote_windows_x64 --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
 build:remote_windows_x64 --extra_execution_platforms=//platform/windows_x64
 build:remote_windows_x64 --extra_toolchains=//platform/windows_x64:cc-toolchain
 

MODULE.bazel

@@ -160,3 +160,4 @@ scala_deps.scala()
 scala_deps.scalatest()
 
 bazel_dep(name = "rules_shell", version = "0.8.0")
+bazel_dep(name = "bazel_features", version = "1.54.1")

ios/BUILD

@@ -1,6 +1,7 @@
 load("@bazel_skylib//rules:build_test.bzl", "build_test")
 load("@rules_apple//apple:ios.bzl", "ios_application", "ios_ui_test", "ios_unit_test")
-load("@rules_apple//apple:macos.bzl", "macos_unit_test")
+load("@rules_apple//apple:macos.bzl", "macos_build_test", "macos_unit_test")
+load("@rules_apple//apple:resources.bzl", "apple_metal_library")
 load("@rules_swift//swift:swift.bzl", "swift_library")
 
 swift_library(
@@ -63,3 +64,21 @@ macos_unit_test(
     ],
     deps = [":HelloTestLib"],
 )
+
+apple_metal_library(
+    name = "SampleMetal",
+    srcs = ["sample.metal"],
+    out = "Sample.metallib",
+    hdrs = ["shader_defines.h"],
+)
+
+macos_build_test(
+    name = "SampleMetalBuildTest",
+    minimum_os_version = "14.0",
+    targets = [
+        ":SampleMetal",
+    ],
+    tags = [
+        "no-local-macos-ci",  # Mac local will fail (metal not installed)
+    ],
+)

ios/sample.metal

@@ -0,0 +1,5 @@
+#include <metal_stdlib>
+
+using namespace metal;
+
+// Just exists to make the compiler do some work.

ios/shader_defines.h

@@ -0,0 +1,6 @@
+#ifndef SHADER_DEFINES_H
+#define SHADER_DEFINES_H
+
+// Just exists to make the compiler do some work.
+
+#endif

platform/macos_arm64/BUILD

@@ -1,7 +1,3 @@
-load("@apple_support//xcode:available_xcodes.bzl", "available_xcodes")
-load("@apple_support//xcode:xcode_config.bzl", "xcode_config")
-load("@apple_support//xcode:xcode_version.bzl", "xcode_version")
-
 package(default_visibility = ["//visibility:public"])
 
 # The platform definition for a remote mac worker.
@@ -17,55 +13,3 @@ platform(
     },
 )
 
-# The XCode installed on the remote worker.
-xcode_version(
-    name = "version26_5_0_17F42",
-    aliases = [
-        "26.5.0",
-        "26.5",
-        "17F42",
-        "26.5.0.17F42",
-        "26",
-    ],
-    default_ios_sdk_version = "26.5",
-    default_macos_sdk_version = "26.5",
-    default_tvos_sdk_version = "26.5",
-    default_visionos_sdk_version = "26.5",
-    default_watchos_sdk_version = "26.5",
-    version = "26.5.0.17F42",
-)
-
-xcode_version(
-    name = "version27_2_0_27B52",
-    aliases = [
-        "27.2.0",
-        "27.2.0.27B52",
-        "27B52",
-        "27.2",
-        "27",
-    ],
-    default_ios_sdk_version = "27.2",
-    default_macos_sdk_version = "27.2",
-    default_tvos_sdk_version = "27.2",
-    default_visionos_sdk_version = "27.2",
-    default_watchos_sdk_version = "27.2",
-    version = "27.2.0.27B52",
-)
-
-xcode_config(
-    name = "installed_xcodes",
-    default = ":version26_5_0_17F42",
-    versions = [
-        ":version26_5_0_17F42",
-        ":version27_2_0_27B52",
-    ],
-)
-
-available_xcodes(
-    name = "available_xcodes",
-    default = ":version26_5_0_17F42",
-    versions = [
-        ":version26_5_0_17F42",
-        ":version27_2_0_27B52",
-    ],
-)

platform/macos_arm64/cc/BUILD.bazel

@@ -0,0 +1,125 @@
+# Copied from `bazel info output_base`/external/apple_support++apple_cc_configure_extension+local_config_apple_cc_toolchains/BUILD
+
+package(default_visibility = ["//visibility:public"])
+
+load("@apple_support//configs:platforms.bzl", "APPLE_PLATFORMS_CONSTRAINTS")
+load("@rules_cc//cc:defs.bzl", "cc_library", "cc_toolchain", "cc_toolchain_suite")
+load("@apple_support//configs:platforms.bzl", "APPLE_PLATFORMS_CONSTRAINTS")
+load(":cc_toolchain_config.bzl", "cc_toolchain_config")
+
+_APPLE_ARCHS = APPLE_PLATFORMS_CONSTRAINTS.keys()
+
+CC_TOOLCHAINS = [(
+    cpu + "|clang",
+    ":cc-compiler-" + cpu,
+) for cpu in _APPLE_ARCHS] + [(
+    cpu,
+    ":cc-compiler-" + cpu,
+) for cpu in _APPLE_ARCHS] + [
+    ("k8|clang", ":cc-compiler-darwin_x86_64"),
+    ("darwin|clang", ":cc-compiler-darwin_x86_64"),
+    ("k8", ":cc-compiler-darwin_x86_64"),
+    ("darwin", ":cc-compiler-darwin_x86_64"),
+]
+
+cc_library(
+    name = "link_extra_lib",
+)
+
+cc_library(
+    name = "malloc",
+)
+
+filegroup(
+    name = "empty",
+    srcs = [],
+)
+
+cc_toolchain_suite(
+    name = "toolchain",
+    toolchains = dict(CC_TOOLCHAINS),
+)
+
+filegroup(
+    name = "modulemap",
+    srcs = [
+"@apple_support//crosstool:exec_layering_check_modulemap",
+    ],
+)
+
+filegroup(
+    name = "tools",
+    srcs = [
+        "@apple_support//crosstool:exec_libtool",
+        "@apple_support//crosstool:exec_wrapped_clang",
+        "@apple_support//crosstool:exec_wrapped_clang_pp",
+        ":modulemap",
+    ],
+)
+
+[
+    cc_toolchain(
+        name = "cc-compiler-" + arch,
+        all_files = ":tools",
+        ar_files = ":tools",
+        as_files = ":tools",
+        compiler_files = ":tools",
+        dwp_files = ":empty",
+        linker_files = ":tools",
+        objcopy_files = ":empty",
+        strip_files = ":tools",
+        supports_header_parsing = 1,
+        supports_param_files = 1,
+        toolchain_config = arch,
+        toolchain_identifier = arch,
+        module_map = "@apple_support//crosstool:module.modulemap",
+    )
+    for arch in _APPLE_ARCHS
+]
+
+[
+    cc_toolchain_config(
+        name = arch,
+        cpu = arch,
+        features = [
+            "no_warn_duplicate_libraries",
+            "reproducible_linker_flag",
+        ],
+        cxx_builtin_include_directories = [
+            "/Applications/",
+            "/Library/",
+        ],
+        libtool = "@apple_support//crosstool:exec_libtool",
+        tool_paths_overrides = {},
+        c_flags = [],
+        conly_flags = [],
+        cxx_flags = ["-std=c++17"],
+        link_flags = [],
+        module_map = ":modulemap",
+        wrapped_clang = "@apple_support//crosstool:exec_wrapped_clang",
+        wrapped_clang_pp = "@apple_support//crosstool:exec_wrapped_clang_pp",
+    )
+    for arch in _APPLE_ARCHS
+]
+
+_OSX_DEVELOPER_PLATFORM_CPUS = [
+    "arm64",
+    "x86_64",
+]
+
+[
+    toolchain(
+        name = "cc-toolchain-" + arch + "-" + cpu,
+        exec_compatible_with = [
+            # These only execute on macOS.
+            "@platforms//os:macos",
+            "@platforms//cpu:" + cpu,
+        ],
+        target_compatible_with = APPLE_PLATFORMS_CONSTRAINTS[arch],
+        toolchain = "@apple_support//toolchain".format(arch),
+        toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+        visibility = ["//visibility:public"],
+    )
+    for arch in APPLE_PLATFORMS_CONSTRAINTS.keys()
+    for cpu in _OSX_DEVELOPER_PLATFORM_CPUS
+]