Add initial visionOS support (#1076)

README.md

@@ -5,8 +5,8 @@
 This repository contains rules for [Bazel](https://bazel.build) that can be
 used to build Swift libraries, tests, and executables for macOS and Linux.
 
-To build applications for all of Apple's platforms (macOS, iOS, tvOS, and
-watchOS), they can be combined with the
+To build applications for all of Apple's platforms (macOS, iOS, tvOS,
+visionOS, and watchOS), they can be combined with the
 [Apple Rules](https://github.com/bazelbuild/rules_apple).
 
 If you run into any problems with these rules, please

swift/internal/target_triples.bzl

@@ -102,7 +102,7 @@ def _normalize_for_swift(triple, *, unversioned = False):
         A target triple struct containing the normalized triple.
     """
     os = _normalize_apple_os(triple.os, unversioned = unversioned)
-    if os.startswith(("ios", "macos", "tvos", "watchos")):
+    if os.startswith(("ios", "macos", "tvos", "visionos", "watchos")):
         return _make(
             cpu = _normalize_apple_cpu(triple.cpu),
             vendor = "apple",
@@ -163,6 +163,8 @@ def _platform_name_for_swift(triple):
         return "iphonesimulator" if is_simulator else "iphoneos"
     if os == "tvos":
         return "appletvsimulator" if is_simulator else "appletvos"
+    if os == "visionos":
+        return "visionossimulator" if is_simulator else "visionos"
     if os == "watchos":
         return "watchsimulator" if is_simulator else "watchos"
 

swift/internal/xcode_swift_toolchain.bzl

@@ -75,12 +75,23 @@ _TRIPLE_OS_TO_PLATFORM = {
     ("macos", None): apple_common.platform.macos,
     ("tvos", None): apple_common.platform.tvos_device,
     ("tvos", "simulator"): apple_common.platform.tvos_simulator,
+    # TODO: Remove getattr use once we no longer support 6.x
+    ("xros", None): getattr(apple_common.platform, "visionos_device", None),
+    ("xros", "simulator"): getattr(apple_common.platform, "visionos_simulator", None),
     ("watchos", None): apple_common.platform.watchos_device,
     ("watchos", "simulator"): apple_common.platform.watchos_simulator,
 }
 
 def _bazel_apple_platform(target_triple):
     """Returns the `apple_common.platform` value for the given target triple."""
+
+    # TODO: Remove once we no longer support 6.x
+    if target_triples.unversioned_os(target_triple) == "xros" and not hasattr(
+        apple_common.platform,
+        "visionos_device",
+    ):
+        fail("visionOS requested but your version of bazel doesn't support it")
+
     return _TRIPLE_OS_TO_PLATFORM[(
         target_triples.unversioned_os(target_triple),
         target_triple.environment,