Swift: Build incompatible OS diagnostic on all platforms.

swift/BUILD.bazel

@@ -77,12 +77,12 @@ pkg_filegroup(
         ":extractor",
         ":swift-test-sdk-arch",
     ] + select({
-        "@platforms//os:linux": [
-            ":incompatible-os",
-        ],
         "@platforms//os:macos": [
             ":xcode-autobuilder",
         ],
+        "//conditions:default": [
+            ":incompatible-os",
+        ],
     }),
     visibility = ["//visibility:public"],
 )

swift/logging/SwiftLogging.cpp

@@ -3,7 +3,11 @@
 #include <filesystem>
 #include <stdlib.h>
 #include <optional>
+#ifdef _WIN32
+#include <process.h>
+#else
 #include <unistd.h>
+#endif
 #include "absl/strings/str_cat.h"
 
 #define LEVEL_REGEX_PATTERN "trace|debug|info|warning|error|critical|no_logs"

swift/rules.bzl

@@ -10,11 +10,13 @@ def _wrap_cc(rule, kwargs):
         # temporary, before we do universal merging
         "-universal_binaries",
     ])
-    _add_args(kwargs, "target_compatible_with", select({
-        "@platforms//os:linux": [],
-        "@platforms//os:macos": [],
-        "//conditions:default": ["@platforms//:incompatible"],
-    }))
+    if "target_compatible_with" not in kwargs:
+        # Restrict to Linux or macOS by default, but allow overriding
+        _add_args(kwargs, "target_compatible_with", select({
+            "@platforms//os:linux": [],
+            "@platforms//os:macos": [],
+            "//conditions:default": ["@platforms//:incompatible"],
+        }))
     rule(**kwargs)
 
 def swift_cc_binary(**kwargs):

swift/tools/autobuilder-diagnostics/BUILD.bazel

@@ -7,4 +7,6 @@ swift_cc_binary(
     deps = [
         "//swift/logging",
     ],
+    # No restrictions (Windows allowed)
+    target_compatible_with = [],
 )