Switch to use --@bazel_build_rules_swift//swift:static_stdlib to control the flags.

Author: liuliu

swift/BUILD

@@ -1,5 +1,5 @@
 load("@bazel_skylib//:bzl_library.bzl", "bzl_library")
-load("@bazel_skylib//rules:common_settings.bzl", "bool_setting")
+load("@bazel_skylib//rules:common_settings.bzl", "bool_flag", "bool_setting")
 load(
     "//swift/internal:build_settings.bzl",
     "per_module_swiftcopt_flag",
@@ -60,6 +60,12 @@ per_module_swiftcopt_flag(
     visibility = ["//visibility:public"],
 )
 
+# Configuration flag for statically linking stdlib.
+bool_flag(
+    name = "static_stdlib",
+    build_setting_default = False,
+)
+
 # Configuration setting for enabling the generation of swiftinterface files.
 bool_setting(
     name = "emit_swiftinterface",

swift/internal/attrs.bzl

@@ -90,6 +90,11 @@ def swift_compilation_attrs(
         swift_common_rule_attrs(
             additional_deps_aspects = additional_deps_aspects,
         ),
+        {
+            "_static_stdlib": attr.label(
+                default = "@build_bazel_rules_swift//swift:static_stdlib",
+            ),
+        },
         swift_toolchain_attrs(),
         {
             "srcs": attr.label_list(
@@ -366,6 +371,9 @@ that it is invoked in the correct mode (i.e., `swift`, `swiftc`,
 `swift-autolink-extract`, etc.).
 """,
         ),
+        "_static_stdlib": attr.label(
+            default = "@build_bazel_rules_swift//swift:static_stdlib",
+        ),
         "_default_swift_executable": attr.label(
             allow_files = True,
             cfg = "exec",

swift/internal/compiling.bzl

@@ -62,7 +62,6 @@ load(
     "SWIFT_FEATURE_USE_GLOBAL_MODULE_CACHE",
     "SWIFT_FEATURE_USE_PCH_OUTPUT_DIR",
     "SWIFT_FEATURE_VFSOVERLAY",
-    "SWIFT_FEATURE_STATIC_STDLIB",
     "SWIFT_FEATURE__NUM_THREADS_0_IN_SWIFTCOPTS",
     "SWIFT_FEATURE__WMO_IN_SWIFTCOPTS",
 )
@@ -911,16 +910,6 @@ def compile_action_configs(
             ],
             configurators = [_static_frameworks_disable_autolink_configurator],
         ),
-
-        # Enable the built modules to reference static Swift standard libraries.
-        swift_toolchain_config.action_config(
-            actions = [
-                swift_action_names.COMPILE,
-                swift_action_names.DERIVE_FILES,
-            ],
-            configurators = [swift_toolchain_config.add_arg("-static-stdlib")],
-            features = [SWIFT_FEATURE_STATIC_STDLIB],
-        ),
     ]
 
     # NOTE: The positions of these action configs in the list are important,

swift/internal/feature_names.bzl

@@ -261,10 +261,6 @@ SWIFT_FEATURE_ENABLE_SKIP_FUNCTION_BODIES = "swift.skip_function_bodies_for_deri
 # swift.coverage_prefix_map also remap the path in coverage data.
 SWIFT_FEATURE_REMAP_XCODE_PATH = "swift.remap_xcode_path"
 
-# If enabled the built binary will statically link Swift standard libraries.
-# This requires Swift 5.3.1
-SWIFT_FEATURE_STATIC_STDLIB = "swift.static_stdlib"
-
 # A private feature that is set by the toolchain if a flag enabling WMO was
 # passed on the command line using `--swiftcopt`. Users should never manually
 # enable, disable, or query this feature.

swift/internal/swift_library.bzl

@@ -121,6 +121,9 @@ def _swift_library_impl(ctx):
         extra_features.append(SWIFT_FEATURE_ENABLE_LIBRARY_EVOLUTION)
         extra_features.append(SWIFT_FEATURE_EMIT_SWIFTINTERFACE)
 
+    if ctx.attr._static_stdlib[BuildSettingInfo].value:
+        copts.append("-static-stdlib")
+
     module_name = ctx.attr.module_name
     if not module_name:
         module_name = swift_common.derive_module_name(ctx.label)

swift/internal/swift_toolchain.bzl

@@ -20,6 +20,7 @@ toolchain, see `swift.bzl`.
 """
 
 load("@bazel_skylib//lib:dicts.bzl", "dicts")
+load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo")
 load("@bazel_tools//tools/cpp:toolchain_utils.bzl", "find_cpp_toolchain")
 load(":actions.bzl", "swift_action_names")
 load(":attrs.bzl", "swift_toolchain_driver_attrs")
@@ -31,7 +32,6 @@ load(
     "SWIFT_FEATURE_MODULE_MAP_HOME_IS_CWD",
     "SWIFT_FEATURE_NO_GENERATED_MODULE_MAP",
     "SWIFT_FEATURE_USE_RESPONSE_FILES",
-    "SWIFT_FEATURE_STATIC_STDLIB",
 )
 load(":features.bzl", "features_for_build_modes")
 load(":providers.bzl", "SwiftFeatureAllowlistInfo", "SwiftToolchainInfo")
@@ -192,14 +192,15 @@ def _swift_linkopts_cc_info(
 def _swift_toolchain_impl(ctx):
     toolchain_root = ctx.attr.root
     cc_toolchain = find_cpp_toolchain(ctx)
+    static_stdlib = ctx.attr._static_stdlib[BuildSettingInfo].value
 
     swift_linkopts_cc_info = _swift_linkopts_cc_info(
         cc_toolchain,
         ctx.attr.arch,
         ctx.attr.os,
         ctx.label,
         toolchain_root,
-        SWIFT_FEATURE_STATIC_STDLIB in ctx.features,
+        static_stdlib,
     )
 
     # Combine build mode features, autoconfigured features, and required