Un-conditionalize logic for features that require Xcode 15.0 or highe…

…r (dropping support for Xcode 14) (#1311)

PiperOrigin-RevId: 640116533

Cherry picks:
f235362

Submitting to the App Store requires Xcode 15+ so this cherry pick (and
some other changes to < Xcode 15 logic I made) drops support for Xcodes
less than 15

---------

Co-authored-by: Tony Allevato <[email protected]>

swift/internal/compiling.bzl

@@ -49,8 +49,6 @@ load(
     "SWIFT_FEATURE_USE_EXPLICIT_SWIFT_MODULE_MAP",
     "SWIFT_FEATURE_VFSOVERLAY",
     "SWIFT_FEATURE__NUM_THREADS_0_IN_SWIFTCOPTS",
-    "SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION",
-    "SWIFT_FEATURE__SUPPORTS_MACROS",
     "SWIFT_FEATURE__WMO_IN_SWIFTCOPTS",
 )
 load(
@@ -493,13 +491,7 @@ def compile(
         feature_name = SWIFT_FEATURE_EMIT_SWIFTSOURCEINFO,
     )
 
-    if is_feature_enabled(
-        feature_configuration = feature_configuration,
-        feature_name = SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION,
-    ):
-        const_protocols_to_gather_file = swift_toolchain.const_protocols_to_gather
-    else:
-        const_protocols_to_gather_file = []
+    const_protocols_to_gather_file = swift_toolchain.const_protocols_to_gather
 
     compile_outputs, other_outputs = _declare_compile_outputs(
         srcs = srcs,
@@ -1313,10 +1305,7 @@ def _declare_compile_outputs(
     else:
         indexstore_directory = None
 
-    if is_feature_enabled(
-        feature_configuration = feature_configuration,
-        feature_name = SWIFT_FEATURE__SUPPORTS_MACROS,
-    ) and not is_feature_enabled(
+    if not is_feature_enabled(
         feature_configuration = feature_configuration,
         feature_name = SWIFT_FEATURE_OPT,
     ):

swift/internal/feature_names.bzl

@@ -314,11 +314,6 @@ SWIFT_FEATURE_OBJC_LINK_FLAGS = "swift.objc_link_flag"
 # all Swift compilations to always be linked.
 SWIFT_FEATURE__FORCE_ALWAYSLINK_TRUE = "swift._force_alwayslink_true"
 
-# A private feature that is set by the toolchain if it supports macros (Swift
-# 5.9 and above). Users should never manually enable, disable, or query this
-# feature.
-SWIFT_FEATURE__SUPPORTS_MACROS = "swift._supports_macros"
-
 # Disables Swift sandbox which prevents issues with nested sandboxing when Swift code contains system-provided macros.
 # If enabled '#Preview' macro provided by SwiftUI fails to build and probably other system-provided macros.
 # Enabled by default for Swift 5.10+ on macOS.
@@ -341,11 +336,6 @@ SWIFT_FEATURE_EMIT_SWIFTSOURCEINFO = "swift.emit_swiftsourceinfo"
 # multiple frameworks with different target name, but same module name.
 SWIFT_FEATURE_ADD_TARGET_NAME_TO_OUTPUT = "swift.add_target_name_to_output"
 
-# A private feature that is set by the toolchain if it supports constant values
-# extraction (Swift 5.8 and above). Users should never manually enable, disable, or query this
-# feature.
-SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION = "swift._supports_const_value_extraction"
-
 # Enable thin LTO and update output-file-map correctly
 SWIFT_FEATURE_THIN_LTO = "swift.thin_lto"
 

swift/internal/swift_autoconfiguration.bzl

@@ -40,7 +40,6 @@ load(
     "SWIFT_FEATURE_USE_AUTOLINK_EXTRACT",
     "SWIFT_FEATURE_USE_MODULE_WRAP",
     "SWIFT_FEATURE_USE_OLD_DRIVER",
-    "SWIFT_FEATURE__SUPPORTS_MACROS",
 )
 
 def _scratch_file(repository_ctx, temp_dir, name, content = ""):
@@ -154,30 +153,6 @@ def _write_swift_version(repository_ctx, swiftc_path):
     repository_ctx.file(filename, contents, executable = False)
     return filename
 
-def _fetch_supported_features(repository_ctx, swiftc_path):
-    """Fetch the json config of supported features from Swift
-
-    This can be used to flip rules specific features
-
-    Args:
-        repository_ctx: The repository context.
-        swiftc_path: The `path` to the `swiftc` executable.
-
-    Returns:
-        The list of supported features, or an empty array if it fails
-    """
-    repository_ctx.file("empty.swift")
-    result = repository_ctx.execute([
-        swiftc_path,
-        "-frontend",
-        "-emit-supported-features",
-        "empty.swift",
-    ])
-    if result.return_code == 0:
-        return json.decode(result.stdout.strip()).get("SupportedArguments", [])
-
-    return []
-
 def _compute_feature_values(repository_ctx, swiftc_path):
     """Computes a list of supported/unsupported features by running checks.
 
@@ -259,10 +234,6 @@ def _create_linux_toolchain(repository_ctx):
     feature_values.append(SWIFT_FEATURE_USE_AUTOLINK_EXTRACT)
     feature_values.append(SWIFT_FEATURE_USE_MODULE_WRAP)
 
-    swift_features_config = _fetch_supported_features(repository_ctx, path_to_swiftc)
-    if "load-plugin-executable" in swift_features_config:
-        feature_values.append(SWIFT_FEATURE__SUPPORTS_MACROS)
-
     repository_ctx.file(
         "BUILD",
         """

swift/swift_compiler_plugin.bzl

@@ -24,7 +24,6 @@ load(
 load(
     "@build_bazel_rules_swift//swift/internal:feature_names.bzl",
     "SWIFT_FEATURE_ADD_TARGET_NAME_TO_OUTPUT",
-    "SWIFT_FEATURE__SUPPORTS_MACROS",
 )
 load("//swift/internal:features.bzl", "is_feature_enabled")
 load(
@@ -59,12 +58,6 @@ def _swift_compiler_plugin_impl(ctx):
         unsupported_features = ctx.disabled_features,
     )
 
-    if not is_feature_enabled(
-        feature_configuration = feature_configuration,
-        feature_name = SWIFT_FEATURE__SUPPORTS_MACROS,
-    ):
-        fail("Swift compiler plugins require Swift 5.9+")
-
     deps = ctx.attr.deps
     srcs = ctx.files.srcs
     module_contexts = []

swift/toolchains/config/compile_config.bzl

@@ -75,8 +75,6 @@ load(
     "SWIFT_FEATURE_USE_PCH_OUTPUT_DIR",
     "SWIFT_FEATURE_VFSOVERLAY",
     "SWIFT_FEATURE__NUM_THREADS_0_IN_SWIFTCOPTS",
-    "SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION",
-    "SWIFT_FEATURE__SUPPORTS_MACROS",
     "SWIFT_FEATURE__WMO_IN_SWIFTCOPTS",
 )
 load(":action_config.bzl", "ActionConfigInfo", "ConfigResultInfo", "add_arg")
@@ -254,7 +252,6 @@ def compile_action_configs(
         ActionConfigInfo(
             actions = [SWIFT_ACTION_COMPILE],
             configurators = [_constant_value_extraction_configurator],
-            features = [SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION],
         ),
 
         # Link Time Optimization (LTO).
@@ -811,7 +808,6 @@ def compile_action_configs(
                 SWIFT_ACTION_DERIVE_FILES,
             ],
             configurators = [_macro_expansion_configurator],
-            features = [SWIFT_FEATURE__SUPPORTS_MACROS],
         ),
 
         # swift-symbolgraph-extract doesn't yet support explicit Swift module

swift/toolchains/xcode_swift_toolchain.bzl

@@ -64,10 +64,7 @@ load(
     "SWIFT_FEATURE_REMAP_XCODE_PATH",
     "SWIFT_FEATURE_SUPPORTS_BARE_SLASH_REGEX",
     "SWIFT_FEATURE_USE_GLOBAL_MODULE_CACHE",
-    "SWIFT_FEATURE_USE_OLD_DRIVER",
     "SWIFT_FEATURE__FORCE_ALWAYSLINK_TRUE",
-    "SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION",
-    "SWIFT_FEATURE__SUPPORTS_MACROS",
 )
 load("//swift/internal:features.bzl", "features_for_build_modes")
 load("//swift/internal:target_triples.bzl", "target_triples")
@@ -699,34 +696,23 @@ def _xcode_swift_toolchain_impl(ctx):
         SWIFT_FEATURE_CACHEABLE_SWIFTMODULES,
         SWIFT_FEATURE_COVERAGE_PREFIX_MAP,
         SWIFT_FEATURE_DEBUG_PREFIX_MAP,
+        SWIFT_FEATURE_DISABLE_SYSTEM_INDEX,
         SWIFT_FEATURE_EMIT_SWIFTDOC,
         SWIFT_FEATURE_EMIT_SWIFTSOURCEINFO,
         SWIFT_FEATURE_ENABLE_BATCH_MODE,
         SWIFT_FEATURE_ENABLE_SKIP_FUNCTION_BODIES,
-        SWIFT_FEATURE_DISABLE_SYSTEM_INDEX,
+        SWIFT_FEATURE_FILE_PREFIX_MAP,
         SWIFT_FEATURE_OBJC_LINK_FLAGS,
         SWIFT_FEATURE_OPT_USES_WMO,
         SWIFT_FEATURE_REMAP_XCODE_PATH,
+        SWIFT_FEATURE_SUPPORTS_BARE_SLASH_REGEX,
         SWIFT_FEATURE_USE_GLOBAL_MODULE_CACHE,
     ])
 
     # The new driver had response file bugs in Xcode 13.x that are fixed in
-    # Xcode 14.
-    if not _is_xcode_at_least_version(xcode_config, "14.0"):
-        requested_features.append(SWIFT_FEATURE_USE_OLD_DRIVER)
-
-    # Xcode 14 implies Swift 5.7.
-    if _is_xcode_at_least_version(xcode_config, "14.0"):
-        requested_features.append(SWIFT_FEATURE_FILE_PREFIX_MAP)
-        requested_features.append(SWIFT_FEATURE_SUPPORTS_BARE_SLASH_REGEX)
-
     if getattr(ctx.fragments.objc, "alwayslink_by_default", False):
         requested_features.append(SWIFT_FEATURE__FORCE_ALWAYSLINK_TRUE)
 
-    if _is_xcode_at_least_version(xcode_config, "15.0"):
-        requested_features.append(SWIFT_FEATURE__SUPPORTS_MACROS)
-        requested_features.append(SWIFT_FEATURE__SUPPORTS_CONST_VALUE_EXTRACTION)
-
     if _is_xcode_at_least_version(xcode_config, "15.3"):
         requested_features.append(SWIFT_FEATURE_DISABLE_SWIFT_SANDBOX)
 

test/const_values_tests.bzl

@@ -26,14 +26,6 @@ load(
 
 const_values_test = make_action_command_line_test_rule()
 
-no_const_values_test = make_action_command_line_test_rule(
-    config_settings = {
-        "//command_line_option:features": [
-            "-swift._supports_const_value_extraction",
-        ],
-    },
-)
-
 const_values_wmo_test = make_provider_test_rule(
     config_settings = {
         str(Label("@build_bazel_rules_swift//swift:copt")): [
@@ -98,19 +90,6 @@ def const_values_test_suite(name, tags = []):
         target_under_test = "@build_bazel_rules_swift//test/fixtures/basic:first",
     )
 
-    no_const_values_test(
-        name = "{}_not_expected_argv".format(name),
-        not_expected_argv = [
-            "-Xfrontend -const-gather-protocols-file",
-            "-Xfrontend swift/toolchains/config/const_protocols_to_gather.json",
-            "-emit-const-values-path",
-            "first.swift.swiftconstvalues",
-        ],
-        mnemonic = "SwiftCompile",
-        tags = all_tags,
-        target_under_test = "@build_bazel_rules_swift//test/fixtures/basic:first",
-    )
-
     native.test_suite(
         name = name,
         tags = all_tags,