Remove emit_swiftinterface from the Apple rule transitions.

Instead of relying on the transition to set the flag throughout the dependency graph, users should set `library_evolution = True` on the specific libraries that they want to support library evolution.

PiperOrigin-RevId: 629760009
(cherry picked from commit 24a862d)

apple/internal/transition_support.bzl

@@ -206,7 +206,6 @@ def _is_arch_supported_for_target_tuple(*, environment_arch, minimum_os_version,
 def _command_line_options(
         *,
         apple_platforms = [],
-        emit_swiftinterface = False,
         environment_arch = None,
         force_bundle_outputs = False,
         minimum_os_version,
@@ -221,8 +220,6 @@ def _command_line_options(
             first element will be applied to `platforms` as that will be what is resolved by the
             underlying rule. Defaults to an empty list, which will signal to Bazel that platform
             mapping can take place as a fallback measure.
-        emit_swiftinterface: Wheither to emit swift interfaces for the given target. Defaults to
-            `False`.
         environment_arch: A valid Apple environment when applicable with its architecture as a
             string (for example `sim_arm64` from `ios_sim_arm64`, or `arm64` from `ios_arm64`), or
             None to infer a value from command line options passed through settings.
@@ -284,7 +281,6 @@ def _command_line_options(
             platform = "watchos",
             platform_type = platform_type,
         ),
-        "@build_bazel_rules_swift//swift:emit_swiftinterface": emit_swiftinterface,
     }
 
 def _xcframework_split_attr_key(*, arch, environment, platform_type):
@@ -320,7 +316,6 @@ def _resolved_environment_arch_for_arch(*, arch, environment, platform_type):
 
 def _command_line_options_for_xcframework_platform(
         *,
-        attr,
         minimum_os_version,
         platform_attr,
         platform_type,
@@ -329,7 +324,6 @@ def _command_line_options_for_xcframework_platform(
     """Generates a dictionary of command line options keyed by 1:2+ transition for this platform.
 
     Args:
-        attr: The attributes passed to the transition function.
         minimum_os_version: A string representing the minimum OS version specified for this
             platform, represented as a dotted version number (for example, `"9.0"`).
         platform_attr: The attribute for the apple platform specifying in dictionary form which
@@ -363,10 +357,6 @@ def _command_line_options_for_xcframework_platform(
                     environment = target_environment,
                     platform_type = platform_type,
                 ): _command_line_options(
-                    emit_swiftinterface = _should_emit_swiftinterface(
-                        attr,
-                        is_xcframework = True,
-                    ),
                     environment_arch = resolved_environment_arch,
                     minimum_os_version = minimum_os_version,
                     platform_type = platform_type,
@@ -377,28 +367,10 @@ def _command_line_options_for_xcframework_platform(
 
     return output_dictionary
 
-def _should_emit_swiftinterface(attr, is_xcframework = False):
-    """Determines if a .swiftinterface file should be generated for Swift dependencies.
-
-    Needed until users of the framework rules are allowed to enable
-    library evolution on specific targets instead of having it automatically
-    applied to the entire dependency subgraph.
-    """
-
-    features = getattr(attr, "features", [])
-    if type(features) == "list" and "apple.no_legacy_swiftinterface" in features:
-        return False
-
-    # iOS and tvOS static frameworks require underlying swift_library targets generate a Swift
-    # interface file. These rules define a private attribute called `_emitswiftinterface` that
-    # let's this transition flip rules_swift config down the build graph.
-    return is_xcframework or hasattr(attr, "_emitswiftinterface")
-
 def _apple_rule_base_transition_impl(settings, attr):
     """Rule transition for Apple rules using Bazel CPUs and a valid Apple split transition."""
     platform_type = attr.platform_type
     return _command_line_options(
-        emit_swiftinterface = _should_emit_swiftinterface(attr),
         environment_arch = _environment_archs(platform_type, settings)[0],
         minimum_os_version = attr.minimum_os_version,
         platform_type = platform_type,
@@ -444,7 +416,6 @@ _apple_rule_base_transition_outputs = [
     "//command_line_option:platforms",
     "//command_line_option:tvos_minimum_os",
     "//command_line_option:watchos_minimum_os",
-    "@build_bazel_rules_swift//swift:emit_swiftinterface",
 ]
 _apple_universal_binary_rule_transition_outputs = _apple_rule_base_transition_outputs + [
     "//command_line_option:ios_multi_cpus",
@@ -469,7 +440,6 @@ def _apple_platforms_rule_base_transition_impl(settings, attr):
         environment_arch = _environment_archs(platform_type, settings)[0]
     return _command_line_options(
         apple_platforms = settings["//command_line_option:apple_platforms"],
-        emit_swiftinterface = _should_emit_swiftinterface(attr),
         environment_arch = environment_arch,
         minimum_os_version = minimum_os_version,
         platform_type = platform_type,
@@ -492,7 +462,6 @@ def _apple_platforms_rule_bundle_output_base_transition_impl(settings, attr):
         environment_arch = _environment_archs(platform_type, settings)[0]
     return _command_line_options(
         apple_platforms = settings["//command_line_option:apple_platforms"],
-        emit_swiftinterface = _should_emit_swiftinterface(attr),
         environment_arch = environment_arch,
         force_bundle_outputs = True,
         minimum_os_version = minimum_os_version,
@@ -569,11 +538,6 @@ def _apple_platform_split_transition_impl(settings, attr):
     output_dictionary = {}
     invalid_requested_archs = []
 
-    # iOS and tvOS static frameworks require underlying swift_library targets generate a Swift
-    # interface file. These rules define a private attribute called `_emitswiftinterface` that
-    # let's this transition flip rules_swift config down the build graph.
-    emit_swiftinterface = _should_emit_swiftinterface(attr)
-
     if settings["//command_line_option:incompatible_enable_apple_toolchain_resolution"]:
         platforms = (
             settings["//command_line_option:apple_platforms"] or
@@ -594,7 +558,6 @@ def _apple_platform_split_transition_impl(settings, attr):
             if str(platform) not in output_dictionary:
                 output_dictionary[str(platform)] = _command_line_options(
                     apple_platforms = apple_platforms,
-                    emit_swiftinterface = emit_swiftinterface,
                     minimum_os_version = attr.minimum_os_version,
                     platform_type = attr.platform_type,
                     settings = settings,
@@ -643,7 +606,6 @@ def _apple_platform_split_transition_impl(settings, attr):
                 continue
 
             output_dictionary[found_cpu] = _command_line_options(
-                emit_swiftinterface = emit_swiftinterface,
                 environment_arch = environment_arch,
                 minimum_os_version = minimum_os_version,
                 platform_type = platform_type,
@@ -694,7 +656,6 @@ def _xcframework_transition_impl(settings, attr):
             target_environments.append("simulator")
 
         command_line_options = _command_line_options_for_xcframework_platform(
-            attr = attr,
             minimum_os_version = attr.minimum_os_versions.get(platform_type),
             platform_attr = platform_attr,
             platform_type = platform_type,