add library_interface_uses_swiftinterface to swift_toolchain

Summary: Add a swift toolchain attribute and provider field to control if builds should use swiftinterface files or not.

Reviewed By: maxovtsin

Differential Revision: D66710273

fbshipit-source-id: 4e3fb9cbfc698b269b9bc39e158a3b8802e72502

apple/swift/swift_toolchain.bzl

@@ -57,6 +57,7 @@ def swift_toolchain_impl(ctx):
             architecture = ctx.attrs.architecture,
             compiler = cmd_args(ctx.attrs._swiftc_wrapper[RunInfo]).add(ctx.attrs.swiftc[RunInfo]),
             compiler_flags = ctx.attrs.swiftc_flags,
+            library_interface_uses_swiftinterface = ctx.attrs._library_interface_uses_swiftinterface,
             mk_swift_comp_db = ctx.attrs.make_swift_comp_db,
             mk_swift_interface = cmd_args(ctx.attrs._swiftc_wrapper[RunInfo]).add(ctx.attrs.make_swift_interface[RunInfo]),
             object_format = SwiftObjectFormat(ctx.attrs.object_format) if ctx.attrs.object_format else SwiftObjectFormat("object"),

apple/swift/swift_toolchain_types.bzl

@@ -22,6 +22,7 @@ SwiftToolchainInfo = provider(
         "can_toolchain_emit_obj_c_header_textually": provider_field(typing.Any, default = None),  # bool
         "compiler": provider_field(typing.Any, default = None),
         "compiler_flags": provider_field(typing.Any, default = None),
+        "library_interface_uses_swiftinterface": provider_field(bool),
         "mk_swift_comp_db": provider_field(typing.Any, default = None),
         "mk_swift_interface": provider_field(typing.Any, default = None),
         "object_format": provider_field(typing.Any, default = None),  # "SwiftObjectFormat"

decls/apple_rules.bzl

@@ -1032,6 +1032,10 @@ swift_toolchain = prelude_rule(
             "swiftc_flags": attrs.list(attrs.arg(), default = []),
             "swift_experimental_features": attrs.dict(key = attrs.enum(SwiftVersion), value = attrs.list(attrs.string()), sorted = False, default = _swift_version_feature_map),
             "swift_upcoming_features": attrs.dict(key = attrs.enum(SwiftVersion), value = attrs.list(attrs.string()), sorted = False, default = _swift_version_feature_map),
+            "_library_interface_uses_swiftinterface": attrs.bool(default = select({
+                "DEFAULT": False,
+                "config//features/apple:swift_library_interface_uses_swiftinterface_enabled": True,
+            })),
         }
     ),
 )