Fix tests after rebase

swift/internal/compiling.bzl

@@ -1592,6 +1592,8 @@ def _collect_clang_module_inputs(
             # use include scanning from Starlark, we can't compute a more
             # precise input set.
             compilation_context = clang_module.compilation_context
+            if not compilation_context:
+                continue
             transitive_inputs.append(compilation_context.headers)
             transitive_inputs.append(
                 depset(compilation_context.direct_textual_headers),

swift/internal/swift_clang_module_aspect.bzl

@@ -587,7 +587,9 @@ def _handle_module(
         else:
             return []
 
-    compilation_contexts_to_merge_for_compilation = [compilation_context]
+    compilation_contexts_to_merge_for_compilation = []
+    if compilation_context:
+        compilation_contexts_to_merge_for_compilation.append(compilation_context)
 
     # Fold the `strict_includes` from `apple_common.Objc` into the Clang module
     # descriptor in `SwiftInfo` so that the `Objc` provider doesn't have to be

swift/internal/utils.bzl

@@ -110,7 +110,6 @@ def compilation_context_for_explicit_module_compilation(
                             includes = clang.strict_includes,
                         ),
                     )
-
     return cc_common.merge_compilation_contexts(
         compilation_contexts = all_compilation_contexts,
     )

test/explicit_modules_test.bzl

@@ -52,40 +52,6 @@ def explicit_modules_test_suite(name):
         target_compatible_with = ["@platforms//os:macos"],
     )
 
-    # Verify that the swift_c_module precompiles.
-    explicit_modules_action_command_line_test(
-        name = "{}_enabled_c_module_side".format(name),
-        expected_argv = [
-            "-fsystem-module",
-            "-module-name SwiftShims",
-            "-emit-pcm",
-            "-fno-implicit-module-maps",
-            "-fno-implicit-modules",
-        ],
-        mnemonic = "SwiftPrecompileCModule",
-        tags = [name],
-        target_under_test = "@build_bazel_rules_swift//test/fixtures/explicit_modules:shims",
-        target_compatible_with = ["@platforms//os:macos"],
-    )
-
-    # Verify that a swift_c_module with dependencies precompiles.
-    explicit_modules_action_command_line_test(
-        name = "{}_enabled_c_module_deps".format(name),
-        expected_argv = [
-            "-fsystem-module",
-            "-fmodule-file=_Builtin_stddef_max_align_t",
-            "-fmodule-map-file=__BAZEL_XCODE_DEVELOPER_DIR__/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/clang/include/module.modulemap",
-            "-module-name Darwin",
-            "-emit-pcm",
-            "-fno-implicit-module-maps",
-            "-fno-implicit-modules",
-        ],
-        mnemonic = "SwiftPrecompileCModule",
-        tags = [name],
-        target_under_test = "@build_bazel_rules_swift//test/fixtures/explicit_modules:Darwin",
-        target_compatible_with = ["@platforms//os:macos"],
-    )
-
     # Verify that the default behavior isn't impacted.
     implicit_modules_action_command_line_test(
         name = "{}_disabled_test".format(name),

test/fixtures/explicit_modules/BUILD

@@ -1,4 +1,4 @@
-load("//swift:swift.bzl", "swift_c_module", "swift_library")
+load("//swift:swift.bzl", "swift_interop_hint", "swift_library")
 load("//test/fixtures:common.bzl", "FIXTURE_TAGS")
 
 package(
@@ -17,26 +17,9 @@ swift_library(
     deps = [":shims"],
 )
 
-swift_c_module(
+swift_interop_hint(
     name = "shims",
     module_name = "SwiftShims",
-    system_module_map = "__BAZEL_XCODE_SDKROOT__/usr/lib/swift/shims/module.modulemap",
-    tags = FIXTURE_TAGS,
-)
-
-swift_c_module(
-    name = "Darwin",
-    module_name = "Darwin",
-    system_module_map = "__BAZEL_XCODE_SDKROOT__/usr/include/module.modulemap",
-    tags = FIXTURE_TAGS,
-    deps = [
-        ":_Builtin_stddef_max_align_t",
-    ],
-)
-
-swift_c_module(
-    name = "_Builtin_stddef_max_align_t",
-    module_name = "_Builtin_stddef_max_align_t",
-    system_module_map = "__BAZEL_XCODE_DEVELOPER_DIR__/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/clang/include/module.modulemap",
+    module_map = "__BAZEL_XCODE_SDKROOT__/usr/lib/swift/shims/module.modulemap",
     tags = FIXTURE_TAGS,
 )