Force swift.compile_in_parallel in the tests that depend on looking up specific mnemonics.

Updates test using the `//test/fixtures/debug_settings:simple` target to check for parallel compilation mnemonic. NOTE: we dont seem to support batch mode correctly when parallel compilation is used without WMO

Cherry-pick: 080e111

Author: luispadron

swift/internal/compiling.bzl

@@ -770,13 +770,20 @@ def _should_plan_parallel_compilation(
         feature_name = SWIFT_FEATURE_COMPILE_IN_PARALLEL,
     )
 
+    # TODO: are we able to support split derived file generation in parallel, this feature is not in upstream.
+    # For now, force non-parallel compilation when split derived file generation is enabled.
+    split_derived_file_generation = is_feature_enabled(
+        feature_configuration = feature_configuration,
+        feature_name = SWIFT_FEATURE_SPLIT_DERIVED_FILES_GENERATION,
+    )
+
     # The Swift driver will not emit separate jobs to compile the module and to
     # perform codegen if optimization is requested. See
     # https://github.com/swiftlang/swift-driver/blob/c647e91574122f2b104d294ab1ec5baadaa1aa95/Sources/SwiftDriver/Jobs/EmitModuleJob.swift#L156-L181.
     opt_requested = is_optimization_manually_requested(
         user_compile_flags = user_compile_flags,
     )
-    return parallel_requested and not opt_requested
+    return parallel_requested and not opt_requested and not split_derived_file_generation
 
 def _execute_compile_plan(
         actions,

test/fixtures/debug_settings/BUILD

@@ -23,3 +23,11 @@ swift_library(
     ],
     tags = FIXTURE_TAGS,
 )
+
+# TODO: The `default_no_split_args` split_derived_files_generation is not supported in parallel.
+# We need to handle falling back to non-parallel compilation when this feature is enabled, but dont currently.
+swift_library(
+    name = "simple_batch_mode",
+    srcs = ["Empty.swift"],
+    tags = FIXTURE_TAGS,
+)

test/split_derived_files_tests.bzl

@@ -138,14 +138,14 @@ def split_derived_files_test_suite(name, tags = []):
             "-emit-module-path",
             "-emit-object",
             "-enable-batch-mode",
-            "simple.output_file_map.json",
+            "simple_batch_mode.output_file_map.json",
         ],
         not_expected_argv = [
-            "simple.derived_output_file_map.json",
+            "simple_batch_mode.derived_output_file_map.json",
         ],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         tags = all_tags,
-        target_under_test = "//test/fixtures/debug_settings:simple",
+        target_under_test = "//test/fixtures/debug_settings:simple_batch_mode",
     )
 
     default_no_split_provider_test(
@@ -278,7 +278,7 @@ def split_derived_files_test_suite(name, tags = []):
             "-enable-batch-mode",
             "simple.output_file_map.json",
         ],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         not_expected_argv = [
             "-emit-module-path",
             "simple.derived_output_file_map.json",
@@ -344,7 +344,7 @@ def split_derived_files_test_suite(name, tags = []):
             "-emit-object",
             "-whole-module-optimization",
         ],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         not_expected_argv = [
             "-emit-module-path",
         ],
@@ -406,7 +406,7 @@ def split_derived_files_test_suite(name, tags = []):
         expected_argv = [
             "-emit-object",
         ],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         not_expected_argv = [
             "-experimental-skip-non-inlinable-function-bodies",
         ],
@@ -433,7 +433,7 @@ def split_derived_files_test_suite(name, tags = []):
             "-emit-object",
             "-index-store-path",
         ],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         not_expected_argv = [
             "-emit-module-path",
         ],
@@ -458,7 +458,7 @@ def split_derived_files_test_suite(name, tags = []):
     split_swiftmodule_bitcode_test(
         name = "{}_bitcode_compile".format(name),
         expected_argv = ["-emit-bc"],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         tags = all_tags,
         target_under_test = "//test/fixtures/debug_settings:simple",
     )
@@ -480,7 +480,7 @@ def split_derived_files_test_suite(name, tags = []):
             "-Xcc -DWORLD=1",
         ],
         target_compatible_with = ["@platforms//os:macos"],
-        mnemonic = "SwiftCompileModule",
+        mnemonic = "SwiftCompile",
         tags = all_tags,
         target_under_test = "//test/fixtures/debug_settings:simple",
     )