diff --git a/tools/gn2bp/Android.bp.swp b/tools/gn2bp/Android.bp.swp
index 02ce3fd..9e183fe 100644
--- a/tools/gn2bp/Android.bp.swp
+++ b/tools/gn2bp/Android.bp.swp
@@ -166,9 +166,9 @@
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/android_ndk/sources/android/cpufeatures/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
     arch: {
@@ -191,12 +191,9 @@
                 "base/allocator/partition_allocator/partition_alloc_base/check.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/cpu.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/debug/alias.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/files/file_path.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/files/file_util_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/logging.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/memory/ref_counted.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/native_library.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/native_library_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/pkey.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/posix/safe_strerror.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/rand_util.cc",
@@ -205,7 +202,6 @@
                 "base/allocator/partition_allocator/partition_alloc_base/threading/platform_thread.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/threading/platform_thread_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/time/time_android.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_conversion_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_now_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_override.cc",
@@ -250,12 +246,9 @@
                 "base/allocator/partition_allocator/partition_alloc_base/check.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/cpu.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/debug/alias.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/files/file_path.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/files/file_util_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/logging.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/memory/ref_counted.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/native_library.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/native_library_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/pkey.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/posix/safe_strerror.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/rand_util.cc",
@@ -264,7 +257,6 @@
                 "base/allocator/partition_allocator/partition_alloc_base/threading/platform_thread.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/threading/platform_thread_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time.cc",
-                "base/allocator/partition_allocator/partition_alloc_base/time/time_android.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_conversion_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_now_posix.cc",
                 "base/allocator/partition_allocator/partition_alloc_base/time/time_override.cc",
@@ -494,71 +486,11 @@
         "base/allocator/dispatcher/internal/dispatch_data.cc",
         "base/allocator/dispatcher/reentry_guard.cc",
         "base/allocator/partition_allocator/shim/allocator_shim.cc",
-        "base/allocator/partition_allocator/shim/allocator_shim_default_dispatch_to_glibc.cc",
-        "base/allocator/partition_allocator/shim/allocator_shim_default_dispatch_to_linker_wrapped_symbols.cc",
-        "base/android/android_hardware_buffer_compat.cc",
-        "base/android/android_image_reader_compat.cc",
-        "base/android/apk_assets.cc",
-        "base/android/application_status_listener.cc",
-        "base/android/base_feature_list.cc",
-        "base/android/base_features.cc",
-        "base/android/base_jni_onload.cc",
-        "base/android/build_info.cc",
-        "base/android/bundle_utils.cc",
-        "base/android/callback_android.cc",
-        "base/android/child_process_service.cc",
-        "base/android/command_line_android.cc",
-        "base/android/content_uri_utils.cc",
-        "base/android/cpu_features.cc",
-        "base/android/early_trace_event_binding.cc",
-        "base/android/event_log.cc",
-        "base/android/feature_list_jni.cc",
-        "base/android/features_jni.cc",
-        "base/android/field_trial_list.cc",
-        "base/android/important_file_writer_android.cc",
-        "base/android/int_string_callback.cc",
-        "base/android/jank_metric_uma_recorder.cc",
-        "base/android/java_exception_reporter.cc",
-        "base/android/java_handler_thread.cc",
-        "base/android/java_heap_dump_generator.cc",
-        "base/android/java_runtime.cc",
-        "base/android/jni_android.cc",
-        "base/android/jni_array.cc",
-        "base/android/jni_registrar.cc",
-        "base/android/jni_string.cc",
-        "base/android/jni_utils.cc",
-        "base/android/jni_weak_ref.cc",
-        "base/android/library_loader/anchor_functions.cc",
-        "base/android/library_loader/library_loader_hooks.cc",
-        "base/android/library_loader/library_prefetcher.cc",
-        "base/android/library_loader/library_prefetcher_hooks.cc",
-        "base/android/locale_utils.cc",
-        "base/android/memory_pressure_listener_android.cc",
-        "base/android/native_uma_recorder.cc",
-        "base/android/path_service_android.cc",
-        "base/android/path_utils.cc",
-        "base/android/radio_utils.cc",
-        "base/android/reached_addresses_bitset.cc",
-        "base/android/reached_code_profiler_stub.cc",
-        "base/android/remove_stale_data.cc",
-        "base/android/scoped_hardware_buffer_fence_sync.cc",
-        "base/android/scoped_hardware_buffer_handle.cc",
-        "base/android/scoped_java_ref.cc",
-        "base/android/statistics_recorder_android.cc",
-        "base/android/sys_utils.cc",
-        "base/android/task_scheduler/post_task_android.cc",
-        "base/android/task_scheduler/task_runner_android.cc",
-        "base/android/thread_instruction_count.cc",
-        "base/android/timezone_utils.cc",
-        "base/android/trace_event_binding.cc",
-        "base/android/unguessable_token_android.cc",
         "base/at_exit.cc",
         "base/barrier_closure.cc",
         "base/base64.cc",
         "base/base64url.cc",
         "base/base_paths.cc",
-        "base/base_paths_android.cc",
-        "base/base_paths_posix.cc",
         "base/big_endian.cc",
         "base/build_time.cc",
         "base/callback_list.cc",
@@ -585,8 +517,6 @@
         "base/debug/proc_maps_linux.cc",
         "base/debug/profiler.cc",
         "base/debug/stack_trace.cc",
-        "base/debug/stack_trace_android.cc",
-        "base/debug/stack_trace_posix.cc",
         "base/debug/task_trace.cc",
         "base/environment.cc",
         "base/feature_list.cc",
@@ -604,8 +534,6 @@
         "base/files/file_proxy.cc",
         "base/files/file_tracing.cc",
         "base/files/file_util.cc",
-        "base/files/file_util_android.cc",
-        "base/files/file_util_linux.cc",
         "base/files/file_util_posix.cc",
         "base/files/important_file_writer.cc",
         "base/files/important_file_writer_cleaner.cc",
@@ -613,8 +541,6 @@
         "base/files/memory_mapped_file_posix.cc",
         "base/files/safe_base_name.cc",
         "base/files/scoped_file.cc",
-        "base/files/scoped_file_android.cc",
-        "base/files/scoped_file_linux.cc",
         "base/files/scoped_temp_dir.cc",
         "base/functional/callback_helpers.cc",
         "base/functional/callback_internal.cc",
@@ -646,11 +572,7 @@
         "base/memory/nonscannable_memory.cc",
         "base/memory/page_size_posix.cc",
         "base/memory/platform_shared_memory_handle.cc",
-        "base/memory/platform_shared_memory_mapper_android.cc",
-        "base/memory/platform_shared_memory_mapper_posix.cc",
         "base/memory/platform_shared_memory_region.cc",
-        "base/memory/platform_shared_memory_region_android.cc",
-        "base/memory/platform_shared_memory_region_posix.cc",
         "base/memory/raw_ptr.cc",
         "base/memory/raw_ptr_asan_bound_arg_tracker.cc",
         "base/memory/raw_ptr_asan_service.cc",
@@ -666,7 +588,6 @@
         "base/memory/weak_ptr.cc",
         "base/memory/writable_shared_memory_region.cc",
         "base/message_loop/message_pump.cc",
-        "base/message_loop/message_pump_android.cc",
         "base/message_loop/message_pump_default.cc",
         "base/message_loop/message_pump_epoll.cc",
         "base/message_loop/message_pump_libevent.cc",
@@ -698,13 +619,10 @@
         "base/metrics/user_metrics.cc",
         "base/native_library.cc",
         "base/native_library_posix.cc",
-        "base/nix/mime_util_xdg.cc",
-        "base/nix/xdg_util.cc",
         "base/observer_list_internal.cc",
         "base/observer_list_threadsafe.cc",
         "base/observer_list_types.cc",
         "base/one_shot_event.cc",
-        "base/os_compat_android.cc",
         "base/path_service.cc",
         "base/pending_task.cc",
         "base/pickle.cc",
@@ -718,8 +636,6 @@
         "base/power_monitor/moving_average.cc",
         "base/power_monitor/power_monitor.cc",
         "base/power_monitor/power_monitor_device_source.cc",
-        "base/power_monitor/power_monitor_device_source_android.cc",
-        "base/power_monitor/power_monitor_device_source_stub.cc",
         "base/power_monitor/power_monitor_features.cc",
         "base/power_monitor/power_monitor_source.cc",
         "base/power_monitor/sampling_event_source.cc",
@@ -732,13 +648,11 @@
         "base/process/launch_posix.cc",
         "base/process/memory.cc",
         "base/process/memory_linux.cc",
-        "base/process/process_android.cc",
         "base/process/process_handle.cc",
         "base/process/process_handle_linux.cc",
         "base/process/process_handle_posix.cc",
         "base/process/process_iterator.cc",
         "base/process/process_iterator_linux.cc",
-        "base/process/process_linux.cc",
         "base/process/process_metrics.cc",
         "base/process/process_metrics_linux.cc",
         "base/process/process_metrics_posix.cc",
@@ -756,9 +670,7 @@
         "base/profiler/stack_copier_signal.cc",
         "base/profiler/stack_copier_suspend.cc",
         "base/profiler/stack_sampler.cc",
-        "base/profiler/stack_sampler_android.cc",
         "base/profiler/stack_sampler_impl.cc",
-        "base/profiler/stack_sampler_posix.cc",
         "base/profiler/stack_sampling_profiler.cc",
         "base/profiler/thread_delegate_posix.cc",
         "base/profiler/unwinder.cc",
@@ -774,7 +686,6 @@
         "base/sequence_checker.cc",
         "base/sequence_checker_impl.cc",
         "base/sequence_token.cc",
-        "base/stack_canary_linux.cc",
         "base/strings/abseil_string_conversions.cc",
         "base/strings/abseil_string_number_conversions.cc",
         "base/strings/escape.cc",
@@ -805,7 +716,6 @@
         "base/synchronization/waitable_event_watcher_posix.cc",
         "base/syslog_logging.cc",
         "base/system/sys_info.cc",
-        "base/system/sys_info_android.cc",
         "base/system/sys_info_linux.cc",
         "base/system/sys_info_posix.cc",
         "base/system/system_monitor.cc",
@@ -884,9 +794,7 @@
         "base/third_party/superfasthash/superfasthash.c",
         "base/threading/hang_watcher.cc",
         "base/threading/platform_thread.cc",
-        "base/threading/platform_thread_android.cc",
         "base/threading/platform_thread_internal_posix.cc",
-        "base/threading/platform_thread_linux.cc",
         "base/threading/platform_thread_posix.cc",
         "base/threading/platform_thread_ref.cc",
         "base/threading/post_task_and_reply_impl.cc",
@@ -912,7 +820,6 @@
         "base/time/default_tick_clock.cc",
         "base/time/tick_clock.cc",
         "base/time/time.cc",
-        "base/time/time_android.cc",
         "base/time/time_conversion_posix.cc",
         "base/time/time_delta_from_string.cc",
         "base/time/time_exploded_icu.cc",
@@ -1063,9 +970,9 @@
         "third_party/boringssl/src/include/",
         "third_party/icu/source/common/",
         "third_party/icu/source/i18n/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     header_libs: [
         "jni_headers",
@@ -1382,9 +1289,9 @@
         "buildtools/third_party/libc++/",
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -1712,9 +1619,9 @@
         "buildtools/third_party/libc++/",
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -1755,9 +1662,9 @@
         "buildtools/third_party/libc++/",
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -2051,11 +1958,9 @@
 filegroup {
     name: "cronet_aml_buildtools_third_party_libc__abi_libc__abi",
     srcs: [
-        "buildtools/third_party/libc++abi/cxa_demangle_stub.cc",
         "buildtools/third_party/libc++abi/trunk/src/abort_message.cpp",
         "buildtools/third_party/libc++abi/trunk/src/cxa_aux_runtime.cpp",
         "buildtools/third_party/libc++abi/trunk/src/cxa_default_handlers.cpp",
-        "buildtools/third_party/libc++abi/trunk/src/cxa_demangle.cpp",
         "buildtools/third_party/libc++abi/trunk/src/cxa_exception.cpp",
         "buildtools/third_party/libc++abi/trunk/src/cxa_exception_storage.cpp",
         "buildtools/third_party/libc++abi/trunk/src/cxa_guard.cpp",
@@ -2644,8 +2549,6 @@
         "crypto/encryptor.cc",
         "crypto/hkdf.cc",
         "crypto/hmac.cc",
-        "crypto/nss_key_util.cc",
-        "crypto/nss_util.cc",
         "crypto/openssl_util.cc",
         "crypto/p224_spake.cc",
         "crypto/random.cc",
@@ -2725,9 +2628,9 @@
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/abseil-cpp/",
         "third_party/boringssl/src/include/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -5260,9 +5163,9 @@
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/boringssl/src/include/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
     arch: {
@@ -5844,19 +5747,6 @@
 filegroup {
     name: "cronet_aml_third_party_boringssl_boringssl_asm_x86",
     srcs: [
-        "third_party/boringssl/linux-x86/crypto/chacha/chacha-x86.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/aesni-x86.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/bn-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/co-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/ghash-ssse3-x86.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/ghash-x86.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/md5-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/sha1-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/sha256-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/sha512-586.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/vpaes-x86.S",
-        "third_party/boringssl/linux-x86/crypto/fipsmodule/x86-mont.S",
-        "third_party/boringssl/linux-x86/crypto/test/trampoline-x86.S",
         "third_party/boringssl/linux-x86_64/crypto/chacha/chacha-x86_64.S",
         "third_party/boringssl/linux-x86_64/crypto/cipher_extra/aes128gcmsiv-x86_64.S",
         "third_party/boringssl/linux-x86_64/crypto/cipher_extra/chacha20_poly1305_x86_64.S",
@@ -6269,9 +6159,9 @@
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/icu/source/common/",
         "third_party/icu/source/i18n/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
     rtti: true,
@@ -6529,9 +6419,9 @@
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/icu/source/common/",
         "third_party/icu/source/i18n/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
     rtti: true,
@@ -6594,9 +6484,9 @@
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/libevent/android/",
         "third_party/libevent/linux/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -6778,9 +6668,9 @@
         "buildtools/third_party/libc++/",
         "buildtools/third_party/libc++/trunk/include",
         "buildtools/third_party/libc++abi/trunk/include",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
@@ -6853,9 +6743,9 @@
         "buildtools/third_party/libc++abi/trunk/include",
         "third_party/android_ndk/sources/android/cpufeatures/",
         "third_party/zlib/",
-        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include/x86_64-linux-gnu",
         "build/linux/debian_bullseye_amd64-sysroot/usr/include",
+        "third_party/android_ndk/toolchains/llvm/prebuilt/linux-x86_64/sysroot/usr/include",
     ],
     cpp_std: "c++20",
 }
diff --git a/tools/gn2bp/gn_utils.py b/tools/gn2bp/gn_utils.py
index 86f9f74..b3cda41 100644
--- a/tools/gn2bp/gn_utils.py
+++ b/tools/gn2bp/gn_utils.py
@@ -185,10 +185,6 @@
         return
       self.is_finalized = True
 
-      # TODO: temporary hack until sources are collected on a per arch basis.
-      if self.sources:
-        return
-
       # Target contains the intersection of arch-dependent properties
       self.sources = set.intersection(*[arch.sources for arch in self.arch.values()])
 
@@ -285,18 +281,18 @@
       target.proto_paths.update(self.get_proto_paths(proto_desc))
       target.proto_exports.update(self.get_proto_exports(proto_desc))
       target.proto_in_dir = self.get_proto_in_dir(proto_desc)
-      target.sources.update(proto_desc.get('sources', []))
-      assert (all(x.endswith('.proto') for x in target.sources))
+      target.arch[arch].sources.update(proto_desc.get('sources', []))
+      assert (all(x.endswith('.proto') for x in target.arch[arch].sources))
     elif target.type == 'source_set':
       self.source_sets[gn_target_name] = target
-      target.sources.update(desc.get('sources', []))
+      target.arch[arch].sources.update(desc.get('sources', []))
     elif target.type in LINKER_UNIT_TYPES:
       self.linker_units[gn_target_name] = target
-      target.sources.update(desc.get('sources', []))
+      target.arch[arch].sources.update(desc.get('sources', []))
     elif target.type in ['action', 'action_foreach']:
       self.actions[gn_target_name] = target
       target.inputs.update(desc.get('inputs', []))
-      target.sources.update(desc.get('sources', []))
+      target.arch[arch].sources.update(desc.get('sources', []))
       outs = [re.sub('^//out/.+?/gen/', '', x) for x in desc['outputs']]
       target.outputs.update(outs)
       target.script = desc['script']