diff --git a/rules/BUILD.bazel b/rules/BUILD.bazel
index 5fbd192ae..65bfb0ef7 100644
--- a/rules/BUILD.bazel
+++ b/rules/BUILD.bazel
@@ -1,4 +1,39 @@
+
+load("@bazel_skylib//rules:common_settings.bzl", "bool_flag")
+load("@build_bazel_rules_swift//swift:swift.bzl", "swift_library")
+
+
 exports_files(
     glob(["*.bzl"]),
     visibility = ["//docs:__pkg__"],
 )
+
+genrule(
+    name = "empty",
+    outs = ["empty.swift"],
+    cmd = "touch $(OUTS)",
+)
+
+# A dummy target that enables serialize-debugging-options but only in local development,
+# so that swiftmodule paths will refer to paths on the local machine and LLDB will work.
+swift_library(
+    name = "_LocalDebugOptions",
+    srcs = [":empty"],
+    copts = [
+            "-Xfrontend",
+            "-serialize-debugging-options",
+    ],
+    module_name = "_LocalDebugOptions",
+    tags = ["no-remote"],
+    visibility = ["//visibility:public"],
+)
+
+
+bool_flag(name = "local_debug_options_enabled", build_setting_default = False)
+
+config_setting(
+    name = "local_debug_options",
+    flag_values = {
+        ":local_debug_options_enabled": "True",
+    }
+)
diff --git a/rules/app.bzl b/rules/app.bzl
index 330e6bee5..1c73d4594 100644
--- a/rules/app.bzl
+++ b/rules/app.bzl
@@ -61,9 +61,16 @@ def ios_application(name, apple_library = apple_library, **kwargs):
     application_kwargs["launch_storyboard"] = application_kwargs.pop("launch_storyboard", library.launch_screen_storyboard_name)
     application_kwargs["families"] = application_kwargs.pop("families", ["iphone", "ipad"])
 
+    local_debug_options_for_swift = []
+    if library.has_swift_sources:
+      local_debug_options_for_swift += ["@build_bazel_rules_ios//rules:_LocalDebugOptions"]
+
     rules_apple_ios_application(
         name = name,
-        deps = library.deps,
+        deps = library.deps + select({
+           "@build_bazel_rules_ios//rules:local_debug_options": local_debug_options_for_swift,
+           "//conditions:default": [],
+        }),
         infoplists = infoplists,
         **application_kwargs
     )
diff --git a/rules/library.bzl b/rules/library.bzl
index 1b65c55cf..0444c2db3 100644
--- a/rules/library.bzl
+++ b/rules/library.bzl
@@ -608,4 +608,5 @@ def apple_library(name, library_tools = {}, export_private_headers = True, names
         namespace = namespace,
         linkopts = linkopts,
         platforms = platforms,
+        has_swift_sources = (swift_sources and len(swift_sources) > 0),
     )
diff --git a/rules/test.bzl b/rules/test.bzl
index f8b456de2..11cd7c6e6 100644
--- a/rules/test.bzl
+++ b/rules/test.bzl
@@ -44,8 +44,15 @@ def ios_unit_test(name, apple_library = apple_library, **kwargs):
 
     library = apple_library(name = name, namespace_is_module_name = False, platforms = {"ios": unit_test_kwargs.get("minimum_os_version")}, **kwargs)
 
+    local_debug_options_for_swift = []
+    if library.has_swift_sources and not unit_test_kwargs.get("test_host", None):
+      local_debug_options_for_swift += ["@build_bazel_rules_ios//rules:_LocalDebugOptions"]
+
     rule(
         name = name,
-        deps = library.lib_names,
+        deps = library.lib_names + select({
+           "@build_bazel_rules_ios//rules:local_debug_options": local_debug_options_for_swift,
+           "//conditions:default": [],
+        }),
         **unit_test_kwargs
     )
diff --git a/tests/macos/xcodeproj/build.sh b/tests/macos/xcodeproj/build.sh
index 9f7031d52..1f7c68a61 100755
--- a/tests/macos/xcodeproj/build.sh
+++ b/tests/macos/xcodeproj/build.sh
@@ -4,4 +4,5 @@ cd $(dirname $0)
 
 xcodebuild -project Single-Application-Project-DirectTargetsOnly.xcodeproj -quiet
 xcodebuild -project Single-Application-Project-AllTargets.xcodeproj -quiet
-xcodebuild -project Test-Target-With-Test-Host-Project.xcodeproj -quiet
\ No newline at end of file
+xcodebuild -project Test-Target-With-Test-Host-Project.xcodeproj -quiet
+# TODO: use strings to test that absolute paths and debug-prefix-map are present in the LocalDebug.swiftmodule. Not sure if this is the right palce to do it. We could also grep out the build event text file maybe.
\ No newline at end of file
diff --git a/tools/xcodeproj_shims/build-wrapper.sh b/tools/xcodeproj_shims/build-wrapper.sh
index efa94c349..8c7e4ba08 100755
--- a/tools/xcodeproj_shims/build-wrapper.sh
+++ b/tools/xcodeproj_shims/build-wrapper.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 set -euxo pipefail
 
-$BAZEL_PATH build --experimental_execution_log_file=$BAZEL_BUILD_EXECUTION_LOG_FILENAME --build_event_text_file=$BAZEL_BUILD_EVENT_TEXT_FILENAME --build_event_publish_all_actions $1 2>&1 | $BAZEL_OUTPUT_PROCESSOR
+$BAZEL_PATH build --experimental_execution_log_file=$BAZEL_BUILD_EXECUTION_LOG_FILENAME --build_event_text_file=$BAZEL_BUILD_EVENT_TEXT_FILENAME --build_event_publish_all_actions $1 --@build_bazel_rules_ios//rules:local_debug_options_enabled 2>&1 | $BAZEL_OUTPUT_PROCESSOR