[flutter_tools] simplify symbol logic for iOS (#49628)

dev/devicelab/bin/tasks/module_test_ios.dart

@@ -57,13 +57,6 @@ Future<void> main() async {
         );
       }
 
-      if (await _hasDebugSymbols(ephemeralReleaseHostApp)) {
-        return TaskResult.failure(
-          "Ephemeral host app ${ephemeralReleaseHostApp.path}'s App.framework's "
-          "debug symbols weren't stripped in release mode"
-        );
-      }
-
       section('Clean build');
 
       await inDirectory(projectDir, () async {
@@ -97,12 +90,6 @@ Future<void> main() async {
         );
       }
 
-      if (!await _hasDebugSymbols(ephemeralProfileHostApp)) {
-        return TaskResult.failure(
-          "Ephemeral host app ${ephemeralProfileHostApp.path}'s App.framework does not contain debug symbols"
-        );
-      }
-
       section('Clean build');
 
       await inDirectory(projectDir, () async {
@@ -406,26 +393,3 @@ Future<bool> _isAppAotBuild(Directory app) async {
 
   return symbolTable.contains('kDartIsolateSnapshotInstructions');
 }
-
-Future<bool> _hasDebugSymbols(Directory app) async {
-  final String binary = path.join(
-    app.path,
-    'Frameworks',
-    'App.framework',
-    'App',
-  );
-
-  final String symbolTable = await eval(
-    'dsymutil',
-    <String> [
-      '--dump-debug-map',
-      binary,
-    ],
-    // The output is huge.
-    printStdout: false,
-  );
-
-  // Search for some random Flutter framework Dart function which should always
-  // be in App.framework.
-  return symbolTable.contains('BuildOwner_reassemble');
-}

packages/flutter_tools/bin/xcode_backend.sh

@@ -201,30 +201,6 @@ BuildApp() {
 
     RunCommand cp -r -- "${app_framework}" "${derived_dir}"
 
-    if [[ "${build_mode}" == "release" ]]; then
-      StreamOutput " ├─Generating dSYM file..."
-      # Xcode calls `symbols` during app store upload, which uses Spotlight to
-      # find dSYM files for embedded frameworks. When it finds the dSYM file for
-      # `App.framework` it throws an error, which aborts the app store upload.
-      # To avoid this, we place the dSYM files in a folder ending with ".noindex",
-      # which hides it from Spotlight, https://github.com/flutter/flutter/issues/22560.
-      RunCommand mkdir -p -- "${build_dir}/dSYMs.noindex"
-      RunCommand xcrun dsymutil -o "${build_dir}/dSYMs.noindex/App.framework.dSYM" "${app_framework}/App"
-      if [[ $? -ne 0 ]]; then
-        EchoError "Failed to generate debug symbols (dSYM) file for ${app_framework}/App."
-        exit -1
-      fi
-      StreamOutput "done"
-
-      StreamOutput " ├─Stripping debug symbols..."
-      RunCommand xcrun strip -x -S "${derived_dir}/App.framework/App"
-      if [[ $? -ne 0 ]]; then
-        EchoError "Failed to strip ${derived_dir}/App.framework/App."
-        exit -1
-      fi
-      StreamOutput "done"
-    fi
-
   else
     RunCommand mkdir -p -- "${derived_dir}/App.framework"
 

packages/flutter_tools/lib/src/base/build.dart

@@ -138,11 +138,7 @@ class AOTSnapshotter {
       outputPaths.add(assembly);
       genSnapshotArgs.add('--snapshot_kind=app-aot-assembly');
       genSnapshotArgs.add('--assembly=$assembly');
-      // TODO(jonahwilliams): determine the correct time to use strip
-      // since this is required for the future dwarf strack traces option.
-      if (bitcode && buildMode == BuildMode.release) {
       genSnapshotArgs.add('--strip');
-      }
     } else {
       final String aotSharedLibrary = globals.fs.path.join(outputDir.path, 'app.so');
       outputPaths.add(aotSharedLibrary);

packages/flutter_tools/test/general.shard/base/build_test.dart

@@ -326,6 +326,7 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=$assembly',
+        '--strip',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
         '--no-causal-async-stacks',
@@ -444,6 +445,7 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=$assembly',
+        '--strip',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
         '--no-causal-async-stacks',
@@ -493,6 +495,7 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
+        '--strip',
         '--no-causal-async-stacks',
         '--lazy-async-stacks',
         'main.dill',
@@ -531,6 +534,7 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
+        '--strip',
         '--no-sim-use-hardfp',
         '--no-use-integer-division',
         '--no-causal-async-stacks',
@@ -571,6 +575,7 @@ void main() {
         '--deterministic',
         '--snapshot_kind=app-aot-assembly',
         '--assembly=${globals.fs.path.join(outputPath, 'snapshot_assembly.S')}',
+        '--strip',
         '--no-causal-async-stacks',
         '--lazy-async-stacks',
         'main.dill',