Filter out some stray Xcode logging during macOS builds (#100707)

packages/flutter_tools/lib/src/macos/build_macos.dart

@@ -16,9 +16,13 @@ import '../project.dart';
 import 'cocoapod_utils.dart';
 import 'migrations/remove_macos_framework_link_and_embedding_migration.dart';
 
-/// When run in -quiet mode, Xcode only prints from the underlying tasks to stdout.
+/// When run in -quiet mode, Xcode should only print from the underlying tasks to stdout.
 /// Passing this regexp to trace moves the stdout output to stderr.
-final RegExp _anyOutput = RegExp('.*');
+///
+/// Filter out xcodebuild logging unrelated to macOS builds:
+/// xcodebuild[2096:1927385] Requested but did not find extension point with identifier Xcode.IDEKit.ExtensionPointIdentifierToBundleIdentifier for extension Xcode.DebuggerFoundation.AppExtensionToBundleIdentifierMap.watchOS of plug-in com.apple.dt.IDEWatchSupportCore
+/// note: Using new build system
+final RegExp _filteredOutput = RegExp(r'^((?!Requested but did not find extension point with identifier|note\:).)*$');
 
 /// Builds the macOS project through xcodebuild.
 // TODO(zanderso): refactor to share code with the existing iOS code.
@@ -113,7 +117,8 @@ Future<void> buildMacOS({
       ...environmentVariablesAsXcodeBuildSettings(globals.platform)
     ],
     trace: true,
-    stdoutErrorMatcher: verboseLogging ? null : _anyOutput,
+    stdoutErrorMatcher: verboseLogging ? null : _filteredOutput,
+    mapFunction: verboseLogging ? null : (String line) => _filteredOutput.hasMatch(line) ? line : null,
   );
   } finally {
     status.cancel();

packages/flutter_tools/test/commands.shard/hermetic/build_macos_test.dart

@@ -113,7 +113,18 @@ void main() {
           '-quiet',
         'COMPILER_INDEX_STORE_ENABLE=NO',
       ],
-      stdout: 'STDOUT STUFF',
+      stdout: '''
+STDOUT STUFF
+note: Using new build system
+note: Planning
+note: Build preparation complete
+note: Building targets in dependency order
+''',
+        stderr: '''
+2022-03-24 10:07:21.954 xcodebuild[2096:1927385] Requested but did not find extension point with identifier Xcode.IDEKit.ExtensionSentinelHostApplications for extension Xcode.DebuggerFoundation.AppExtensionHosts.watchOS of plug-in com.apple.dt.IDEWatchSupportCore
+2022-03-24 10:07:21.954 xcodebuild[2096:1927385] Requested but did not find extension point with identifier Xcode.IDEKit.ExtensionPointIdentifierToBundleIdentifier for extension Xcode.DebuggerFoundation.AppExtensionToBundleIdentifierMap.watchOS of plug-in com.apple.dt.IDEWatchSupportCore
+STDERR STUFF
+''',
       onRun: () {
         fileSystem.file(fileSystem.path.join('macos', 'Flutter', 'ephemeral', '.app_filename'))
           ..createSync(recursive: true)
@@ -183,6 +194,11 @@ void main() {
     expect(testLogger.statusText, isNot(contains('STDOUT STUFF')));
     expect(testLogger.traceText, isNot(contains('STDOUT STUFF')));
     expect(testLogger.errorText, contains('STDOUT STUFF'));
+    expect(testLogger.errorText, contains('STDERR STUFF'));
+    // Filters out some xcodebuild logging spew.
+    expect(testLogger.errorText, isNot(contains('xcodebuild[2096:1927385]')));
+    expect(testLogger.errorText, isNot(contains('Using new build system')));
+    expect(testLogger.errorText, isNot(contains('Building targets in dependency order')));
   }, overrides: <Type, Generator>{
     FileSystem: () => fileSystem,
     ProcessManager: () => FakeProcessManager.list(<FakeCommand>[