Set DEFINES_MODULE=YES in plugin templates (#41828)

dev/bots/test.dart

@@ -881,6 +881,7 @@ Future<void> _runIntegrationTests() async {
         await _runDevicelabTest('flutter_create_offline_test_windows');
       } else if (Platform.isMacOS) {
         await _runDevicelabTest('flutter_create_offline_test_mac');
+        await _runDevicelabTest('plugin_lint_mac');
 // TODO(jmagman): Re-enable once flakiness is resolved.
 //        await _runDevicelabTest('module_test_ios');
       }

dev/devicelab/bin/tasks/plugin_lint_mac.dart

+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/framework/utils.dart';
+import 'package:path/path.dart' as path;
+
+/// Tests that the Flutter plugin template works. Use `pod lib lint`
+/// to confirm the plugin module can be imported into an app.
+Future<void> main() async {
+  await task(() async {
+    section('Create Objective-C iOS plugin');
+
+    final Directory tempDir = Directory.systemTemp.createTempSync('flutter_plugin_test.');
+    try {
+      const String objcPluginName = 'test_plugin_objc';
+      await inDirectory(tempDir, () async {
+        await flutter(
+          'create',
+          options: <String>[
+            '--org',
+            'io.flutter.devicelab',
+            '--template=plugin',
+            '--ios-language=objc',
+            objcPluginName,
+          ],
+        );
+      });
+
+      final String objcPodspecPath = path.join(tempDir.path, objcPluginName, 'ios', '$objcPluginName.podspec');
+      section('Lint Objective-C iOS plugin as framework');
+      await inDirectory(tempDir, () async {
+        await exec(
+          'pod',
+          <String>[
+            'lib',
+            'lint',
+            objcPodspecPath,
+            '--allow-warnings',
+          ],
+        );
+      });
+
+      section('Lint Objective-C iOS plugin as library');
+      await inDirectory(tempDir, () async {
+        await exec(
+          'pod',
+          <String>[
+            'lib',
+            'lint',
+            objcPodspecPath,
+            '--allow-warnings',
+            '--use-libraries',
+          ],
+        );
+      });
+
+      return TaskResult.success(null);
+    } catch (e) {
+      return TaskResult.failure(e.toString());
+    } finally {
+      rmTree(tempDir);
+    }
+  });
+}

packages/flutter_tools/templates/plugin/ios.tmpl/projectName.podspec.tmpl

 #
-# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint {{projectName}}.podspec' to validate before publishing.
 #
 Pod::Spec.new do |s|
   s.name             = '{{projectName}}'
@@ -15,7 +16,8 @@ Pod::Spec.new do |s|
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
+  s.platform = :ios, '8.0'
 
-  s.ios.deployment_target = '8.0'
+  # Flutter.framework does not contain a i386 slice. Only x86_64 simulators are supported.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }
 end
-

packages/flutter_tools/templates/plugin/macos.tmpl/projectName.podspec.tmpl

 #
-# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint {{projectName}}.podspec' to validate before publishing.
 #
 Pod::Spec.new do |s|
   s.name             = '{{projectName}}'
@@ -15,7 +16,6 @@ Pod::Spec.new do |s|
   s.source_files     = 'Classes/**/*'
   s.dependency 'FlutterMacOS'
 
-  s.platform = :osx
-  s.osx.deployment_target = '10.11'
+  s.platform = :osx, '10.11'
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
 end
-