Set BUILD_DIR when determining if plugins support arm64 simulators (#90088)

dev/devicelab/bin/tasks/plugin_lint_mac.dart

@@ -499,6 +499,13 @@ void _validateIosPodfile(String appPath) {
     'test_plugin_swift',
     'ios',
   ));
+
+  // Make sure no Xcode build settings are leaking derived data/build directory into the ios directory.
+  checkDirectoryNotExists(path.join(
+    appPath,
+    'ios',
+    'build',
+  ));
 }
 
 void _validateMacOSPodfile(String appPath) {

packages/flutter_tools/lib/src/ios/xcodeproj.dart

@@ -228,6 +228,7 @@ class XcodeProjectInterpreter {
       return null;
     }
     final Status status = _logger.startSpinner();
+    final String buildDirectory = _fileSystem.path.absolute(getIosBuildDirectory());
     final List<String> showBuildSettingsCommand = <String>[
       ...xcrunCommand(),
       'xcodebuild',
@@ -237,6 +238,8 @@ class XcodeProjectInterpreter {
       '-project',
       podXcodeProject.path,
       '-showBuildSettings',
+      'BUILD_DIR=$buildDirectory',
+      'OBJROOT=$buildDirectory',
     ];
     try {
       // showBuildSettings is reported to occasionally timeout. Here, we give it

packages/flutter_tools/templates/app_shared/ios.tmpl/.gitignore

@@ -1,3 +1,4 @@
+**/dgph
 *.mode1v3
 *.mode2v3
 *.moved-aside

packages/flutter_tools/templates/app_shared/macos.tmpl/.gitignore

@@ -3,4 +3,5 @@
 **/Pods/
 
 # Xcode-related
+**/dgph
 **/xcuserdata/

packages/flutter_tools/test/general.shard/ios/xcodeproj_test.dart

@@ -695,6 +695,7 @@ Information about project "Runner":
         final Directory podXcodeProject = project.ios.hostAppRoot.childDirectory('Pods').childDirectory('Pods.xcodeproj')
           ..createSync(recursive: true);
 
+        final String buildDirectory = fileSystem.path.absolute('build', 'ios');
         fakeProcessManager.addCommands(<FakeCommand>[
           kWhichSysctlCommand,
           kARMCheckCommand,
@@ -710,6 +711,8 @@ Information about project "Runner":
               '-project',
               podXcodeProject.path,
               '-showBuildSettings',
+              'BUILD_DIR=$buildDirectory',
+              'OBJROOT=$buildDirectory',
             ],
             stdout: '''
 Build settings for action build and target plugin1:
@@ -748,6 +751,7 @@ Build settings for action build and target plugin2:
         final Directory podXcodeProject = project.ios.hostAppRoot.childDirectory('Pods').childDirectory('Pods.xcodeproj')
           ..createSync(recursive: true);
 
+        final String buildDirectory = fileSystem.path.absolute('build', 'ios');
         fakeProcessManager.addCommands(<FakeCommand>[
           kWhichSysctlCommand,
           kARMCheckCommand,
@@ -763,6 +767,8 @@ Build settings for action build and target plugin2:
                 '-project',
                 podXcodeProject.path,
                 '-showBuildSettings',
+                'BUILD_DIR=$buildDirectory',
+                'OBJROOT=$buildDirectory',
               ],
               exitCode: 1,
           ),
@@ -789,6 +795,7 @@ Build settings for action build and target plugin2:
         final Directory podXcodeProject = project.ios.hostAppRoot.childDirectory('Pods').childDirectory('Pods.xcodeproj')
           ..createSync(recursive: true);
 
+        final String buildDirectory = fileSystem.path.absolute('build', 'ios');
         fakeProcessManager.addCommands(<FakeCommand>[
           kWhichSysctlCommand,
           kARMCheckCommand,
@@ -804,6 +811,8 @@ Build settings for action build and target plugin2:
                 '-project',
                 podXcodeProject.path,
                 '-showBuildSettings',
+                'BUILD_DIR=$buildDirectory',
+                'OBJROOT=$buildDirectory',
               ],
               stdout: '''
 Build settings for action build and target plugin1: