Adopt Xcode 12 for podspec lints

Author: jmagman

.cirrus.yml

@@ -206,29 +206,6 @@ task:
         # This UI change sometimes affects `xctest`.
         # So we run `drive-examples` after `xctest`, changing the order will result ci failure.
         - ./script/incremental_build.sh drive-examples --ios
-
-task:
-  # Xcode 11 task
-  # TODO(cyanglaz): merge Xcode 11 task to Xcode 12 task when all the matrix can be run in Xcode 12.
-  # don't run on release tags since it creates O(n^2) tasks where n is the number of plugins
-  only_if: $CIRRUS_TAG == ''
-  use_compute_credits: $CIRRUS_USER_COLLABORATOR == 'true'
-  osx_instance:
-    image: catalina-xcode-11.3.1-flutter
-  upgrade_script:
-    - sudo gem install cocoapods
-    - flutter channel stable
-    - flutter upgrade
-    - flutter channel master
-    - flutter upgrade
-    - git fetch origin master
-  submodules_script:
-    - git submodule init
-    - git submodule update
-  create_simulator_script:
-    - xcrun simctl list
-    - xcrun simctl create Flutter-iPhone com.apple.CoreSimulator.SimDeviceType.iPhone-X com.apple.CoreSimulator.SimRuntime.iOS-13-3 | xargs xcrun simctl boot
-  matrix:
     - name: lint_darwin_plugins
       env:
         matrix:

script/tool/lib/src/lint_podspecs_command.dart

@@ -135,6 +135,7 @@ class LintPodspecsCommand extends PluginCommand {
       'lib',
       'lint',
       podspecPath,
+      '--configuration=Debug', // Release targets unsupported arm64 simulators. Use Debug to only build against targeted x86_64 simulator devices.
       if (allowWarnings) '--allow-warnings',
       if (runAnalyzer) '--analyze',
       if (libraryLint) '--use-libraries'