Build App and native asset frameworks for Add to App FlutterPluginRegistrant (flutter#183136)

Generates XCFrameworks for the App and any native assets and places them
with the `FlutterPluginRegistrant` Swift package.

```
├── FlutterPluginRegistrant
│   ├── Debug/Profile/Release
│   │   ├── Frameworks
│   │   │   ├── App.xcframework
│   │   │   ├── NativeAssets
│   │   │   │   ├── my_native_asset.xcframework
```

Build artifacts are stored in a `.cache` directory to make incremental
builds faster.

Fixes flutter#181209.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

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on [Discord].

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[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
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https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
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[CLA]: https://cla.developers.google.com/
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[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

Author: vashworth

packages/flutter_tools/lib/src/build_info.dart

@@ -1140,6 +1140,11 @@ const kXcodeBuildScriptValueBuild = 'build';
 /// embedding.
 const kXcodeBuildScriptValueEmbed = 'embed';
 
+/// Whether the build is originating from the `flutter build swift-package` command.
+///
+/// Expects value of "true".
+const kBuildSwiftPackage = 'BuildSwiftPackage';
+
 final Converter<String, String> _defineEncoder = utf8.encoder.fuse(base64.encoder);
 final Converter<String, String> _defineDecoder = base64.decoder.fuse(utf8.decoder);
 

packages/flutter_tools/lib/src/build_system/targets/assets.dart

@@ -108,6 +108,9 @@ Future<Depfile> copyAssets(
     }),
   };
 
+  // Suppress IconTreeShaker summary messages
+  final quiet = environment.defines[kBuildSwiftPackage] == 'true';
+
   await Future.wait<void>(
     assetEntries.entries.map<Future<void>>((MapEntry<String, AssetBundleEntry> entry) async {
       final PoolResource copyResource = await copyFilesPool.request();
@@ -152,6 +155,7 @@ Future<Depfile> copyAssets(
                 input: content.file as File,
                 outputPath: file.path,
                 relativePath: entry.key,
+                quiet: quiet,
               );
             case AssetKind.shader:
               doCopy = !await shaderCompiler.compileShader(
@@ -221,6 +225,7 @@ Future<Depfile> copyAssets(
                   input: content.file as File,
                   outputPath: file.path,
                   relativePath: entry.key,
+                  quiet: quiet,
                 )) {
                   await (content.file as File).copy(file.path);
                 }

packages/flutter_tools/lib/src/build_system/targets/darwin.dart

@@ -17,6 +17,13 @@ abstract class UnpackDarwin extends Target {
   @visibleForOverriding
   FlutterDarwinPlatform get darwinPlatform;
 
+  @override
+  Future<bool> canSkip(Environment environment) async {
+    // The `build swift-package` command copies the Flutter.xcframework separately and therefore
+    // does not need it to be done by the build system.
+    return environment.defines[kBuildSwiftPackage] == 'true';
+  }
+
   /// Copies the [framework] artifact using `rsync` to the [Environment.outputDir].
   /// Throws an error if copy fails.
   @protected

packages/flutter_tools/lib/src/build_system/targets/icon_tree_shaker.dart

@@ -164,6 +164,7 @@ class IconTreeShaker {
     required File input,
     required String outputPath,
     required String relativePath,
+    bool quiet = false,
   }) async {
     if (!enabled) {
       return false;
@@ -223,7 +224,12 @@ class IconTreeShaker {
       _logger.printError(await utf8.decodeStream(fontSubsetProcess.stderr));
       throw IconTreeShakerException._('Font subsetting failed with exit code $code.');
     }
-    _logger.printStatus(getSubsetSummaryMessage(input, _fs.file(outputPath)));
+    final String message = getSubsetSummaryMessage(input, _fs.file(outputPath));
+    if (quiet) {
+      _logger.printTrace(message);
+    } else {
+      _logger.printStatus(message);
+    }
     return true;
   }
 

packages/flutter_tools/lib/src/build_system/targets/ios.dart

@@ -519,6 +519,12 @@ class DebugIosLLDBInit extends Target {
   @override
   List<Target> get dependencies => <Target>[];
 
+  @override
+  Future<bool> canSkip(Environment environment) async {
+    // The `build swift-package` is not run on a device and therefore does not need an LLDB Init File.
+    return environment.defines[kBuildSwiftPackage] == 'true';
+  }
+
   @override
   Future<void> build(Environment environment) async {
     final String? sdkRoot = environment.defines[kSdkRoot];

packages/flutter_tools/lib/src/build_system/targets/macos.dart

@@ -313,6 +313,9 @@ class CompileMacOSFramework extends Target {
         extraGenSnapshotOptions.add('--trace-precompiler-to=${precompilerTraceFile.path}');
       }
 
+      // Suppress AOTSnapshotter build status logs
+      final quiet = environment.defines[kBuildSwiftPackage] == 'true';
+
       pending.add(
         snapshotter.build(
           buildMode: buildMode,
@@ -323,6 +326,7 @@ class CompileMacOSFramework extends Target {
           splitDebugInfo: splitDebugInfo,
           dartObfuscation: dartObfuscation,
           extraGenSnapshotOptions: extraGenSnapshotOptions,
+          quiet: quiet,
         ),
       );
     }

packages/flutter_tools/lib/src/commands/build_ios_framework.dart

@@ -163,11 +163,24 @@ abstract class BuildFrameworkCommand extends BuildSubCommand {
   /// Parses the NativeAssetsManifest.json in [outputDirectory] and returns a
   /// mapping from asset ID to the path of the code asset within the bundle
   /// (e.g., "MyFramework.framework/MyFramework").
-  static Map<String, String> parseNativeAssetsManifest(Directory outputDirectory) {
-    final File manifestFile = outputDirectory
-        .childDirectory('App.framework')
-        .childDirectory('flutter_assets')
-        .childFile('NativeAssetsManifest.json');
+  static Map<String, String> parseNativeAssetsManifest(
+    Directory outputDirectory,
+    FlutterDarwinPlatform platform,
+  ) {
+    File manifestFile;
+    switch (platform) {
+      case FlutterDarwinPlatform.ios:
+        manifestFile = outputDirectory
+            .childDirectory('App.framework')
+            .childDirectory('flutter_assets')
+            .childFile('NativeAssetsManifest.json');
+      case FlutterDarwinPlatform.macos:
+        manifestFile = outputDirectory
+            .childDirectory('App.framework')
+            .childDirectory('Resources')
+            .childDirectory('flutter_assets')
+            .childFile('NativeAssetsManifest.json');
+    }
     if (!manifestFile.existsSync()) {
       return const <String, String>{};
     }
@@ -205,9 +218,11 @@ abstract class BuildFrameworkCommand extends BuildSubCommand {
   ) {
     final Map<String, String> deviceAssets = BuildFrameworkCommand.parseNativeAssetsManifest(
       iPhoneBuildOutput,
+      FlutterDarwinPlatform.ios,
     );
     final Map<String, String> simulatorAssets = BuildFrameworkCommand.parseNativeAssetsManifest(
       simulatorBuildOutput,
+      FlutterDarwinPlatform.ios,
     );
 
     for (final String assetId in deviceAssets.keys) {