Add flags to make App.framework work in app extension (#123618)

Add flags to make App.framework work in app extension

packages/flutter_tools/lib/src/base/build.dart

@@ -300,6 +300,7 @@ class AOTSnapshotter {
       '-dynamiclib',
       '-Xlinker', '-rpath', '-Xlinker', '@executable_path/Frameworks',
       '-Xlinker', '-rpath', '-Xlinker', '@loader_path/Frameworks',
+      '-fapplication-extension',
       '-install_name', '@rpath/App.framework/App',
       '-o', appLib,
       assemblyO,

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

@@ -677,6 +677,7 @@ Future<void> _createStubAppFramework(File outputFile, Environment environment,
         '-miphonesimulator-version-min=11.0',
       '-Xlinker', '-rpath', '-Xlinker', '@executable_path/Frameworks',
       '-Xlinker', '-rpath', '-Xlinker', '@loader_path/Frameworks',
+      '-fapplication-extension',
       '-install_name', '@rpath/App.framework/App',
       '-isysroot', sdkRoot,
       '-o', outputFile.path,

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

@@ -206,6 +206,7 @@ static const int Moo = 88;
       '-dynamiclib',
       '-Xlinker', '-rpath', '-Xlinker', '@executable_path/Frameworks',
       '-Xlinker', '-rpath', '-Xlinker', '@loader_path/Frameworks',
+      '-fapplication-extension',
       '-install_name', '@rpath/App.framework/App',
       '-o', outputFile.path,
     ]);

packages/flutter_tools/test/general.shard/base/build_test.dart

@@ -40,6 +40,7 @@ const List<String> kDefaultClang = <String>[
   '-rpath',
   '-Xlinker',
   '@loader_path/Frameworks',
+  '-fapplication-extension',
   '-install_name',
   '@rpath/App.framework/App',
   '-o',

packages/flutter_tools/test/general.shard/build_system/targets/common_test.dart

@@ -511,6 +511,7 @@ void main() {
         '-rpath',
         '-Xlinker',
         '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name',
         '@rpath/App.framework/App',
         '-o',

packages/flutter_tools/test/general.shard/build_system/targets/ios_test.dart

@@ -31,6 +31,7 @@ const List<String> _kSharedConfig = <String>[
   '-rpath',
   '-Xlinker',
   '@loader_path/Frameworks',
+  '-fapplication-extension',
   '-install_name',
   '@rpath/App.framework/App',
   '-isysroot',
@@ -95,6 +96,7 @@ void main() {
         '-rpath',
         '-Xlinker',
         '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name',
         '@rpath/App.framework/App',
         '-isysroot',

packages/flutter_tools/test/general.shard/build_system/targets/macos_test.dart

@@ -385,6 +385,7 @@ void main() {
         '-dynamiclib',
         '-Xlinker', '-rpath', '-Xlinker', '@executable_path/Frameworks',
         '-Xlinker', '-rpath', '-Xlinker', '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name', '@rpath/App.framework/App',
         '-o',
         environment.buildDir
@@ -417,6 +418,7 @@ void main() {
         '-dynamiclib',
         '-Xlinker', '-rpath', '-Xlinker', '@executable_path/Frameworks',
         '-Xlinker', '-rpath', '-Xlinker', '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name', '@rpath/App.framework/App',
         '-o',
         environment.buildDir
@@ -474,6 +476,7 @@ void main() {
         'xcrun', 'clang', '-arch', 'arm64', '-dynamiclib', '-Xlinker', '-rpath',
         '-Xlinker', '@executable_path/Frameworks', '-Xlinker', '-rpath',
         '-Xlinker', '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name', '@rpath/App.framework/App',
         '-o', environment.buildDir.childFile('arm64/App.framework/App').path,
         environment.buildDir.childFile('arm64/snapshot_assembly.o').path,
@@ -482,6 +485,7 @@ void main() {
         'xcrun', 'clang', '-arch', 'x86_64', '-dynamiclib', '-Xlinker', '-rpath',
         '-Xlinker', '@executable_path/Frameworks', '-Xlinker', '-rpath',
         '-Xlinker', '@loader_path/Frameworks',
+        '-fapplication-extension',
         '-install_name', '@rpath/App.framework/App',
         '-o', environment.buildDir.childFile('x86_64/App.framework/App').path,
         environment.buildDir.childFile('x86_64/snapshot_assembly.o').path,