Unifying compiler context

pkg/compiler/tool/generate_kernel.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Helper to run fasta with the right target configuration to build dart2js
 /// applications using the dart2js platform libraries.
 // TODO(sigmund): delete this file once we can configure fasta directly on the
 // command line.
 library compiler.tool.generate_kernel;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:compiler/src/kernel/dart2js_target.dart';
 import 'package:front_end/front_end.dart';
 import 'package:front_end/src/fasta/util/relativize.dart';
 import 'package:kernel/kernel.dart';
 import 'package:kernel/target/targets.dart';
 
 main(List<String> args) async {
   ArgResults flags = _argParser.parse(args);
   var options = new CompilerOptions()
     ..target = new Dart2jsTarget(new TargetFlags())
     ..packagesFileUri = Uri.base.resolve('.packages')
     ..compileSdk = true
-    ..linkedDependencies = [Uri.base.resolve(flags['platform'])]
-    ..onError = errorHandler;
+    ..setExitCodeOnProblem = true
+    ..linkedDependencies = [Uri.base.resolve(flags['platform'])];
 
   if (flags.rest.isEmpty) {
     var script = relativizeUri(Platform.script);
     var platform = relativizeUri(Uri.base.resolve(flags['platform']));
     print('usage: ${Platform.executable} $script '
         '[--platform=$platform] [--out=out.dill] program.dart');
     exit(1);
   }
 
   Uri entry = Uri.base.resolve(flags.rest.first);
   var program = await kernelForProgram(entry, options);
   await writeProgramToBinary(program, flags['out']);
 }
 
-void errorHandler(CompilationError e) {
-  exitCode = 1;
-  print(e.message);
-}
-
 ArgParser _argParser = new ArgParser()
   ..addOption('platform',
       help: 'location of the precompiled dart2js sdk',
       defaultsTo: _defaultPlatform)
   ..addOption('out',
       abbr: 'o', help: 'output location', defaultsTo: 'out.dill');
 
 String _defaultPlatform = Uri
     .parse(Platform.resolvedExecutable)
     .resolve('patched_dart2js_sdk/platform.dill')
     .toString();