fix for bin/devc relative path

lib/src/options.dart

 // Copyright (c) 2014, 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.
 
 /// Set of flags and options passed to the compiler
 library dev_compiler.src.options;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
@@ skipping 91 matching lines @@
   final int port;
 
   /// Host name or address for HTTP server when [serverMode] is on.
   final String host;
 
   /// Location for runtime files, such as `dart_runtime.js`. By default this is
   /// inferred to be under `lib/runtime/` in the location of the `dev_compiler`
   /// package (if we can infer where that is located).
   final String runtimeDir;
 
+  /// The files to compile.
   final List<String> inputs;
 
+  /// The base directory for [inputs]. Module imports will be generated relative
+  /// to this directory.
+  final String inputBaseDir;
+
   CompilerOptions({this.strongOptions: const StrongModeOptions(),
       this.sourceOptions: const SourceResolverOptions(),
       this.codegenOptions: const CodegenOptions(), this.checkSdk: false,
       this.dumpInfo: false, this.dumpInfoFile, this.useColors: true,
       this.help: false, this.logLevel: Level.SEVERE, this.serverMode: false,
       this.enableHashing: false, this.widget: true, this.host: 'localhost',
-      this.port: 8080, this.runtimeDir, this.inputs});
+      this.port: 8080, this.runtimeDir, this.inputs, this.inputBaseDir});
 }
 
 /// Parses options from the command-line
 CompilerOptions parseOptions(List<String> argv) {
   ArgResults args = argParser.parse(argv);
   bool showUsage = args['help'];
 
   var serverMode = args['server'];
   var enableHashing = args['hashing'];
   if (enableHashing == null) {
@@ skipping 170 matching lines @@
     // The pub-cache directory is two levels up, but we verify that the layout
     // looks correct.
     if (path.basename(dir) != 'dev_compiler') return null;
     dir = path.dirname(dir);
     if (path.basename(dir) != 'global_packages') return null;
     dir = path.dirname(dir);
     return path.join(dir, cacheDir, 'lib', 'runtime');
   }
   return null;
 }