SDK build bits for dartfmt.

utils/dartfmt/dartfmt.gyp

+# Copyright (c) 2013, 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'dartfmt',
+      'type': 'none',
+      'dependencies': [
+        '../../runtime/dart-runtime.gyp:dart',
+        '../../pkg/pkg.gyp:pkg_packages',
+      ],
+      'actions': [
+        {
+          'action_name': 'generate_dartfmt_snapshot',
+          'inputs': [
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
+            '../../sdk/lib/_internal/libraries.dart',
+            '<(SHARED_INTERMEDIATE_DIR)/packages.stamp',
+            '<!@(["python", "../../tools/list_files.py", "\\.dart$", "../../pkg/analyzer"])',
+          ],
+          'outputs': [
+            '<(SHARED_INTERMEDIATE_DIR)/dartfmt.dart.snapshot',
+          ],
+          'action': [
+            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
+            '--snapshot=<(SHARED_INTERMEDIATE_DIR)/dartfmt.dart.snapshot',
+            '../../pkg/analyzer/bin/formatter.dart',

[kustermann, 2013/12/09 08:48:44]

This command is building a snapshot of .../formatter.dart. A snapshot of a dart
application contains *all* dart code (which includes imported packages).

Therefore you need to add the correct package root here (so the VM can find the
imported packages when creating the snapshot). Something like this:
          'action': [
            '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)dart<(EXECUTABLE_SUFFIX)',
            '--snapshot=<(SHARED_INTERMEDIATE_DIR)/dartfmt.dart.snapshot',
            '--package-root=<(PRODUCT_DIR)/packages/',
            '../../pkg/analyzer/bin/formatter.dart',
          ],

+          ],
+        },
+      ],
+    },
+  ],
+}