Work around a Gyp bug by creating a stamp file for the http package.

pkg/pkg.gyp

 # Copyright (c) 2012, 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': 'pkg_packages',
       'type': 'none',
       'actions': [
@@ skipping 18 matching lines @@
           'action': [
             'python', '../tools/make_links.py',
             '--timestamp_file=<(SHARED_INTERMEDIATE_DIR)/packages.stamp',
             '<(PRODUCT_DIR)/packages',
             '<@(_inputs)',
           ],
         },
       ],
     },
     {
       'target_name': 'pub_packages',

[ahe, 2014/08/06 14:15:51]

Adding another target here isn't necessary.

[nweiz, 2014/08/06 21:18:05]

Why not? We need to refer to this target as distinct from pkg_packages, don't
we?

       'type': 'none',
       'actions': [
         {
           'action_name': 'remove_html_imports',
           'inputs': [
             '../tools/remove_html_imports.py',
-            '<!@(["python", "../tools/list_files.py", "\\.dart$", "http/lib"])',
+            '<(SHARED_INTERMEDIATE_DIR)/http_files.stamp',

[ahe, 2014/08/06 14:15:51]

This target is always run because this file doesn't exist.

To depend on a generated file you need to do two things.

Assume you in target "T1" have action "A1" which generates file "foo.txt", and
you in target "T2" have action "A2" which depends on "foo.txt:

1. List the file as an input of action "A2" (which you have done).

2. List the target "T1" as a dependency of target "T2" (that is missing).

[ahe, 2014/08/06 14:25:55]

That's not correct. It is the action "make_pub_packages" that is always being
run.

Regardless, the problem is with this line. If I manually create
xcodebuild/DerivedSources/ReleaseIA32/http_files.stamp, the action
"make_pub_packages" isn't run when it isn't necessary.

[nweiz, 2014/08/06 21:18:05]

Done.

           ],
           'outputs': [
             '<(SHARED_INTERMEDIATE_DIR)/remove_html_imports/http/lib/http.dart',
           ],
           'action': [
             'python', '../tools/remove_html_imports.py',
             'http/lib',
             '<(SHARED_INTERMEDIATE_DIR)/remove_html_imports/http/lib',
           ],
         },
@@ skipping 22 matching lines @@
             '--timestamp_file=<(SHARED_INTERMEDIATE_DIR)/pub_packages.stamp',
             '<(PRODUCT_DIR)/pub_packages',
             '<@(_inputs)',
             '<(SHARED_INTERMEDIATE_DIR)/remove_html_imports/http/lib',
           ],
         },
       ],
     }
   ],
 }