Add gyp files to build NSS in Dart

runtime/bin/bin.gypi

 # 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.
 
 {
   'variables': {
     'crypto_cc_file': '<(SHARED_INTERMEDIATE_DIR)/crypto_gen.cc',
     'io_cc_file': '<(SHARED_INTERMEDIATE_DIR)/io_gen.cc',
     'io_patch_cc_file': '<(SHARED_INTERMEDIATE_DIR)/io_patch_gen.cc',
     'json_cc_file': '<(SHARED_INTERMEDIATE_DIR)/json_gen.cc',
@@ skipping 242 matching lines @@
       'target_name': 'libdart_builtin',
       'type': 'static_library',
       'dependencies': [
         'generate_builtin_cc_file',
         'generate_crypto_cc_file',
         'generate_io_cc_file',
         'generate_io_patch_cc_file',
         'generate_json_cc_file',
         'generate_uri_cc_file',
         'generate_utf_cc_file',
+        'nss',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'builtin_natives.cc',
         'builtin.h',
       ],
       'includes': [
         'builtin_impl_sources.gypi',
@@ skipping 23 matching lines @@
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-ldl',
             ],
           },
         }],
       ],
     },
     {
+      'target_name': 'nss',
+      'type': 'none',
+      'dependencies': [
+        'bin/net/nss.gyp:nss',
+        'bin/net/nss.gyp:nspr',
+        'bin/net/nss.gyp:nssckbi',
+        'bin/net/nss.gyp:nss_static',
+        'bin/net/ssl.gyp:libssl',
+        'bin/net/zlib.gyp:zlib',
+        'bin/net/sqlite.gyp:sqlite',
+      ],
+      'export_dependent_settings': [

[Ivan Posva, 2012/11/02 15:58:52]

Can you briefly explain what this does and why it was needed?

[Bill Hesse, 2012/11/02 16:08:15]

The targets like nss and zlib include direct-dependent settings for include
directories and defines, and to pass these up to the libdart_builtin, that is
actually compiling against the libraries and the header files, we need to pass
them through this intermediate target.  That is what export_dependent_settings
does.

We could avoid this by just putting the targets as dependencies in
libdart_builtin, and removing this target.  Do you think we should do this?

+        'bin/net/nss.gyp:nss',
+        'bin/net/nss.gyp:nspr',
+        'bin/net/nss.gyp:nssckbi',
+        'bin/net/nss.gyp:nss_static',
+        'bin/net/ssl.gyp:libssl',
+        'bin/net/zlib.gyp:zlib',
+        'bin/net/sqlite.gyp:sqlite',
+      ],
+    },
+    {
       'target_name': 'libdart_withcore',
       'type': 'static_library',
       'dependencies': [
         'libdart_lib_withcore',
         'libdart_vm',
         'libjscre',
         'libdouble_conversion',
         'generate_version_cc_file',
       ],
       'include_dirs': [
@@ skipping 241 matching lines @@
         ['OS=="mac"', {
           'xcode_settings': {
             'OTHER_LDFLAGS': [ '-undefined', 'dynamic_lookup' ],
           },
         }],
       ],
     },
   ],
 }