[Chromecast] Include all stdlibc++/libgcc symbols in cast_shell.

chromecast/chromecast.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'android_support_v13_target%':
         '../third_party/android_tools/android_tools.gyp:android_support_v13_javalib',
     'cast_build_release': 'internal/build/cast_build_release',
     'cast_is_debug_build%': 0,
@@ skipping 58 matching lines @@
         'public/osd_surface.h',
         'public/task_runner.h',
         'public/video_plane.h',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'public/',
         ],
       },
     },
+    # Applies linker flags to include whole libstdc++/libgcc and export them.
+    {
+      'target_name': 'cast_shlib_consumer_ldflags',

[bcf, 2015/11/25 19:31:23]

This is a target any executable which uses libcast* shlibs should depend on.

I assume we'd accomplish the same thing in gn using a config, but how can we add
ldflags to the end of link line (this is important)?

gn provides `libs`, but it prepends to each option: "Expands to the list of
system libraries to link to. Each will be prefixed by the "lib_prefix".". For
example "foo" will become "-lfoo"

https://chromium.googlesource.com/chromium/src/+/master/tools/gn/docs/referen...

+      'type': '<(component)',
+      'link_settings': {
+        'ldflags': ['-Wl,--export-dynamic'],
+        'libraries': [
+          '-Wl,--allow-multiple-definition',
+          '-Wl,--whole-archive',
+          '-l:libstdc++.a',
+          '-l:libgcc.a',
+          '-Wl,--no-whole-archive',
+        ],
+      },
+    },
     {
       'target_name': 'cast_base',
       'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'sources': [
         'base/android/dumpstate_writer.cc',
         'base/android/dumpstate_writer.h',
         'base/android/system_time_change_notifier_android.cc',
@@ skipping 679 matching lines @@
                 '../ui/ozone/ozone.gyp:eglplatform_shim_x11',
               ],
             }],
           ],
         },
         {
           'target_name': 'cast_shell',
           'type': 'executable',
           'dependencies': [
             'cast_shell_core',
+            'cast_shlib_consumer_ldflags',

[wzhong, 2015/11/25 20:46:26]

This only covers cast_shell.

How about other exec such as update_engine and unittests?

Why not just change chromium/src/build/common.gypi, where we already have
-static-libstdc++ and -static-libgcc?

           ],
           'sources': [
             'app/cast_main.cc',
           ],
         },
       ],  # end of targets
     }],
   ],  # end of conditions
 }