Linux: link with --as-needed to eliminate direct dependencies on 15 shared li...

plugin/plugin.gyp

 # Copyright (c) 2009 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.
 
 # PLEASE NOTE: This file contains the targets for generating the
 # plugin two different ways -- once as a shared library, and once as a
 # static library.  The static library is only built if we are inside
 # of a Chrome tree, and it gets built with different defined symbols,
 # and without the packaging code on the Mac.  The shared library gets
 # built in an o3d tree, or in a chrome tree when built by an o3d
@@ skipping 214 matching lines @@
         ['OS == "linux"',
           {
             'sources': [
               'linux/config.cc',
               'linux/envvars.cc',
               'linux/main_linux.cc',
             ],
             'ldflags': [
               '-Wl,-znodelete',
               '-Wl,--gc-sections',
+              '<!@(pkg-config --libs-only-L xt)',
+              # The Cg libs use three other libraries without linking to them,
+              # which breaks --as-needed, so we have to specify them here before
+              # the --as-needed flag.
+              '-lGL',       # Used by libCgGL
+              '-lpthread',  # Used by libCg
+              '-lm',        # Used by libCg
+              # GYP dumps all static and shared libraries into one archive group
+              # on the command line in arbitrary order, which breaks
+              # --as-needed, so we have to specify the out-of-order ones before
+              # the --as-needed flag.
+              '-lCgGL',
+              '-lGLEW',
+              '-lrt',
+              # Directs the linker to only generate dependencies on libraries
+              # that we actually use. Must come last.
+              '-Wl,--as-needed',
+            ],
+            'libraries': [
+              '<!@(pkg-config --libs-only-l xt)',
             ],
             'conditions' : [
               ['plugin_rpath != ""',
                 {
                   'ldflags': [
                     '-Wl,-rpath', '-Wl,<(plugin_rpath)',
                   ],
                 },
               ],
               ['plugin_env_vars_file != ""',
                 {
                   'defines': [
                     'O3D_PLUGIN_ENV_VARS_FILE="<(plugin_env_vars_file)"',
                   ],
                 },
               ],
             ],
           },
         ],
-        ['OS == "linux"',
-          {
-            'sources': [
-            ],
-          },
-        ],
         ['OS == "win"',
           {
             'dependencies': [
               '../breakpad/breakpad.gyp:o3dBreakpad',
             ],
             'sources': [
               'win/config.cc',
               'win/logger_main.cc',
               'win/main_win.cc',
               'win/o3dPlugin.def',
@@ skipping 435 matching lines @@
       },
     ],
   ],
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
 # End:
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