Fix the -fvisibility=hidden settings to work with the linux shlib build....

ppapi.gyp

 # Copyright (c) 2010 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': {
     'chromium_code': 1,  # Use higher warning level.
+  },
+  'target_defaults': {
     'conditions': [
       # Linux shared libraries should always be built -fPIC.
       #
       # TODO(ajwong): For internal pepper plugins, which are statically linked
       # into chrome, do we want to build w/o -fPIC?  If so, how can we express
       # that in the build system?
       ['OS=="linux" or OS=="openbsd" or OS=="freebsd" or OS=="solaris"', {
-        'use_fpic': 1,
-      },{
-        'use_fpic': 0,
+        'cflags': ['-fPIC', '-fvisibility=hidden'],
+
+        # This is needed to make the Linux shlib build happy. Without this,
+        # -fvisibility=hidden gets stripped by the exclusion in common.gypi
+        # that is triggered when a shared library build is specified.
+        'cflags/': [['include', '^-fvisibility=hidden$']],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'ppapi_c',
       'type': 'none',
       'all_dependent_settings': {
         'include_dirs': [
            '..',
@@ skipping 103 matching lines @@
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_guid': 'AD371A1D-3459-4E2D-8E8A-881F4B83B908',
           'msvs_settings': {
             'VCCLCompilerTool': {
               'AdditionalOptions': ['/we4244'],  # implicit conversion, possible loss of data
             },
           },
         }],
-        ['use_fpic==1', {
-          'cflags': ['-fPIC'],
-        }],
         ['OS=="linux"', {
           'cflags': ['-Wextra', '-pedantic'],
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'], 
            },
         }]
       ],
     },
     {
       'target_name': 'ppapi_cpp',
       'type': 'static_library',
       'dependencies': [
         'ppapi_c',
         'ppapi_cpp_objects',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'cpp/module_embedder.h',
         'cpp/ppp_entrypoints.cc',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_guid': '057E7FA0-83C0-11DF-8395-0800200C9A66',
         }],
-        ['use_fpic==1', {
-          'cflags': ['-fPIC'],
-        }],
         ['OS=="linux"', {
           'cflags': ['-Wextra', '-pedantic'],
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
@@ skipping 34 matching lines @@
         }],
         ['OS=="mac"', {
           'type': 'loadable_module',
           'mac_bundle': 1,
           'product_name': 'PPAPIExample',
           'product_extension': 'plugin',
           'sources+': [
             'example/Info.plist'
           ],
         }],
-        ['use_fpic', {
-          'cflags': ['-fPIC'],
-        }],
       ],
       # See README for instructions on how to run and debug on the Mac.
       #'conditions' : [
       #  ['OS=="mac"', {
       #    'target_name' : 'Chromium',
       #    'type' : 'executable',
       #    'xcode_settings' : {
       #      'ARGUMENTS' : '--renderer-startup-dialog --internal-pepper --no-sandbox file://${SRCROOT}/test_page.html'
       #    },
       #  }],
@@ skipping 33 matching lines @@
             '_CRT_NONSTDC_NO_WARNINGS',
             '_CRT_NONSTDC_NO_DEPRECATE',
             '_SCL_SECURE_NO_DEPRECATE',
           ],
         }],
         ['OS=="mac"', {
           'mac_bundle': 1,
           'product_name': 'ppapi_tests',
           'product_extension': 'plugin',
         }],
-        ['use_fpic', {
-          'cflags': ['-fPIC'],
-        }],
       ],
     },
   ],
 }