Make 'hidden' the default visibility for gcc. Add build option,

SConstruct

 # Copyright 2008 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 97 matching lines @@
     },
     'debuggersupport:on': {
       'CPPDEFINES':   ['ENABLE_DEBUGGER_SUPPORT'],
     }
   },
   'gcc': {
     'all': {
       'CCFLAGS':      ['$DIALECTFLAGS', '$WARNINGFLAGS'],
       'CXXFLAGS':     ['$CCFLAGS', '-fno-rtti', '-fno-exceptions'],
     },
+    'visibility:hidden': {
+      # Use visibility=default to disable this

[Erik Corry, 2009/09/15 11:09:25]

.

+      'CXXFLAGS':     ['-fvisibility=hidden']
+    },
     'mode:debug': {
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG'],
       'os:android': {
         'CCFLAGS':    ['-mthumb']
       }
     },
     'mode:release': {
       'CCFLAGS':      ['-O3', '-fomit-frame-pointer', '-fdata-sections',
                        '-ffunction-sections'],
@@ skipping 98 matching lines @@
         'ARFLAGS':      ['/LTCG'],
       }
     }
   }
 }
 
 
 V8_EXTRA_FLAGS = {
   'gcc': {
     'all': {
-      'CXXFLAGS':     [], #['-fvisibility=hidden'],
       'WARNINGFLAGS': ['-Wall',
                        '-Werror',
                        '-W',
                        '-Wno-unused-parameter',
                        '-Wnon-virtual-dtor']
     },
     'os:win32': {
       'WARNINGFLAGS': ['-pedantic', '-Wno-long-long']
     },
     'os:linux': {
@@ skipping 375 matching lines @@
   },
   'console': {
     'values': ['dumb', 'readline'],
     'default': 'dumb',
     'help': 'the console to use for the d8 shell'
   },
   'verbose': {
     'values': ['on', 'off'],
     'default': 'off',
     'help': 'more output from compiler and linker'
+  },
+  'visibility': {
+    'values': ['default', 'hidden'],
+    'default': 'hidden',
+    'help': 'shared library symbol visibility'
   }
 }
 
 
 def GetOptions():
   result = Options()
   result.Add('mode', 'compilation mode (debug, release)', 'release')
   result.Add('sample', 'build sample (shell, process)', '')
   result.Add('env', 'override environment settings (NAME0:value0,NAME1:value1,...)', '')
   result.Add('importenv', 'import environment settings (NAME0,NAME1,...)', '')
@@ skipping 331 matching lines @@
 # version of scons.  Also, there's a bug in some revisions that
 # doesn't allow this flag to be set, so we swallow any exceptions.
 # Lovely.
 try:
   SetOption('warn', 'no-deprecated')
 except:
   pass
 
 
 Build()