linux: unexport as many symbols as possible

v8/build.scons

 # Copyright 2009, Google Inc.
 # 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
@@ skipping 32 matching lines @@
 
 if env.Bit('windows'):
   script_suffix = '.bat'
 else:
   script_suffix = '.sh'
 
 env = env.Clone(
     V8_MODE = 'release',
     V8_MODE_DIR = '$V8_SRC_DIR/obj/$V8_MODE',
     V8_SCONS_COM = '$PYTHON $SCONS -C $V8_SRC_DIR -f SConstruct '
-                   '$DEBUG_OPTS mode=$V8_MODE importenv=INCLUDE,LIB',
+                   '$DEBUG_OPTS mode=$V8_MODE importenv=INCLUDE,LIB,CCFLAGS',
     SCONS = '$SCONS_DIR/scons.py',
     DEBUG_OPTS = ['--debug=%s' % item for item in GetOption('debug')]
 )
 
 # Rather than build v8 with our own commands, we just shell out to v8's
 # own SCons-based build, since their build system is complicated.
 # This SConscript just declares dependencies on the outputs of that build.
 
 mksnapshot_exe = env.File('$V8_MODE_DIR/mksnapshot${PROGSUFFIX}')
 libraries_obj = env.File('$V8_MODE_DIR/libraries${OBJSUFFIX}')
@@ skipping 38 matching lines @@
     v8_env['ENV']['INCLUDE'] = include_path
 
   lib_path = ";".join(
     [v8_env.subst("$PLATFORM_SDK_VISTA_6_0_DIR/Lib"),
      v8_env.subst("$LIB")])
 
   try:
     v8_env['ENV']['LIB'] =  lib_path  + ";" + v8_env['ENV']['LIB']
   except KeyError:
     v8_env['ENV']['LIB'] = lib_path
+elif v8_env.Bit('linux'):
+  v8_env['ENV']['CCFLAGS'] = '-fvisibility=hidden'
 
 v8_no_snapshot = v8_env.Command(
     v8_scons_targets_no_snapshot,
     [],
     ['$V8_SCONS_COM msvcltcg=off snapshot=off sample=shell'])
 
 v8_snapshot = v8_env.Command(
     v8_scons_targets_snapshot,
     [],
     ['$V8_SCONS_COM msvcltcg=off snapshot=on'])
 
 v8_env.AlwaysBuild(v8_no_snapshot)
 v8_env.AlwaysBuild(v8_snapshot)
 
 # Tell our SCons invocation to *not* delete v8.lib and the other targets
 # before building them, so the subsidiary v8 SCons call doesn't always
 # rebuild them (thereby causing us to always rebuild their dependents).
 v8_env.Precious(v8_no_snapshot)
 v8_env.Precious(v8_snapshot)
 
 v8_env.Install('$LIB_DIR', v8_lib)