linux: unexport as many symbols as possible

main.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 666 matching lines @@
         'GLEW',
         'Cg',
         'CgGL',
     ],
     CPPDEFINES = [
         'RENDERER_GL',
         'LINUX',
         ['NACL_LINUX', '1'],
         'SK_BUILD_FOR_UNIX'
     ],
-    CCFLAGS = ['-Wstrict-aliasing', '-m32'],
+    CCFLAGS = ['-Wstrict-aliasing', '-fvisibility=hidden', '-m32'],
     LINKFLAGS = ['-m32'],
     LIBS = ['pthread', 'rt', 'dl'],
     NACL_HTP_LIBS = ['ssl', 'crypto'],
     BUILD_COMPONENTS = [
         'installer/linux'
     ],
 )
 
 linux_cg_dir = ARGUMENTS.get('linux-cg-dir', 'hermetic')
 if linux_cg_dir != 'hermetic':
@@ skipping 135 matching lines @@
     'o3d', environment_list,
     exclude_pattern = '.*third_party.*',
     extra_build_targets = {
         'Firefox': 'c:/Program Files/Mozilla FireFox/firefox.exe',
         'unit_tests': '$ARTIFACTS_DIR/unit_tests.exe',
         'system_tests': '$ARTIFACTS_DIR/system_tests.exe',
         'converter': '$ARTIFACTS_DIR/o3dConverter.exe',
     },
 )
 solution_env.Alias('solution', solution)