/usr/src/gcc-4.7/debian/libobjc4.symbols is in gcc-4.7-source 4.7.4-3ubuntu12.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | libobjc.so.4 libobjc4 #MINVER#
#include "libobjc4.symbols.common"
__gnu_objc_personality_v0@Base 4.2.1
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