/usr/src/gcc-5/debian/libmpx.symbols is in gcc-5-source 5.3.1-14ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | libmpx.so.0 #PACKAGE# #MINVER#
(symver)LIBMPX_1.0 5
libmpxwrappers.so.0 #PACKAGE# #MINVER#
(symver)LIBMPXWRAPPERS_1.0 5
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