[PING] Fix PR199785, symbol visibility in libgcov

[Nathan Sidwell]

Janis Johnson wrote:
> Patch ping: hide global symbols in libgcov.a so that an instrumented
> shared library doesn't use the same function instances as an executable
> that exports globals to the dynamic symbol table.  Fixes PR 19985, a
> regression from GCC 3.3 reported by multiple real users.
> 
>   http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01484.html

ok. Thanks for the explaination.

nathan

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