[Bug gcov-profile/49484] gcov crash if two(or more) forks happen at the same time

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49484

--- Comment #6 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-17 
15:20:42 UTC ---
Making __gcov_var TLS also works, with similar restrictions.  Thus completely
privatizing the state and allocating/deallocating it via gcov_open/close seems
to be a proper re-working of libgcov.