[Bug libstdc++/40518] data races when calling std::string::erase() on empty string

[jwakely dot gcc at gmail dot com]

------- Comment #8 from jwakely dot gcc at gmail dot com  2009-06-22 20:30 
-------
the revised patch tests ok, no helgrind errors from

std::string s;
s.erase();
s.erase(s.begin(), s.end());


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40518