[Bug libstdc++/12540] New: Memory leak in locale::locale(const char*)

["peturr02 at ru dot is" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12540

           Summary: Memory leak in locale::locale(const char*)
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libstdc++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: peturr02 at ru dot is
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu

There is a memory leak in the constructor locale::locale(const char*).
The string allocated with strdup in the following snippet is leaked
under some conditions.

                // LANG may set a default different from "C".
                char* __env = std::getenv("LANG");
                if (!__env || std::strcmp(__env, "") == 0 
                    || std::strcmp(__env, "C") == 0 
                    || std::strcmp(__env, "POSIX") == 0)
                  __res = strdup("C");
                else 
                  __res = strdup(__env);

[...]

                      }
                    __str.erase(__str.end() - 1);
                    _M_impl = new _Impl(__str.c_str(), 1);
                  }
                // ... otherwise either an additional instance of
                // the "C" locale or LANG.
                else if (std::strcmp(__res, "C") == 0)
                  (_M_impl = _S_classic)->_M_add_reference();
                else
                  _M_impl = new _Impl(__res, 1);
                std::free(__res);

The leak occurs if the calls to locale::_Impl::_Impl throws an exception,
in that case free isn't called.