[boost] [config] BOOST_HAS_THREADS with libstdc++

Subject: [boost] [config] BOOST_HAS_THREADS with libstdc++
From: Frank Mori Hess (frank.hess_at_[hidden])
Date: 2008-09-29 14:04:18

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It looks like the gcc bug (pr 11953) that inspired the workaround in 
boost/config/stdlib/libstdcpp3.hpp that goes:

#ifdef __GLIBCXX__ // gcc 3.4 and greater:
#  if defined(_GLIBCXX_HAVE_GTHR_DEFAULT) \
        || defined(_GLIBCXX__PTHREADS)
      //
      // If the std lib has thread support turned on, then turn it on in Boost
      // as well.  We do this because some gcc-3.4 std lib headers define 
_REENTANT
      // while others do not...
      //
#     define BOOST_HAS_THREADS

was fixed for mainstream gcc 4.1.2 and later versions in December of 2006.  So 
can we change the first line to something like:

#ifdef __GLIBCXX__  && __GLIBCXX__<20070101

so detection of whether gcc is in multi-threaded mode or not works again?
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