Peter Dimov wrote:
Joe Gottman quite correctly points out in
http://svn.boost.org/trac/boost/ticket/1762
that shared_ptr should honor user definitions of BOOST_DISABLE_THREADS and disable MT support.
Unfortunately, despite documenting quite clearly that BOOST_DISABLE_THREADS is a user macro, Boost.Config defines it in some situations. This means that I can't rely on this macro to reflect the user's intent, as I don't know whether it's been set explicitly by the user, or implicitly (and incorrectly IMO) by Boost.Config.
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The code in suffix.hpp looks like #if defined(BOOST_DISABLE_WIN32) && defined(_WIN32) \ && !defined(BOOST_DISABLE_THREADS) && !defined(BOOST_HAS_PTHREADS) # define BOOST_DISABLE_THREADS #endif As far as I can tell, the purpose of this is to disable threading if Windows is disabled and there is no other threading system available. I think we can get the same result in a much clearer fashion without touching BOOST_DISABLE_THREADS by the following: #if defined(BOOST_DISABLE_WIN32) && defined(_WIN32) # undef BOOST_HAS_WINTHREADS #endif Joe Gottman