Re: [Boost-users] [config] policy for setting BOOST_HAS_THREADS?

Subject: Re: [Boost-users] [config] policy for setting BOOST_HAS_THREADS?
From: John Maddock (john_at_[hidden])
Date: 2008-11-11 04:49:39

JOAQUIN M. LOPEZ MUÑOZ wrote:
> Hello,
>
> What is the policy by which BOOST_HAS_THREADS gets defined
> or not? I used to think this macro is somehow affected by the
> selection of a single-threaded or multithreaded runtime library
> as done in bjam with threading=single and threading=multi, but
> some experiments in Linux suggest that this is not the case,
> as discussed in the following thread:

It's set if the compiler and it's std lib is in thread safe mode.  For gcc 
it's either set or not depending upon how gcc with built (since there are no 
compiler options that actually change the thread-safeness in recent gcc 
releases: and yes I checked with the gcc and libstdc++ teams on that!).  For 
other compilers (for example msvc) it may be set or not depending on what 
compiler options are used.

HTH, John.