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From: Peter Dimov (pdimov_at_[hidden])
Date: 2008-04-10 18:24:28

Another observation: the difference between g++/Sun in ST and MT mode:

is in the _PTHREADS macro (_REENTRANT is defined in both cases, which causes
BOOST_HAS_THREADS and BOOST_HAS_PTHREADS to be defined as well even in ST

Taking a Linux g++ at random:

_REENTRANT is correctly only defined in MT mode, but BOOST_HAS_THREADS (and
BOOST_HAS_PTHREADS) incorrectly remains defined in both.

g++ 4.1 also seems to work the same way, whereas g++ 4.0 and g++ 3.4 do not,
they always define _REENTRANT and there doesn't seem to be a way to detect
MT mode (at least judging by the output of config_info).

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