Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3690: regex depends on pthread library when boost is built with threading=single
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-12-03 16:39:05
#3690: regex depends on pthread library when boost is built with threading=single
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Reporter: jdccdevel@⦠| Owner: vladimir_prus
Type: Bugs | Status: new
Milestone: Boost 1.42.0 | Component: build
Version: Boost 1.40.0 | Severity: Problem
Keywords: |
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Changes (by johnmaddock):
* owner: johnmaddock => vladimir_prus
* component: regex => build
Comment:
I'm reassigning this because it's a Boost.Build issue, but... it might not
be an issue at all:
As I recall after a long and agonising discussion, Boost.Build and
Boost.Config were changed so that:
* threading=multi: changes whatever needs changing to make multithreaded
builds work.
* threading=single: actually just uses the compiler's default options, if
those happen to be thread-safe (ie the same as used for threading=multi)
then BOOST_HAS_THREADS gets defined, and regex will use pthreads.
The rationale for this change was that most people actually want "one true
binary" rather than a multitude of threadsafe / not threadsafe options.
So on many platforms threading=multi and threading=single actually deliver
the same thing. [aside - it would actually have been better IMO to have
had 3 options - threading=multi, threading=default, and threading=single]
There is one other option, which is to build with BOOST_DISABLE_THREADS
defined, which really will build a thread-unsafe binary - and of course
that define would have to be set when you compile your source code as
well.
I notice you don't mention which compiler you are using? Can you confirm
whether there is any material differnce between how your compiler behaves
with and without whatever command-line options are enabled by
threading=multi (try building with bjam -d2 to see what options are being
used)?
HTH, John.
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/3690#comment:1> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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