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List:       cygwin
Subject:    Re: difficulty with c++ boost::thread (1.53.0) on Cygwin 1.7.20(0.266/5/3)
From:       Lewis S <lewis.cygwin () gmail ! com>
Date:       2013-06-30 23:06:19
Message-ID: CAOgZ4k9NQkhg6c7BZLB3oJwK6=mAgJqB+H4SoTVVidAU7khjZQ () mail ! gmail ! com
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Thanks for the information about nm
We're both using the same g++ -- and presumably the same boost & cygwin.
I'm still at the same error.
... unless there are other suggestions, I guess I'll re-install cygwin
and hope for the best.

With gratitude,
Lewis


On Sun, Jun 30, 2013 at 10:43 AM, marco atzeri <marco.atzeri@gmail.com> wrote:
> Il 6/30/2013 6:31 PM, Lewis S ha scritto:
> 
> > Thanks Marco!
> > 
> > I now get complaints about start_thread_noexcept:
> > 
> > $ g++ -D THREADED  multithread.cpp -l boost_system-mt -l boost_thread-mt
> 
> 
> it works on my system, with
> 
> $ g++ --version
> g++ (GCC) 4.5.3
> 
> 
> 
> > 
> > /tmp/ccfP6V1v.o:multithread.cpp:(.text$_ZN5boost6thread12start_threadEv[boost::thread::start_thread()]+0xe):
> >  undefined reference to `boost::thread::start_thread_noexcept()'
> > collect2: ld returned 1 exit status
> > 
> > Can you (or anyone) tell me how to go from the "undefined reference"
> > error to the name of the library to be loaded?
> 
> 
> $ nm  /usr/lib/libboost_thread-mt.dll.a |grep start_thread
> 00000000 I __imp___ZN5boost6thread12start_threadEv
> 00000000 T __ZN5boost6thread12start_threadEv
> 00000000 I __imp___ZN5boost6thread12start_threadERKNS_17thread_attributesE
> 00000000 T __ZN5boost6thread12start_threadERKNS_17thread_attributesE
> 
> 
> > Do the -l argument themselves require an order?  If so, how do I learn
> > the required ordering (w/o trial&error)
> 
> 
> -l requires an order if one library depends on a following one.
> For your case both ways work
> 
> g++  -D THREADED  multithread.cpp  -l boost_thread-mt -l boost_system-mt
> 
> as there is no dependency between them
> 
> > 
> > With gratitude,
> > Lewis
> > 
> > 
> 
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