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Date: Sun, 30 Jun 2013 19:43:48 +0200
From: marco atzeri <marco DOT atzeri AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: difficulty with c++ boost::thread (1.53.0) on Cygwin 1.7.20(0.266/5/3)
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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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