Re: [Boost-users] a newbie question

From: Rene Rivera (grafik.list_at_[hidden])
Date: 2005-11-03 17:56:42

Tuan A. Tran wrote:

> I am a newbie. I would like to run a simple threaded program using boost. I
> got a sample file see below and compile with the following command
> g++ simple.cpp -lthread
> 
> I got error
> ////
> In file included from /usr/include/boost/thread/detail/config.hpp:18,
> from /usr/include/boost/thread/thread.hpp:15,
> from /usr/include/boost/thread.hpp:15,
> from simple.cpp:9:
> /usr/include/boost/config/requires_threads.hpp:47:5: #error "Compiler
> threading support is not turned on. Please set the correct command line
> options for threading: -pthread (Linux), -pthreads (Solaris) or -mthreads
> (Mingw32)"
[...]
> If I use commend g++ simple.cpp -pthread
> I got error
> ////////
> /tmp/cchxK5CW.o(.text+0x66): In function `main':
> : undefined reference to
> `boost::thread::thread[in-charge](boost::function0<void,
> std::allocator<boost::function_base> > const&)'
> /tmp/cchxK5CW.o(.text+0x9d): In function `main':
> : undefined reference to `boost::thread::join()'
> /tmp/cchxK5CW.o(.text+0xa8): In function `main':
> : undefined reference to `boost::thread::~thread [in-charge]()'
> /tmp/cchxK5CW.o(.text+0xc2): In function `main':
> : undefined reference to `boost::thread::~thread [in-charge]()'
> collect2: ld returned 1 exit status
> ///////////
> 
> I do not know what went wrong. Can anyone tell me what I did wrong? How
> should I correct so that I can compile this example?

You also need to link to the compiled Boost.Thread library. Adding 
"-lboost_thread" might work.

-- 
-- Grafik - Don't Assume Anything
-- Redshift Software, Inc. - http://redshift-software.com
-- rrivera/acm.org - grafik/redshift-software.com
-- 102708583/icq - grafikrobot/aim - Grafik/jabber.org