Re: [Boost-users] Please help: Getting started with Boost

From: Nishant Mittal (nishttal_at_[hidden])
Date: 2008-03-06 14:13:32

Thanks Volodya.
1) LD_LIBRARY_PATH solution worked but now when I run a.out, I get a
Segmentation fault.

My hello world code is...

                #include <iostream>
                #include <boost/thread/thread.hpp>
                #include <boost/thread/xtime.hpp>

                struct MyThreadFunc {
                   void operator( )( ) {
                      std::cout << "Hello World !!!" << std::endl;
                   }
                } threadFun;

                int main( ) {

                   boost::thread myThread(threadFun); // Create a thread
that starts
                                                      // running threadFun

                   boost::thread::yield( ); // Give up the main thread's
timeslice
                                           // so the child thread can get
some work
                                           // done.

                   // Go do some other work...

                   myThread.join( ); // The current (i.e., main) thread will
wait
                                    // for myThread to finish before it
returns

                }

Thanks in advance for your help

Nishant

-----Original Message-----
From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of Vladimir Prus
Sent: Thursday, March 06, 2008 2:00 PM
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] Please help: Getting started with Boost

Nishant Mittal wrote:

> I have a 64 bit red hat linux (also 64 bit) box.
> 
> 
> 1) I downloaded boost from
> 
> boost_1_34_1.tar.bz2
>
<http://downloads.sourceforge.net/boost/boost_1_34_1.tar.bz2?modtime=1185241
> 108&big_mirror=0>
> 
> 2) Unizipped and installed it (./configure , make install ) everything
> worked fine.
> 
>  
> 
> Questions:

[Well, neither question is actually a question about Boost, but anyway]
 
> 1)       How do I check if I now have the 64 bit version of boost?

        file <any-library-file>

should produce output such as:

        <library>: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV),
stripped

You can also use

        readelf -h <any-library-file>

> 
> 2)       I see that all libraries were put into /usr/local/lib and I can
> compile my hello world code with the following command.
> 
> *         $ g++ hello.cpp -lboost_thread-gcc41-mt-1_34_1
> 
> but when I try to run the created a.out file I get a file not found error
> msg.
> 
> *         $ ./a.out
> 
> *         ./a.out: error while loading shared libraries:
> libboost_thread-gcc41-mt-1_34_1.so.1.34.1: cannot open shared object file:
> No such file or directory
> 
> I did an ldd and this is the output.
> 
>             $ ldd a.out
> 
>         libboost_thread-gcc41-mt-1_34_1.so.1.34.1 => not found

You should add /usr/local/lib to LD_LIBRARY_PATH environment variable.

- Volodya

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