Re: [Boost-users] program_options - example will not compile

Subject: Re: [Boost-users] program_options - example will not compile
From: Jason Roehm (jasonr_at_[hidden])
Date: 2013-03-12 15:40:37

> I want to compile this file which can be found in boost 
> /libs/program_options/examples:
>
> A. g++ error. This is the command I am using with g++
> g++ first.cpp -o first -L/usr/local/lib/libboost_program_options.so
>
> and this is the error output:
>
> ------------
> /tmp/cctMoqyr.o: In function `main':
> first.cpp:(.text+0x1a): undefined reference to 
> `boost::program_options::options_description::m_default_line_length'
<snip>

The -L argument to g++ specifies a *directory* to search for libraries. 
The -l argument is used to specify which libraries you want to link. So, 
a fixed version of the command line would be something like:

     g++ first.cpp -o first -L/usr/local/lib -lboost_program_options

If /usr/local/lib is configured as one of the system library 
directories, you might not even need the -L.

Jason