Re: [Boost-users] msvc fail to link with dynamic boost_program_options library

Subject: Re: [Boost-users] msvc fail to link with dynamic boost_program_options library
From: Vladimir Prus (vladimir_at_[hidden])
Date: 2009-10-14 09:44:01

André Prins wrote:

> Hi all,
> 
> I am having exactly the same problems when trying to link my main-app
> to a DLL-version of Boost::program_options. (using MSVC 9 and Boost
> 1.40).
> 
>> main.obj : error LNK2001: unresolved external symbol "public: static
>> unsigned int const
>> boost::program_options::options_description::m_default_line_length"
>> (?m_default_line_length_at_options_description_at_program_options_at_boost@@2IB)
> 
> For the first unresolved external, to the
> options_description::m_default_line_length, there is a workaround, by
> explicitly specifying a line-length as the second argument when
> constructing your descriptions. E.g.
> 
>     po::options_description descriptions( "All options", 80 ); // Note
> the extra argument 80
> 
>> main.obj : error LNK2001: unresolved external symbol "class
>> std::basic_string<char,struct std::char_traits<char>,class
>> std::allocator<char> > boost::program_options::arg"
>> (?arg_at_program_options_at_boost@@3V?$basic_string_at_DU?$char_traits_at_D@std@@V?$allocator_at_D@2@@std@@A)
> 
> For the second unresolved external, I could not find a solution and I
> decided to build a static version of Boost::program_options. This
> solved both of these two problems.

It would be nice if somebody figure what this problem is and explain this to me. Or
provide a patch ;-)

- Volodya