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From: evert.vandewaal_at_[hidden]
Date: 2008-08-15 04:53:44

Hi All,

I have had some problems compiling program_options v1.35 on visual C++ 9.0
(2008) Express. It seems that this compiler does not correctly export some
global variables when compiling to DLL, leading to unresolved dependencies.
I have had to make a few changes:

In file options_description.hpp, line 158:


        static const unsigned m_default_line_length;


        BOOST_STATIC_CONSTANT (unsigned, m_default_line_length = 80);

This is an old fix that I found in the mail archives (2005), seems to have
been erroneously dropped from the base-line.

In file options_description.cpp: removed the declaration of

In file value_semantic.cpp: a singleton variable was defined but not
properly linked by vc9.0. I changed the implementation to (line 17)




            static string* str=0;

            if (!str)


              str = new string;

              *str = "arg";


            return *str;


At line 79 (after making the change above), I changed the only use of arg


          untyped_value::name() const


              return arg();


In file details/value_semantic.hpp: I changed the declaration of the
variable arg to (line 13):

      BOOST_PROGRAM_OPTIONS_DECL std::string& arg();

After these changes, program_options links properly, and I was able to run
the demo code.

Please note that also the pre-compiled version of boost 1.35 for the vc9.0
compiler from suffers from
these problems: the program_options DLL is unlinkable due to unresolved
references to m_default_line_length and arg.


Evert van de Waal

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