[Boost-bugs] [Boost C++ Libraries] #7910: MSVC-11 can't find some symbols in Boost::System static library

Subject: [Boost-bugs] [Boost C++ Libraries] #7910: MSVC-11 can't find some symbols in Boost::System static library
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-01-20 21:30:09

#7910: MSVC-11 can't find some symbols in Boost::System static library
----------------------------------------------------------------------------+
 Reporter:  Gene Panov                                                      |       Owner:  bemandawes 
     Type:  Bugs                                                            |      Status:  new        
Milestone:  To Be Determined                                                |   Component:  system     
  Version:  Boost 1.52.0                                                    |    Severity:  Showstopper
 Keywords:  undefined symbol boost system generic_category system_category  |  
----------------------------------------------------------------------------+
 {{{
 #ifndef BOOST_SYSTEM_ERROR_CATEGORY_DIRTY_WORKAROUND
 #define BOOST_SYSTEM_ERROR_CATEGORY_DIRTY_WORKAROUND

 // I have not had a chance to investigate the root cause of this problem,
 // but it happens when I use boost::asio on MSVC-11 (Visual Studio 2012).
 // The problem seems to be that boost::system defines
 generic_error_category and system_error_category,
 // but then somehow doesn't have these symbols in the libboost_system-
 vc110-mt-1_52.lib library when you build boost
 // with just "/b2" with and toolset=msvc-11.0

 // For me the problem happened when I was trying to use boost::asio from
 something I compiled with MSVC-11.0.
 // I got linker errors, so it's a showstopper.
 // Feel free to contact me at MyName.MyLastName_at_[hidden] for more detail.

 // Now, I found that if you build boost on your machine with /b2 and then
 specifically do these two steps:
 // > b2 --with-system threading=multi link=static runtime-link=shared
 clean
 // > b2 --with-system threading=multi link=static runtime-link=shared
 // then magicaly the problem goes away and you don't need this workaround
 below it seems.

 // But since the root cause is not clear to me, the problem may not go
 away for you after the steps above.
 // So, if it didn't go away for you indeed, feel free to add this piece of
 source code into your application.
 // Two ways to do it:
 //  1. if you are adding this piece of code as an include file, uncomment
 these two lines:
 // #undef BOOST_SYSTEM_ERROR_CATEGORY_DIRTY_WORKAROUND
 // #define BOOST_SYSTEM_ERROR_CATEGORY_DIRTY_WORKAROUND inline
 //  2. but if you are adding it as a separate compilation unit (source
 file), then don't uncomment anything

 #if defined(_MSC_VER) && _MSC_VER >= 1700

 #include <system_error> // looks like implementations of three error
 categories are defined in MSVC 11 include files in 'std' namespace
 #include <boost/system/error_code.hpp> // interfaces for those error
 categories required by boost in 'boost' namespace, but somehow
 implementations cannot be found in the library files

 // glue that hooks up the implementations from MSVC11 to the interfaces
 required by boost
 // (this glue code is **unsafe** in case MSVC or Boost change interfaces
 for these error categories, because reinterpret_cast is used,
 // so a safer way to go about it would be to wrap std::error_category& as
 a field of some wrapper class that inherits from
 boost::system::error_category,
 // but it works with these versions, because boost and std interfaces are
 the same ("binary compatible"!) now and I don't yet have time to do it
 properly)
 namespace boost { namespace system {
         error_category const& system_category() {
                 return reinterpret_cast<const
 error_category&>(std::system_category());
         }
         error_category const& generic_category() {
                 return reinterpret_cast<const
 error_category&>(std::generic_category());
         }
         error_category const& iostream_category() {
                 return reinterpret_cast<const
 error_category&>(std::iostream_category());
         }
 }}

 #endif // defined(_MSC_VER) && _MSC_VER >= 1700

 #endif // BOOST_SYSTEM_ERROR_CATEGORY_DIRTY_WORKAROUND
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7910>
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