[Boost-users] Problem linking to Boost Filesystem Library

Subject: [Boost-users] Problem linking to Boost Filesystem Library
From: DDBeatty_at_[hidden]
Date: 2008-10-06 16:15:00

I am getting an unresolved external error when auto-linking to the Boost
Filesystem Library

Compiler: Visual Studio 2005
Boost Library Version: 1.36.0

The error:

packagereport.obj : error LNK2001: unresolved external symbol "class
boost::system::error_code boost::filesystem::detail::throws"
(?throws_at_detail@filesystem_at_boost@@3Verror_code_at_system@3_at_A)

The Boost Libraries were compiled using Visual Studio 2005 as well.

I compiled with BOOST_LIB_DIAGNOSTIC and got the following two lines in the
output:

Linking to lib file: libboost_system-vc80-mt-gd-1_36.lib
Linking to lib file: libboost_filesystem-vc80-mt-gd-1_36.lib

I added /verbose to the linker and got the following:

Processed /DEFAULTLIB:libboost_system-vc80-mt-gd-1_36.lib
Processed /DEFAULTLIB:libboost_filesystem-vc80-mt-gd-1_36.lib

    Searching ..\3rdParty\Boost\lib\libboost_system-vc80-mt-gd-1_36.lib:
      Found "class boost::system::error_category const & __cdecl
boost::system::get_system_category(void)"
(?get_system_category_at_system@boost@@YAABVerror_category_at_12@XZ)
        Referenced in packagereport.obj
        Loaded
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
      Found "class boost::system::error_category const & __cdecl
boost::system::get_generic_category(void)"
(?get_generic_category_at_system@boost@@YAABVerror_category_at_12@XZ)
        Referenced in packagereport.obj
        Loaded
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
      Found __IMPORT_DESCRIPTOR_boost_system-vc80-mt-gd-1_36
        Referenced in
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
        Referenced in
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
        Loaded
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
      Found boost_system-vc80-mt-gd-1_36_NULL_THUNK_DATA
        Referenced in
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
        Loaded
libboost_system-vc80-mt-gd-1_36.lib(boost_system-vc80-mt-gd-1_36.dll)
    Searching
..\3rdParty\Boost\lib\libboost_filesystem-vc80-mt-gd-1_36.lib:
      Found "class boost::filesystem::file_status __cdecl
boost::filesystem::detail::status_api(class std::basic_string<char,struct
std::char_traits<char>,class std::allocator<char> > const &,class
boost::system::error_code &)"
(?status_api_at_detail@filesystem_at_boost@@YA?AVfile_status_at_23@ABV?$basic_string_at_DU?$char_traits_at_D@std@@V?$allocator_at_D@2@@std@@AAVerror_code_at_system@3@@Z)
        Referenced in packagereport.obj
        Loaded
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
      Found "class boost::system::error_code __cdecl
boost::filesystem::detail::remove_api(class std::basic_string<char,struct
std::char_traits<char>,class std::allocator<char> > const &)"
(?remove_api_at_detail@filesystem_at_boost@@YA?AVerror_code_at_system@3_at_ABV?$basic_string_at_DU?$char_traits_at_D@std@@V?$allocator_at_D@2@@std@@@Z)
        Referenced in packagereport.obj
        Loaded
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
      Found __IMPORT_DESCRIPTOR_boost_filesystem-vc80-mt-gd-1_36
        Referenced in
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
        Referenced in
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
        Loaded
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
      Found boost_filesystem-vc80-mt-gd-1_36_NULL_THUNK_DATA
        Referenced in
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)
        Loaded
libboost_filesystem-vc80-mt-gd-1_36.lib(boost_filesystem-vc80-mt-gd-1_36.dll)

Using Dumpbin.exe I get the following:

>From the dll:

         68   43 00011E04
?throws_at_detail@filesystem_at_boost@@3Verror_code_at_system@3_at_A

>From the lib:

                  ?throws_at_detail@filesystem_at_boost@@3Verror_code_at_system@3_at_A
(class boost::system::error_code boost::filesystem::detail::throws)

It looks like the decorated names in the lib and dll match the name that is
being searched for by the linker and it looks like the linker found the lib
file.

Any ideas why this would not be linking?

Also, I have tried disabling the auto-linking (using BOOST_ALL_NO_LIB) and
linking manually, but I get the same error.

Thanks,

Doug Beatty

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