Re: [osg-users] osgDB ifstream / ofstream conflict

[Florian Kolbe]

Hi,

I am now running against the same issue.
I checked to see that everything is compiled with /MD.
I'm trying to build osg 3.2.0 x64 with VS2012

- 3rd-Party Binaries from: www.helleboreconsulting.com/index.php/open-source/openscenegraph
- OSG built by myself
- my project runs into:


Code:
4>* CIL library *(* CIL module *) : error LNK2005: "public: void __cdecl std::basic_ifstream<char,struct std::char_traits<char> >::close(void)" (?close@?$basic_ifstream@DU?$char_traits@D@std@@@std@@QEAAXXZ) already defined in osgDBrd.lib(osg100-osgDBrd.dll)
4>* CIL library *(* CIL module *) : error LNK2005: "public: void __cdecl std::basic_ofstream<char,struct std::char_traits<char> >::close(void)" (?close@?$basic_ofstream@DU?$char_traits@D@std@@@std@@QEAAXXZ) already defined in osgDBrd.lib(osg100-osgDBrd.dll)
4>..\..\..\setup\bin\sphinx-api3d-lib.dll : fatal error LNK1169: one or more multiply defined symbols found



Interestingly - it is again osgDB...

Regards,
Florian

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[Sebastian Messerschmidt]

Hi Florian,

You can get around the fatal error by adding /FORCE: MULTIPLE to your
linker options.
This seems to be some odd VS2010 and beyond conformance problem.

Basically I get this error in almost any application linking to osgDB
and using fstream. It is somehow related to the derived stream class and
its virtual functions.

cheers
Sebastian

[Braden Edmunds]

I had the same problem with VS2010 and there are two ways to get around it.

1. Use /FORCE:multiple
2. Create a typdef:


Code:

#pragma once

// Compatibility layer for VS2010 bug. The compiler tries to link the same
// multiple symbols in for the OSG fstream classes which inherit from the STL
// classes. The workaround is to use OSG fstream classes in all places rather
// than STL.

#ifdef WIN32

// Replace STL fstream with OSG fstream
#include <osgDB/fstream>
#define ifstream osgDB::ifstream
#define ofstream osgDB::ofstream

#else

#include <fstream>
#define ifstream std::ifstream
#define ofstream std::ofstream




Cheers,
Braden

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=56510#56510

[Florian Kolbe]

Hi,

so far, "/FORCE:multiple" has worked for me.

Thank you!

Cheers,
Florian

------------------
Read this topic online here:

http://forum.openscenegraph.org/viewtopic.php?p=56555#56555