Hi,
This seems to be the same / related to an issue raised some time ago with
VS2010.
When I build VirtualPlanetBuilder with VS2010 I get errors complaining about
duplicate definitions of the stream destructors (cant remember the details of
hand). The same code works without issue on non-windows platforms and all other
VS compilers tried.
As I don't have time to look into the issue I simply force the link to complete
with multiply defined symbols.
A quick search through my local OSG-users archive found the thread + message
included bellow. Do a search through the archives around this topic and you
should find all the details.
Cheers,
Brad
Re: [osg-users] OT: VS2010 LNK2005 problem related to ostringstream
Ok, I have localized the problem.
For example, the class osgDB::fstream:
class OSGDB_EXPORT fstream : public std::fstream
{
};
which just inherits from std:.fstream causes the symbols of std::fstream to be
exposed into osgDB.dll
This effectively means that It might cause problems for people linking against
osgDB.dll later on.
Same goes for inheriting from std::string, std::ostringstream etc.
This must obviously be a bug, a very serious one in VS2010.
We had a class derived from std::ostringstream, which exposed the symbols in
the vtable for the class:
namespace ns
{
class Notify : public std::ostringstream
{
};
}
Using depends.exe to analyze the dll-file gives:
const ns::Notify::`vftable'{for `std::basic_ostringstream<char,struct
std::char_traits<char>,class std::allocator<char> >'}
My issue was reported to the msdn forum. Their first take was: Oh you use
CMake, thats not our product :-)
But in later threads, they tried to reproduce the problem without luck...
So if you manage to reproduce this in a small example, go ahead and post it. We
must make them aware of this problem.
http://social.msdn.microsoft.com/Forums/en-US/vclanguage/thread/191de00a-53c9-4bd9-9cb6-e844eb224ca2
/Anders
From: [email protected]
[mailto:[email protected]] On Behalf Of Vincent
Bourdier
Sent: Wednesday, 27 April 2011 11:47 PM
To: osg user
Subject: Re: [osg-users] osgDB ifstream / ofstream conflict
Hi,
Sorry to insist but I would appreciate any advices about this issue. Maybe I'm
the only one who encountered it, but the patch I did is not so... "clean" to my
mind...
Thanks.
Regards,
Vincent.
Le 21/04/2011 14:50, Vincent Bourdier a écrit :
Hi all,
I just found a fix after some tests, but it is not a fix I am proud of.
I just added the close() method in osgDB/fstream implementation, so there is no
conflict because my fstream implementation uses osgDB/fstream and not
osgDB/fstream AND std::fstream.
I will continue to investigate to be sure to understand why this occurs, but
any advices or explanations are welcome.
If my fix is accepted this could be a submission for OSG, eventually...
Thanks.
Regards,
Vincent.
Le 20/04/2011 14:54, Vincent Bourdier a écrit :
Hi Mourad
Thanks for your answer but I already checked that. TsLib_MDdNET2010 is a static
lib but linked with /MD(d), like my application...
Vincent.
Le 20/04/2011 11:50, Mourad Boufarguine a écrit :
Hi Vincent,
On Mon, Apr 4, 2011 at 4:36 PM, Vincent Bourdier
<[email protected]<mailto:[email protected]>> wrote:
2>TsLib_MDdNET2010.lib(IwPoly.obj) : error LNK2005: "public: void __thiscall
std::basic_ifstream<char,struct std::char_traits<char> >::close(void)"
(?close@?$basic_ifstream@DU?$char_traits@D@std@@@std@@QAEXXZ) already defined
in osgDBd.lib(osg65-osgDBd.dll)
2>TsLib_MDdNET2010.lib(IwBrepData.obj) : error LNK2005: "public: void
__thiscall std::basic_ifstream<char,struct std::char_traits<char>
>::close(void)" (?close@?$basic_ifstream@DU?$char_traits@D@std@@@std@@QAEXXZ)
already defined in osgDBd.lib(osg65-osgDBd.dll)
It seems like a static/dynamic c++ runtime conflict. Check if osg and
TsLib_MDdNET2010 are linked against the same type of c++ runtime (both with
/MTd flag or both with /MDd flag)
Mourad
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