unresolved external

rabehehbahreini · Post by **rabehehbahreini** » Sat Mar 14, 2009 3:49 pm

hi.
I have to compile and run irrlicht from C++ builder 6.
when I try to compile helloword example I receive this error :
[Linker Error] Unresolved external 'irr::createDevice(irr::video::E_DRIVER_TYPE, const irr::core::dimension2d<int>&, unsigned int, bool, bool, bool, irr::IEventReceiver *, const char *)' referenced from F:\VISUALIZER\IRRLICHT-1.4\EXAMPLES\01.HELLOWORLD\MAIN.OBJ

How can I fix this error ?

bitplane · Post by **bitplane** » Sat Mar 14, 2009 4:45 pm

You need to configure your linker settings.
This isn't a problem with Irrlicht, moving to beginners help.

rabehehbahreini · Post by **rabehehbahreini** » Sun Mar 15, 2009 5:19 am

I have changed my linker settings several times but nothing changed

vitek · Post by **vitek** » Sun Mar 15, 2009 5:33 am

I'm not certain, but it is quite possible that you're linking the wrong Irrlicht library (you most likely need to link to the .lib file) or you're not linking to the Irrlicht library at all. If that is not the case I'd guess that there is some link incompatibility between the Irrlicht library you're trying to link to and the object code that you've created (not incredibly likely, but I'm not familiar with the Borland compiler).

I know that the dumpbin tool that ships with the Microsoft compiler can be used to get a list of exports from a library and dependencies of an object file. You could use a tool like this to ensure that the object code you've generated is trying to locate the same symbols that are defined in the Irrlicht library.

Travis

rabehehbahreini · Post by **rabehehbahreini** » Sun Mar 15, 2009 5:37 am

I am not a very proffesional programmer , but I can build and run the same .lib file with VC 2008 and every thing is ok.

overburn · Post by **overburn** » Sun Mar 15, 2009 8:53 am

it's definitely a linking problem.
did you include the path to irrlicht.lib in the compiler options?
you could try #pragma comment(lib,"Irrlicht.lib") if you haven't already

rabehehbahreini · Post by **rabehehbahreini** » Sun Mar 15, 2009 9:08 am

yes, i included both the .h and .lib files. and the pragma command, still it doesn't work .

vitek · Post by **vitek** » Sun Mar 15, 2009 3:50 pm

You don't include a lib file, you link it, but I'm assuming that is just your misuse of the terminology.

If your linker is indeed finding the lib file, but it does not see the exported symbol, then there is some incompatibility between the pre-built Irrlicht library and the generated object code. I believe that the easy way to fix this is to build the Irrlicht library with the Borland compiler, but I don't know how much work that would be considering that it isn't one of the supported configurations.

Travis

rabehehbahreini · Post by **rabehehbahreini** » Mon Mar 16, 2009 2:57 am

you are right. there is incompatibility between lib files in VC and builder.

rabehehbahreini · Post by **rabehehbahreini** » Mon Mar 16, 2009 8:14 am

I don't know the right .def file which is compatible with borland standard.
IMPLIb fails when I attempt to convert .lib file .
Do you know how to convert it ?