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# OpenGL unresolved external symbol problem

## 32 posts in this topic

I deleted all thing related to openGl from VC directory and put it in an external folder and i linked to them. Didnt change . :( what is the problem?

http://uploadboy.com/6bppjiz6kpx2.html


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1. You still have "glew32.lib" listed under "C/C++ > General > Additional Include Directories". This field is not meant for libraries or even files. In there you put, directories (not files!) where the compiler should look for files to #include in addition to the default ones (i.e. the place where Microsoft C++ implementation is and the folder of your own code).

2. Under "Linker > General > Additional Library Directories" you have also listed "glew32.lib". Again, this field is not for files. In there you put the directories (not files!) where the linker should look for the libraries (which you specify under "Linker > Input > Additional Dependencies").

So, if you remove the entry from "C/C++ > General > Additional Include Directories" and change the one in "Linker > General > Additional Library Directories" to the path to your glew32.lib (without filename) it should work.

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i changed my IDE to VS 2012 and did everething you said (same error) :

(VS 2012)

D:\OpenGl-Files\Files\lib;%(AdditionalLibraryDirectories)


kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;glew32.lib;%(AdditionalDependencies)

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i replaced glew X64 lib files with win32 glew lib files and i got an error : 0xc0000007b (something like this i'm not sure about 0s )  i searched and i gained it has something to do with X64 and X32 i don't know why. my system is x64 how can i fix the problem ?

other errors :

'test.exe': Loaded 'C:\Windows\SysWOW64\ntdll.dll', Cannot find or open the PDB file
'test.exe': Loaded 'C:\Windows\SysWOW64\kernel32.dll', Cannot find or open the PDB file
'test.exe': Loaded 'C:\Windows\SysWOW64\KernelBase.dll', Cannot find or open the PDB file


the exact error(this error is in a message box after building program) :

the application was unable to start correctly (0xc0000007b).

Edited by haykan648
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That suggests linking works fine now and you are just stuck with runtime errors. Have you verified that glewInit is called at the correct time and succeeds? Have you verified that the functionality you want to use is actually provided by your driver?

Also, you should learn enough about debugging an application to find the line where this error happens.
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Linking with the gnu linker ld has some issues about the order the libraries are on the command line. MS linker do a recursive linking, means go along the named libraries as often as there are unresolved symbols.

ld does not.

If you habe -lgl -lglew then glew may add symbols that need imported from gl but because gl has already been used you get an unresolved external message.

To come around this behaviour of ld surround the list of libraries with --start-group --end-group parameter. Then ld goes along the libraries between these tags as long as needed to resolve all externals, stopping if no more symbols can be resolved.

If you call the gcc or g++ compiler driver to do the linking newer versions of gcc/g++, dont know the version number yet, accept -Wl,--start-group   -Wl,--end-group to build library groups.

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That suggests linking works fine now and you are just stuck with runtime errors. Have you verified that glewInit is called at the correct time and succeeds? Have you verified that the functionality you want to use is actually provided by your driver?

I tried glewInit And it worked Thank you! . Thank  you all.

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glewinit initializes all extensions defined in glew.h

Posted 03 June 2014 - 08:22 PM

WiredCat, on 03 Jun 2014 - 6:37 PM, said:

PFNGLMULTIDRAWELEMENTSPROC glMultiDrawElements; //name it whatever you want

and in cpp file: you need to initalize it

Its more than 10000 Lines where should i add it?

you should add it after creating opengl context, (usually in glinit function)

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