Upgrading VC++ project from VS 2008 to VS 2010

Question

I was upgrading a project from VS 2008 to VS 2010. I ran into following unresolved link error.

LINK : error LNK2001: unresolved external symbol __forceCRTManifestCUR

After doing some web search on the error...following link did point me into right direction.

http://social.msdn.microsoft.com/Forums/da-DK/vcgeneral/thread/af6796af-a1bf-4904-9923-15101956d882

But adding "int __forceCRTManifestCUR=0;" this to main file didn't work for me.

What I found out is that my original VS 2008 project properties under Linker->Command Line had additional option of /include:__forceCRTManifestCUR. This option worked fine in VS 2008 build but was giving link error in VS 2010.

After taking out this option, I was able to compile fine in VS 2010.

Question I have is...

1. What this include option /include:__forceCRTManifestCUR does? and
2. why it doesn't work in VS 2010?

Answer 1

Seems you have to write

extern "C" int _forceCRTManifestCUR=0 

for it to work in C++, the original article forgets to mention this.