Customized cl+link for V.S 2010

Hello,

I wrote new cl+link from scratch in order to run a compiler + linker for another O.S.

When I compile a file, my cl is running and when I link the application,my link is running.

After running my cl,  an obj file is created and after running my link, anexe file is created.   

The problem is that when I do not do any change in the source code, and run build all files are compiled again and the exe is linked again.

V.S runs my cl on all files and then run my link.

What am I doing wrong in my link ? Where should be the feature that tells V.S 2010 not to recompile a code that was not changed ?

Thanks,

Z.V