What does this option do? It is accessible from the Build menu.
It deletes all the object code generated during previous compilation/build. It deletes all below kind of files:-
*.obj - object code
*.pdb - program debug databse file
*.bsc - source browser databse
*.ilk - incremental linker file
*.sbr - source browser intermediate file
*.idb - rebuild dependency file
*.lib - library file
*.exe - executable
JFYI - Even a Rebuild All command will do all this and then go on to build the complete set of source files.
-AD