Hello, I found out that in case of a source like: //start of file #include "a.h" #include "b.h" //... only pch for "a.h" can be used and ignored for "b.h" and subsequent ones. I.e. if I have "b.h.gch" and do not have "a.h.gch" then "b.h.gch" will not be used. Is it supposed behavior? I did not find a word about this in online docs. Thanks, Denis.