You can selectively include and exclude header files for PCH file processing, even if you are using automatic PCH file processing. Do this by inserting a manual header stop point using the #pragma hdrstop directive in the primary source file. Insert it before the first token that does not belong to a preprocessing directive. This enables you to specify where the set of header files that is subject to precompilation ends. For example,

#include "xxx.h"
#include "yyy.h"
#pragma hdrstop
#include "zzz.h"

In this example, the PCH file includes the processing state for xxx.h and yyy.h but not for zzz.h. This is useful if you decide that the information following the #pragma hdrstop does not justify the creation of another PCH file.