To suppress PCH file processing, use the #pragma no_pch directive in the primary source file. You do not have to place this directive at the beginning of the file for it to take effect. For example, no PCH file is created if you compile the following source code with armcc --create_pch=foo.pch myprog.c:

#include "xxx.h"
#pragma no_pch
#include "zzz.h"

If you want to selectively enable PCH processing, for example, subject xxx.h to PCH file processing, but not zzz.h, replace #pragma no_pch with #pragma hdrstop, as follows:

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