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|Home > Getting Started with the Compiler > Compiler search rules and the current place|
By default, the compiler uses Berkeley UNIX search rules, so source files and
#include header files are searched for relative to the current place. The current place is the directory containing the source or header file currently being processed by the compiler.
When a file is found relative to an element of the search
path, the directory containing that file becomes the new current
place. When the compiler has finished processing that file, it restores the
previous current place. At each instant there is a stack of current
places corresponding to the stack of nested
For example, if the current place is the include directory
and the compiler is seeking the include file sys\defs.h,
it locates ...\include\sys\defs.h if it exists.
When the compiler begins to process defs.h,
the current place becomes
file included by defs.h that is not specified
with an absolute path name, is searched for relative to
The original current place
restored only when the compiler has finished processing defs.h.
You can disable the stacking of current places by using the
--kandr_include. This option makes the
compiler use Kernighan and Ritchie search rules whereby each nonrooted user
searched for relative to the directory containing the source file
that is being compiled.