Online Help Option, +help | HP C/aC++ for PA-RISC Software specification

aCC -Idir1 -Idir2 -c a.C

With view-pathing on, the following example searches for quoted include files in dir1 first and dir2 next, followed by the standard include directories, ignoring the directory of a.C. Angle-bracketed includes are searched for in dir2 first, followed by the standard include directories.

aCC -Idir1 -I- -Idir2 -c a.C

NOTE: Some of the compiler’s header files are included using double quotes. Since the -I-option redefines the search order of such includes, if any standard headers are used, it is your responsibility to supply the standard include directories (/opt/aCC/include* and /usr/ include) in the correct order in your -I-command line.

For example, when using -I-on the aCC command line, any specified -I directory containing a quoted include file having the same name as an HP-UX system header file, may cause the following possible conflict.

In general, if your application includes no header having the same name as an HP-UX system header, there is no chance of a conflict.

Suppose you are compiling program a.C with view-pathing on. a.C includes the file a.out.h which is a system header in /usr/include:

aCC -IDevelopmentDir -I- -IOfficialDir a.C

If a.C contains:

//This is the file a.C #include <a.out.h>

//...

When a.out.h is preprocessed from the /usr/include directory, it includes other files that are quote included (like #include "filehdr.h").

Since with view-pathing, quote enclosed headers are not searched for in the including file’s directory, filehdr.h which is included by a.out.h will not be searched for in a.out.h’s directory (/usr/include).

Instead, for the above command line, the system header is first searched for in DevelopmentDir, then in OfficialDir and if it is found in neither, it is finally searched for in the standard include directories, /opt/aCC/include* and /usr/include, in the latter of which it will be found.

However, if you have a file named filehdr.h in DevelopmentDir or OfficialDir, that file (the wrong file) will be found.