Specifies the search order for files included with the #include "file_name" directive.
.-noidirfirst-. >>- -q--+-idirfirst---+----------------------------------------><
See also #pragma options.
Use -qidirfirst with the -I option.
The normal search order (for files included with the #include "file_name" directive) without the idirfirst option is:
With -qidirfirst, the directories specified with the -I option are searched before the directory where the current file resides.
-qidirfirst has no effect on the search order for the #include <file_name> directive.
-qidirfirst is independent of the -qnostdinc option, which changes the search order for both #include "file_name" and #include <file_name>.
The search order of files is described in Directory search sequence for include files using relative path names..
The last valid #pragma options [no]idirfirst remains in effect until replaced by a subsequent #pragma options [no]idirfirst.
To compile myprogram.c and search /usr/tmp/myinclude for included files before searching the current directory (where the source file resides), enter:
xlc myprogram.c -I/usr/tmp/myinclude -qidirfirst
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