Pragma equivalent
#pragma options [no]stdinc
Purpose
Specifies whether the standard include directories
are included in the search paths for system and user header files.
When
-qstdinc is
in effect, the compiler searches the following directories for header
files:
- The directory specified
in the configuration file for the XL C header files (this is normally /usr/vac/include/)
or by the -qc_stdinc option
- The directory specified in the configuration file for the system
header files (this is normally /usr/include/),
or by the -qc_stdinc optionor by the -qgcc_c_stdinc and -qgcc_cpp_stdinc options
When
-qnostdinc is in effect, these directories
are excluded from the search paths. The only directories to be searched
are:
- directories in which source files containing #include
"filename" directives are located
- directories specified by the -I option
- directories specified by the -qinclude option
Syntax
.-stdinc---.
>>- -q--+-nostdinc-+-------------------------------------------><
Usage
The search order of header files
is described in Directory search sequence for include files.
This
option only affects search paths for header files included with a
relative name; if a full (absolute) path name is specified, this option
has no effect on that path name.
The last valid pragma directive
remains in effect until replaced by a subsequent pragma.
Examples
To compile
myprogram.c so
that
only the directory
/tmp/myfiles (in
addition to the directory containing
myprogram.c)
is searched for the file included with the
#include “myinc.h” directive,
enter:
xlc myprogram.c -qnostdinc -I/tmp/myfiles