Specifies a directory to add to the start of the system include path.
- Is the directory to add to the system include path.
- The default system include path is used.
This option specifies a directory to add to the system include path. The compiler searches the specified directory for include files after it searches all directories specified by the
-Icompiler option but before it searches the standard system directories.
On Linux* systems, this option is provided for compatibility with gcc.