If dir begins with =, then the = will be replaced by the sysroot prefix see -sysroot and -isysroot.
If the directory dir is a standard system include directory, the option is ignored to ensure that the default search order for system directories and the special treatment of system headers are not defeated. Directories named by -I are searched before the standard system include directories. searches the 'system' paths, while '.' searches both the system an 'local' paths.Īdd the directory dir to the list of directories to be searched for header files. The proper distinction is exactly what paths are searched for the include files.
