None.
At link time, writes search paths for shared libraries into the executable, so that these directories are searched at program run time for any required shared libraries.
The default is to include only the standard directories. See the compiler configuration file for the directories that are set by default.
If the -Rdirectory_path option is specified both in the configuration file and on the command line, the paths specified in the configuration file are searched first at run time.
The -R compiler option is cumulative. Subsequent occurrences of -R on the command line do not replace, but add to, any directory paths specified by earlier occurrences of -R.
None.
xlc myprogram.c -lspfiles -R/usr/tmp/old