None.
Searches for the specified library file. For static and dynamic linking, the linker searches for libkey.a. For runtime linking with the -brtl option, the linker searches for libkey.so, and then libkey.a if libkey.so is not found.
The compiler default is to search only for some of the compiler runtime libraries. The default configuration file specifies the default library names to search for with the -l compiler option, and the default search path for libraries with the -L compiler option.
This option is passed directly to the ld command and is not processed by XL Fortran at all.