Specify implicit USE modules.
list is a comma-separated list of module names or module file names.
Compiling with -use=module_name has the effect of adding a USE module_name statement to each subprogram or module being compiled. Compiling with -use=module_file_name has the effect of adding a USE module_name for each of the modules contained in the specified file.
See Module Files for more information about modules in Fortran.