The %LOC construct returns the memory address of a storage item. It is used for interoperability with other languages.
This feature is present in g77: http://gcc.gnu.org/onlinedocs/gcc-3.4.4/g77/_0025LOC_0028_0029.html#g_t_0025LOC_0028_0029 -- Summary: %LOC construct not implemented Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: enhancement Priority: P2 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: p dot w dot draper at durham dot ac dot uk CC: gcc-bugs at gcc dot gnu dot org GCC target triplet: i386-redhat-linux http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23064