[Bug fortran/77406] New: ICE in generic_correspondence, at fortran/interface.c:1123

[gerhard.steinmetz.fortran@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77406

            Bug ID: 77406
           Summary: ICE in generic_correspondence, at
                    fortran/interface.c:1123
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerhard.steinmetz.fortran@t-online.de
  Target Milestone: ---

With invalid code, down to at least 4.8 :


$ cat z1.f90
module m
   interface s
      subroutine s1(*)
      end
      subroutine s2(*)
      end
   end interface
end
program p
   use m
end


$ gfortran-7-20160828 z1.f90
f951: internal compiler error: Segmentation fault
0xc1e32f crash_signal
        ../../gcc/toplev.c:335
0x692347 generic_correspondence
        ../../gcc/fortran/interface.c:1123
0x6932ee gfc_compare_interfaces(gfc_symbol*, gfc_symbol*, char const*, int,
int, char*, int, char const*, char const*)
        ../../gcc/fortran/interface.c:1615
0x6939f8 check_interface1
        ../../gcc/fortran/interface.c:1778
0x693c68 check_sym_interfaces
        ../../gcc/fortran/interface.c:1835
0x70a62b do_traverse_symtree
        ../../gcc/fortran/symbol.c:3930
0x696a17 gfc_check_interfaces(gfc_namespace*)
        ../../gcc/fortran/interface.c:1926
0x6f402c resolve_types
        ../../gcc/fortran/resolve.c:15505
0x6efb8c gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.c:15600
0x6db3e4 gfc_parse_file()
        ../../gcc/fortran/parse.c:6055
0x71d3a2 gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:198