[Bug fortran/91587] New: ICE in gfc_resolve_filepos, at fortran/io.c:2913

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91587

            Bug ID: 91587
           Summary: ICE in gfc_resolve_filepos, at fortran/io.c:2913
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

With invalid code down to at least gfortran-5 :


$ cat z1.f90
program p
   backspace (err=!)
   endfile (err=!)
   flush (err=!)
   rewind (err=!)
end


$ gfortran-10-20190825 -c z1.f90
f951: internal compiler error: Segmentation fault
0xb3acef crash_signal
        ../../gcc/toplev.c:326
0x640d4f gfc_resolve_filepos(gfc_filepos*, locus*)
        ../../gcc/fortran/io.c:2913
0x685cff gfc_resolve_code(gfc_code*, gfc_namespace*)
        ../../gcc/fortran/resolve.c:11701
0x687ca7 resolve_codes
        ../../gcc/fortran/resolve.c:16921
0x687d6e gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.c:16956
0x67581c resolve_all_program_units
        ../../gcc/fortran/parse.c:6073
0x67581c gfc_parse_file()
        ../../gcc/fortran/parse.c:6320
0x6bf60f gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:204