[Bug fortran/83980] New: Various issues with character length in array constructors

[anlauf at gmx dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83980

            Bug ID: 83980
           Summary: Various issues with character length in array
                    constructors
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: anlauf at gmx dot de
  Target Milestone: ---

Not sure if this one is tracked elsewhere.  I started to look closer after
the obvious and necessary fix for pr83874 went in.

program gfcbug147
  implicit none
  type t_obstyp
    character(len=8) :: name
  end type t_obstyp
  type (t_obstyp) ,parameter :: obstyp(2)= &
     [ t_obstyp ('TEMP'  ), &
       t_obstyp ('RADAR' )  ]
  character(len=8), parameter :: s1(*) = obstyp% name   ! OK
  character(len=*), parameter :: s2(2) = obstyp% name   ! Error or ICE
  character(len=*), parameter :: s3(*) = obstyp% name   ! Error or ICE
end program gfcbug147

With 8.0 trunk rev. 256935 I get the following errors for the indicated
lines:

gfcbug147.f90:8:17:

        t_obstyp ('RADAR' )  ]
                 1
Error: Different CHARACTER lengths (4/5) in array constructor at (1)
gfcbug147.f90:8:17:

        t_obstyp ('RADAR' )  ]
                 1
Error: Different CHARACTER lengths (4/5) in array constructor at (1)

Same for 5.0 and earlier.

With 6.0 and 7.2.0 I get ICEs.  E.g.

% gfc-7 gfcbug147.f90
f951: internal compiler error: Segmentation fault
0x879abb0 crash_signal
        ../../gcc-7.2.0/gcc/toplev.c:337
0x8287d29 add_init_expr_to_sym
        ../../gcc-7.2.0/gcc/fortran/decl.c:1678
0x82914d1 variable_decl
        ../../gcc-7.2.0/gcc/fortran/decl.c:2432
0x82914d1 gfc_match_data_decl()
        ../../gcc-7.2.0/gcc/fortran/decl.c:4888
0x82ef131 match_word
        ../../gcc-7.2.0/gcc/fortran/parse.c:65
0x82ef131 match_word
        ../../gcc-7.2.0/gcc/fortran/parse.c:54
0x82f1c81 decode_statement
        ../../gcc-7.2.0/gcc/fortran/parse.c:376
0x82f1c81 decode_statement
        ../../gcc-7.2.0/gcc/fortran/parse.c:295
0x82f344c next_free
        ../../gcc-7.2.0/gcc/fortran/parse.c:1223
0x82f344c next_statement
        ../../gcc-7.2.0/gcc/fortran/parse.c:1455
0x82f4c9f parse_spec
        ../../gcc-7.2.0/gcc/fortran/parse.c:3829
0x82f6cb3 parse_progunit
        ../../gcc-7.2.0/gcc/fortran/parse.c:5632
0x82f7fbb gfc_parse_file()
        ../../gcc-7.2.0/gcc/fortran/parse.c:6160
0x833ce33 gfc_be_parse_file
        ../../gcc-7.2.0/gcc/fortran/f95-lang.c:204