[Bug symtab/22003] New: Incompatibility with -gdwarf-5 - DW_FORM_implicit_const

["jan.kratochvil at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22003

            Bug ID: 22003
           Summary: Incompatibility with -gdwarf-5 -
                    DW_FORM_implicit_const
           Product: gdb
           Version: 8.0
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: jan.kratochvil at redhat dot com
  Target Milestone: ---

DWARF-5 implemented in 8.0 has a bug:

-gdwarf-4:
ptype logical
type = const char [2]
(gdb) PASS: gdb.base/constvars.exp: ptype logical

-gdwarf-5:
ptype logical
type = const char []
(gdb) FAIL: gdb.base/constvars.exp: ptype logical

 <2><2fc>: Abbrev Number: 1 (DW_TAG_variable)
    <2fd>   DW_AT_name        : (indirect string, offset: 0x2eb): logical
    <301>   DW_AT_decl_file   : 1

   1      DW_TAG_variable    [no children]
    DW_AT_name         DW_FORM_strp
    DW_AT_decl_file    DW_FORM_implicit_const: 1

During symbol reading, invalid attribute class or form for
'DW_FORM_implicit_const' in '(null)'.

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