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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/101575] [gcc-11, -gdwarf-4] Missing .file <n> directive
 causes invalid line info
Date: Sat, 24 Jul 2021 11:21:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101575

--- Comment #12 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to Eric Botcazou from comment #1)
> Not going to be fixed, just stick to the default setting (DWARF 5).

one minor remark, while working on a patch, I became aware,
that probably the same will happen when using -gdwarf-5=20
with old binutils, since we have this code in dwarf2out.c:

#if defined(HAVE_AS_GDWARF_5_DEBUG_FLAG) &&
defined(HAVE_AS_WORKING_DWARF_N_FLAG)
  if (output_asm_line_debug_info () && dwarf_version >=3D 5)
    {
      /* When gas outputs DWARF5 .debug_line[_str] then we have to
         tell it the comp_dir and main file name for the zero entry
         line table.  */
      const char *comp_dir, *filename0;

      comp_dir =3D comp_dir_string ();
      if (comp_dir =3D=3D NULL)
        comp_dir =3D "";

      filename0 =3D get_AT_string (comp_unit_die (), DW_AT_name);
      if (filename0 =3D=3D NULL)
        filename0 =3D "";

      fprintf (asm_out_file, "\t.file 0 ");
      output_quoted_string (asm_out_file, remap_debug_filename (comp_dir));
      fputc (' ', asm_out_file);
      output_quoted_string (asm_out_file, remap_debug_filename (filename0));
      fputc ('\n', asm_out_file);
    }
#endif=