Commit: Fix dir[0] in DWARF-5 line tables

[Nick Clifton]

Hi Guys,

  It was recently reported that when GAS is generating DWARF-5 format
  directory tables the 0'th entry in the table can be a relative path,
  or in fact pretty much anything.  The DWARF standard however requires
  that the entry matches the DW_AT_comp_dir entry in the associated
  .debug_info for the CU.  (See the description of the directories field
  in section 6.2 of the DWARF-5 spec).

  So I am going to apply the patch below to fix the problem.  

Cheers
  Nick

gas/ChangeLog
2021-08-09  Nick Clifton  <nickc@redhat.com>

	* dwarf2dbg.c (get_directory_table_entry): Ensure that dir[0]
	contains current working directory.
	(out_dir_and_file_list): Likewise.
	* testsuite/gas/elf/dwarf-5-dir0.s: New test source file.
	* testsuite/gas/elf/dwarf-5-dir0.d: New test driver.
	* testsuite/gas/elf/elf.exp: Run the new test.
	* testsuite/gas/elf/dwarf-5-file0.d: Adjust expected output.
	* testsuite/gas/i386/dwarf5-line-1.d: Likewise.
	* testsuite/gas/i386/dwarf5-line-2.d: Likewise.

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