[Bug gas/28102] New: [gas, --gdwarf-5] Duplicate file and dir

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28102

            Bug ID: 28102
           Summary: [gas, --gdwarf-5] Duplicate file and dir
           Product: binutils
           Version: 2.38 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Consider test-case ./tui-layout-asm-short-prog.s (based on
gdb/testsuite/gdb.tui/tui-layout-asm-short-prog.S):
...
$ cat ./tui-layout-asm-short-prog.s
        .global _start
_start:
        .rept 5
        nop
        .endr
...

Assembled and dwarf-5 generated:
...
$ ~/binutils/install/bin/as --gdwarf-5 --64 -o o.o
./tui-layout-asm-short-prog.s
...

We have:
...
$ readelf -wl o.o
  ...
 The Directory Table (offset 0x22, lines 2, columns 1):
  Entry Name
  0     (indirect line string, offset: 0x0): .
  1     (indirect line string, offset: 0x2): .

 The File Name Table (offset 0x30, lines 2, columns 2):
  Entry Dir     Name
  0     0       (indirect line string, offset: 0x4):
tui-layout-asm-short-prog.s
  1     1       (indirect line string, offset: 0x20):
tui-layout-asm-short-prog.s
...

In other words, we've got duplicate directories and duplicate files.

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