[Bug binutils/29523] i686-w64-mingw32-objdump -WL returns incorrect file paths

[ralf.habacker at freenet dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=29523

--- Comment #2 from Ralf Habacker <ralf.habacker at freenet dot de> ---
objdump -Wi ../output/test.exe dumps

 <0><251a>: Abbrev Number: 9 (DW_TAG_compile_unit)
    <251b>   DW_AT_producer    : GNU C17 12.1.0 -mtune=generic
-march=pentiumpro -g
    <254e>   DW_AT_language    : 29     (C11)
    <254f>   DW_AT_name        : (indirect line string, offset: 0x20c):
../test.c
    <2553>   DW_AT_comp_dir    : (indirect line string, offset: 0x1e9):
/home/ralf/src/test-binutils/build

and objdump -Wl ../output/test.exe dumps

The Directory Table (offset 0x4ab, lines 3, columns 1):
  Entry Name
  0     (indirect line string, offset: 0x216): /home/<user>/test-binutils/build
  1     (indirect line string, offset: 0x239): ..
  2     (indirect line string, offset: 0x23c):
/usr/i686-w64-mingw32/sys-root/mingw/include

 The File Name Table (offset 0x4bd, lines 4, columns 2):
  Entry Dir     Name
  0     1       (indirect line string, offset: 0x269): test.c
  1     2       (indirect line string, offset: 0x270): stdio.h
  2     1       (indirect line string, offset: 0x278): test.c
  3     2       (indirect line string, offset: 0x27f): vadefs.h

which shows that -Wl drops '../' from the file name generating an invalid path. 

If the filename table really contains only the filename, the path with index 0
in the directory table should be '/home/<user>/test-binutils/build/...' ->
'/home/<user>/test-binutils'.

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