[Bug binutils/21191] New: objcopy --only-keep-debug creates non-monotonically increasing section offsets

[rguenth at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21191

            Bug ID: 21191
           Summary: objcopy --only-keep-debug creates non-monotonically
                    increasing section offsets
           Product: binutils
           Version: 2.29 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: rguenth at gcc dot gnu.org
  Target Milestone: ---

int main()
{
}

> gcc t.c -g
> objcopy --only-keep-debug a.out a.out.debug
> readelf -S a.out 
There are 39 section headers, starting at offset 0x2788:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .interp           PROGBITS         0000000000400238  00000238
       000000000000001c  0000000000000000   A       0     0     1
  [ 2] .note.ABI-tag     NOTE             0000000000400254  00000254
       0000000000000020  0000000000000000   A       0     0     4
  [ 3] .note.gnu.build-i NOTE             0000000000400274  00000274
       0000000000000024  0000000000000000   A       0     0     4
  [ 4] .hash             HASH             0000000000400298  00000298
       0000000000000018  0000000000000004   A       6     0     8
  [ 5] .gnu.hash         GNU_HASH         00000000004002b0  000002b0
       000000000000001c  0000000000000000   A       6     0     8
  [ 6] .dynsym           DYNSYM           00000000004002d0  000002d0
...
  [25] .got.plt          PROGBITS         0000000000601000  00001000
       0000000000000020  0000000000000008  WA       0     0     8
  [26] .data             PROGBITS         0000000000601020  00001020
       0000000000000010  0000000000000000  WA       0     0     8
  [27] .bss              NOBITS           0000000000601030  00001030
       0000000000000008  0000000000000000  WA       0     0     1
  [28] .comment          PROGBITS         0000000000000000  00001030
       0000000000000018  0000000000000001  MS       0     0     1
  [29] .debug_aranges    PROGBITS         0000000000000000  00001050
       0000000000000130  0000000000000000           0     0     16
  [30] .debug_info       PROGBITS         0000000000000000  00001180
       000000000000036d  0000000000000000           0     0     1


> readelf -S a.out.debug 
There are 39 section headers, starting at offset 0x19e8:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .interp           NOBITS           0000000000400238  00000238
       000000000000001c  0000000000000000   A       0     0     1
  [ 2] .note.ABI-tag     NOTE             0000000000400254  00000254
       0000000000000020  0000000000000000   A       0     0     4
  [ 3] .note.gnu.build-i NOTE             0000000000400274  00000274
       0000000000000024  0000000000000000   A       0     0     4
  [ 4] .hash             NOBITS           0000000000400298  00000298
       0000000000000018  0000000000000004   A       6     0     8
  [ 5] .gnu.hash         NOBITS           00000000004002b0  00000298
       000000000000001c  0000000000000000   A       6     0     8
  [ 6] .dynsym           NOBITS           00000000004002d0  00000298
...
  [25] .got.plt          NOBITS           0000000000601000  00000e00
       0000000000000020  0000000000000008  WA       0     0     8
  [26] .data             NOBITS           0000000000601020  00000e00
       0000000000000010  0000000000000000  WA       0     0     8
  [27] .bss              NOBITS           0000000000601030  00000e00
       0000000000000008  0000000000000000  WA       0     0     1
  [28] .comment          PROGBITS         0000000000000000  00000298
       0000000000000018  0000000000000001  MS       0     0     1
  [29] .debug_aranges    PROGBITS         0000000000000000  000002b0
       0000000000000130  0000000000000000           0     0     16
  [30] .debug_info       PROGBITS         0000000000000000  000003e0
       000000000000036d  0000000000000000           0     0     1

notice how section 28 and 29 start before section 27.

eu-strip gets this correct.

checked 2.27 and git HEAD.

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