[Bug binutils/30699] objcopy: '--only-keep-debug for ELF relocatables' test fails

[nickc at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=30699

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nickc at redhat dot com
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at sourceware dot org   |nickc at redhat dot com

--- Comment #3 from Nick Clifton <nickc at redhat dot com> ---
Hi Sam,

  The test appears to be failing because it thinks that the .debug_macro
sections,
  and their associated .rela.debug_macro sections do not contain debug
information
  and as a result, should not appear (with contents) in a file that has been 
  stripped of everything but debugging:

    Expected SHT_NOBITS type for .debug_macro
    Expected SHT_NOBITS type for .rela.debug_macro
    FAIL: --only-keep-debug for ELF relocatables

  The reason that the test thinks that these sections do not contain debug info
  is because they are part of a section group.  The test code runs readelf over
  the before-being-stripped version of the file and looks for any section with
  either the ALLOC or GROUP flags set.  Any such section found is added to a 
  list of non-debug sections:

        if { $type != "NOTE" && [regexp {[AG]} $flag] } {
            lappend non_debug_sections $name

  But two of the .debug_macro sections are part of a group: 

  [14] .debug_macro      PROGBITS  0000000000000000 00070f 00001a 00      0   0
 1
  [15] .rela.debug_macro RELA      0000000000000000 001ed8 000048 18   I 29  14
 8
  [16] .debug_macro      PROGBITS  0000000000000000 000730 000038 00  GC  0   0
 8
  [17] .rela.debug_macro RELA      0000000000000000 001f20 0028f8 18  IG 29  16
 8
  [18] .debug_macro      PROGBITS  0000000000000000 000768 000028 00   G  0   0
 1
  [19] .rela.debug_macro RELA      0000000000000000 004818 000090 18  IG 29  18
 8

  (I assume that this is normal behaviour for gcc when it is creating
.debug_macro
  sections).

  So I think that the logic in proc keep_debug_symbols_for_elf_relocatable 
  in binutils/testsuite/binutils-all/objcopy.exp needs to be updated.

  Would it be possible for you to upload a copy of the unstriped version of
  testprog.o that is triggering these results ?  The version of gcc that I
  am using does not generate .debug_macro sections, so I cannot test any
changes
  that I make using my own compiler.

Cheers
  Nick

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