[Bug binutils/19632] [2.26 Regression] ar has stopped supporting empty members

[doko at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=19632

Matthias Klose <doko at debian dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amodra at gmail dot com
            Summary|[2.26 Regression] ar ra     |[2.26 Regression] ar has
                   |leaves a malformed archive  |stopped supporting empty
                   |                            |members

--- Comment #1 from Matthias Klose <doko at debian dot org> ---
[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813006#31]

"""
I took a look at this, and I think this is a regression probably due
to commit 4978e369fb75a8b7756bf4201668b2a9d9556286. The actual problem
is not that the archives generated are garbled, but that the parser is
broken when finding 0-sized members:

  ,---
  $ touch empty
  $ echo text >filled
  $ ar qcf test.a filled empty
  $ ar tv test.a
  ar: test.a: Malformed archive
  `---
"""

commit 4978e369fb75a8b7756bf4201668b2a9d9556286
Author: Alan Modra <address@hidden>
Date:   Wed Nov 18 22:12:23 2015 +1030

    Prevent looping in archives

        PR 19256
        * archive.c (bfd_generic_openr_next_archived_file): Don't allow
        backward file movement via "negative" sizes.
        * coff-alpha.c (alpha_ecoff_openr_next_archived_file): Likewise.

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