[Bug 1187722] Re: dpkg-shlibdeps fails on armhf ELF binaries that do not define architecture specific information

[Adam Conrad]

This was fixed in both dpkg and golang, I didn't realize there was a
bug.  Tasks closed now.

** Changed in: dpkg (Ubuntu)
       Status: New => Fix Released

** Changed in: dpkg (Ubuntu)
     Assignee: (unassigned) => Adam Conrad (adconrad)

** Changed in: golang (Ubuntu)
       Status: Confirmed => Fix Released

** Changed in: golang (Ubuntu)
     Assignee: Dave Cheney (dave-cheney) => Adam Conrad (adconrad)

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Title:
  dpkg-shlibdeps fails on armhf ELF binaries that do not define
  architecture specific information

Status in “dpkg” package in Ubuntu:
  Fix Released
Status in “golang” package in Ubuntu:
  Fix Released

Bug description:
  This causes an FTBFS in golang. See:
  https://launchpad.net/ubuntu/+source/golang/2:1.1-1/+build/4578681

  Affected: dpkg 1.16.10ubuntu1
  Not affected: dpkg 1.16.10

  I believe the difference is caused by Steve McIntyre's armhf detection patch
  applied in the Ubuntu dpkg delta.

  For convenience, I attach a golang armhf binary which dpkg-shlibdeps
  doesn't work with. The error is:

  dpkg-shlibdeps: error: couldn't find library libpthread.so.0 needed by /tmp/go (ELF format: 'elf32-littlearm-sfabi'; RPATH: '')
  dpkg-shlibdeps: error: couldn't find library libc.so.6 needed by /tmp/go (ELF format: 'elf32-littlearm-sfabi'; RPATH: '')
  dpkg-shlibdeps: error: couldn't find library ld-linux-armhf.so.3 needed by /tmp/go (ELF format: 'elf32-littlearm-sfabi'; RPATH: '')
  dpkg-shlibdeps: warning: binaries to analyze should already be installed in their package's directory
  dpkg-shlibdeps: error: cannot continue due to the errors listed above
  Note: libraries are not searched in other binary packages that do not have any shlibs or symbols file.
  To help dpkg-shlibdeps find private libraries, you might need to set LD_LIBRARY_PATH.

  The cause is that "readelf -A -- /tmp/go" doesn't produce any output. The
  arm-specific handling in Dpkg::Shlibs::Objdump then errnoneously decides that
  this means that the binary is "elf32-littlearm-sfabi", which mismatches its
  dependencies.  This causes it to fail, when in fact there is no problem with
  the binary's linkage or execution.

  Is it a requirement for armhf binaries to have Tag_ABI_VFP_args? I'm not sure
  whether the ABI spec actually requires this in order for a binary to be
  expected to dynamically link against a libc that does declare the tag. Even if
  so, does it make sense for dpkg to handle this condition more gracefully?

  Is there a spec which defines a requirement to have Tag_ABI_VFP_args set, so
  that we may refer golang upstream to it for a fix? Or is golang producing valid
  binaries and dpkg-shlibdeps is buggy?

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