[Bug 1751278] Re: dbgsym packages are generated iff DH_BUILD_DDEBS is set

[Adam Conrad]

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

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Title:
  dbgsym packages are generated iff DH_BUILD_DDEBS is set

Status in debhelper package in Ubuntu:
  Fix Released

Bug description:
  A user trying to rebuild a Debian package of us ran into the problem
  that he didn't get debug packages any longer. (The original bug report
  and discussion around it is available at
  https://github.com/sipwise/rtpengine/issues/459 )

  In Ubuntu's debhelper changelog I found:

  debhelper (9.20160115ubuntu2) xenial; urgency=medium

    * dh-strip: Adjust reversion of commit f1a803456 to account for the recent
      ENABLE_DDEBS → ENABLE_DBGSYM rename. This actually disables -dbgsym
      generation by dh_strip by default again. (LP: #1535949)

  This matches what's documented under the "Ubuntu" section at https://wiki.debian.org/AutomaticDebugPackages
  This doesn't seem to really match what's documented in Ubuntu's dh_strip manpage though:

         --automatic-dbgsym, --no-automatic-dbgsym
             Control whether dh_strip should be creating debug symbol packages when possible.

             The default is to create debug symbol packages.

  In Ubuntu's dh_strip implementation I stumbled upon:

    $dh{ENABLE_DBGSYM} = 0 if not $ENV{'DH_BUILD_DDEBS'};

  So only if DH_BUILD_DDEBS is set then dbgsym packages are generated,
  and indeed this has been verified by the original bug reporter on
  Ubuntu Server 16.04.3 LTS.

  So the documentation seems to be wrong/incomplete. Probably it would
  also make sense to switch the default around, to by default
  automatically generate the dbgsym packages, so that users get a more
  consistent behavior. You could then force it to off on Ubuntu's build
  daemons instead, if that's relevant.

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