[Bug 1623256] Re: adjust the way to create dbgsym packages like Debian does

[Martin Pitt]

Sorry about the env var confusion -- in fact $ENABLE_DBGSYM is an
internal variable in dh_strip, so that's definitively wrong.
$DH_BUILD_DDEBS is still present in our version of debhelper:

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

but got dropped in Debian, so let's not use that either. The manpage
documents

        The automatic creation of debug symbol packages can also be prevented by adding noautodbgsym to the DEB_BUILD_OPTIONS
       environment variable.  However, dh_strip will still add debuglinks to ELF binaries when this flag is set.  This is to ensure
       that the regular deb package will be identical with and without this flag (assuming it is otherwise "bit-for-bit"
       reproducible).

So let's use that then?

> We'll probably have to keep /CurrentlyBuilding around for a while.

Yes, indeed. At some point we might consider SRUing the testing of
DEB_BUILD_OPTIONS to stable pkgbinarymanglers/pkg-create-dbgsyms, but
let's first let this bake a while. Until then our debhelper should test
/CurrentlyBuilding too.

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https://bugs.launchpad.net/bugs/1623256

Title:
  adjust the way to create dbgsym packages like Debian does

Status in launchpad-buildd:
  Triaged
Status in debhelper package in Ubuntu:
  In Progress
Status in pkg-create-dbgsym package in Ubuntu:
  New

Bug description:
  Debian now creates dbgsym packages in it's own way, incompatible with
  the Ubuntu approach.  This leads to ftbfs or failed-to-upload packages
  without changing the packaging.  It might be feasible to adjust the
  packaging, however in the long term it would be better to adjust to
  the way to build the dbgsym packages the Debian way.

  example: https://launchpad.net/ubuntu/+source/librevenge/0.0.4-6

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