[Bug 1101977] Re: Fix wrong-arch issues in crossbuild of libnih

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https://bugs.launchpad.net/bugs/1101977

Title:
  Fix wrong-arch issues in crossbuild of libnih

Status in “libnih” package in Ubuntu:
  New

Bug description:
  libnih1.0.3-4ubuntu15 gained cross-build support which is great, but
  it has a couple of things wrong.

  The first is simple and trivial to fix. A BUILD/HOST typo in
  configure. Which causes it to fail to find dbus-1, because it used the
  build-arch pkgconfig. This probably wasn't previously noticed due to
  the work-around decribed of installing both build-arch and host-arch
  build-deps.

  The second is trickier. It tries to run tests using nih-dbus-tool,
  even is DEB_BUILD_OPTIONS=nocheck is set. These fail because nih-dbus-
  tool is the wrong arch. Oddly the rules file contains
  NIH_DBUS_TOOL=$(CURDIR)/build-dbus-tool/nih-dbus-tool/nih-dbus-tool,
  when cross-building, to carefully set this to use the version which
  has been built. This will of course not run unless qemu is available
  for the host arch (it isn't for arm64). It maybe that the above plus
  the dh_auto_configure -B build-dbus-tool/ --host=$(DEB_BUILD_GNU_TYPE)
  was intended to build this too for the build arch, but then the wrong-
  arch nih-dbus-tool file ends up in the nih-dbus-tool package, does it
  not? It would need to be built twice, once for each arch for this to
  work.

  Ideally DEB_BUILD_OPTIONS=nocheck would simply stop these targets
  being run, and 'make all-am' instead of 'make all' seems to do this. I
  suspect that the tests aren't being run in fact, just built, but that
  fails because it uses this tool - not sure. I failed to discern
  exactly what the right rune for 'don't try to build/run the tests' is
  in dh_foo-speak, so instead elected to set NIH_DBUS_TOOL to use the
  build-arch tool. This works fine. Enforcing this build-dep needs a
  :native so can't be done for the time being, but I see the package
  already has some of those pending.

  Finding the right rune to make DEB_BUILD_OPTIONS=nocheck skip this
  might be a better fix.

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