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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Hmm, OK. Seems the test only fails locally between r2407 and 2408. But
on the wider scale between releases we've maintained compatibility from
0.11/0.12 to dev r2408.

It seems the problem was fixed in r2408 relative to previous releases.
However revisions after 0.12.0 and prior to r2408 had ABI breaks.

And yes, it does indeed seem that we've maintained ABI compatibility by
virtue of having libmircommon.so.3 and libmircommon.so.4 loadable in the
same client process simultaneously. Scary, but seems to work.

** Changed in: mir
       Status: In Progress => Incomplete

** Changed in: mir (Ubuntu)
       Status: New => Incomplete

** Changed in: mir
    Milestone: 0.13.0 => None

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https://bugs.launchpad.net/bugs/1434400

Title:
  [regression] Client ABI 8 broken in 0.13 series

Status in Mir:
  Incomplete
Status in mir package in Ubuntu:
  Incomplete

Bug description:
  I've just done a little sanity testing of our client ABI changes and
  found we've broken the client 8 ABI at least once, maybe twice in
  series 0.13.

  Test case: Drop older demos client binaries (which still only use
  libmirclient8) into a newer build tree.

  Expected: demo clients still run.
  Observed: demo clients fail to start with:
  bin/.mir_demo_client_fingerpaint-uninstalled: relocation error: bin/.mir_demo_client_fingerpaint-uninstalled: symbol mir_surface_get_buffer_stream, version MIR_CLIENT_8 not defined in file libmirclient.so.8 with link time reference

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