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[Launchpad Bug Tracker <1423591@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/vivid-proposed/mir

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https://bugs.launchpad.net/bugs/1423591

Title:
  [regression] Platform libraries and packages are not versioned

Status in Mir:
  Fix Committed
Status in mir package in Ubuntu:
  Triaged

Bug description:
  Our graphics/client platform libraries and packages are not versioned
  and thus are not installable in parallel.

  Since our other libraries are installable in parallel, this can lead
  to problems like the one seen in [1]:

  1. Start with a system that has Mir 0.11 (mirserver19, mirplatform6, MIR_GRAPHICS_PLATFORM_1).
  2. Bump mirserver ABI 20 in *trunk*, build and install packages (mirserver20, mirplatform7, MIR_GRAPHICS_PLATFORM_2).
  3. Applications that use mirserver19 (e.g. USC) will load the new graphics platform modules, try to load a symbol with version 
  MIR_GRAPHICS_PLATFORM_1 (which is what mirserver19 works with) and fail.

  Note that this doesn't happen if we don't bump the mirserver ABI,
  because in that case when installing the new package we replace the
  system mirserver19 with a version that looks for
  MIR_GRAPHICS_PLATFORM_2, which is the correct version for the new
  graphics platform binaries.

  [1] https://code.launchpad.net/~alan-griffiths/mir/test-ABI-bump-
  libmirserver/+merge/250177

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