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Older Wayland binaries fail at start (regression)

Starting of older Wayland binaries begun failing between following Weston commits:

  • 2021-07-22 63fc73d1: gl-renderer: Assume num images the same as the no of planes
  • 2021-07-23 b46d0e33: tests/roles: switch to xdg-shell

All (=many) older Wayland binaries I have, which were compiled on Ubuntu 16.04 or 18.04, do not work any more. Either they abort at start complaining about missing shell/compositor, or crash to NULL pointer error (due to missing error checks I guess).

This happens both using master & main branch versions of libwayland & wayland-protocols, or their older versions in Ubuntu 20.04.

Other notes:

  • X versions of those old binaries run fine on top of latest Weston + Xwayland
  • "glmark2-wayland" in Ubuntu 20.04 works fine with latest Weston

=> issue is Wayland API backwards compatibility regression.

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