[Bug default/19596] Incorrect exit status for incompatible ABI change

["dodji at seketeli dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19596

--- Comment #8 from dodji at seketeli dot org ---
I have indeed reproduced this issue and I think it's a real one.

This particular instance of it seems different from the initial one,
though.

I think the current issue is that libabigail considers a removed
function (or global variable) as being an incompatible change, whether
it has been suppressed or not.

Originally, I designed suppression specifications to act on sub-type
changes only, because these were the ones subject to human
interpretation.  Removed symbols changes were not meant to be suppressed
because I thought they constitute indubitably incompatible changes.

Of course, real world usage made me revisit that point of view :) But
then some parts of the code were not adjusted as they should have been.

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