[Bug default/20476] abidiff doesn't report incompatibility for abstract class when implementation has hidden visibility

["james at jamesh dot id.au" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20476

--- Comment #1 from James Henstridge <james at jamesh dot id.au> ---
Created attachment 9441
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9441&action=edit
Makefile

To test:

  $ make
  $ abidiff libtest-hidden-old.so libtest-hidden-new.so
  $ abidiff libtest-default-old.so libtest-default-new.so

I would expect both abidiff invocations to display the compatibility problem,
however the diff of the -fvisibility=hidden libraries shows no changes and has
an exit status of 0.

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