abidiff --suppressions /no_such_file dump1 dump2 This completes without error, even though the suppressions file does not exist.
This issue should be fixed in the master branch by commit https://sourceware.org/git/gitweb.cgi?p=libabigail.git;a=commit;h=2c4efc0c3e47f28d0f19e6c7f18268fc933917ba Thank you for reporting this problem!
Closing this, as it should be fixed.