The check was backwards so we were not correctly detecting removals.
@$(UPDATE_FILE) $(srcdir)/Doc/data/python$(LDVERSION).abi $(srcdir)/Doc/data/python$(LDVERSION).abi.new
check-abidump: all
- abidiff "libpython$(LDVERSION).so" $(srcdir)/Doc/data/python$(LDVERSION).abi --drop-private-types --no-architecture --no-added-syms
+ abidiff $(srcdir)/Doc/data/python$(LDVERSION).abi "libpython$(LDVERSION).so" --drop-private-types --no-architecture --no-added-syms
############################################################################
# Regenerate all generated files