Documentation / technical / api-xdiff-interface.txton commit t/: Replace diff [-u|-U0] with test_cmp to allow compilation with old diff (2b14d07)
   1xdiff interface API
   2===================
   3
   4Talk about our calling convention to xdiff library, including
   5xdiff_emit_consume_fn.
   6
   7(Dscho, JC)