# - If they are equal no change, and no timestamp update
# - stdin is piped in from the first prerequisite ($<) so one has
# to specify a valid file as first prerequisite (often the kbuild file)
+ chk_filechk = :
quiet_chk_filechk = echo ' CHK $@'
silent_chk_filechk = :
+ upd_filechk = :
quiet_upd_filechk = echo ' UPD $@'
silent_upd_filechk = :
+
define filechk
$(Q)set -e; \
$($(quiet)chk_filechk); \