Commit 6796e804 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: macrofy the condition of if_changed and friends 



Add a new macro that expands into $(newer-prereqs)$(cmd-check).

It makes it easier to add common code for if_changed, if_changed_dep,
and if_changed_rule.

Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
parent 55a6d00e

scripts/Kbuild.include

+5 −3
Original line number Diff line number Diff line
@@ -130,13 +130,15 @@ make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))) 
# PHONY targets skipped in both cases.

newer-prereqs = $(filter-out $(PHONY),$?)



if-changed-cond = $(newer-prereqs)$(cmd-check)



# Execute command if command has changed or prerequisite(s) are updated.

if_changed = $(if $(newer-prereqs)$(cmd-check),                              \

if_changed = $(if $(if-changed-cond),                                        \

	$(cmd);                                                              \

	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)



# Execute the command and also postprocess generated .d dependencies file.

if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:)

if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)



cmd_and_fixdep =                                                             \

	$(cmd);                                                              \
@@ -146,7 +148,7 @@ cmd_and_fixdep = \ 
# Usage: $(call if_changed_rule,foo)

# Will check if $(cmd_foo) or any of the prerequisites changed,

# and if so will execute $(rule_foo).

if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:)

if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:)



###

# why - tell why a target got built