[PATCH v4 13/14] kbuild: add cmd_and_savecmd macro

Masahiro Yamada
2022-05-08T19:19:48Z

Separate out the command execution part of if_changed, as we did
for if_changed_dep.

This allows us to reuse it in if_changed_rule.

define rule_foo
$(call cmd_and_savecmd,foo)
$(call cmd,bar)
endef

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
---

Changes in v4:
- New.
Resent of my previous submission.
https://lore.kernel.org/all/20210831074004.3195284-10-masahiroy@kernel.org/

scripts/Kbuild.include | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 455a0a6ce12d..ece44b735061 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -142,9 +142,11 @@ check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing)
if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE)

# Execute command if command has changed or prerequisite(s) are updated.
-if_changed = $(if $(if-changed-cond), \
+if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:)
+
+cmd_and_savecmd = \
$(cmd); \
- printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
+ printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd

# Execute the command and also postprocess generated .d dependencies file.
if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)
--
2.32.0