Al wanted to see why Kbuild wanted to build files, to help debug
Makefiles or dependency chains.
Here is a first draft. It always does if_changed_dep $^ processing,
and it has a few whitepace issues, but the paths other than not in
targets passes a basic test.
export KBUILLD_PRINTDEPS=1 and you wil get lines beginning with DEPS:
Signed-off-by: Milton Miller <[email protected]>
--- linux-2.6.17/scripts/Kbuild.include.orig 2006-07-04 16:02:55.000000000 -0400
+++ linux-2.6.17/scripts/Kbuild.include 2006-07-04 17:40:31.000000000 -0400
@@ -112,6 +112,18 @@ ifneq ($(KBUILD_NOCMDDEP),1)
arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) )
endif
+ifeq ($(KBUILD_PRINTDEPS),1)
+deps-cmd = $(if 1,echo 'DEPS: $@ built because' \
+ '$(call escsq,$(if $(wildcard $@), \
+ $(if $(filter $@, $(targets)), \
+ $(if $(call arg-check, $(cmd_$(1)), $(cmd_$@)), \
+ command $(if $(cmd_$@),changed,was missing) \
+ ,of $(sort $(filter-out $(PHONY),$?) \
+ $(filter-out FORCE $(wildcard $^),$^))) \
+ ,it was not a target) \
+ ,it was missing))';)
+endif
+
# echo command. Short version is $(quiet) equals quiet, otherwise full command
echo-cmd = $(if $($(quiet)cmd_$(1)), \
echo ' $(call escsq,$($(quiet)cmd_$(1)))';)
@@ -125,7 +137,7 @@ make-cmd = $(subst \#,\\\#,$(subst $$,$$
if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
@set -e; \
- $(echo-cmd) $(cmd_$(1)); \
+ $(deps-cmd) $(echo-cmd) $(cmd_$(1)); \
echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)
# execute the command and also postprocess generated .d dependencies
@@ -134,7 +146,7 @@ if_changed_dep = $(if $(strip $(filter-o
$(filter-out FORCE $(wildcard $^),$^) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
@set -e; \
- $(echo-cmd) $(cmd_$(1)); \
+ $(deps-cmd) $(echo-cmd) $(cmd_$(1)); \
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
rm -f $(depfile); \
mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd)
@@ -145,4 +157,4 @@ if_changed_dep = $(if $(strip $(filter-o
if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
$(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
@set -e; \
- $(rule_$(1)))
+ $(deps-cmd) $(rule_$(1)))
-
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