linux/scripts/Kbuild.include

1 # SPDX-License-Identifier: GPL-2.0
11 space_escape := _-_SPACE_-_
20 # Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000)
25 test-ge = $(intcmp $(strip $1)0, $(strip $2)0,,y,y)
26 test-gt = $(intcmp $(strip $1)0, $(strip $2)0,,,y)
28 test-ge = $(shell test $(strip $1)0 -ge $(strip $2)0 && echo y)
29 test-gt = $(shell test $(strip $1)0 -gt $(strip $2)0 && echo y)
31 test-le = $(call test-ge, $2, $1)
32 test-lt = $(call test-gt, $2, $1)
36 dot-target = $(dir $@).$(notdir $@)
40 tmp-target = $(dir $@).tmp_$(notdir $@)
43 # The temporary file to save gcc -MMD generated dependencies must not
45 depfile = $(subst $(comma),_,$(dot-target).d)
53 real-prereqs = $(filter-out $(PHONY), $^)
65 kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
66 kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
72 ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),)
73 read-file = $(subst $(newline),$(space),$(file < $1))
75 read-file = $(shell cat $1 2>/dev/null)
95 # - If no file exist it is created
96 # - If the content differ the new file is used
97 # - If they are equal no change, and no timestamp update
99 	$(check-FORCE)
100 	$(Q)set -e;						\
101 	mkdir -p $(dir $@);					\
102 	trap "rm -f $(tmp-target)" EXIT;			\
103 	{ $(filechk_$(1)); } > $(tmp-target);			\
104 	if [ ! -r $@ ] || ! cmp -s $@ $(tmp-target); then	\
106 		mv -f $(tmp-target) $@;				\
111 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
113 # $(Q)$(MAKE) $(build)=dir
114 build := -f $(srctree)/scripts/Makefile.build obj
117 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
119 # $(Q)$(MAKE) $(dtbinst)=dir
120 dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
123 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
125 # $(Q)$(MAKE) $(clean)=dir
126 clean := -f $(srctree)/scripts/Makefile.clean obj
141 # the interrupted recipe. So, you can safely stop the build by Ctrl-C (Make
154 delete-on-interrupt = \
155 	$(if $(filter-out $(PHONY), $@), \
156 		$(foreach sig, HUP INT QUIT TERM PIPE, \
157 			trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);))
160 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_print) $(delete-on-interrupt) $(cmd_$(1)),:)
163 # if_changed      - execute command if any prerequisite is newer than
165 # if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
167 # if_changed_rule - as if_changed but execute rule instead
173 # If the target does not exist, the *.cmd file should not be included so
174 # $(savedcmd_$@) gets empty. Then, target will be built even if $(newer-prereqs)
176 cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(savedcmd_$@))), \
180 cmd-check = $(if $(strip $(savedcmd_$@)),,1)
183 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
185 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
189 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
193 # If there is no prerequisite other than phony targets, $(newer-prereqs) becomes
194 # empty even if the target does not exist. cmd-check saves this corner case.
195 newer-prereqs = $(filter-out $(PHONY),$?)
199 check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing))
201 if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE)
204 if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:)
207 	$(cmd);                                                              \
208 	printf '%s\n' 'savedcmd_$@ := $(make-cmd)' > $(dot-target).cmd
211 if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)
214 	$(cmd);                                                              \
215 	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
216 	rm -f $(depfile)
221 if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:)
224 # why - tell why a target got built
227 #          (1) - due to target is PHONY
228 #          (2) - due to target missing
229 #          (3) - due to: file1.h file2.h
230 #          (4) - due to command line change
231 #          (5) - due to missing .cmd file
232 #          (6) - due to target not in $(targets)
236 # (4) The command line stored in the file named dir/.target.cmd
239 # (5) No dir/.target.cmd file (used to store command line)
240 # (6) No dir/.target.cmd file and target not listed in $(targets)
244     $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
246             $(if $(newer-prereqs),- due to: $(newer-prereqs),                \
247                 $(if $(cmd-check),                                           \
248                     $(if $(savedcmd_$@),- due to command line change,        \
250                             - due to missing .cmd file,                      \
251                             - due to $(notdir $@) not in $$(targets)         \
256              - due to target missing                                         \
273 # Use .SECONDARY for older Make versions, but "newer-prereq" cannot detect
275 ifneq ($(and $(filter notintermediate, $(.FEATURES)),$(filter-out 4.4,$(MAKE_VERSION))),)