2 # kbuild: Generic definitions
9 space := $(empty) $(empty)
13 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
14 dot-target = $(dir $@).$(notdir $@)
17 # The temporary file to save gcc -MD generated dependencies must not
19 depfile = $(subst $(comma),_,$(dot-target).d)
22 # filename of target with directory and extension stripped
23 basetarget = $(basename $(notdir $@))
26 # filename of first prerequisite with directory and extension stripped
27 baseprereq = $(basename $(notdir $<))
30 # Escape single quote for use in echo statements
31 escsq = $(subst $(squote),'\$(squote)',$1)
34 # Easy method for doing a status message
38 kecho := $($(quiet)kecho)
41 # filechk is used to check if the content of a generated file is updated.
43 # define filechk_sample
46 # version.h : Makefile
47 # $(call filechk,sample)
48 # The rule defined shall write to stdout the content of the new file.
49 # The existing file will be compared with the new one.
50 # - If no file exist it is created
51 # - If the content differ the new file is used
52 # - If they are equal no change, and no timestamp update
53 # - stdin is piped in from the first prerequisite ($<) so one has
54 # to specify a valid file as first prerequisite (often the kbuild file)
59 $(filechk_$(1)) < $< > $@.tmp; \
60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
69 # gcc support functions
70 # See documentation in Documentation/kbuild/makefiles.txt
73 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
74 # Return first prefix where a prefix$(CC) is found in PATH.
75 # If no $(CC) found in PATH with listed prefixes return nothing
77 $(word 1, $(foreach c,$(1), \
79 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
83 # output directory for tests below
84 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
87 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
88 # Exit code chooses option. "$$TMP" is can be used as temporary file and
89 # is automatically cleaned up.
90 try-run = $(shell set -e; \
91 TMP="$(TMPOUT).$$$$.tmp"; \
92 TMPO="$(TMPOUT).$$$$.o"; \
93 if ($(1)) >/dev/null 2>&1; \
97 rm -f "$$TMP" "$$TMPO")
100 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
102 as-option = $(call try-run,\
103 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
106 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
108 as-instr = $(call try-run,\
109 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
112 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
113 __cc-option = $(call try-run,\
114 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
116 # Do not attempt to build with gcc plugins during cc-option tests.
117 # (And this uses delayed resolution so the flags will be up to date.)
118 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
121 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
123 cc-option = $(call __cc-option, $(CC),\
124 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
127 # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
128 hostcc-option = $(call __cc-option, $(HOSTCC),\
129 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
132 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
133 cc-option-yn = $(call try-run,\
134 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
137 # Prefix align with either -falign or -malign
138 cc-option-align = $(subst -functions=0,,\
139 $(call cc-option,-falign-functions=0,-malign-functions=0))
142 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
143 cc-disable-warning = $(call try-run,\
144 $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
147 # Expands to either gcc or clang
148 cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
151 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
154 cc-fullversion = $(shell $(CONFIG_SHELL) \
155 $(srctree)/scripts/gcc-version.sh -p $(CC))
158 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
159 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
162 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
163 cc-ldoption = $(call try-run,\
164 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
167 # Usage: LDFLAGS += $(call ld-option, -X)
168 ld-option = $(call try-run,\
169 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
172 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
173 # Important: no spaces around options
174 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
177 # Note this is mainly for HJ Lu's 3 number binutil versions
178 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
181 # Usage: $(call ld-ifversion, -ge, 22252, y)
182 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
187 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
189 # $(Q)$(MAKE) $(build)=dir
190 build := -f $(srctree)/scripts/Makefile.build obj
193 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
195 # $(Q)$(MAKE) $(modbuiltin)=dir
196 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
199 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
201 # $(Q)$(MAKE) $(dtbinst)=dir
202 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
205 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
207 # $(Q)$(MAKE) $(clean)=dir
208 clean := -f $(srctree)/scripts/Makefile.clean obj
211 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
213 # $(Q)$(MAKE) $(hdr-inst)=dir
214 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
216 # Prefix -I with $(srctree) if it is not an absolute path.
217 # skip if -I has no parameter
218 addtree = $(if $(patsubst -I%,%,$(1)), \
219 $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
221 # Find all -I options and call addtree
222 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
225 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
226 echo-cmd = $(if $($(quiet)cmd_$(1)),\
227 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
230 cmd = @$(echo-cmd) $(cmd_$(1))
232 # Add $(obj)/ for paths that are not absolute
233 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
236 # if_changed - execute command if any prerequisite is newer than
237 # target, or command line has changed
238 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
239 # including used config symbols
240 # if_changed_rule - as if_changed but execute rule instead
241 # See Documentation/kbuild/makefiles.txt for more info
243 ifneq ($(KBUILD_NOCMDDEP),1)
244 # Check if both arguments has same arguments. Result is empty string if equal.
245 # User may override this check using make KBUILD_NOCMDDEP=1
246 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
247 $(filter-out $(cmd_$@), $(cmd_$(1))) )
249 arg-check = $(if $(strip $(cmd_$@)),,1)
252 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
254 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
256 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
257 # (needed for the shell)
258 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
260 # Find any prerequisites that is newer than target or that does not exist.
261 # PHONY targets skipped in both cases.
262 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
264 # Execute command if command has changed or prerequisite(s) are updated.
266 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
268 $(echo-cmd) $(cmd_$(1)); \
269 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
271 # Execute the command and also postprocess generated .d dependencies file.
272 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
274 $(echo-cmd) $(cmd_$(1)); \
275 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
277 mv -f $(dot-target).tmp $(dot-target).cmd)
279 # Usage: $(call if_changed_rule,foo)
280 # Will check if $(cmd_foo) or any of the prerequisites changed,
281 # and if so will execute $(rule_foo).
282 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
287 # why - tell why a a target got build
288 # enabled by make V=2
289 # Output (listed in the order they are checked):
290 # (1) - due to target is PHONY
291 # (2) - due to target missing
292 # (3) - due to: file1.h file2.h
293 # (4) - due to command line change
294 # (5) - due to missing .cmd file
295 # (6) - due to target not in $(targets)
296 # (1) PHONY targets are always build
297 # (2) No target, so we better build it
298 # (3) Prerequisite is newer than target
299 # (4) The command line stored in the file named dir/.target.cmd
300 # differed from actual command line. This happens when compiler
302 # (5) No dir/.target.cmd file (used to store command line)
303 # (6) No dir/.target.cmd file and target not listed in $(targets)
304 # This is a good hint that there is a bug in the kbuild file
305 ifeq ($(KBUILD_VERBOSE),2)
307 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
308 $(if $(wildcard $@), \
309 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
311 $(if $(cmd_$@),- due to command line change, \
312 $(if $(filter $@, $(targets)), \
313 - due to missing .cmd file, \
314 - due to $(notdir $@) not in $$(targets) \
319 - due to target missing \
323 echo-why = $(call escsq, $(strip $(why)))
326 ###############################################################################
328 # When a Kconfig string contains a filename, it is suitable for
329 # passing to shell commands. It is surrounded by double-quotes, and
330 # any double-quotes or backslashes within it are escaped by
333 # This is no use for dependencies or $(wildcard). We need to strip the
334 # surrounding quotes and the escaping from quotes and backslashes, and
335 # we *do* need to escape any spaces in the string. So, for example:
337 # Usage: $(eval $(call config_filename,FOO))
339 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
340 # transformed as described above to be suitable for use within the
343 # Also, if the filename is a relative filename and exists in the source
344 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
345 # be prefixed to *both* command invocation and dependencies.
347 # Note: We also print the filenames in the quiet_cmd_foo text, and
348 # perhaps ought to have a version specially escaped for that purpose.
349 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
350 # enough. It'll strip the quotes in the common case where there's no
351 # space and it's a simple filename, and it'll retain the quotes when
352 # there's a space. There are some esoteric cases in which it'll print
353 # the wrong thing, but we don't really care. The actual dependencies
354 # and commands *do* get it right, with various combinations of single
355 # and double quotes, backslashes and spaces in the filenames.
357 ###############################################################################
359 space_escape := %%%SPACE%%%
361 define config_filename
362 ifneq ($$(CONFIG_$(1)),"")
363 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
364 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
366 ifeq ($$(wildcard $$($(1)_FILENAME)),)
367 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
368 $(1)_SRCPREFIX := $(srctree)/
375 ###############################################################################