2 # kbuild: Generic definitions
9 space := $(empty) $(empty)
10 space_escape := _-_SPACE_-_
14 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
15 dot-target = $(dir $@).$(notdir $@)
18 # The temporary file to save gcc -MD generated dependencies must not
20 depfile = $(subst $(comma),_,$(dot-target).d)
23 # filename of target with directory and extension stripped
24 basetarget = $(basename $(notdir $@))
27 # Escape single quote for use in echo statements
28 escsq = $(subst $(squote),'\$(squote)',$1)
31 # Easy method for doing a status message
35 kecho := $($(quiet)kecho)
38 # filechk is used to check if the content of a generated file is updated.
41 # filechk_sample = echo $(KERNELRELEASE)
43 # $(call filechk,sample)
45 # The rule defined shall write to stdout the content of the new file.
46 # The existing file will be compared with the new one.
47 # - If no file exist it is created
48 # - If the content differ the new file is used
49 # - If they are equal no change, and no timestamp update
50 # - stdin is piped in from the first prerequisite ($<) so one has
51 # to specify a valid file as first prerequisite (often the kbuild file)
55 { $(filechk_$(1)); } > $@.tmp; \
56 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
65 # gcc support functions
66 # See documentation in Documentation/kbuild/makefiles.txt
69 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
70 # Return first prefix where a prefix$(CC) is found in PATH.
71 # If no $(CC) found in PATH with listed prefixes return nothing
73 $(word 1, $(foreach c,$(1), \
75 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
79 # output directory for tests below
80 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
83 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
84 # Exit code chooses option. "$$TMP" serves as a temporary file and is
85 # automatically cleaned up.
86 try-run = $(shell set -e; \
87 TMP="$(TMPOUT).$$$$.tmp"; \
88 TMPO="$(TMPOUT).$$$$.o"; \
89 if ($(1)) >/dev/null 2>&1; \
93 rm -f "$$TMP" "$$TMPO")
96 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
98 as-option = $(call try-run,\
99 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
102 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
104 as-instr = $(call try-run,\
105 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
108 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
109 __cc-option = $(call try-run,\
110 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
112 # Do not attempt to build with gcc plugins during cc-option tests.
113 # (And this uses delayed resolution so the flags will be up to date.)
114 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
117 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
119 cc-option = $(call __cc-option, $(CC),\
120 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
123 # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
124 hostcc-option = $(call __cc-option, $(HOSTCC),\
125 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
128 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
129 cc-option-yn = $(call try-run,\
130 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
133 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
134 cc-disable-warning = $(call try-run,\
135 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
138 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
141 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
142 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
145 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
146 cc-ldoption = $(call try-run,\
147 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
150 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
151 ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
154 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
155 # Important: no spaces around options
156 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
159 # Note this is mainly for HJ Lu's 3 number binutil versions
160 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
163 # Usage: $(call ld-ifversion, -ge, 22252, y)
164 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
169 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
171 # $(Q)$(MAKE) $(build)=dir
172 build := -f $(srctree)/scripts/Makefile.build obj
175 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
177 # $(Q)$(MAKE) $(modbuiltin)=dir
178 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
181 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
183 # $(Q)$(MAKE) $(dtbinst)=dir
184 dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
187 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
189 # $(Q)$(MAKE) $(clean)=dir
190 clean := -f $(srctree)/scripts/Makefile.clean obj
193 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
195 # $(Q)$(MAKE) $(hdr-inst)=dir
196 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
198 # Prefix -I with $(srctree) if it is not an absolute path.
199 # skip if -I has no parameter
200 addtree = $(if $(patsubst -I%,%,$(1)), \
201 $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
203 # Find all -I options and call addtree
204 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
207 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
208 echo-cmd = $(if $($(quiet)cmd_$(1)),\
209 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
212 cmd = @set -e; $(echo-cmd) $(cmd_$(1))
214 # Add $(obj)/ for paths that are not absolute
215 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
218 # if_changed - execute command if any prerequisite is newer than
219 # target, or command line has changed
220 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
221 # including used config symbols
222 # if_changed_rule - as if_changed but execute rule instead
223 # See Documentation/kbuild/makefiles.txt for more info
225 ifneq ($(KBUILD_NOCMDDEP),1)
226 # Check if both arguments are the same including their order. Result is empty
227 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
228 arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
229 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
231 arg-check = $(if $(strip $(cmd_$@)),,1)
234 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
236 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
238 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
239 # (needed for the shell)
240 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
242 # Find any prerequisites that is newer than target or that does not exist.
243 # PHONY targets skipped in both cases.
244 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
246 # Execute command if command has changed or prerequisite(s) are updated.
247 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
249 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
251 # Execute the command and also postprocess generated .d dependencies file.
252 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)
256 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
259 # Usage: $(call if_changed_rule,foo)
260 # Will check if $(cmd_foo) or any of the prerequisites changed,
261 # and if so will execute $(rule_foo).
262 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)
265 # why - tell why a target got built
266 # enabled by make V=2
267 # Output (listed in the order they are checked):
268 # (1) - due to target is PHONY
269 # (2) - due to target missing
270 # (3) - due to: file1.h file2.h
271 # (4) - due to command line change
272 # (5) - due to missing .cmd file
273 # (6) - due to target not in $(targets)
274 # (1) PHONY targets are always build
275 # (2) No target, so we better build it
276 # (3) Prerequisite is newer than target
277 # (4) The command line stored in the file named dir/.target.cmd
278 # differed from actual command line. This happens when compiler
280 # (5) No dir/.target.cmd file (used to store command line)
281 # (6) No dir/.target.cmd file and target not listed in $(targets)
282 # This is a good hint that there is a bug in the kbuild file
283 ifeq ($(KBUILD_VERBOSE),2)
285 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
286 $(if $(wildcard $@), \
287 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
289 $(if $(cmd_$@),- due to command line change, \
290 $(if $(filter $@, $(targets)), \
291 - due to missing .cmd file, \
292 - due to $(notdir $@) not in $$(targets) \
297 - due to target missing \
301 echo-why = $(call escsq, $(strip $(why)))
304 ###############################################################################
306 # When a Kconfig string contains a filename, it is suitable for
307 # passing to shell commands. It is surrounded by double-quotes, and
308 # any double-quotes or backslashes within it are escaped by
311 # This is no use for dependencies or $(wildcard). We need to strip the
312 # surrounding quotes and the escaping from quotes and backslashes, and
313 # we *do* need to escape any spaces in the string. So, for example:
315 # Usage: $(eval $(call config_filename,FOO))
317 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
318 # transformed as described above to be suitable for use within the
321 # Also, if the filename is a relative filename and exists in the source
322 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
323 # be prefixed to *both* command invocation and dependencies.
325 # Note: We also print the filenames in the quiet_cmd_foo text, and
326 # perhaps ought to have a version specially escaped for that purpose.
327 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
328 # enough. It'll strip the quotes in the common case where there's no
329 # space and it's a simple filename, and it'll retain the quotes when
330 # there's a space. There are some esoteric cases in which it'll print
331 # the wrong thing, but we don't really care. The actual dependencies
332 # and commands *do* get it right, with various combinations of single
333 # and double quotes, backslashes and spaces in the filenames.
335 ###############################################################################
337 define config_filename
338 ifneq ($$(CONFIG_$(1)),"")
339 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
340 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
342 ifeq ($$(wildcard $$($(1)_FILENAME)),)
343 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
344 $(1)_SRCPREFIX := $(srctree)/
351 ###############################################################################
353 # delete partially updated (i.e. corrupted) files on error
356 # do not delete intermediate files automatically