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 # real prerequisites without phony targets
28 real-prereqs = $(filter-out $(PHONY), $^)
31 # Escape single quote for use in echo statements
32 escsq = $(subst $(squote),'\$(squote)',$1)
35 # Easy method for doing a status message
39 kecho := $($(quiet)kecho)
42 # filechk is used to check if the content of a generated file is updated.
45 # filechk_sample = echo $(KERNELRELEASE)
47 # $(call filechk,sample)
49 # The rule defined shall write to stdout the content of the new file.
50 # The existing file will be compared with the new one.
51 # - If no file exist it is created
52 # - If the content differ the new file is used
53 # - If they are equal no change, and no timestamp update
54 # - stdin is piped in from the first prerequisite ($<) so one has
55 # 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>gcc is found in PATH.
75 # If no gcc found in PATH with listed prefixes return nothing
76 cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \
77 $(if $(shell which $(c)gcc), $(c))))
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 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
139 cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
142 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
143 ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
146 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
147 # Important: no spaces around options
148 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
151 # Note this is mainly for HJ Lu's 3 number binutil versions
152 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
155 # Usage: $(call ld-ifversion, -ge, 22252, y)
156 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
161 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
163 # $(Q)$(MAKE) $(build)=dir
164 build := -f $(srctree)/scripts/Makefile.build obj
167 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
169 # $(Q)$(MAKE) $(modbuiltin)=dir
170 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
173 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
175 # $(Q)$(MAKE) $(dtbinst)=dir
176 dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
179 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
181 # $(Q)$(MAKE) $(clean)=dir
182 clean := -f $(srctree)/scripts/Makefile.clean obj
185 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
187 # $(Q)$(MAKE) $(hdr-inst)=dir
188 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
191 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
192 echo-cmd = $(if $($(quiet)cmd_$(1)),\
193 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
196 cmd = @set -e; $(echo-cmd) $(cmd_$(1))
198 # Add $(obj)/ for paths that are not absolute
199 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
202 # if_changed - execute command if any prerequisite is newer than
203 # target, or command line has changed
204 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
205 # including used config symbols
206 # if_changed_rule - as if_changed but execute rule instead
207 # See Documentation/kbuild/makefiles.txt for more info
209 ifneq ($(KBUILD_NOCMDDEP),1)
210 # Check if both arguments are the same including their order. Result is empty
211 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
212 arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
213 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
215 arg-check = $(if $(strip $(cmd_$@)),,1)
218 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
220 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
222 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
223 # (needed for the shell)
224 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
226 # Find any prerequisites that is newer than target or that does not exist.
227 # PHONY targets skipped in both cases.
228 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
230 # Execute command if command has changed or prerequisite(s) are updated.
231 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
233 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
235 # Execute the command and also postprocess generated .d dependencies file.
236 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)
240 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
243 # Usage: $(call if_changed_rule,foo)
244 # Will check if $(cmd_foo) or any of the prerequisites changed,
245 # and if so will execute $(rule_foo).
246 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)
249 # why - tell why a target got built
250 # enabled by make V=2
251 # Output (listed in the order they are checked):
252 # (1) - due to target is PHONY
253 # (2) - due to target missing
254 # (3) - due to: file1.h file2.h
255 # (4) - due to command line change
256 # (5) - due to missing .cmd file
257 # (6) - due to target not in $(targets)
258 # (1) PHONY targets are always build
259 # (2) No target, so we better build it
260 # (3) Prerequisite is newer than target
261 # (4) The command line stored in the file named dir/.target.cmd
262 # differed from actual command line. This happens when compiler
264 # (5) No dir/.target.cmd file (used to store command line)
265 # (6) No dir/.target.cmd file and target not listed in $(targets)
266 # This is a good hint that there is a bug in the kbuild file
267 ifeq ($(KBUILD_VERBOSE),2)
269 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
270 $(if $(wildcard $@), \
271 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
273 $(if $(cmd_$@),- due to command line change, \
274 $(if $(filter $@, $(targets)), \
275 - due to missing .cmd file, \
276 - due to $(notdir $@) not in $$(targets) \
281 - due to target missing \
285 echo-why = $(call escsq, $(strip $(why)))
288 ###############################################################################
290 # When a Kconfig string contains a filename, it is suitable for
291 # passing to shell commands. It is surrounded by double-quotes, and
292 # any double-quotes or backslashes within it are escaped by
295 # This is no use for dependencies or $(wildcard). We need to strip the
296 # surrounding quotes and the escaping from quotes and backslashes, and
297 # we *do* need to escape any spaces in the string. So, for example:
299 # Usage: $(eval $(call config_filename,FOO))
301 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
302 # transformed as described above to be suitable for use within the
305 # Also, if the filename is a relative filename and exists in the source
306 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
307 # be prefixed to *both* command invocation and dependencies.
309 # Note: We also print the filenames in the quiet_cmd_foo text, and
310 # perhaps ought to have a version specially escaped for that purpose.
311 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
312 # enough. It'll strip the quotes in the common case where there's no
313 # space and it's a simple filename, and it'll retain the quotes when
314 # there's a space. There are some esoteric cases in which it'll print
315 # the wrong thing, but we don't really care. The actual dependencies
316 # and commands *do* get it right, with various combinations of single
317 # and double quotes, backslashes and spaces in the filenames.
319 ###############################################################################
321 define config_filename
322 ifneq ($$(CONFIG_$(1)),"")
323 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
324 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
326 ifeq ($$(wildcard $$($(1)_FILENAME)),)
327 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
328 $(1)_SRCPREFIX := $(srctree)/
335 ###############################################################################
337 # delete partially updated (i.e. corrupted) files on error
340 # do not delete intermediate files automatically