Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/scripts/Kbuild.include

  1 ####
  2 # kbuild: Generic definitions
  3 
  4 # Convenient variables
  5 comma   := ,
  6 quote   := "
  7 squote  := '
  8 empty   :=
  9 space   := $(empty) $(empty)
 10 space_escape := _-_SPACE_-_
 11 
 12 ###
 13 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
 14 dot-target = $(dir $@).$(notdir $@)
 15 
 16 ###
 17 # The temporary file to save gcc -MD generated dependencies must not
 18 # contain a comma
 19 depfile = $(subst $(comma),_,$(dot-target).d)
 20 
 21 ###
 22 # filename of target with directory and extension stripped
 23 basetarget = $(basename $(notdir $@))
 24 
 25 ###
 26 # filename of first prerequisite with directory and extension stripped
 27 baseprereq = $(basename $(notdir $<))
 28 
 29 ###
 30 # Escape single quote for use in echo statements
 31 escsq = $(subst $(squote),'\$(squote)',$1)
 32 
 33 ###
 34 # Easy method for doing a status message
 35        kecho := :
 36  quiet_kecho := echo
 37 silent_kecho := :
 38 kecho := $($(quiet)kecho)
 39 
 40 ###
 41 # filechk is used to check if the content of a generated file is updated.
 42 # Sample usage:
 43 # define filechk_sample
 44 #       echo $KERNELRELEASE
 45 # endef
 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)
 55 define filechk
 56         $(Q)set -e;                             \
 57         $(kecho) '  CHK     $@';                \
 58         mkdir -p $(dir $@);                     \
 59         $(filechk_$(1)) < $< > $@.tmp;          \
 60         if [ -r $@ ] && cmp -s $@ $@.tmp; then  \
 61                 rm -f $@.tmp;                   \
 62         else                                    \
 63                 $(kecho) '  UPD     $@';        \
 64                 mv -f $@.tmp $@;                \
 65         fi
 66 endef
 67 
 68 ######
 69 # gcc support functions
 70 # See documentation in Documentation/kbuild/makefiles.txt
 71 
 72 # cc-cross-prefix
 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
 76 cc-cross-prefix =  \
 77         $(word 1, $(foreach c,$(1),                                   \
 78                 $(shell set -e;                                       \
 79                 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
 80                         echo $(c);                                    \
 81                 fi)))
 82 
 83 # output directory for tests below
 84 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
 85 
 86 # try-run
 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).$$$$.tmp";       \
 92         TMPO="$(TMPOUT).$$$$.o";        \
 93         if ($(1)) >/dev/null 2>&1;      \
 94         then echo "$(2)";               \
 95         else echo "$(3)";               \
 96         fi;                             \
 97         rm -f "$$TMP" "$$TMPO")
 98 
 99 # as-option
100 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
101 
102 as-option = $(call try-run,\
103         $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
104 
105 # as-instr
106 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
107 
108 as-instr = $(call try-run,\
109         printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
110 
111 # Do not attempt to build with gcc plugins during cc-option tests.
112 # (And this uses delayed resolution so the flags will be up to date.)
113 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
114 
115 # cc-option
116 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
117 
118 cc-option = $(call try-run,\
119         $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
120 
121 # cc-option-yn
122 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
123 cc-option-yn = $(call try-run,\
124         $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
125 
126 # cc-option-align
127 # Prefix align with either -falign or -malign
128 cc-option-align = $(subst -functions=0,,\
129         $(call cc-option,-falign-functions=0,-malign-functions=0))
130 
131 # cc-disable-warning
132 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
133 cc-disable-warning = $(call try-run,\
134         $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
135 
136 # cc-name
137 # Expands to either gcc or clang
138 cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
139 
140 # cc-version
141 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
142 
143 # cc-fullversion
144 cc-fullversion = $(shell $(CONFIG_SHELL) \
145         $(srctree)/scripts/gcc-version.sh -p $(CC))
146 
147 # cc-ifversion
148 # Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
149 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
150 
151 # cc-ldoption
152 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
153 cc-ldoption = $(call try-run,\
154         $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
155 
156 # ld-option
157 # Usage: LDFLAGS += $(call ld-option, -X)
158 ld-option = $(call try-run,\
159         $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
160 
161 # ar-option
162 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
163 # Important: no spaces around options
164 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
165 
166 # ld-version
167 # Note this is mainly for HJ Lu's 3 number binutil versions
168 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
169 
170 # ld-ifversion
171 # Usage:  $(call ld-ifversion, -ge, 22252, y)
172 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
173 
174 ######
175 
176 ###
177 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
178 # Usage:
179 # $(Q)$(MAKE) $(build)=dir
180 build := -f $(srctree)/scripts/Makefile.build obj
181 
182 ###
183 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
184 # Usage:
185 # $(Q)$(MAKE) $(modbuiltin)=dir
186 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
187 
188 ###
189 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
190 # Usage:
191 # $(Q)$(MAKE) $(dtbinst)=dir
192 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
193 
194 ###
195 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
196 # Usage:
197 # $(Q)$(MAKE) $(clean)=dir
198 clean := -f $(srctree)/scripts/Makefile.clean obj
199 
200 ###
201 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
202 # Usage:
203 # $(Q)$(MAKE) $(hdr-inst)=dir
204 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
205 
206 # Prefix -I with $(srctree) if it is not an absolute path.
207 # skip if -I has no parameter
208 addtree = $(if $(patsubst -I%,%,$(1)), \
209 $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
210 
211 # Find all -I options and call addtree
212 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
213 
214 # echo command.
215 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
216 echo-cmd = $(if $($(quiet)cmd_$(1)),\
217         echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
218 
219 # printing commands
220 cmd = @$(echo-cmd) $(cmd_$(1))
221 
222 # Add $(obj)/ for paths that are not absolute
223 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
224 
225 ###
226 # if_changed      - execute command if any prerequisite is newer than
227 #                   target, or command line has changed
228 # if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
229 #                   including used config symbols
230 # if_changed_rule - as if_changed but execute rule instead
231 # See Documentation/kbuild/makefiles.txt for more info
232 
233 ifneq ($(KBUILD_NOCMDDEP),1)
234 # Check if both arguments are the same including their order. Result is empty
235 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
236 arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
237                          $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
238 else
239 arg-check = $(if $(strip $(cmd_$@)),,1)
240 endif
241 
242 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
243 # (needed for make)
244 # Replace >#< with >\#< to avoid starting a comment in the .cmd file
245 # (needed for make)
246 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
247 # (needed for the shell)
248 make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
249 
250 # Find any prerequisites that is newer than target or that does not exist.
251 # PHONY targets skipped in both cases.
252 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
253 
254 # Execute command if command has changed or prerequisite(s) are updated.
255 #
256 if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
257         @set -e;                                                             \
258         $(echo-cmd) $(cmd_$(1));                                             \
259         printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
260 
261 # Execute the command and also postprocess generated .d dependencies file.
262 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ),                  \
263         @set -e;                                                             \
264         $(cmd_and_fixdep), @:)
265 
266 ifndef CONFIG_TRIM_UNUSED_KSYMS
267 
268 cmd_and_fixdep =                                                             \
269         $(echo-cmd) $(cmd_$(1));                                             \
270         scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
271         rm -f $(depfile);                                                    \
272         mv -f $(dot-target).tmp $(dot-target).cmd;
273 
274 else
275 
276 # Filter out exported kernel symbol names from the preprocessor output.
277 # See also __KSYM_DEPS__ in include/linux/export.h.
278 # We disable the depfile generation here, so as not to overwrite the existing
279 # depfile while fixdep is parsing it.
280 flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
281 ksym_dep_filter =                                                            \
282         case "$(1)" in                                                       \
283           cc_*_c|cpp_i_c)                                                    \
284             $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;;        \
285           as_*_S|cpp_s_S)                                                    \
286             $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;;        \
287           boot*|build*|*cpp_lds_S|dtc|host*|vdso*) : ;;                      \
288           *) echo "Don't know how to preprocess $(1)" >&2; false ;;          \
289         esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
290 
291 cmd_and_fixdep =                                                             \
292         $(echo-cmd) $(cmd_$(1));                                             \
293         $(ksym_dep_filter) |                                                 \
294                 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)'          \
295                         > $(dot-target).tmp;                                 \
296         rm -f $(depfile);                                                    \
297         mv -f $(dot-target).tmp $(dot-target).cmd;
298 
299 endif
300 
301 # Usage: $(call if_changed_rule,foo)
302 # Will check if $(cmd_foo) or any of the prerequisites changed,
303 # and if so will execute $(rule_foo).
304 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
305         @set -e;                                                             \
306         $(rule_$(1)), @:)
307 
308 ###
309 # why - tell why a a target got build
310 #       enabled by make V=2
311 #       Output (listed in the order they are checked):
312 #          (1) - due to target is PHONY
313 #          (2) - due to target missing
314 #          (3) - due to: file1.h file2.h
315 #          (4) - due to command line change
316 #          (5) - due to missing .cmd file
317 #          (6) - due to target not in $(targets)
318 # (1) PHONY targets are always build
319 # (2) No target, so we better build it
320 # (3) Prerequisite is newer than target
321 # (4) The command line stored in the file named dir/.target.cmd
322 #     differed from actual command line. This happens when compiler
323 #     options changes
324 # (5) No dir/.target.cmd file (used to store command line)
325 # (6) No dir/.target.cmd file and target not listed in $(targets)
326 #     This is a good hint that there is a bug in the kbuild file
327 ifeq ($(KBUILD_VERBOSE),2)
328 why =                                                                        \
329     $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
330         $(if $(wildcard $@),                                                 \
331             $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
332                 $(if $(arg-check),                                           \
333                     $(if $(cmd_$@),- due to command line change,             \
334                         $(if $(filter $@, $(targets)),                       \
335                             - due to missing .cmd file,                      \
336                             - due to $(notdir $@) not in $$(targets)         \
337                          )                                                   \
338                      )                                                       \
339                  )                                                           \
340              ),                                                              \
341              - due to target missing                                         \
342          )                                                                   \
343      )
344 
345 echo-why = $(call escsq, $(strip $(why)))
346 endif
347 
348 ###############################################################################
349 #
350 # When a Kconfig string contains a filename, it is suitable for
351 # passing to shell commands. It is surrounded by double-quotes, and
352 # any double-quotes or backslashes within it are escaped by
353 # backslashes.
354 #
355 # This is no use for dependencies or $(wildcard). We need to strip the
356 # surrounding quotes and the escaping from quotes and backslashes, and
357 # we *do* need to escape any spaces in the string. So, for example:
358 #
359 # Usage: $(eval $(call config_filename,FOO))
360 #
361 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
362 # transformed as described above to be suitable for use within the
363 # makefile.
364 #
365 # Also, if the filename is a relative filename and exists in the source
366 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
367 # be prefixed to *both* command invocation and dependencies.
368 #
369 # Note: We also print the filenames in the quiet_cmd_foo text, and
370 # perhaps ought to have a version specially escaped for that purpose.
371 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
372 # enough.  It'll strip the quotes in the common case where there's no
373 # space and it's a simple filename, and it'll retain the quotes when
374 # there's a space. There are some esoteric cases in which it'll print
375 # the wrong thing, but we don't really care. The actual dependencies
376 # and commands *do* get it right, with various combinations of single
377 # and double quotes, backslashes and spaces in the filenames.
378 #
379 ###############################################################################
380 #
381 define config_filename
382 ifneq ($$(CONFIG_$(1)),"")
383 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
384 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
385 else
386 ifeq ($$(wildcard $$($(1)_FILENAME)),)
387 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
388 $(1)_SRCPREFIX := $(srctree)/
389 endif
390 endif
391 endif
392 endif
393 endef
394 #
395 ###############################################################################

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