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1####
2# kbuild: Generic definitions
3
beda9f3a 4# Convenient variables
8ec4b4ff 5comma := ,
13338935 6quote := "
d51bfb78 7squote := '
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8empty :=
9space := $(empty) $(empty)
9c8fa9bc 10space_escape := _-_SPACE_-_
322d8e79 11pound := \#
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12right_paren := )
13left_paren := (
8ec4b4ff 14
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15###
16# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
17dot-target = $(dir $@).$(notdir $@)
18
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19###
20# The temporary file to save gcc -MD generated dependencies must not
21# contain a comma
48f1f058 22depfile = $(subst $(comma),_,$(dot-target).d)
8ec4b4ff 23
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24###
25# filename of target with directory and extension stripped
26basetarget = $(basename $(notdir $@))
27
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28###
29# filename of first prerequisite with directory and extension stripped
30baseprereq = $(basename $(notdir $<))
31
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32###
33# Escape single quote for use in echo statements
34escsq = $(subst $(squote),'\$(squote)',$1)
35
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36###
37# Easy method for doing a status message
38 kecho := :
39 quiet_kecho := echo
40silent_kecho := :
41kecho := $($(quiet)kecho)
42
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43###
44# filechk is used to check if the content of a generated file is updated.
45# Sample usage:
46# define filechk_sample
47# echo $KERNELRELEASE
48# endef
49# version.h : Makefile
50# $(call filechk,sample)
51# The rule defined shall write to stdout the content of the new file.
52# The existing file will be compared with the new one.
53# - If no file exist it is created
54# - If the content differ the new file is used
55# - If they are equal no change, and no timestamp update
56# - stdin is piped in from the first prerequisite ($<) so one has
57# to specify a valid file as first prerequisite (often the kbuild file)
58define filechk
59 $(Q)set -e; \
fd54f502 60 $(kecho) ' CHK $@'; \
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61 mkdir -p $(dir $@); \
62 $(filechk_$(1)) < $< > $@.tmp; \
63 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
64 rm -f $@.tmp; \
65 else \
fd54f502 66 $(kecho) ' UPD $@'; \
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67 mv -f $@.tmp $@; \
68 fi
69endef
70
20a468b5 71######
9d6e7a70 72# gcc support functions
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73# See documentation in Documentation/kbuild/makefiles.txt
74
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75# cc-cross-prefix
76# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
77# Return first prefix where a prefix$(CC) is found in PATH.
78# If no $(CC) found in PATH with listed prefixes return nothing
79cc-cross-prefix = \
80 $(word 1, $(foreach c,$(1), \
81 $(shell set -e; \
82 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
83 echo $(c); \
84 fi)))
85
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86# Tools for caching Makefile variables that are "expensive" to compute.
87#
88# Here we want to help deal with variables that take a long time to compute
89# by making it easy to store these variables in a cache.
90#
91# The canonical example here is testing for compiler flags. On a simple system
92# each call to the compiler takes 10 ms, but on a system with a compiler that's
93# called through various wrappers it can take upwards of 100 ms. If we have
94# 100 calls to the compiler this can take 1 second (on a simple system) or 10
95# seconds (on a complicated system).
96#
97# The "cache" will be in Makefile syntax and can be directly included.
98# Any time we try to reference a variable that's not in the cache we'll
99# calculate it and store it in the cache for next time.
100
101# Include values from last time
102make-cache := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/,$(if $(obj),$(obj)/)).cache.mk
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103$(make-cache): ;
104-include $(make-cache)
105
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106cached-data := $(filter __cached_%, $(.VARIABLES))
107
e17c400a 108# If cache exceeds 1000 lines, shrink it down to 500.
9a234a2e 109ifneq ($(word 1000,$(cached-data)),)
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110$(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
111 mv $(make-cache).tmp $(make-cache))
112endif
113
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114create-cache-dir := $(if $(KBUILD_SRC),$(if $(cache-data),,1))
115
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116# Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
117#
118# Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
119__sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
120
121# Usage: $(call shell-cached,shell_command)
122# Example: $(call shell-cached,md5sum /usr/bin/gcc)
123#
124# If we've already seen a call to this exact shell command (even in a
125# previous invocation of make!) we'll return the value. If not, we'll
126# compute it and store the result for future runs.
127#
128# This is a bit of voodoo, but basic explanation is that if the variable
129# was undefined then we'll evaluate the shell command and store the result
130# into the variable. We'll then store that value in the cache and finally
131# output the value.
132#
133# NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
134# happen to know that the caller will have their shell command in $(2) so the
135# result of "call"ing this will produce a reference to that $(2). The reason
136# for this strangeness is to avoid an extra level of eval (and escaping) of
137# $(2).
138define __run-and-store
139ifeq ($(origin $(1)),undefined)
140 $$(eval $(1) := $$(shell $$(2)))
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141ifeq ($(create-cache-dir),1)
142 $$(shell mkdir -p $(dir $(make-cache)))
143 $$(eval create-cache-dir :=)
144endif
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145 $$(shell echo '$(1) := $$($(1))' >> $(make-cache))
146endif
147endef
148__shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
149shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
150
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151# output directory for tests below
152TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
153
154# try-run
155# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
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156# Exit code chooses option. "$$TMP" serves as a temporary file and is
157# automatically cleaned up.
3298b690 158__try-run = set -e; \
beda9f3a 159 TMP="$(TMPOUT).$$$$.tmp"; \
691ef3e7 160 TMPO="$(TMPOUT).$$$$.o"; \
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161 if ($(1)) >/dev/null 2>&1; \
162 then echo "$(2)"; \
163 else echo "$(3)"; \
164 fi; \
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165 rm -f "$$TMP" "$$TMPO"
166
167try-run = $(shell $(__try-run))
168
169# try-run-cached
170# This works like try-run, but the result is cached.
171try-run-cached = $(call shell-cached,$(__try-run))
347a00fb 172
20a468b5 173# as-option
bff288c1 174# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
beda9f3a 175
3298b690 176as-option = $(call try-run-cached,\
b1e0d8b7 177 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
20a468b5 178
e2414910 179# as-instr
bff288c1 180# Usage: cflags-y += $(call as-instr,instr,option1,option2)
beda9f3a 181
3298b690 182as-instr = $(call try-run-cached,\
b1e0d8b7 183 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
e2414910 184
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185# __cc-option
186# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
3298b690 187__cc-option = $(call try-run-cached,\
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188 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
189
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190# Do not attempt to build with gcc plugins during cc-option tests.
191# (And this uses delayed resolution so the flags will be up to date.)
192CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
193
20a468b5 194# cc-option
bff288c1 195# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
beda9f3a 196
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197cc-option = $(call __cc-option, $(CC),\
198 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
199
200# hostcc-option
201# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
202hostcc-option = $(call __cc-option, $(HOSTCC),\
203 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
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204
205# cc-option-yn
bff288c1 206# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
3298b690 207cc-option-yn = $(call try-run-cached,\
c3f0d0bc 208 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
20a468b5 209
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210# cc-disable-warning
211# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
3298b690 212cc-disable-warning = $(call try-run-cached,\
c3f0d0bc 213 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
8417da6f 214
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215# cc-name
216# Expands to either gcc or clang
3298b690 217cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
5631d9c4 218
20a468b5 219# cc-version
3298b690 220cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
20a468b5 221
0ab2a272 222# cc-fullversion
3298b690 223cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
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224 $(srctree)/scripts/gcc-version.sh -p $(CC))
225
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226# cc-ifversion
227# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
6dcb4e5e 228cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
20a468b5 229
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230# cc-if-fullversion
231# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
232cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
233
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234# cc-ldoption
235# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
3298b690 236cc-ldoption = $(call try-run-cached,\
86a9df59 237 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
5de043f4 238
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239# ld-option
240# Usage: LDFLAGS += $(call ld-option, -X)
3298b690 241ld-option = $(call try-run-cached,\
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242 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
243 $(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
691ef3e7 244
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245# ar-option
246# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
247# Important: no spaces around options
3298b690 248ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
40df759e 249
ccbef167 250# ld-version
ccbef167 251# Note this is mainly for HJ Lu's 3 number binutil versions
3298b690 252ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
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253
254# ld-ifversion
255# Usage: $(call ld-ifversion, -ge, 22252, y)
6dcb4e5e 256ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
ccbef167 257
5de043f4 258######
0b0bf7a3 259
beda9f3a 260###
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261# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
262# Usage:
263# $(Q)$(MAKE) $(build)=dir
5b2389b4 264build := -f $(srctree)/scripts/Makefile.build obj
8ec4b4ff 265
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266###
267# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
268# Usage:
269# $(Q)$(MAKE) $(modbuiltin)=dir
5b2389b4 270modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
bc081dd6 271
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272###
273# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
274# Usage:
275# $(Q)$(MAKE) $(dtbinst)=dir
276dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
277
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278###
279# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
280# Usage:
281# $(Q)$(MAKE) $(clean)=dir
282clean := -f $(srctree)/scripts/Makefile.clean obj
283
284###
1846dfbd 285# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
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286# Usage:
287# $(Q)$(MAKE) $(hdr-inst)=dir
1846dfbd 288hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
371fdc77 289
beda9f3a 290# Prefix -I with $(srctree) if it is not an absolute path.
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291# skip if -I has no parameter
292addtree = $(if $(patsubst -I%,%,$(1)), \
db547ef1 293$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
5de043f4 294
d9df92e2 295# Find all -I options and call addtree
beda9f3a 296flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
d9df92e2 297
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298# echo command.
299# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
bff288c1 300echo-cmd = $(if $($(quiet)cmd_$(1)),\
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301 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
302
303# printing commands
6176aa9a 304cmd = @$(echo-cmd) $(cmd_$(1))
8ec4b4ff 305
5de043f4 306# Add $(obj)/ for paths that are not absolute
bff288c1 307objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
0a504f25 308
8ec4b4ff 309###
5de043f4 310# if_changed - execute command if any prerequisite is newer than
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311# target, or command line has changed
312# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
313# including used config symbols
314# if_changed_rule - as if_changed but execute rule instead
315# See Documentation/kbuild/makefiles.txt for more info
316
317ifneq ($(KBUILD_NOCMDDEP),1)
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318# Check if both arguments are the same including their order. Result is empty
319# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
320arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
321 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
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322else
323arg-check = $(if $(strip $(cmd_$@)),,1)
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324endif
325
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326# Replace >$< with >$$< to preserve $ when reloading the .cmd file
327# (needed for make)
322d8e79 328# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
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329# (needed for make)
330# Replace >'< with >'\''< to be able to enclose the whole string in '...'
331# (needed for the shell)
322d8e79 332make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
6176aa9a 333
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334# Find any prerequisites that is newer than target or that does not exist.
335# PHONY targets skipped in both cases.
336any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
337
5de043f4 338# Execute command if command has changed or prerequisite(s) are updated.
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339if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
340 @set -e; \
341 $(echo-cmd) $(cmd_$(1)); \
2aedcd09 342 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
8ec4b4ff 343
5de043f4 344# Execute the command and also postprocess generated .d dependencies file.
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345if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
346 @set -e; \
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347 $(cmd_and_fixdep), @:)
348
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349ifndef CONFIG_TRIM_UNUSED_KSYMS
350
e4aca459 351cmd_and_fixdep = \
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352 $(echo-cmd) $(cmd_$(1)); \
353 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
354 rm -f $(depfile); \
e4aca459 355 mv -f $(dot-target).tmp $(dot-target).cmd;
8ec4b4ff 356
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357else
358
359# Filter out exported kernel symbol names from the preprocessor output.
360# See also __KSYM_DEPS__ in include/linux/export.h.
361# We disable the depfile generation here, so as not to overwrite the existing
362# depfile while fixdep is parsing it.
363flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
364ksym_dep_filter = \
365 case "$(1)" in \
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366 cc_*_c|cpp_i_c) \
367 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
368 as_*_S|cpp_s_S) \
369 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
0d070d2b 370 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
366f4856 371 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
f110e0fe 372 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
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373
374cmd_and_fixdep = \
375 $(echo-cmd) $(cmd_$(1)); \
376 $(ksym_dep_filter) | \
377 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
378 > $(dot-target).tmp; \
379 rm -f $(depfile); \
380 mv -f $(dot-target).tmp $(dot-target).cmd;
381
382endif
383
8ec4b4ff 384# Usage: $(call if_changed_rule,foo)
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385# Will check if $(cmd_foo) or any of the prerequisites changed,
386# and if so will execute $(rule_foo).
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387if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
388 @set -e; \
2aedcd09 389 $(rule_$(1)), @:)
48f1f058 390
45d506bd 391###
312a3d09 392# why - tell why a target got built
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393# enabled by make V=2
394# Output (listed in the order they are checked):
395# (1) - due to target is PHONY
396# (2) - due to target missing
397# (3) - due to: file1.h file2.h
398# (4) - due to command line change
399# (5) - due to missing .cmd file
400# (6) - due to target not in $(targets)
401# (1) PHONY targets are always build
402# (2) No target, so we better build it
403# (3) Prerequisite is newer than target
404# (4) The command line stored in the file named dir/.target.cmd
405# differed from actual command line. This happens when compiler
406# options changes
407# (5) No dir/.target.cmd file (used to store command line)
408# (6) No dir/.target.cmd file and target not listed in $(targets)
409# This is a good hint that there is a bug in the kbuild file
410ifeq ($(KBUILD_VERBOSE),2)
411why = \
412 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
413 $(if $(wildcard $@), \
414 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
415 $(if $(arg-check), \
416 $(if $(cmd_$@),- due to command line change, \
417 $(if $(filter $@, $(targets)), \
418 - due to missing .cmd file, \
419 - due to $(notdir $@) not in $$(targets) \
420 ) \
421 ) \
422 ) \
423 ), \
424 - due to target missing \
425 ) \
426 )
427
428echo-why = $(call escsq, $(strip $(why)))
429endif
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430
431###############################################################################
432#
433# When a Kconfig string contains a filename, it is suitable for
434# passing to shell commands. It is surrounded by double-quotes, and
435# any double-quotes or backslashes within it are escaped by
436# backslashes.
437#
438# This is no use for dependencies or $(wildcard). We need to strip the
439# surrounding quotes and the escaping from quotes and backslashes, and
440# we *do* need to escape any spaces in the string. So, for example:
441#
442# Usage: $(eval $(call config_filename,FOO))
443#
444# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
445# transformed as described above to be suitable for use within the
446# makefile.
447#
448# Also, if the filename is a relative filename and exists in the source
449# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
450# be prefixed to *both* command invocation and dependencies.
451#
452# Note: We also print the filenames in the quiet_cmd_foo text, and
453# perhaps ought to have a version specially escaped for that purpose.
454# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
455# enough. It'll strip the quotes in the common case where there's no
456# space and it's a simple filename, and it'll retain the quotes when
457# there's a space. There are some esoteric cases in which it'll print
458# the wrong thing, but we don't really care. The actual dependencies
459# and commands *do* get it right, with various combinations of single
460# and double quotes, backslashes and spaces in the filenames.
461#
462###############################################################################
463#
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464define config_filename
465ifneq ($$(CONFIG_$(1)),"")
466$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
467ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
468else
469ifeq ($$(wildcard $$($(1)_FILENAME)),)
470ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
471$(1)_SRCPREFIX := $(srctree)/
472endif
473endif
474endif
475endif
476endef
477#
478###############################################################################