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Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +00001####
2# kbuild: Generic definitions
3
Roman Zippelbeda9f32007-02-08 22:48:51 +01004# Convenient variables
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +00005comma := ,
Masahiro Yamada13338932014-03-20 11:08:20 +09006quote := "
Sam Ravnborgd51bfb72006-01-06 22:35:59 +01007squote := '
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +00008empty :=
9space := $(empty) $(empty)
Masahiro Yamada9c8fa9b2016-05-07 15:48:26 +090010space_escape := _-_SPACE_-_
Douglas Anderson3298b692017-10-16 10:12:45 -070011right_paren := )
12left_paren := (
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000013
14###
Sam Ravnborg48f1f052006-07-23 19:37:44 +020015# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
16dot-target = $(dir $@).$(notdir $@)
17
18###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000019# The temporary file to save gcc -MD generated dependencies must not
20# contain a comma
Sam Ravnborg48f1f052006-07-23 19:37:44 +020021depfile = $(subst $(comma),_,$(dot-target).d)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000022
23###
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020024# filename of target with directory and extension stripped
25basetarget = $(basename $(notdir $@))
26
27###
Arnaud Lacombee0318d82011-06-01 17:50:25 -040028# filename of first prerequisite with directory and extension stripped
29baseprereq = $(basename $(notdir $<))
30
31###
Sam Ravnborgd51bfb72006-01-06 22:35:59 +010032# Escape single quote for use in echo statements
33escsq = $(subst $(squote),'\$(squote)',$1)
34
35###
Mike Frysinger5410ecc2008-11-06 03:31:34 -050036# Easy method for doing a status message
37 kecho := :
38 quiet_kecho := echo
39silent_kecho := :
40kecho := $($(quiet)kecho)
41
42###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000043# filechk is used to check if the content of a generated file is updated.
44# Sample usage:
45# define filechk_sample
46# echo $KERNELRELEASE
47# endef
48# version.h : Makefile
49# $(call filechk,sample)
50# The rule defined shall write to stdout the content of the new file.
51# The existing file will be compared with the new one.
52# - If no file exist it is created
53# - If the content differ the new file is used
54# - If they are equal no change, and no timestamp update
55# - stdin is piped in from the first prerequisite ($<) so one has
56# to specify a valid file as first prerequisite (often the kbuild file)
57define filechk
58 $(Q)set -e; \
Mike Frysingerfd54f502008-11-06 03:31:35 -050059 $(kecho) ' CHK $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000060 mkdir -p $(dir $@); \
61 $(filechk_$(1)) < $< > $@.tmp; \
62 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
63 rm -f $@.tmp; \
64 else \
Mike Frysingerfd54f502008-11-06 03:31:35 -050065 $(kecho) ' UPD $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000066 mv -f $@.tmp $@; \
67 fi
68endef
69
Sam Ravnborg20a468b2006-01-22 13:34:15 +010070######
Sam Ravnborg9d6e7a72006-02-18 10:03:40 +010071# gcc support functions
Sam Ravnborg20a468b2006-01-22 13:34:15 +010072# See documentation in Documentation/kbuild/makefiles.txt
73
Sam Ravnborg910b4042007-10-19 21:46:01 +020074# cc-cross-prefix
75# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
76# Return first prefix where a prefix$(CC) is found in PATH.
77# If no $(CC) found in PATH with listed prefixes return nothing
78cc-cross-prefix = \
79 $(word 1, $(foreach c,$(1), \
80 $(shell set -e; \
81 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
82 echo $(c); \
83 fi)))
84
Douglas Anderson3298b692017-10-16 10:12:45 -070085# Tools for caching Makefile variables that are "expensive" to compute.
86#
87# Here we want to help deal with variables that take a long time to compute
88# by making it easy to store these variables in a cache.
89#
90# The canonical example here is testing for compiler flags. On a simple system
91# each call to the compiler takes 10 ms, but on a system with a compiler that's
92# called through various wrappers it can take upwards of 100 ms. If we have
93# 100 calls to the compiler this can take 1 second (on a simple system) or 10
94# seconds (on a complicated system).
95#
96# The "cache" will be in Makefile syntax and can be directly included.
97# Any time we try to reference a variable that's not in the cache we'll
98# calculate it and store it in the cache for next time.
99
100# Include values from last time
101make-cache := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/,$(if $(obj),$(obj)/)).cache.mk
102ifeq ($(wildcard $(dir $(make-cache))),)
103$(shell mkdir -p '$(dir $(make-cache))')
104endif
105$(make-cache): ;
106-include $(make-cache)
107
Masahiro Yamadae17c4002017-10-13 20:25:29 +0900108# If cache exceeds 1000 lines, shrink it down to 500.
109ifneq ($(word 1000,$(filter __cached_%, $(.VARIABLES))),)
110$(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
111 mv $(make-cache).tmp $(make-cache))
112endif
113
Douglas Anderson3298b692017-10-16 10:12:45 -0700114# Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
115#
116# Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
117__sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
118
119# Usage: $(call shell-cached,shell_command)
120# Example: $(call shell-cached,md5sum /usr/bin/gcc)
121#
122# If we've already seen a call to this exact shell command (even in a
123# previous invocation of make!) we'll return the value. If not, we'll
124# compute it and store the result for future runs.
125#
126# This is a bit of voodoo, but basic explanation is that if the variable
127# was undefined then we'll evaluate the shell command and store the result
128# into the variable. We'll then store that value in the cache and finally
129# output the value.
130#
131# NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
132# happen to know that the caller will have their shell command in $(2) so the
133# result of "call"ing this will produce a reference to that $(2). The reason
134# for this strangeness is to avoid an extra level of eval (and escaping) of
135# $(2).
136define __run-and-store
137ifeq ($(origin $(1)),undefined)
138 $$(eval $(1) := $$(shell $$(2)))
139 $$(shell echo '$(1) := $$($(1))' >> $(make-cache))
140endif
141endef
142__shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
143shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
144
Roman Zippelbeda9f32007-02-08 22:48:51 +0100145# output directory for tests below
146TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
147
148# try-run
149# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
Cao jin312a3d02017-08-02 10:31:06 +0800150# Exit code chooses option. "$$TMP" serves as a temporary file and is
151# automatically cleaned up.
Douglas Anderson3298b692017-10-16 10:12:45 -0700152__try-run = set -e; \
Roman Zippelbeda9f32007-02-08 22:48:51 +0100153 TMP="$(TMPOUT).$$$$.tmp"; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200154 TMPO="$(TMPOUT).$$$$.o"; \
Roman Zippelbeda9f32007-02-08 22:48:51 +0100155 if ($(1)) >/dev/null 2>&1; \
156 then echo "$(2)"; \
157 else echo "$(3)"; \
158 fi; \
Douglas Anderson3298b692017-10-16 10:12:45 -0700159 rm -f "$$TMP" "$$TMPO"
160
161try-run = $(shell $(__try-run))
162
163# try-run-cached
164# This works like try-run, but the result is cached.
165try-run-cached = $(call shell-cached,$(__try-run))
Roman Zippel347a00f2006-12-10 02:18:41 -0800166
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100167# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100168# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100169
Douglas Anderson3298b692017-10-16 10:12:45 -0700170as-option = $(call try-run-cached,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200171 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100172
Andi Kleene2414912006-09-26 10:52:30 +0200173# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +0100174# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100175
Douglas Anderson3298b692017-10-16 10:12:45 -0700176as-instr = $(call try-run-cached,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200177 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200178
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700179# __cc-option
180# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
Douglas Anderson3298b692017-10-16 10:12:45 -0700181__cc-option = $(call try-run-cached,\
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700182 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
183
Emese Revfyd26e9412016-06-17 23:28:34 -0700184# Do not attempt to build with gcc plugins during cc-option tests.
185# (And this uses delayed resolution so the flags will be up to date.)
186CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
187
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100188# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100189# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100190
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700191cc-option = $(call __cc-option, $(CC),\
192 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
193
194# hostcc-option
195# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
196hostcc-option = $(call __cc-option, $(HOSTCC),\
197 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100198
199# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100200# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Douglas Anderson3298b692017-10-16 10:12:45 -0700201cc-option-yn = $(call try-run-cached,\
Mark Charleboisc3f0d0b2017-03-31 22:38:13 +0200202 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100203
Michal Marek8417da6f2011-05-02 12:51:15 +0200204# cc-disable-warning
205# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
Douglas Anderson3298b692017-10-16 10:12:45 -0700206cc-disable-warning = $(call try-run-cached,\
Mark Charleboisc3f0d0b2017-03-31 22:38:13 +0200207 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
Michal Marek8417da6f2011-05-02 12:51:15 +0200208
Michal Marek5631d9c2015-08-19 17:36:41 +0200209# cc-name
210# Expands to either gcc or clang
Douglas Anderson3298b692017-10-16 10:12:45 -0700211cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
Michal Marek5631d9c2015-08-19 17:36:41 +0200212
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100213# cc-version
Douglas Anderson3298b692017-10-16 10:12:45 -0700214cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100215
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200216# cc-fullversion
Douglas Anderson3298b692017-10-16 10:12:45 -0700217cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200218 $(srctree)/scripts/gcc-version.sh -p $(CC))
219
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100220# cc-ifversion
221# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Masahiro Yamada6dcb4e52014-12-25 14:31:27 +0900222cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100223
Josh Poimboeuf3f135e52017-03-16 14:31:33 -0500224# cc-if-fullversion
225# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
226cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
227
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200228# cc-ldoption
229# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
Douglas Anderson3298b692017-10-16 10:12:45 -0700230cc-ldoption = $(call try-run-cached,\
Nick Desaulniers86a9df52017-11-06 10:47:54 -0800231 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700232
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200233# ld-option
234# Usage: LDFLAGS += $(call ld-option, -X)
Douglas Anderson3298b692017-10-16 10:12:45 -0700235ld-option = $(call try-run-cached,\
Nick Desaulniers86a9df52017-11-06 10:47:54 -0800236 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
237 $(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200238
Michal Marek40df7592011-04-20 13:45:30 +0200239# ar-option
240# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
241# Important: no spaces around options
Douglas Anderson3298b692017-10-16 10:12:45 -0700242ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
Michal Marek40df7592011-04-20 13:45:30 +0200243
Andi Kleenccbef162014-02-08 09:01:13 +0100244# ld-version
Andi Kleenccbef162014-02-08 09:01:13 +0100245# Note this is mainly for HJ Lu's 3 number binutil versions
Douglas Anderson3298b692017-10-16 10:12:45 -0700246ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
Andi Kleenccbef162014-02-08 09:01:13 +0100247
248# ld-ifversion
249# Usage: $(call ld-ifversion, -ge, 22252, y)
Masahiro Yamada6dcb4e52014-12-25 14:31:27 +0900250ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
Andi Kleenccbef162014-02-08 09:01:13 +0100251
Oleg Verych5de043f2007-02-06 02:18:21 +0100252######
253
Roman Zippelbeda9f32007-02-08 22:48:51 +0100254###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000255# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
256# Usage:
257# $(Q)$(MAKE) $(build)=dir
Masahiro Yamada5b2389b2014-09-09 20:03:58 +0900258build := -f $(srctree)/scripts/Makefile.build obj
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000259
Michal Marekbc081dd2009-12-07 16:38:33 +0100260###
261# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
262# Usage:
263# $(Q)$(MAKE) $(modbuiltin)=dir
Masahiro Yamada5b2389b2014-09-09 20:03:58 +0900264modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
Michal Marekbc081dd2009-12-07 16:38:33 +0100265
Robert Richter9fb5e532014-09-03 15:29:24 +0200266###
267# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
268# Usage:
269# $(Q)$(MAKE) $(dtbinst)=dir
270dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
271
Linus Torvaldsd08372c2014-12-20 13:31:14 -0800272###
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900273# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
274# Usage:
275# $(Q)$(MAKE) $(clean)=dir
276clean := -f $(srctree)/scripts/Makefile.clean obj
277
278###
Masahiro Yamada1846dfb2014-12-02 13:30:46 +0900279# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900280# Usage:
281# $(Q)$(MAKE) $(hdr-inst)=dir
Masahiro Yamada1846dfb2014-12-02 13:30:46 +0900282hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900283
Roman Zippelbeda9f32007-02-08 22:48:51 +0100284# Prefix -I with $(srctree) if it is not an absolute path.
Sam Ravnborg5b91c332008-12-03 21:22:21 +0100285# skip if -I has no parameter
286addtree = $(if $(patsubst -I%,%,$(1)), \
Arnd Bergmanndb547ef2016-06-15 17:45:47 +0200287$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200288
Oleg Verych5de043f2007-02-06 02:18:21 +0100289# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100290flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100291
292# echo command.
293# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100294echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100295 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
296
297# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100298cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000299
Oleg Verych5de043f2007-02-06 02:18:21 +0100300# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100301objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200302
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000303###
Oleg Verych5de043f2007-02-06 02:18:21 +0100304# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000305# target, or command line has changed
306# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
307# including used config symbols
308# if_changed_rule - as if_changed but execute rule instead
309# See Documentation/kbuild/makefiles.txt for more info
310
311ifneq ($(KBUILD_NOCMDDEP),1)
Masahiro Yamada9c8fa9b2016-05-07 15:48:26 +0900312# Check if both arguments are the same including their order. Result is empty
313# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
314arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
315 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
Michal Marekc4d5ee12011-05-16 16:37:34 +0200316else
317arg-check = $(if $(strip $(cmd_$@)),,1)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000318endif
319
Michal Marek164f0d22014-08-07 21:39:57 +0200320# Replace >$< with >$$< to preserve $ when reloading the .cmd file
321# (needed for make)
322# Replace >#< with >\#< to avoid starting a comment in the .cmd file
323# (needed for make)
324# Replace >'< with >'\''< to be able to enclose the whole string in '...'
325# (needed for the shell)
326make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
Jan Beulich6176aa92006-01-30 10:04:27 +0100327
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200328# Find any prerequisites that is newer than target or that does not exist.
329# PHONY targets skipped in both cases.
330any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
331
Oleg Verych5de043f2007-02-06 02:18:21 +0100332# Execute command if command has changed or prerequisite(s) are updated.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200333if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
334 @set -e; \
335 $(echo-cmd) $(cmd_$(1)); \
Masahiro Yamada2aedcd02016-03-03 17:36:30 +0900336 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000337
Oleg Verych5de043f2007-02-06 02:18:21 +0100338# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200339if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
340 @set -e; \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500341 $(cmd_and_fixdep), @:)
342
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500343ifndef CONFIG_TRIM_UNUSED_KSYMS
344
Nicolas Pitree4aca452016-02-17 15:50:06 -0500345cmd_and_fixdep = \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200346 $(echo-cmd) $(cmd_$(1)); \
347 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
348 rm -f $(depfile); \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500349 mv -f $(dot-target).tmp $(dot-target).cmd;
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000350
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500351else
352
353# Filter out exported kernel symbol names from the preprocessor output.
354# See also __KSYM_DEPS__ in include/linux/export.h.
355# We disable the depfile generation here, so as not to overwrite the existing
356# depfile while fixdep is parsing it.
357flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
358ksym_dep_filter = \
359 case "$(1)" in \
Nicolas Pitre366f4852016-04-26 11:21:34 -0400360 cc_*_c|cpp_i_c) \
361 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
362 as_*_S|cpp_s_S) \
363 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
Marcin Nowakowski0d070d22017-02-13 11:15:56 +0100364 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
Nicolas Pitre366f4852016-04-26 11:21:34 -0400365 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
Nicolas Pitref110e0f2016-04-28 17:29:42 -0400366 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500367
368cmd_and_fixdep = \
369 $(echo-cmd) $(cmd_$(1)); \
370 $(ksym_dep_filter) | \
371 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
372 > $(dot-target).tmp; \
373 rm -f $(depfile); \
374 mv -f $(dot-target).tmp $(dot-target).cmd;
375
376endif
377
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000378# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100379# Will check if $(cmd_foo) or any of the prerequisites changed,
380# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200381if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
382 @set -e; \
Masahiro Yamada2aedcd02016-03-03 17:36:30 +0900383 $(rule_$(1)), @:)
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200384
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200385###
Cao jin312a3d02017-08-02 10:31:06 +0800386# why - tell why a target got built
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200387# enabled by make V=2
388# Output (listed in the order they are checked):
389# (1) - due to target is PHONY
390# (2) - due to target missing
391# (3) - due to: file1.h file2.h
392# (4) - due to command line change
393# (5) - due to missing .cmd file
394# (6) - due to target not in $(targets)
395# (1) PHONY targets are always build
396# (2) No target, so we better build it
397# (3) Prerequisite is newer than target
398# (4) The command line stored in the file named dir/.target.cmd
399# differed from actual command line. This happens when compiler
400# options changes
401# (5) No dir/.target.cmd file (used to store command line)
402# (6) No dir/.target.cmd file and target not listed in $(targets)
403# This is a good hint that there is a bug in the kbuild file
404ifeq ($(KBUILD_VERBOSE),2)
405why = \
406 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
407 $(if $(wildcard $@), \
408 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
409 $(if $(arg-check), \
410 $(if $(cmd_$@),- due to command line change, \
411 $(if $(filter $@, $(targets)), \
412 - due to missing .cmd file, \
413 - due to $(notdir $@) not in $$(targets) \
414 ) \
415 ) \
416 ) \
417 ), \
418 - due to target missing \
419 ) \
420 )
421
422echo-why = $(call escsq, $(strip $(why)))
423endif
David Woodhouse3ee550f2015-08-14 16:17:16 +0100424
425###############################################################################
426#
427# When a Kconfig string contains a filename, it is suitable for
428# passing to shell commands. It is surrounded by double-quotes, and
429# any double-quotes or backslashes within it are escaped by
430# backslashes.
431#
432# This is no use for dependencies or $(wildcard). We need to strip the
433# surrounding quotes and the escaping from quotes and backslashes, and
434# we *do* need to escape any spaces in the string. So, for example:
435#
436# Usage: $(eval $(call config_filename,FOO))
437#
438# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
439# transformed as described above to be suitable for use within the
440# makefile.
441#
442# Also, if the filename is a relative filename and exists in the source
443# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
444# be prefixed to *both* command invocation and dependencies.
445#
446# Note: We also print the filenames in the quiet_cmd_foo text, and
447# perhaps ought to have a version specially escaped for that purpose.
448# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
449# enough. It'll strip the quotes in the common case where there's no
450# space and it's a simple filename, and it'll retain the quotes when
451# there's a space. There are some esoteric cases in which it'll print
452# the wrong thing, but we don't really care. The actual dependencies
453# and commands *do* get it right, with various combinations of single
454# and double quotes, backslashes and spaces in the filenames.
455#
456###############################################################################
457#
David Woodhouse3ee550f2015-08-14 16:17:16 +0100458define config_filename
459ifneq ($$(CONFIG_$(1)),"")
460$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
461ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
462else
463ifeq ($$(wildcard $$($(1)_FILENAME)),)
464ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
465$(1)_SRCPREFIX := $(srctree)/
466endif
467endif
468endif
469endif
470endef
471#
472###############################################################################