blob: 065324a8046ff8e0af179e6e90f335afb8d99179 [file] [log] [blame]
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
Douglas Anderson3298b692017-10-16 10:12:45 -0700102$(make-cache): ;
103-include $(make-cache)
104
Masahiro Yamada9a234a22017-11-13 19:29:34 +0900105cached-data := $(filter __cached_%, $(.VARIABLES))
106
Masahiro Yamadae17c4002017-10-13 20:25:29 +0900107# If cache exceeds 1000 lines, shrink it down to 500.
Masahiro Yamada9a234a22017-11-13 19:29:34 +0900108ifneq ($(word 1000,$(cached-data)),)
Masahiro Yamadae17c4002017-10-13 20:25:29 +0900109$(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
110 mv $(make-cache).tmp $(make-cache))
111endif
112
Masahiro Yamada9a234a22017-11-13 19:29:34 +0900113create-cache-dir := $(if $(KBUILD_SRC),$(if $(cache-data),,1))
114
Douglas Anderson3298b692017-10-16 10:12:45 -0700115# Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
116#
117# Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
118__sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
119
120# Usage: $(call shell-cached,shell_command)
121# Example: $(call shell-cached,md5sum /usr/bin/gcc)
122#
123# If we've already seen a call to this exact shell command (even in a
124# previous invocation of make!) we'll return the value. If not, we'll
125# compute it and store the result for future runs.
126#
127# This is a bit of voodoo, but basic explanation is that if the variable
128# was undefined then we'll evaluate the shell command and store the result
129# into the variable. We'll then store that value in the cache and finally
130# output the value.
131#
132# NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
133# happen to know that the caller will have their shell command in $(2) so the
134# result of "call"ing this will produce a reference to that $(2). The reason
135# for this strangeness is to avoid an extra level of eval (and escaping) of
136# $(2).
137define __run-and-store
138ifeq ($(origin $(1)),undefined)
139 $$(eval $(1) := $$(shell $$(2)))
Masahiro Yamada9a234a22017-11-13 19:29:34 +0900140ifeq ($(create-cache-dir),1)
141 $$(shell mkdir -p $(dir $(make-cache)))
142 $$(eval create-cache-dir :=)
143endif
Douglas Anderson3298b692017-10-16 10:12:45 -0700144 $$(shell echo '$(1) := $$($(1))' >> $(make-cache))
145endif
146endef
147__shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
148shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
149
Roman Zippelbeda9f32007-02-08 22:48:51 +0100150# output directory for tests below
151TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
152
153# try-run
154# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
Cao jin312a3d02017-08-02 10:31:06 +0800155# Exit code chooses option. "$$TMP" serves as a temporary file and is
156# automatically cleaned up.
Douglas Anderson3298b692017-10-16 10:12:45 -0700157__try-run = set -e; \
Roman Zippelbeda9f32007-02-08 22:48:51 +0100158 TMP="$(TMPOUT).$$$$.tmp"; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200159 TMPO="$(TMPOUT).$$$$.o"; \
Roman Zippelbeda9f32007-02-08 22:48:51 +0100160 if ($(1)) >/dev/null 2>&1; \
161 then echo "$(2)"; \
162 else echo "$(3)"; \
163 fi; \
Douglas Anderson3298b692017-10-16 10:12:45 -0700164 rm -f "$$TMP" "$$TMPO"
165
166try-run = $(shell $(__try-run))
167
168# try-run-cached
169# This works like try-run, but the result is cached.
170try-run-cached = $(call shell-cached,$(__try-run))
Roman Zippel347a00f2006-12-10 02:18:41 -0800171
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100172# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100173# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100174
Douglas Anderson3298b692017-10-16 10:12:45 -0700175as-option = $(call try-run-cached,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200176 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100177
Andi Kleene2414912006-09-26 10:52:30 +0200178# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +0100179# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100180
Douglas Anderson3298b692017-10-16 10:12:45 -0700181as-instr = $(call try-run-cached,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200182 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200183
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700184# __cc-option
185# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
Douglas Anderson3298b692017-10-16 10:12:45 -0700186__cc-option = $(call try-run-cached,\
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700187 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
188
Emese Revfyd26e9412016-06-17 23:28:34 -0700189# Do not attempt to build with gcc plugins during cc-option tests.
190# (And this uses delayed resolution so the flags will be up to date.)
191CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
192
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100193# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100194# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100195
Matthias Kaehlcke9f3f1fd2017-06-21 16:28:03 -0700196cc-option = $(call __cc-option, $(CC),\
197 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
198
199# hostcc-option
200# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
201hostcc-option = $(call __cc-option, $(HOSTCC),\
202 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100203
204# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100205# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Douglas Anderson3298b692017-10-16 10:12:45 -0700206cc-option-yn = $(call try-run-cached,\
Mark Charleboisc3f0d0b2017-03-31 22:38:13 +0200207 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100208
Michal Marek8417da6f2011-05-02 12:51:15 +0200209# cc-disable-warning
210# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
Douglas Anderson3298b692017-10-16 10:12:45 -0700211cc-disable-warning = $(call try-run-cached,\
Mark Charleboisc3f0d0b2017-03-31 22:38:13 +0200212 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
Michal Marek8417da6f2011-05-02 12:51:15 +0200213
Michal Marek5631d9c2015-08-19 17:36:41 +0200214# cc-name
215# Expands to either gcc or clang
Douglas Anderson3298b692017-10-16 10:12:45 -0700216cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
Michal Marek5631d9c2015-08-19 17:36:41 +0200217
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100218# cc-version
Douglas Anderson3298b692017-10-16 10:12:45 -0700219cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100220
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200221# cc-fullversion
Douglas Anderson3298b692017-10-16 10:12:45 -0700222cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200223 $(srctree)/scripts/gcc-version.sh -p $(CC))
224
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100225# cc-ifversion
226# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Masahiro Yamada6dcb4e52014-12-25 14:31:27 +0900227cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100228
Josh Poimboeuf3f135e52017-03-16 14:31:33 -0500229# cc-if-fullversion
230# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
231cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
232
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200233# cc-ldoption
234# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
Douglas Anderson3298b692017-10-16 10:12:45 -0700235cc-ldoption = $(call try-run-cached,\
Nick Desaulniers86a9df52017-11-06 10:47:54 -0800236 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700237
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200238# ld-option
239# Usage: LDFLAGS += $(call ld-option, -X)
Douglas Anderson3298b692017-10-16 10:12:45 -0700240ld-option = $(call try-run-cached,\
Nick Desaulniers86a9df52017-11-06 10:47:54 -0800241 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
242 $(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200243
Michal Marek40df7592011-04-20 13:45:30 +0200244# ar-option
245# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
246# Important: no spaces around options
Douglas Anderson3298b692017-10-16 10:12:45 -0700247ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
Michal Marek40df7592011-04-20 13:45:30 +0200248
Andi Kleenccbef162014-02-08 09:01:13 +0100249# ld-version
Andi Kleenccbef162014-02-08 09:01:13 +0100250# Note this is mainly for HJ Lu's 3 number binutil versions
Douglas Anderson3298b692017-10-16 10:12:45 -0700251ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
Andi Kleenccbef162014-02-08 09:01:13 +0100252
253# ld-ifversion
254# Usage: $(call ld-ifversion, -ge, 22252, y)
Masahiro Yamada6dcb4e52014-12-25 14:31:27 +0900255ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
Andi Kleenccbef162014-02-08 09:01:13 +0100256
Oleg Verych5de043f2007-02-06 02:18:21 +0100257######
258
Roman Zippelbeda9f32007-02-08 22:48:51 +0100259###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000260# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
261# Usage:
262# $(Q)$(MAKE) $(build)=dir
Masahiro Yamada5b2389b2014-09-09 20:03:58 +0900263build := -f $(srctree)/scripts/Makefile.build obj
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000264
Michal Marekbc081dd2009-12-07 16:38:33 +0100265###
266# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
267# Usage:
268# $(Q)$(MAKE) $(modbuiltin)=dir
Masahiro Yamada5b2389b2014-09-09 20:03:58 +0900269modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
Michal Marekbc081dd2009-12-07 16:38:33 +0100270
Robert Richter9fb5e532014-09-03 15:29:24 +0200271###
272# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
273# Usage:
274# $(Q)$(MAKE) $(dtbinst)=dir
275dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
276
Linus Torvaldsd08372c2014-12-20 13:31:14 -0800277###
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900278# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
279# Usage:
280# $(Q)$(MAKE) $(clean)=dir
281clean := -f $(srctree)/scripts/Makefile.clean obj
282
283###
Masahiro Yamada1846dfb2014-12-02 13:30:46 +0900284# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900285# Usage:
286# $(Q)$(MAKE) $(hdr-inst)=dir
Masahiro Yamada1846dfb2014-12-02 13:30:46 +0900287hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
Masahiro Yamada371fdc72014-11-26 19:31:13 +0900288
Roman Zippelbeda9f32007-02-08 22:48:51 +0100289# Prefix -I with $(srctree) if it is not an absolute path.
Sam Ravnborg5b91c332008-12-03 21:22:21 +0100290# skip if -I has no parameter
291addtree = $(if $(patsubst -I%,%,$(1)), \
Arnd Bergmanndb547ef2016-06-15 17:45:47 +0200292$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200293
Oleg Verych5de043f2007-02-06 02:18:21 +0100294# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100295flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100296
297# echo command.
298# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100299echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100300 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
301
302# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100303cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000304
Oleg Verych5de043f2007-02-06 02:18:21 +0100305# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100306objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200307
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000308###
Oleg Verych5de043f2007-02-06 02:18:21 +0100309# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000310# target, or command line has changed
311# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
312# including used config symbols
313# if_changed_rule - as if_changed but execute rule instead
314# See Documentation/kbuild/makefiles.txt for more info
315
316ifneq ($(KBUILD_NOCMDDEP),1)
Masahiro Yamada9c8fa9b2016-05-07 15:48:26 +0900317# Check if both arguments are the same including their order. Result is empty
318# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
319arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
320 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
Michal Marekc4d5ee12011-05-16 16:37:34 +0200321else
322arg-check = $(if $(strip $(cmd_$@)),,1)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000323endif
324
Michal Marek164f0d22014-08-07 21:39:57 +0200325# Replace >$< with >$$< to preserve $ when reloading the .cmd file
326# (needed for make)
327# Replace >#< with >\#< to avoid starting a comment in the .cmd file
328# (needed for make)
329# Replace >'< with >'\''< to be able to enclose the whole string in '...'
330# (needed for the shell)
331make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
Jan Beulich6176aa92006-01-30 10:04:27 +0100332
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200333# Find any prerequisites that is newer than target or that does not exist.
334# PHONY targets skipped in both cases.
335any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
336
Oleg Verych5de043f2007-02-06 02:18:21 +0100337# Execute command if command has changed or prerequisite(s) are updated.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200338if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
339 @set -e; \
340 $(echo-cmd) $(cmd_$(1)); \
Masahiro Yamada2aedcd02016-03-03 17:36:30 +0900341 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000342
Oleg Verych5de043f2007-02-06 02:18:21 +0100343# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200344if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
345 @set -e; \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500346 $(cmd_and_fixdep), @:)
347
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500348ifndef CONFIG_TRIM_UNUSED_KSYMS
349
Nicolas Pitree4aca452016-02-17 15:50:06 -0500350cmd_and_fixdep = \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200351 $(echo-cmd) $(cmd_$(1)); \
352 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
353 rm -f $(depfile); \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500354 mv -f $(dot-target).tmp $(dot-target).cmd;
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000355
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500356else
357
358# Filter out exported kernel symbol names from the preprocessor output.
359# See also __KSYM_DEPS__ in include/linux/export.h.
360# We disable the depfile generation here, so as not to overwrite the existing
361# depfile while fixdep is parsing it.
362flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
363ksym_dep_filter = \
364 case "$(1)" in \
Nicolas Pitre366f4852016-04-26 11:21:34 -0400365 cc_*_c|cpp_i_c) \
366 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
367 as_*_S|cpp_s_S) \
368 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
Marcin Nowakowski0d070d22017-02-13 11:15:56 +0100369 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
Nicolas Pitre366f4852016-04-26 11:21:34 -0400370 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
Nicolas Pitref110e0f2016-04-28 17:29:42 -0400371 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
Nicolas Pitrec1a95fd2016-01-22 13:41:57 -0500372
373cmd_and_fixdep = \
374 $(echo-cmd) $(cmd_$(1)); \
375 $(ksym_dep_filter) | \
376 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
377 > $(dot-target).tmp; \
378 rm -f $(depfile); \
379 mv -f $(dot-target).tmp $(dot-target).cmd;
380
381endif
382
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000383# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100384# Will check if $(cmd_foo) or any of the prerequisites changed,
385# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200386if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
387 @set -e; \
Masahiro Yamada2aedcd02016-03-03 17:36:30 +0900388 $(rule_$(1)), @:)
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200389
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200390###
Cao jin312a3d02017-08-02 10:31:06 +0800391# why - tell why a target got built
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200392# enabled by make V=2
393# Output (listed in the order they are checked):
394# (1) - due to target is PHONY
395# (2) - due to target missing
396# (3) - due to: file1.h file2.h
397# (4) - due to command line change
398# (5) - due to missing .cmd file
399# (6) - due to target not in $(targets)
400# (1) PHONY targets are always build
401# (2) No target, so we better build it
402# (3) Prerequisite is newer than target
403# (4) The command line stored in the file named dir/.target.cmd
404# differed from actual command line. This happens when compiler
405# options changes
406# (5) No dir/.target.cmd file (used to store command line)
407# (6) No dir/.target.cmd file and target not listed in $(targets)
408# This is a good hint that there is a bug in the kbuild file
409ifeq ($(KBUILD_VERBOSE),2)
410why = \
411 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
412 $(if $(wildcard $@), \
413 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
414 $(if $(arg-check), \
415 $(if $(cmd_$@),- due to command line change, \
416 $(if $(filter $@, $(targets)), \
417 - due to missing .cmd file, \
418 - due to $(notdir $@) not in $$(targets) \
419 ) \
420 ) \
421 ) \
422 ), \
423 - due to target missing \
424 ) \
425 )
426
427echo-why = $(call escsq, $(strip $(why)))
428endif
David Woodhouse3ee550f2015-08-14 16:17:16 +0100429
430###############################################################################
431#
432# When a Kconfig string contains a filename, it is suitable for
433# passing to shell commands. It is surrounded by double-quotes, and
434# any double-quotes or backslashes within it are escaped by
435# backslashes.
436#
437# This is no use for dependencies or $(wildcard). We need to strip the
438# surrounding quotes and the escaping from quotes and backslashes, and
439# we *do* need to escape any spaces in the string. So, for example:
440#
441# Usage: $(eval $(call config_filename,FOO))
442#
443# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
444# transformed as described above to be suitable for use within the
445# makefile.
446#
447# Also, if the filename is a relative filename and exists in the source
448# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
449# be prefixed to *both* command invocation and dependencies.
450#
451# Note: We also print the filenames in the quiet_cmd_foo text, and
452# perhaps ought to have a version specially escaped for that purpose.
453# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
454# enough. It'll strip the quotes in the common case where there's no
455# space and it's a simple filename, and it'll retain the quotes when
456# there's a space. There are some esoteric cases in which it'll print
457# the wrong thing, but we don't really care. The actual dependencies
458# and commands *do* get it right, with various combinations of single
459# and double quotes, backslashes and spaces in the filenames.
460#
461###############################################################################
462#
David Woodhouse3ee550f2015-08-14 16:17:16 +0100463define config_filename
464ifneq ($$(CONFIG_$(1)),"")
465$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
466ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
467else
468ifeq ($$(wildcard $$($(1)_FILENAME)),)
469ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
470$(1)_SRCPREFIX := $(srctree)/
471endif
472endif
473endif
474endif
475endef
476#
477###############################################################################