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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)
10
11###
Sam Ravnborg48f1f052006-07-23 19:37:44 +020012# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
13dot-target = $(dir $@).$(notdir $@)
14
15###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000016# The temporary file to save gcc -MD generated dependencies must not
17# contain a comma
Sam Ravnborg48f1f052006-07-23 19:37:44 +020018depfile = $(subst $(comma),_,$(dot-target).d)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000019
20###
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020021# filename of target with directory and extension stripped
22basetarget = $(basename $(notdir $@))
23
24###
Arnaud Lacombee0318d82011-06-01 17:50:25 -040025# filename of first prerequisite with directory and extension stripped
26baseprereq = $(basename $(notdir $<))
27
28###
Sam Ravnborgd51bfb72006-01-06 22:35:59 +010029# Escape single quote for use in echo statements
30escsq = $(subst $(squote),'\$(squote)',$1)
31
32###
Mike Frysinger5410ecc2008-11-06 03:31:34 -050033# Easy method for doing a status message
34 kecho := :
35 quiet_kecho := echo
36silent_kecho := :
37kecho := $($(quiet)kecho)
38
39###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000040# filechk is used to check if the content of a generated file is updated.
41# Sample usage:
42# define filechk_sample
43# echo $KERNELRELEASE
44# endef
45# version.h : Makefile
46# $(call filechk,sample)
47# The rule defined shall write to stdout the content of the new file.
48# The existing file will be compared with the new one.
49# - If no file exist it is created
50# - If the content differ the new file is used
51# - If they are equal no change, and no timestamp update
52# - stdin is piped in from the first prerequisite ($<) so one has
53# to specify a valid file as first prerequisite (often the kbuild file)
54define filechk
55 $(Q)set -e; \
Mike Frysingerfd54f502008-11-06 03:31:35 -050056 $(kecho) ' CHK $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000057 mkdir -p $(dir $@); \
58 $(filechk_$(1)) < $< > $@.tmp; \
59 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
60 rm -f $@.tmp; \
61 else \
Mike Frysingerfd54f502008-11-06 03:31:35 -050062 $(kecho) ' UPD $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000063 mv -f $@.tmp $@; \
64 fi
65endef
66
Sam Ravnborg20a468b2006-01-22 13:34:15 +010067######
Sam Ravnborg9d6e7a72006-02-18 10:03:40 +010068# gcc support functions
Sam Ravnborg20a468b2006-01-22 13:34:15 +010069# See documentation in Documentation/kbuild/makefiles.txt
70
Sam Ravnborg910b4042007-10-19 21:46:01 +020071# cc-cross-prefix
72# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
73# Return first prefix where a prefix$(CC) is found in PATH.
74# If no $(CC) found in PATH with listed prefixes return nothing
75cc-cross-prefix = \
76 $(word 1, $(foreach c,$(1), \
77 $(shell set -e; \
78 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
79 echo $(c); \
80 fi)))
81
Roman Zippelbeda9f32007-02-08 22:48:51 +010082# output directory for tests below
83TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
84
85# try-run
86# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
87# Exit code chooses option. "$$TMP" is can be used as temporary file and
88# is automatically cleaned up.
89try-run = $(shell set -e; \
90 TMP="$(TMPOUT).$$$$.tmp"; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +020091 TMPO="$(TMPOUT).$$$$.o"; \
Roman Zippelbeda9f32007-02-08 22:48:51 +010092 if ($(1)) >/dev/null 2>&1; \
93 then echo "$(2)"; \
94 else echo "$(3)"; \
95 fi; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +020096 rm -f "$$TMP" "$$TMPO")
Roman Zippel347a00f2006-12-10 02:18:41 -080097
Sam Ravnborg20a468b2006-01-22 13:34:15 +010098# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +010099# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100100
101as-option = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200102 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100103
Andi Kleene2414912006-09-26 10:52:30 +0200104# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +0100105# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100106
107as-instr = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200108 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200109
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100110# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100111# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100112
113cc-option = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200114 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100115
116# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100117# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100118cc-option-yn = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200119 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100120
121# cc-option-align
122# Prefix align with either -falign or -malign
123cc-option-align = $(subst -functions=0,,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100124 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100125
Michal Marek8417da6f2011-05-02 12:51:15 +0200126# cc-disable-warning
127# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
128cc-disable-warning = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200129 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
Michal Marek8417da6f2011-05-02 12:51:15 +0200130
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100131# cc-version
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200132# Usage gcc-ver := $(call cc-version)
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200133cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100134
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200135# cc-fullversion
136# Usage gcc-ver := $(call cc-fullversion)
137cc-fullversion = $(shell $(CONFIG_SHELL) \
138 $(srctree)/scripts/gcc-version.sh -p $(CC))
139
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100140# cc-ifversion
141# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100142cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100143
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200144# cc-ldoption
145# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
146cc-ldoption = $(call try-run,\
Jean Delvareb1e0d8b2012-10-02 16:42:36 +0200147 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700148
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200149# ld-option
150# Usage: LDFLAGS += $(call ld-option, -X)
151ld-option = $(call try-run,\
Antony Pavlov5b83df22013-04-03 18:42:33 +0400152 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200153
Michal Marek40df7592011-04-20 13:45:30 +0200154# ar-option
155# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
156# Important: no spaces around options
157ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
158
Oleg Verych5de043f2007-02-06 02:18:21 +0100159######
160
Roman Zippelbeda9f32007-02-08 22:48:51 +0100161###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000162# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
163# Usage:
164# $(Q)$(MAKE) $(build)=dir
165build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
166
Michal Marekbc081dd2009-12-07 16:38:33 +0100167###
168# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
169# Usage:
170# $(Q)$(MAKE) $(modbuiltin)=dir
171modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
172
Roman Zippelbeda9f32007-02-08 22:48:51 +0100173# Prefix -I with $(srctree) if it is not an absolute path.
Sam Ravnborg5b91c332008-12-03 21:22:21 +0100174# skip if -I has no parameter
175addtree = $(if $(patsubst -I%,%,$(1)), \
176$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200177
Oleg Verych5de043f2007-02-06 02:18:21 +0100178# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100179flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100180
181# echo command.
182# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100183echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100184 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
185
186# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100187cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000188
Oleg Verych5de043f2007-02-06 02:18:21 +0100189# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100190objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200191
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000192###
Oleg Verych5de043f2007-02-06 02:18:21 +0100193# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000194# target, or command line has changed
195# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
196# including used config symbols
197# if_changed_rule - as if_changed but execute rule instead
198# See Documentation/kbuild/makefiles.txt for more info
199
200ifneq ($(KBUILD_NOCMDDEP),1)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100201# Check if both arguments has same arguments. Result is empty string if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000202# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200203arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
204 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Michal Marekc4d5ee12011-05-16 16:37:34 +0200205else
206arg-check = $(if $(strip $(cmd_$@)),,1)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000207endif
208
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200209# >'< substitution is for echo to work,
210# >$< substitution to preserve $ when reloading .cmd file
211# note: when using inline perl scripts [perl -e '...$$t=1;...']
212# in $(cmd_xxx) double $$ your perl vars
Sascha Hauerc353acb2012-10-04 17:11:17 -0700213make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))))
Jan Beulich6176aa92006-01-30 10:04:27 +0100214
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200215# Find any prerequisites that is newer than target or that does not exist.
216# PHONY targets skipped in both cases.
217any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
218
Oleg Verych5de043f2007-02-06 02:18:21 +0100219# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500220#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200221if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
222 @set -e; \
223 $(echo-cmd) $(cmd_$(1)); \
224 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000225
Oleg Verych5de043f2007-02-06 02:18:21 +0100226# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200227if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
228 @set -e; \
229 $(echo-cmd) $(cmd_$(1)); \
230 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
231 rm -f $(depfile); \
232 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000233
234# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100235# Will check if $(cmd_foo) or any of the prerequisites changed,
236# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200237if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
238 @set -e; \
239 $(rule_$(1)))
240
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200241###
242# why - tell why a a target got build
243# enabled by make V=2
244# Output (listed in the order they are checked):
245# (1) - due to target is PHONY
246# (2) - due to target missing
247# (3) - due to: file1.h file2.h
248# (4) - due to command line change
249# (5) - due to missing .cmd file
250# (6) - due to target not in $(targets)
251# (1) PHONY targets are always build
252# (2) No target, so we better build it
253# (3) Prerequisite is newer than target
254# (4) The command line stored in the file named dir/.target.cmd
255# differed from actual command line. This happens when compiler
256# options changes
257# (5) No dir/.target.cmd file (used to store command line)
258# (6) No dir/.target.cmd file and target not listed in $(targets)
259# This is a good hint that there is a bug in the kbuild file
260ifeq ($(KBUILD_VERBOSE),2)
261why = \
262 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
263 $(if $(wildcard $@), \
264 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
265 $(if $(arg-check), \
266 $(if $(cmd_$@),- due to command line change, \
267 $(if $(filter $@, $(targets)), \
268 - due to missing .cmd file, \
269 - due to $(notdir $@) not in $$(targets) \
270 ) \
271 ) \
272 ) \
273 ), \
274 - due to target missing \
275 ) \
276 )
277
278echo-why = $(call escsq, $(strip $(why)))
279endif