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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 := ,
Sam Ravnborgd51bfb72006-01-06 22:35:59 +01006squote := '
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +00007empty :=
8space := $(empty) $(empty)
9
10###
Sam Ravnborg48f1f052006-07-23 19:37:44 +020011# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
12dot-target = $(dir $@).$(notdir $@)
13
14###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000015# The temporary file to save gcc -MD generated dependencies must not
16# contain a comma
Sam Ravnborg48f1f052006-07-23 19:37:44 +020017depfile = $(subst $(comma),_,$(dot-target).d)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000018
19###
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020020# filename of target with directory and extension stripped
21basetarget = $(basename $(notdir $@))
22
23###
Sam Ravnborgd51bfb72006-01-06 22:35:59 +010024# Escape single quote for use in echo statements
25escsq = $(subst $(squote),'\$(squote)',$1)
26
27###
Mike Frysinger5410ecc2008-11-06 03:31:34 -050028# Easy method for doing a status message
29 kecho := :
30 quiet_kecho := echo
31silent_kecho := :
32kecho := $($(quiet)kecho)
33
34###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000035# filechk is used to check if the content of a generated file is updated.
36# Sample usage:
37# define filechk_sample
38# echo $KERNELRELEASE
39# endef
40# version.h : Makefile
41# $(call filechk,sample)
42# The rule defined shall write to stdout the content of the new file.
43# The existing file will be compared with the new one.
44# - If no file exist it is created
45# - If the content differ the new file is used
46# - If they are equal no change, and no timestamp update
47# - stdin is piped in from the first prerequisite ($<) so one has
48# to specify a valid file as first prerequisite (often the kbuild file)
49define filechk
50 $(Q)set -e; \
Mike Frysingerfd54f502008-11-06 03:31:35 -050051 $(kecho) ' CHK $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000052 mkdir -p $(dir $@); \
53 $(filechk_$(1)) < $< > $@.tmp; \
54 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
55 rm -f $@.tmp; \
56 else \
Mike Frysingerfd54f502008-11-06 03:31:35 -050057 $(kecho) ' UPD $@'; \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000058 mv -f $@.tmp $@; \
59 fi
60endef
61
Sam Ravnborg20a468b2006-01-22 13:34:15 +010062######
Sam Ravnborg9d6e7a72006-02-18 10:03:40 +010063# gcc support functions
Sam Ravnborg20a468b2006-01-22 13:34:15 +010064# See documentation in Documentation/kbuild/makefiles.txt
65
Sam Ravnborg910b4042007-10-19 21:46:01 +020066# cc-cross-prefix
67# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
68# Return first prefix where a prefix$(CC) is found in PATH.
69# If no $(CC) found in PATH with listed prefixes return nothing
70cc-cross-prefix = \
71 $(word 1, $(foreach c,$(1), \
72 $(shell set -e; \
73 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
74 echo $(c); \
75 fi)))
76
Roman Zippelbeda9f32007-02-08 22:48:51 +010077# output directory for tests below
78TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
79
80# try-run
81# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
82# Exit code chooses option. "$$TMP" is can be used as temporary file and
83# is automatically cleaned up.
84try-run = $(shell set -e; \
85 TMP="$(TMPOUT).$$$$.tmp"; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +020086 TMPO="$(TMPOUT).$$$$.o"; \
Roman Zippelbeda9f32007-02-08 22:48:51 +010087 if ($(1)) >/dev/null 2>&1; \
88 then echo "$(2)"; \
89 else echo "$(3)"; \
90 fi; \
Sam Ravnborg691ef3e2009-09-19 10:31:45 +020091 rm -f "$$TMP" "$$TMPO")
Roman Zippel347a00f2006-12-10 02:18:41 -080092
Sam Ravnborg20a468b2006-01-22 13:34:15 +010093# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +010094# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +010095
96as-option = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +020097 $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010098
Andi Kleene2414912006-09-26 10:52:30 +020099# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +0100100# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100101
102as-instr = $(call try-run,\
Sam Ravnborg222d3942007-10-15 21:59:31 +0200103 echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200104
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100105# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100106# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100107
108cc-option = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700109 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100110
111# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100112# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100113cc-option-yn = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700114 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100115
116# cc-option-align
117# Prefix align with either -falign or -malign
118cc-option-align = $(subst -functions=0,,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100119 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100120
121# cc-version
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200122# Usage gcc-ver := $(call cc-version)
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200123cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100124
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200125# cc-fullversion
126# Usage gcc-ver := $(call cc-fullversion)
127cc-fullversion = $(shell $(CONFIG_SHELL) \
128 $(srctree)/scripts/gcc-version.sh -p $(CC))
129
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100130# cc-ifversion
131# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100132cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100133
Sam Ravnborgf86fd302009-09-19 10:14:33 +0200134# cc-ldoption
135# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
136cc-ldoption = $(call try-run,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100137 $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700138
Sam Ravnborg691ef3e2009-09-19 10:31:45 +0200139# ld-option
140# Usage: LDFLAGS += $(call ld-option, -X)
141ld-option = $(call try-run,\
142 $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
143
Oleg Verych5de043f2007-02-06 02:18:21 +0100144######
145
Roman Zippelbeda9f32007-02-08 22:48:51 +0100146###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000147# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
148# Usage:
149# $(Q)$(MAKE) $(build)=dir
150build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
151
Roman Zippelbeda9f32007-02-08 22:48:51 +0100152# Prefix -I with $(srctree) if it is not an absolute path.
Sam Ravnborg5b91c332008-12-03 21:22:21 +0100153# skip if -I has no parameter
154addtree = $(if $(patsubst -I%,%,$(1)), \
155$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200156
Oleg Verych5de043f2007-02-06 02:18:21 +0100157# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100158flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100159
160# echo command.
161# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100162echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100163 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
164
165# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100166cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000167
Oleg Verych5de043f2007-02-06 02:18:21 +0100168# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100169objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200170
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000171###
Oleg Verych5de043f2007-02-06 02:18:21 +0100172# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000173# target, or command line has changed
174# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
175# including used config symbols
176# if_changed_rule - as if_changed but execute rule instead
177# See Documentation/kbuild/makefiles.txt for more info
178
179ifneq ($(KBUILD_NOCMDDEP),1)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100180# Check if both arguments has same arguments. Result is empty string if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000181# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200182arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
183 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000184endif
185
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200186# >'< substitution is for echo to work,
187# >$< substitution to preserve $ when reloading .cmd file
188# note: when using inline perl scripts [perl -e '...$$t=1;...']
189# in $(cmd_xxx) double $$ your perl vars
Jan Beulich6176aa92006-01-30 10:04:27 +0100190make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
191
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200192# Find any prerequisites that is newer than target or that does not exist.
193# PHONY targets skipped in both cases.
194any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
195
Oleg Verych5de043f2007-02-06 02:18:21 +0100196# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500197#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200198if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
199 @set -e; \
200 $(echo-cmd) $(cmd_$(1)); \
201 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000202
Oleg Verych5de043f2007-02-06 02:18:21 +0100203# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200204if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
205 @set -e; \
206 $(echo-cmd) $(cmd_$(1)); \
207 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
208 rm -f $(depfile); \
209 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000210
211# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100212# Will check if $(cmd_foo) or any of the prerequisites changed,
213# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200214if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
215 @set -e; \
216 $(rule_$(1)))
217
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200218###
219# why - tell why a a target got build
220# enabled by make V=2
221# Output (listed in the order they are checked):
222# (1) - due to target is PHONY
223# (2) - due to target missing
224# (3) - due to: file1.h file2.h
225# (4) - due to command line change
226# (5) - due to missing .cmd file
227# (6) - due to target not in $(targets)
228# (1) PHONY targets are always build
229# (2) No target, so we better build it
230# (3) Prerequisite is newer than target
231# (4) The command line stored in the file named dir/.target.cmd
232# differed from actual command line. This happens when compiler
233# options changes
234# (5) No dir/.target.cmd file (used to store command line)
235# (6) No dir/.target.cmd file and target not listed in $(targets)
236# This is a good hint that there is a bug in the kbuild file
237ifeq ($(KBUILD_VERBOSE),2)
238why = \
239 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
240 $(if $(wildcard $@), \
241 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
242 $(if $(arg-check), \
243 $(if $(cmd_$@),- due to command line change, \
244 $(if $(filter $@, $(targets)), \
245 - due to missing .cmd file, \
246 - due to $(notdir $@) not in $$(targets) \
247 ) \
248 ) \
249 ) \
250 ), \
251 - due to target missing \
252 ) \
253 )
254
255echo-why = $(call escsq, $(strip $(why)))
256endif