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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)
Sam Ravnborgfab1e312008-02-11 14:26:26 +010049 chk_filechk = :
Mike Frysingerd75f4c62008-02-08 00:05:52 -050050 quiet_chk_filechk = echo ' CHK $@'
51silent_chk_filechk = :
Sam Ravnborgfab1e312008-02-11 14:26:26 +010052 upd_filechk = :
Mike Frysingerd75f4c62008-02-08 00:05:52 -050053 quiet_upd_filechk = echo ' UPD $@'
54silent_upd_filechk = :
Sam Ravnborgfab1e312008-02-11 14:26:26 +010055
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000056define filechk
57 $(Q)set -e; \
Mike Frysingerd75f4c62008-02-08 00:05:52 -050058 $($(quiet)chk_filechk); \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000059 mkdir -p $(dir $@); \
60 $(filechk_$(1)) < $< > $@.tmp; \
61 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
62 rm -f $@.tmp; \
63 else \
Mike Frysingerd75f4c62008-02-08 00:05:52 -050064 $($(quiet)upd_filechk); \
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000065 mv -f $@.tmp $@; \
66 fi
67endef
68
Sam Ravnborg20a468b2006-01-22 13:34:15 +010069######
Sam Ravnborg9d6e7a72006-02-18 10:03:40 +010070# gcc support functions
Sam Ravnborg20a468b2006-01-22 13:34:15 +010071# See documentation in Documentation/kbuild/makefiles.txt
72
Sam Ravnborg910b4042007-10-19 21:46:01 +020073# cc-cross-prefix
74# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
75# Return first prefix where a prefix$(CC) is found in PATH.
76# If no $(CC) found in PATH with listed prefixes return nothing
77cc-cross-prefix = \
78 $(word 1, $(foreach c,$(1), \
79 $(shell set -e; \
80 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
81 echo $(c); \
82 fi)))
83
Roman Zippelbeda9f32007-02-08 22:48:51 +010084# output directory for tests below
85TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
86
87# try-run
88# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
89# Exit code chooses option. "$$TMP" is can be used as temporary file and
90# is automatically cleaned up.
91try-run = $(shell set -e; \
92 TMP="$(TMPOUT).$$$$.tmp"; \
93 if ($(1)) >/dev/null 2>&1; \
94 then echo "$(2)"; \
95 else echo "$(3)"; \
96 fi; \
97 rm -f "$$TMP")
Roman Zippel347a00f2006-12-10 02:18:41 -080098
Sam Ravnborg20a468b2006-01-22 13:34:15 +010099# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100100# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100101
102as-option = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +0200103 $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100104
Andi Kleene2414912006-09-26 10:52:30 +0200105# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +0100106# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100107
108as-instr = $(call try-run,\
Sam Ravnborg222d3942007-10-15 21:59:31 +0200109 echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200110
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100111# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100112# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100113
114cc-option = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700115 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100116
117# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100118# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100119cc-option-yn = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700120 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100121
122# cc-option-align
123# Prefix align with either -falign or -malign
124cc-option-align = $(subst -functions=0,,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100125 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100126
127# cc-version
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200128# Usage gcc-ver := $(call cc-version)
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200129cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100130
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200131# cc-fullversion
132# Usage gcc-ver := $(call cc-fullversion)
133cc-fullversion = $(shell $(CONFIG_SHELL) \
134 $(srctree)/scripts/gcc-version.sh -p $(CC))
135
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100136# cc-ifversion
137# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100138cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100139
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700140# ld-option
141# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100142ld-option = $(call try-run,\
143 $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700144
Oleg Verych5de043f2007-02-06 02:18:21 +0100145######
146
Roman Zippelbeda9f32007-02-08 22:48:51 +0100147###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000148# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
149# Usage:
150# $(Q)$(MAKE) $(build)=dir
151build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
152
Roman Zippelbeda9f32007-02-08 22:48:51 +0100153# Prefix -I with $(srctree) if it is not an absolute path.
Sam Ravnborg5b91c332008-12-03 21:22:21 +0100154# skip if -I has no parameter
155addtree = $(if $(patsubst -I%,%,$(1)), \
156$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200157
Oleg Verych5de043f2007-02-06 02:18:21 +0100158# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100159flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100160
161# echo command.
162# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100163echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100164 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
165
166# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100167cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000168
Oleg Verych5de043f2007-02-06 02:18:21 +0100169# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100170objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200171
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000172###
Oleg Verych5de043f2007-02-06 02:18:21 +0100173# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000174# target, or command line has changed
175# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
176# including used config symbols
177# if_changed_rule - as if_changed but execute rule instead
178# See Documentation/kbuild/makefiles.txt for more info
179
180ifneq ($(KBUILD_NOCMDDEP),1)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100181# Check if both arguments has same arguments. Result is empty string if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000182# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200183arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
184 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000185endif
186
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200187# >'< substitution is for echo to work,
188# >$< substitution to preserve $ when reloading .cmd file
189# note: when using inline perl scripts [perl -e '...$$t=1;...']
190# in $(cmd_xxx) double $$ your perl vars
Jan Beulich6176aa92006-01-30 10:04:27 +0100191make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
192
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200193# Find any prerequisites that is newer than target or that does not exist.
194# PHONY targets skipped in both cases.
195any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
196
Oleg Verych5de043f2007-02-06 02:18:21 +0100197# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500198#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200199if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
200 @set -e; \
201 $(echo-cmd) $(cmd_$(1)); \
202 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000203
Oleg Verych5de043f2007-02-06 02:18:21 +0100204# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200205if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
206 @set -e; \
207 $(echo-cmd) $(cmd_$(1)); \
208 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
209 rm -f $(depfile); \
210 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000211
212# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100213# Will check if $(cmd_foo) or any of the prerequisites changed,
214# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200215if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
216 @set -e; \
217 $(rule_$(1)))
218
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200219###
220# why - tell why a a target got build
221# enabled by make V=2
222# Output (listed in the order they are checked):
223# (1) - due to target is PHONY
224# (2) - due to target missing
225# (3) - due to: file1.h file2.h
226# (4) - due to command line change
227# (5) - due to missing .cmd file
228# (6) - due to target not in $(targets)
229# (1) PHONY targets are always build
230# (2) No target, so we better build it
231# (3) Prerequisite is newer than target
232# (4) The command line stored in the file named dir/.target.cmd
233# differed from actual command line. This happens when compiler
234# options changes
235# (5) No dir/.target.cmd file (used to store command line)
236# (6) No dir/.target.cmd file and target not listed in $(targets)
237# This is a good hint that there is a bug in the kbuild file
238ifeq ($(KBUILD_VERBOSE),2)
239why = \
240 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
241 $(if $(wildcard $@), \
242 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
243 $(if $(arg-check), \
244 $(if $(cmd_$@),- due to command line change, \
245 $(if $(filter $@, $(targets)), \
246 - due to missing .cmd file, \
247 - due to $(notdir $@) not in $$(targets) \
248 ) \
249 ) \
250 ) \
251 ), \
252 - due to target missing \
253 ) \
254 )
255
256echo-why = $(call escsq, $(strip $(why)))
257endif