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Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +00001####
2# kbuild: Generic definitions
3
Oleg Verych5de043f2007-02-06 02:18:21 +01004# Convenient constants
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###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000028# filechk is used to check if the content of a generated file is updated.
29# Sample usage:
30# define filechk_sample
31# echo $KERNELRELEASE
32# endef
33# version.h : Makefile
34# $(call filechk,sample)
35# The rule defined shall write to stdout the content of the new file.
36# The existing file will be compared with the new one.
37# - If no file exist it is created
38# - If the content differ the new file is used
39# - If they are equal no change, and no timestamp update
40# - stdin is piped in from the first prerequisite ($<) so one has
41# to specify a valid file as first prerequisite (often the kbuild file)
42define filechk
43 $(Q)set -e; \
44 echo ' CHK $@'; \
45 mkdir -p $(dir $@); \
46 $(filechk_$(1)) < $< > $@.tmp; \
47 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
48 rm -f $@.tmp; \
49 else \
50 echo ' UPD $@'; \
51 mv -f $@.tmp $@; \
52 fi
53endef
54
Sam Ravnborg20a468b2006-01-22 13:34:15 +010055######
Sam Ravnborg9d6e7a72006-02-18 10:03:40 +010056# gcc support functions
Sam Ravnborg20a468b2006-01-22 13:34:15 +010057# See documentation in Documentation/kbuild/makefiles.txt
58
Oleg Verych5de043f2007-02-06 02:18:21 +010059# checker-shell
Oleg Verychbff288c2007-02-07 23:04:35 +010060# Usage: option = $(call checker-shell,$(CC)...-o $$OUT,option-ok,otherwise)
Oleg Verych5de043f2007-02-06 02:18:21 +010061# Exit code chooses option. $$OUT is safe location for needless output.
62define checker-shell
63 $(shell set -e; \
64 DIR=$(KBUILD_EXTMOD); \
65 cd $${DIR:-$(objtree)}; \
66 OUT=$$PWD/.$$$$.null; \
67 \
68 ln -s /dev/null $$OUT; \
69 if $(1) >/dev/null 2>&1; \
70 then echo "$(2)"; \
71 else echo "$(3)"; \
72 fi; \
73 rm -f $$OUT)
74endef
Roman Zippel347a00f2006-12-10 02:18:41 -080075
Sam Ravnborg20a468b2006-01-22 13:34:15 +010076# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +010077# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
78as-option = $(call checker-shell,\
79 $(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o $$OUT,$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010080
Andi Kleene2414912006-09-26 10:52:30 +020081# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +010082# Usage: cflags-y += $(call as-instr,instr,option1,option2)
83as-instr = $(call checker-shell,\
84 printf "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o $$OUT -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +020085
Sam Ravnborg20a468b2006-01-22 13:34:15 +010086# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +010087# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
88cc-option = $(call checker-shell,\
89 $(CC) $(CFLAGS) $(if $(3),$(3),$(1)) -S -xc /dev/null -o $$OUT,$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010090
91# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +010092# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
93cc-option-yn = $(call cc-option,"y","n",$(1))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010094
95# cc-option-align
96# Prefix align with either -falign or -malign
97cc-option-align = $(subst -functions=0,,\
Oleg Verych5de043f2007-02-06 02:18:21 +010098 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010099
100# cc-version
Oleg Verychbff288c2007-02-07 23:04:35 +0100101# Usage gcc-ver := $(call cc-version,$(CC))
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200102cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100103
104# cc-ifversion
105# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100106cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100107
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700108# ld-option
109# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
Oleg Verychbff288c2007-02-07 23:04:35 +0100110ld-option = $(call checker-shell,\
111 $(CC) $(1) -nostdlib -xc /dev/null -o $$OUT,$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700112
Oleg Verych5de043f2007-02-06 02:18:21 +0100113######
114
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000115# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
116# Usage:
117# $(Q)$(MAKE) $(build)=dir
118build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
119
Oleg Verych5de043f2007-02-06 02:18:21 +0100120# Prefix -I with $(srctree) if it is not an absolute path,
121# add original to the end
122addtree = $(if \
Oleg Verychbff288c2007-02-07 23:04:35 +0100123 $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200124
Oleg Verych5de043f2007-02-06 02:18:21 +0100125# Find all -I options and call addtree
Oleg Verychbff288c2007-02-07 23:04:35 +0100126flags = $(foreach o,$($(1)),\
127 $(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100128
129# echo command.
130# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100131echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100132 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
133
134# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100135cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000136
Oleg Verych5de043f2007-02-06 02:18:21 +0100137# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100138objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200139
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000140###
Oleg Verych5de043f2007-02-06 02:18:21 +0100141# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000142# target, or command line has changed
143# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
144# including used config symbols
145# if_changed_rule - as if_changed but execute rule instead
146# See Documentation/kbuild/makefiles.txt for more info
147
148ifneq ($(KBUILD_NOCMDDEP),1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100149# Check if both arguments has same arguments. Result is empty string, if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000150# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200151arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
152 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000153endif
154
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200155# >'< substitution is for echo to work,
156# >$< substitution to preserve $ when reloading .cmd file
157# note: when using inline perl scripts [perl -e '...$$t=1;...']
158# in $(cmd_xxx) double $$ your perl vars
Jan Beulich6176aa92006-01-30 10:04:27 +0100159make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
160
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200161# Find any prerequisites that is newer than target or that does not exist.
162# PHONY targets skipped in both cases.
163any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
164
Oleg Verych5de043f2007-02-06 02:18:21 +0100165# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500166#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200167if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
168 @set -e; \
169 $(echo-cmd) $(cmd_$(1)); \
170 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000171
Oleg Verych5de043f2007-02-06 02:18:21 +0100172# Execute the command and also postprocess generated .d dependencies file.
173#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200174if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
175 @set -e; \
176 $(echo-cmd) $(cmd_$(1)); \
177 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
178 rm -f $(depfile); \
179 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000180
Oleg Verych5de043f2007-02-06 02:18:21 +0100181# Will check if $(cmd_foo) changed, or any of the prerequisites changed,
182# and if so will execute $(rule_foo).
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000183# Usage: $(call if_changed_rule,foo)
Oleg Verych5de043f2007-02-06 02:18:21 +0100184#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200185if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
186 @set -e; \
187 $(rule_$(1)))
188
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200189###
190# why - tell why a a target got build
191# enabled by make V=2
192# Output (listed in the order they are checked):
193# (1) - due to target is PHONY
194# (2) - due to target missing
195# (3) - due to: file1.h file2.h
196# (4) - due to command line change
197# (5) - due to missing .cmd file
198# (6) - due to target not in $(targets)
199# (1) PHONY targets are always build
200# (2) No target, so we better build it
201# (3) Prerequisite is newer than target
202# (4) The command line stored in the file named dir/.target.cmd
203# differed from actual command line. This happens when compiler
204# options changes
205# (5) No dir/.target.cmd file (used to store command line)
206# (6) No dir/.target.cmd file and target not listed in $(targets)
207# This is a good hint that there is a bug in the kbuild file
208ifeq ($(KBUILD_VERBOSE),2)
209why = \
210 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
211 $(if $(wildcard $@), \
212 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
213 $(if $(arg-check), \
214 $(if $(cmd_$@),- due to command line change, \
215 $(if $(filter $@, $(targets)), \
216 - due to missing .cmd file, \
217 - due to $(notdir $@) not in $$(targets) \
218 ) \
219 ) \
220 ) \
221 ), \
222 - due to target missing \
223 ) \
224 )
225
226echo-why = $(call escsq, $(strip $(why)))
227endif