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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###
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
Roman Zippelbeda9f32007-02-08 22:48:51 +010059# output directory for tests below
60TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
61
62# try-run
63# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
64# Exit code chooses option. "$$TMP" is can be used as temporary file and
65# is automatically cleaned up.
66try-run = $(shell set -e; \
67 TMP="$(TMPOUT).$$$$.tmp"; \
68 if ($(1)) >/dev/null 2>&1; \
69 then echo "$(2)"; \
70 else echo "$(3)"; \
71 fi; \
72 rm -f "$$TMP")
Roman Zippel347a00f2006-12-10 02:18:41 -080073
Sam Ravnborg20a468b2006-01-22 13:34:15 +010074# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +010075# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +010076
77as-option = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +020078 $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010079
Andi Kleene2414912006-09-26 10:52:30 +020080# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +010081# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +010082
83as-instr = $(call try-run,\
Sam Ravnborg222d3942007-10-15 21:59:31 +020084 echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(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)
Roman Zippelbeda9f32007-02-08 22:48:51 +010088
89cc-option = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +020090 $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010091
92# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +010093# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Roman Zippelbeda9f32007-02-08 22:48:51 +010094cc-option-yn = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +020095 $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +010096
97# cc-option-align
98# Prefix align with either -falign or -malign
99cc-option-align = $(subst -functions=0,,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100100 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100101
102# cc-version
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200103# Usage gcc-ver := $(call cc-version)
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200104cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100105
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200106# cc-fullversion
107# Usage gcc-ver := $(call cc-fullversion)
108cc-fullversion = $(shell $(CONFIG_SHELL) \
109 $(srctree)/scripts/gcc-version.sh -p $(CC))
110
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100111# cc-ifversion
112# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100113cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100114
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700115# ld-option
116# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100117ld-option = $(call try-run,\
118 $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700119
Oleg Verych5de043f2007-02-06 02:18:21 +0100120######
121
Roman Zippelbeda9f32007-02-08 22:48:51 +0100122###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000123# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
124# Usage:
125# $(Q)$(MAKE) $(build)=dir
126build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
127
Roman Zippelbeda9f32007-02-08 22:48:51 +0100128# Prefix -I with $(srctree) if it is not an absolute path.
129addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200130
Oleg Verych5de043f2007-02-06 02:18:21 +0100131# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100132flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100133
134# echo command.
135# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100136echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100137 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
138
139# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100140cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000141
Oleg Verych5de043f2007-02-06 02:18:21 +0100142# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100143objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200144
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000145###
Oleg Verych5de043f2007-02-06 02:18:21 +0100146# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000147# target, or command line has changed
148# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
149# including used config symbols
150# if_changed_rule - as if_changed but execute rule instead
151# See Documentation/kbuild/makefiles.txt for more info
152
153ifneq ($(KBUILD_NOCMDDEP),1)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100154# Check if both arguments has same arguments. Result is empty string if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000155# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200156arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
157 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000158endif
159
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200160# >'< substitution is for echo to work,
161# >$< substitution to preserve $ when reloading .cmd file
162# note: when using inline perl scripts [perl -e '...$$t=1;...']
163# in $(cmd_xxx) double $$ your perl vars
Jan Beulich6176aa92006-01-30 10:04:27 +0100164make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
165
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200166# Find any prerequisites that is newer than target or that does not exist.
167# PHONY targets skipped in both cases.
168any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
169
Oleg Verych5de043f2007-02-06 02:18:21 +0100170# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500171#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200172if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
173 @set -e; \
174 $(echo-cmd) $(cmd_$(1)); \
175 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000176
Oleg Verych5de043f2007-02-06 02:18:21 +0100177# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200178if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
179 @set -e; \
180 $(echo-cmd) $(cmd_$(1)); \
181 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
182 rm -f $(depfile); \
183 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000184
185# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100186# Will check if $(cmd_foo) or any of the prerequisites changed,
187# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200188if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
189 @set -e; \
190 $(rule_$(1)))
191
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200192###
193# why - tell why a a target got build
194# enabled by make V=2
195# Output (listed in the order they are checked):
196# (1) - due to target is PHONY
197# (2) - due to target missing
198# (3) - due to: file1.h file2.h
199# (4) - due to command line change
200# (5) - due to missing .cmd file
201# (6) - due to target not in $(targets)
202# (1) PHONY targets are always build
203# (2) No target, so we better build it
204# (3) Prerequisite is newer than target
205# (4) The command line stored in the file named dir/.target.cmd
206# differed from actual command line. This happens when compiler
207# options changes
208# (5) No dir/.target.cmd file (used to store command line)
209# (6) No dir/.target.cmd file and target not listed in $(targets)
210# This is a good hint that there is a bug in the kbuild file
211ifeq ($(KBUILD_VERBOSE),2)
212why = \
213 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
214 $(if $(wildcard $@), \
215 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
216 $(if $(arg-check), \
217 $(if $(cmd_$@),- due to command line change, \
218 $(if $(filter $@, $(targets)), \
219 - due to missing .cmd file, \
220 - due to $(notdir $@) not in $$(targets) \
221 ) \
222 ) \
223 ) \
224 ), \
225 - due to target missing \
226 ) \
227 )
228
229echo-why = $(call escsq, $(strip $(why)))
230endif