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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)
Sam Ravnborgfab1e312008-02-11 14:26:26 +010042 chk_filechk = :
Mike Frysingerd75f4c62008-02-08 00:05:52 -050043 quiet_chk_filechk = echo ' CHK $@'
44silent_chk_filechk = :
Sam Ravnborgfab1e312008-02-11 14:26:26 +010045 upd_filechk = :
Mike Frysingerd75f4c62008-02-08 00:05:52 -050046 quiet_upd_filechk = echo ' UPD $@'
47silent_upd_filechk = :
Sam Ravnborgfab1e312008-02-11 14:26:26 +010048
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +000049define filechk
50 $(Q)set -e; \
Mike Frysingerd75f4c62008-02-08 00:05:52 -050051 $($(quiet)chk_filechk); \
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 Frysingerd75f4c62008-02-08 00:05:52 -050057 $($(quiet)upd_filechk); \
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).$$$$.tmp"; \
86 if ($(1)) >/dev/null 2>&1; \
87 then echo "$(2)"; \
88 else echo "$(3)"; \
89 fi; \
90 rm -f "$$TMP")
Roman Zippel347a00f2006-12-10 02:18:41 -080091
Sam Ravnborg20a468b2006-01-22 13:34:15 +010092# as-option
Oleg Verychbff288c2007-02-07 23:04:35 +010093# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
Roman Zippelbeda9f32007-02-08 22:48:51 +010094
95as-option = $(call try-run,\
Sam Ravnborga0f97e02007-10-14 22:21:35 +020096 $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +010097
Andi Kleene2414912006-09-26 10:52:30 +020098# as-instr
Oleg Verychbff288c2007-02-07 23:04:35 +010099# Usage: cflags-y += $(call as-instr,instr,option1,option2)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100100
101as-instr = $(call try-run,\
Sam Ravnborg222d3942007-10-15 21:59:31 +0200102 echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3))
Andi Kleene2414912006-09-26 10:52:30 +0200103
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100104# cc-option
Oleg Verychbff288c2007-02-07 23:04:35 +0100105# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100106
107cc-option = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700108 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100109
110# cc-option-yn
Oleg Verychbff288c2007-02-07 23:04:35 +0100111# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100112cc-option-yn = $(call try-run,\
H. Peter Anvin43789e22008-09-08 14:43:11 -0700113 $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100114
115# cc-option-align
116# Prefix align with either -falign or -malign
117cc-option-align = $(subst -functions=0,,\
Roman Zippelbeda9f32007-02-08 22:48:51 +0100118 $(call cc-option,-falign-functions=0,-malign-functions=0))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100119
120# cc-version
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200121# Usage gcc-ver := $(call cc-version)
Sam Ravnborg8eb3afe2006-07-23 19:49:45 +0200122cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100123
Segher Boessenkool0ab2a272007-05-19 18:49:07 +0200124# cc-fullversion
125# Usage gcc-ver := $(call cc-fullversion)
126cc-fullversion = $(shell $(CONFIG_SHELL) \
127 $(srctree)/scripts/gcc-version.sh -p $(CC))
128
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100129# cc-ifversion
130# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
Oleg Verych5de043f2007-02-06 02:18:21 +0100131cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
Sam Ravnborg20a468b2006-01-22 13:34:15 +0100132
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700133# ld-option
134# Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100135ld-option = $(call try-run,\
136 $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2))
Roland McGrath0b0bf7a2006-07-30 03:04:06 -0700137
Oleg Verych5de043f2007-02-06 02:18:21 +0100138######
139
Roman Zippelbeda9f32007-02-08 22:48:51 +0100140###
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000141# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
142# Usage:
143# $(Q)$(MAKE) $(build)=dir
144build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
145
Roman Zippelbeda9f32007-02-08 22:48:51 +0100146# Prefix -I with $(srctree) if it is not an absolute path.
147addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
Sam Ravnborgd9df92e2006-04-07 08:36:49 +0200148
Oleg Verych5de043f2007-02-06 02:18:21 +0100149# Find all -I options and call addtree
Roman Zippelbeda9f32007-02-08 22:48:51 +0100150flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
Oleg Verych5de043f2007-02-06 02:18:21 +0100151
152# echo command.
153# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
Oleg Verychbff288c2007-02-07 23:04:35 +0100154echo-cmd = $(if $($(quiet)cmd_$(1)),\
Oleg Verych5de043f2007-02-06 02:18:21 +0100155 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
156
157# printing commands
Jan Beulich6176aa92006-01-30 10:04:27 +0100158cmd = @$(echo-cmd) $(cmd_$(1))
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000159
Oleg Verych5de043f2007-02-06 02:18:21 +0100160# Add $(obj)/ for paths that are not absolute
Oleg Verychbff288c2007-02-07 23:04:35 +0100161objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
Sam Ravnborg0a504f22005-09-10 21:02:11 +0200162
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000163###
Oleg Verych5de043f2007-02-06 02:18:21 +0100164# if_changed - execute command if any prerequisite is newer than
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000165# target, or command line has changed
166# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
167# including used config symbols
168# if_changed_rule - as if_changed but execute rule instead
169# See Documentation/kbuild/makefiles.txt for more info
170
171ifneq ($(KBUILD_NOCMDDEP),1)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100172# Check if both arguments has same arguments. Result is empty string if equal.
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000173# User may override this check using make KBUILD_NOCMDDEP=1
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200174arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
175 $(filter-out $(cmd_$@), $(cmd_$(1))) )
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000176endif
177
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200178# >'< substitution is for echo to work,
179# >$< substitution to preserve $ when reloading .cmd file
180# note: when using inline perl scripts [perl -e '...$$t=1;...']
181# in $(cmd_xxx) double $$ your perl vars
Jan Beulich6176aa92006-01-30 10:04:27 +0100182make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))
183
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200184# Find any prerequisites that is newer than target or that does not exist.
185# PHONY targets skipped in both cases.
186any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
187
Oleg Verych5de043f2007-02-06 02:18:21 +0100188# Execute command if command has changed or prerequisite(s) are updated.
Paul Smith4f193362006-03-05 17:14:10 -0500189#
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200190if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
191 @set -e; \
192 $(echo-cmd) $(cmd_$(1)); \
193 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000194
Oleg Verych5de043f2007-02-06 02:18:21 +0100195# Execute the command and also postprocess generated .d dependencies file.
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200196if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
197 @set -e; \
198 $(echo-cmd) $(cmd_$(1)); \
199 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
200 rm -f $(depfile); \
201 mv -f $(dot-target).tmp $(dot-target).cmd)
Sam Ravnborg8ec4b4f2005-07-25 20:10:36 +0000202
203# Usage: $(call if_changed_rule,foo)
Roman Zippelbeda9f32007-02-08 22:48:51 +0100204# Will check if $(cmd_foo) or any of the prerequisites changed,
205# and if so will execute $(rule_foo).
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200206if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
207 @set -e; \
208 $(rule_$(1)))
209
Sam Ravnborg45d506b2006-08-08 21:35:14 +0200210###
211# why - tell why a a target got build
212# enabled by make V=2
213# Output (listed in the order they are checked):
214# (1) - due to target is PHONY
215# (2) - due to target missing
216# (3) - due to: file1.h file2.h
217# (4) - due to command line change
218# (5) - due to missing .cmd file
219# (6) - due to target not in $(targets)
220# (1) PHONY targets are always build
221# (2) No target, so we better build it
222# (3) Prerequisite is newer than target
223# (4) The command line stored in the file named dir/.target.cmd
224# differed from actual command line. This happens when compiler
225# options changes
226# (5) No dir/.target.cmd file (used to store command line)
227# (6) No dir/.target.cmd file and target not listed in $(targets)
228# This is a good hint that there is a bug in the kbuild file
229ifeq ($(KBUILD_VERBOSE),2)
230why = \
231 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
232 $(if $(wildcard $@), \
233 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
234 $(if $(arg-check), \
235 $(if $(cmd_$@),- due to command line change, \
236 $(if $(filter $@, $(targets)), \
237 - due to missing .cmd file, \
238 - due to $(notdir $@) not in $$(targets) \
239 ) \
240 ) \
241 ) \
242 ), \
243 - due to target missing \
244 ) \
245 )
246
247echo-why = $(call escsq, $(strip $(why)))
248endif