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Masahiro Yamada6e0a77f2014-02-04 17:24:17 +09001####
2# kbuild: Generic definitions
3
4# Convenient variables
5comma := ,
6squote := '
7empty :=
8space := $(empty) $(empty)
9
10###
11# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
12dot-target = $(dir $@).$(notdir $@)
13
14###
15# The temporary file to save gcc -MD generated dependencies must not
16# contain a comma
17depfile = $(subst $(comma),_,$(dot-target).d)
18
19###
20# filename of target with directory and extension stripped
21basetarget = $(basename $(notdir $@))
22
23###
24# filename of first prerequisite with directory and extension stripped
25baseprereq = $(basename $(notdir $<))
26
27###
28# Escape single quote for use in echo statements
29escsq = $(subst $(squote),'\$(squote)',$1)
30
31###
32# Easy method for doing a status message
33 kecho := :
34 quiet_kecho := echo
35silent_kecho := :
36kecho := $($(quiet)kecho)
37
38###
39# filechk is used to check if the content of a generated file is updated.
40# Sample usage:
41# define filechk_sample
42# echo $KERNELRELEASE
43# endef
44# version.h : Makefile
45# $(call filechk,sample)
46# The rule defined shall write to stdout the content of the new file.
47# The existing file will be compared with the new one.
48# - If no file exist it is created
49# - If the content differ the new file is used
50# - If they are equal no change, and no timestamp update
51# - stdin is piped in from the first prerequisite ($<) so one has
52# to specify a valid file as first prerequisite (often the kbuild file)
53define filechk
54 $(Q)set -e; \
55 $(kecho) ' CHK $@'; \
56 mkdir -p $(dir $@); \
57 $(filechk_$(1)) < $< > $@.tmp; \
58 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
59 rm -f $@.tmp; \
60 else \
61 $(kecho) ' UPD $@'; \
62 mv -f $@.tmp $@; \
63 fi
64endef
65
66######
67# gcc support functions
68# See documentation in Documentation/kbuild/makefiles.txt
69
70# cc-cross-prefix
71# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
72# Return first prefix where a prefix$(CC) is found in PATH.
73# If no $(CC) found in PATH with listed prefixes return nothing
74cc-cross-prefix = \
75 $(word 1, $(foreach c,$(1), \
76 $(shell set -e; \
77 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
78 echo $(c); \
79 fi)))
80
81# output directory for tests below
82TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
83
84# try-run
85# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
86# Exit code chooses option. "$$TMP" is can be used as temporary file and
87# is automatically cleaned up.
88try-run = $(shell set -e; \
89 TMP="$(TMPOUT).$$$$.tmp"; \
90 TMPO="$(TMPOUT).$$$$.o"; \
91 if ($(1)) >/dev/null 2>&1; \
92 then echo "$(2)"; \
93 else echo "$(3)"; \
94 fi; \
95 rm -f "$$TMP" "$$TMPO")
96
97# as-option
98# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
99
100as-option = $(call try-run,\
101 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
102
103# as-instr
104# Usage: cflags-y += $(call as-instr,instr,option1,option2)
105
106as-instr = $(call try-run,\
107 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
108
109# cc-option
110# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
111
112cc-option = $(call try-run,\
113 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
114
115# cc-option-yn
116# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
117cc-option-yn = $(call try-run,\
118 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
119
120# cc-option-align
121# Prefix align with either -falign or -malign
122cc-option-align = $(subst -functions=0,,\
123 $(call cc-option,-falign-functions=0,-malign-functions=0))
124
125# cc-disable-warning
126# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
127cc-disable-warning = $(call try-run,\
128 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
129
130# cc-version
131# Usage gcc-ver := $(call cc-version)
132cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
133
134# cc-fullversion
135# Usage gcc-ver := $(call cc-fullversion)
136cc-fullversion = $(shell $(CONFIG_SHELL) \
137 $(srctree)/scripts/gcc-version.sh -p $(CC))
138
139# cc-ifversion
140# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
141cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
142
Masahiro Yamada7449ab12014-02-04 17:24:18 +0900143# added for U-Boot
144binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
145dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC))
146
Masahiro Yamada6e0a77f2014-02-04 17:24:17 +0900147# cc-ldoption
148# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
149cc-ldoption = $(call try-run,\
150 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
151
152# ld-option
153# Usage: LDFLAGS += $(call ld-option, -X)
154ld-option = $(call try-run,\
155 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
156
157# ar-option
158# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
159# Important: no spaces around options
160ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
161
162######
163
164###
165# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
166# Usage:
167# $(Q)$(MAKE) $(build)=dir
Masahiro Yamada7449ab12014-02-04 17:24:18 +0900168#build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
169# temporary
170build := -f $(srctree)/scripts/Makefile.build -C
Masahiro Yamada6e0a77f2014-02-04 17:24:17 +0900171
172###
173# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
174# Usage:
175# $(Q)$(MAKE) $(modbuiltin)=dir
176modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
177
178# Prefix -I with $(srctree) if it is not an absolute path.
179# skip if -I has no parameter
180addtree = $(if $(patsubst -I%,%,$(1)), \
181$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
182
183# Find all -I options and call addtree
184flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
185
186# echo command.
187# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
188echo-cmd = $(if $($(quiet)cmd_$(1)),\
189 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
190
191# printing commands
192cmd = @$(echo-cmd) $(cmd_$(1))
193
194# Add $(obj)/ for paths that are not absolute
195objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
196
197###
198# if_changed - execute command if any prerequisite is newer than
199# target, or command line has changed
200# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
201# including used config symbols
202# if_changed_rule - as if_changed but execute rule instead
203# See Documentation/kbuild/makefiles.txt for more info
204
205ifneq ($(KBUILD_NOCMDDEP),1)
206# Check if both arguments has same arguments. Result is empty string if equal.
207# User may override this check using make KBUILD_NOCMDDEP=1
208arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
209 $(filter-out $(cmd_$@), $(cmd_$(1))) )
210else
211arg-check = $(if $(strip $(cmd_$@)),,1)
212endif
213
214# >'< substitution is for echo to work,
215# >$< substitution to preserve $ when reloading .cmd file
216# note: when using inline perl scripts [perl -e '...$$t=1;...']
217# in $(cmd_xxx) double $$ your perl vars
218make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))))
219
220# Find any prerequisites that is newer than target or that does not exist.
221# PHONY targets skipped in both cases.
222any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
223
224# Execute command if command has changed or prerequisite(s) are updated.
225#
226if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
227 @set -e; \
228 $(echo-cmd) $(cmd_$(1)); \
229 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
230
231# Execute the command and also postprocess generated .d dependencies file.
232if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
233 @set -e; \
234 $(echo-cmd) $(cmd_$(1)); \
235 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
236 rm -f $(depfile); \
237 mv -f $(dot-target).tmp $(dot-target).cmd)
238
239# Usage: $(call if_changed_rule,foo)
240# Will check if $(cmd_foo) or any of the prerequisites changed,
241# and if so will execute $(rule_foo).
242if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
243 @set -e; \
244 $(rule_$(1)))
245
246###
247# why - tell why a a target got build
248# enabled by make V=2
249# Output (listed in the order they are checked):
250# (1) - due to target is PHONY
251# (2) - due to target missing
252# (3) - due to: file1.h file2.h
253# (4) - due to command line change
254# (5) - due to missing .cmd file
255# (6) - due to target not in $(targets)
256# (1) PHONY targets are always build
257# (2) No target, so we better build it
258# (3) Prerequisite is newer than target
259# (4) The command line stored in the file named dir/.target.cmd
260# differed from actual command line. This happens when compiler
261# options changes
262# (5) No dir/.target.cmd file (used to store command line)
263# (6) No dir/.target.cmd file and target not listed in $(targets)
264# This is a good hint that there is a bug in the kbuild file
265ifeq ($(KBUILD_VERBOSE),2)
266why = \
267 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
268 $(if $(wildcard $@), \
269 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
270 $(if $(arg-check), \
271 $(if $(cmd_$@),- due to command line change, \
272 $(if $(filter $@, $(targets)), \
273 - due to missing .cmd file, \
274 - due to $(notdir $@) not in $$(targets) \
275 ) \
276 ) \
277 ) \
278 ), \
279 - due to target missing \
280 ) \
281 )
282
283echo-why = $(call escsq, $(strip $(why)))
284endif