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1 ####
2 # kbuild: Generic definitions
3
4 # Convenient variables
5 comma := ,
6 squote := '
7 empty :=
8 space := $(empty) $(empty)
9
10 ###
11 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
12 dot-target = $(dir $@).$(notdir $@)
13
14 ###
15 # The temporary file to save gcc -MD generated dependencies must not
16 # contain a comma
17 depfile = $(subst $(comma),_,$(dot-target).d)
18
19 ###
20 # filename of target with directory and extension stripped
21 basetarget = $(basename $(notdir $@))
22
23 ###
24 # filename of first prerequisite with directory and extension stripped
25 baseprereq = $(basename $(notdir $<))
26
27 ###
28 # Escape single quote for use in echo statements
29 escsq = $(subst $(squote),'\$(squote)',$1)
30
31 ###
32 # Easy method for doing a status message
33 kecho := :
34 quiet_kecho := echo
35 silent_kecho := :
36 kecho := $($(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)
53 define 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
64 endef
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
74 cc-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
82 TMPOUT := $(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.
88 try-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" "$$TMPO")
96
97 # as-option
98 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
99
100 as-option = $(call try-run,\
101 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
102
103 # as-instr
104 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
105
106 as-instr = $(call try-run,\
107 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
108
109 # cc-option
110 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
111
112 cc-option = $(call try-run,\
113 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
114
115 # cc-option-yn
116 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
117 cc-option-yn = $(call try-run,\
118 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
119
120 # cc-option-align
121 # Prefix align with either -falign or -malign
122 cc-option-align = $(subst -functions=0,,\
123 $(call cc-option,-falign-functions=0,-malign-functions=0))
124
125 # cc-disable-warning
126 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
127 cc-disable-warning = $(call try-run,\
128 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
129
130 # cc-version
131 # Usage gcc-ver := $(call cc-version)
132 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
133
134 # cc-fullversion
135 # Usage gcc-ver := $(call cc-fullversion)
136 cc-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)
141 cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
142
143 # cc-ldoption
144 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
145 cc-ldoption = $(call try-run,\
146 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
147
148 # ld-option
149 # Usage: LDFLAGS += $(call ld-option, -X)
150 ld-option = $(call try-run,\
151 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
152
153 # ar-option
154 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
155 # Important: no spaces around options
156 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
157
158 ######
159
160 ###
161 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
162 # Usage:
163 # $(Q)$(MAKE) $(build)=dir
164 build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
165
166 ###
167 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
168 # Usage:
169 # $(Q)$(MAKE) $(modbuiltin)=dir
170 modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
171
172 # Prefix -I with $(srctree) if it is not an absolute path.
173 # skip if -I has no parameter
174 addtree = $(if $(patsubst -I%,%,$(1)), \
175 $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
176
177 # Find all -I options and call addtree
178 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
179
180 # echo command.
181 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
182 echo-cmd = $(if $($(quiet)cmd_$(1)),\
183 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
184
185 # printing commands
186 cmd = @$(echo-cmd) $(cmd_$(1))
187
188 # Add $(obj)/ for paths that are not absolute
189 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
190
191 ###
192 # if_changed - execute command if any prerequisite is newer than
193 # target, or command line has changed
194 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
195 # including used config symbols
196 # if_changed_rule - as if_changed but execute rule instead
197 # See Documentation/kbuild/makefiles.txt for more info
198
199 ifneq ($(KBUILD_NOCMDDEP),1)
200 # Check if both arguments has same arguments. Result is empty string if equal.
201 # User may override this check using make KBUILD_NOCMDDEP=1
202 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
203 $(filter-out $(cmd_$@), $(cmd_$(1))) )
204 else
205 arg-check = $(if $(strip $(cmd_$@)),,1)
206 endif
207
208 # >'< substitution is for echo to work,
209 # >$< substitution to preserve $ when reloading .cmd file
210 # note: when using inline perl scripts [perl -e '...$$t=1;...']
211 # in $(cmd_xxx) double $$ your perl vars
212 make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))))
213
214 # Find any prerequisites that is newer than target or that does not exist.
215 # PHONY targets skipped in both cases.
216 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
217
218 # Execute command if command has changed or prerequisite(s) are updated.
219 #
220 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
221 @set -e; \
222 $(echo-cmd) $(cmd_$(1)); \
223 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
224
225 # Execute the command and also postprocess generated .d dependencies file.
226 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
227 @set -e; \
228 $(echo-cmd) $(cmd_$(1)); \
229 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
230 rm -f $(depfile); \
231 mv -f $(dot-target).tmp $(dot-target).cmd)
232
233 # Usage: $(call if_changed_rule,foo)
234 # Will check if $(cmd_foo) or any of the prerequisites changed,
235 # and if so will execute $(rule_foo).
236 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
237 @set -e; \
238 $(rule_$(1)))
239
240 ###
241 # why - tell why a a target got build
242 # enabled by make V=2
243 # Output (listed in the order they are checked):
244 # (1) - due to target is PHONY
245 # (2) - due to target missing
246 # (3) - due to: file1.h file2.h
247 # (4) - due to command line change
248 # (5) - due to missing .cmd file
249 # (6) - due to target not in $(targets)
250 # (1) PHONY targets are always build
251 # (2) No target, so we better build it
252 # (3) Prerequisite is newer than target
253 # (4) The command line stored in the file named dir/.target.cmd
254 # differed from actual command line. This happens when compiler
255 # options changes
256 # (5) No dir/.target.cmd file (used to store command line)
257 # (6) No dir/.target.cmd file and target not listed in $(targets)
258 # This is a good hint that there is a bug in the kbuild file
259 ifeq ($(KBUILD_VERBOSE),2)
260 why = \
261 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
262 $(if $(wildcard $@), \
263 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
264 $(if $(arg-check), \
265 $(if $(cmd_$@),- due to command line change, \
266 $(if $(filter $@, $(targets)), \
267 - due to missing .cmd file, \
268 - due to $(notdir $@) not in $$(targets) \
269 ) \
270 ) \
271 ) \
272 ), \
273 - due to target missing \
274 ) \
275 )
276
277 echo-why = $(call escsq, $(strip $(why)))
278 endif