1 # SPDX-License-Identifier: GPL-2.0 <<
2 #### 1 ####
3 # kbuild: Generic definitions 2 # kbuild: Generic definitions
4 3
5 # Convenient variables 4 # Convenient variables
6 comma := , 5 comma := ,
7 quote := " 6 quote := "
8 squote := ' 7 squote := '
9 empty := 8 empty :=
10 space := $(empty) $(empty) 9 space := $(empty) $(empty)
11 space_escape := _-_SPACE_-_ 10 space_escape := _-_SPACE_-_
12 pound := \# !! 11 right_paren := )
13 define newline !! 12 left_paren := (
14 <<
15 <<
16 endef <<
17 <<
18 ### <<
19 # Comparison macros. <<
20 # Usage: $(call test-lt, $(CONFIG_LLD_VERSION) <<
21 # <<
22 # Use $(intcmp ...) if supported. (Make >= 4.4 <<
23 # Otherwise, fall back to the 'test' shell com <<
24 ifeq ($(intcmp 1,0,,,y),y) <<
25 test-ge = $(intcmp $(strip $1)0, $(strip $2)0, <<
26 test-gt = $(intcmp $(strip $1)0, $(strip $2)0, <<
27 else <<
28 test-ge = $(shell test $(strip $1)0 -ge $(stri <<
29 test-gt = $(shell test $(strip $1)0 -gt $(stri <<
30 endif <<
31 test-le = $(call test-ge, $2, $1) <<
32 test-lt = $(call test-gt, $2, $1) <<
33 13
34 ### 14 ###
35 # Name of target with a '.' as filename prefix 15 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
36 dot-target = $(dir $@).$(notdir $@) 16 dot-target = $(dir $@).$(notdir $@)
37 17
38 ### 18 ###
39 # Name of target with a '.tmp_' as filename pr !! 19 # The temporary file to save gcc -MD generated dependencies must not
40 tmp-target = $(dir $@).tmp_$(notdir $@) <<
41 <<
42 ### <<
43 # The temporary file to save gcc -MMD generate <<
44 # contain a comma 20 # contain a comma
45 depfile = $(subst $(comma),_,$(dot-target).d) 21 depfile = $(subst $(comma),_,$(dot-target).d)
46 22
47 ### 23 ###
48 # filename of target with directory and extens 24 # filename of target with directory and extension stripped
49 basetarget = $(basename $(notdir $@)) 25 basetarget = $(basename $(notdir $@))
50 26
51 ### 27 ###
52 # real prerequisites without phony targets !! 28 # filename of first prerequisite with directory and extension stripped
53 real-prereqs = $(filter-out $(PHONY), $^) !! 29 baseprereq = $(basename $(notdir $<))
54 30
55 ### 31 ###
56 # Escape single quote for use in echo statemen 32 # Escape single quote for use in echo statements
57 escsq = $(subst $(squote),'\$(squote)',$1) 33 escsq = $(subst $(squote),'\$(squote)',$1)
58 34
59 ### 35 ###
60 # Quote a string to pass it to C files. foo => <<
61 stringify = $(squote)$(quote)$1$(quote)$(squot <<
62 <<
63 ### <<
64 # The path to Kbuild or Makefile. Kbuild has p <<
65 kbuild-file = $(or $(wildcard $(src)/Kbuild),$ <<
66 <<
67 ### <<
68 # Read a file, replacing newlines with spaces <<
69 # <<
70 # Make 4.2 or later can read a file by using i <<
71 ifneq ($(filter-out 4.0 4.1, $(MAKE_VERSION)), <<
72 read-file = $(subst $(newline),$(space),$(file <<
73 else <<
74 read-file = $(shell cat $1 2>/dev/null) <<
75 endif <<
76 <<
77 ### <<
78 # Easy method for doing a status message 36 # Easy method for doing a status message
79 kecho := : 37 kecho := :
80 quiet_kecho := echo 38 quiet_kecho := echo
81 silent_kecho := : 39 silent_kecho := :
82 kecho := $($(quiet)kecho) 40 kecho := $($(quiet)kecho)
83 41
84 ### 42 ###
85 # filechk is used to check if the content of a 43 # filechk is used to check if the content of a generated file is updated.
86 # Sample usage: 44 # Sample usage:
87 # !! 45 # define filechk_sample
88 # filechk_sample = echo $(KERNELRELEASE) !! 46 # echo $KERNELRELEASE
89 # version.h: FORCE !! 47 # endef
>> 48 # version.h : Makefile
90 # $(call filechk,sample) 49 # $(call filechk,sample)
91 # <<
92 # The rule defined shall write to stdout the c 50 # The rule defined shall write to stdout the content of the new file.
93 # The existing file will be compared with the 51 # The existing file will be compared with the new one.
94 # - If no file exist it is created 52 # - If no file exist it is created
95 # - If the content differ the new file is used 53 # - If the content differ the new file is used
96 # - If they are equal no change, and no timest 54 # - If they are equal no change, and no timestamp update
>> 55 # - stdin is piped in from the first prerequisite ($<) so one has
>> 56 # to specify a valid file as first prerequisite (often the kbuild file)
97 define filechk 57 define filechk
98 $(check-FORCE) !! 58 $(Q)set -e; \
99 $(Q)set -e; !! 59 $(kecho) ' CHK $@'; \
100 mkdir -p $(dir $@); !! 60 mkdir -p $(dir $@); \
101 trap "rm -f $(tmp-target)" EXIT; !! 61 $(filechk_$(1)) < $< > $@.tmp; \
102 { $(filechk_$(1)); } > $(tmp-target); !! 62 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
103 if [ ! -r $@ ] || ! cmp -s $@ $(tmp-ta !! 63 rm -f $@.tmp; \
104 $(kecho) ' UPD $@'; !! 64 else \
105 mv -f $(tmp-target) $@; !! 65 $(kecho) ' UPD $@'; \
>> 66 mv -f $@.tmp $@; \
106 fi 67 fi
107 endef 68 endef
108 69
>> 70 ######
>> 71 # gcc support functions
>> 72 # See documentation in Documentation/kbuild/makefiles.txt
>> 73
>> 74 # cc-cross-prefix
>> 75 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
>> 76 # Return first prefix where a prefix$(CC) is found in PATH.
>> 77 # If no $(CC) found in PATH with listed prefixes return nothing
>> 78 cc-cross-prefix = \
>> 79 $(word 1, $(foreach c,$(1), \
>> 80 $(shell set -e; \
>> 81 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
>> 82 echo $(c); \
>> 83 fi)))
>> 84
>> 85 # Tools for caching Makefile variables that are "expensive" to compute.
>> 86 #
>> 87 # Here we want to help deal with variables that take a long time to compute
>> 88 # by making it easy to store these variables in a cache.
>> 89 #
>> 90 # The canonical example here is testing for compiler flags. On a simple system
>> 91 # each call to the compiler takes 10 ms, but on a system with a compiler that's
>> 92 # called through various wrappers it can take upwards of 100 ms. If we have
>> 93 # 100 calls to the compiler this can take 1 second (on a simple system) or 10
>> 94 # seconds (on a complicated system).
>> 95 #
>> 96 # The "cache" will be in Makefile syntax and can be directly included.
>> 97 # Any time we try to reference a variable that's not in the cache we'll
>> 98 # calculate it and store it in the cache for next time.
>> 99
>> 100 # Include values from last time
>> 101 make-cache := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/,$(if $(obj),$(obj)/)).cache.mk
>> 102 $(make-cache): ;
>> 103 -include $(make-cache)
>> 104
>> 105 cached-data := $(filter __cached_%, $(.VARIABLES))
>> 106
>> 107 # If cache exceeds 1000 lines, shrink it down to 500.
>> 108 ifneq ($(word 1000,$(cached-data)),)
>> 109 $(shell tail -n 500 $(make-cache) > $(make-cache).tmp; \
>> 110 mv $(make-cache).tmp $(make-cache))
>> 111 endif
>> 112
>> 113 create-cache-dir := $(if $(KBUILD_SRC),$(if $(cache-data),,1))
>> 114
>> 115 # Usage: $(call __sanitize-opt,Hello=Hola$(comma)Goodbye Adios)
>> 116 #
>> 117 # Convert all '$', ')', '(', '\', '=', ' ', ',', ':' to '_'
>> 118 __sanitize-opt = $(subst $$,_,$(subst $(right_paren),_,$(subst $(left_paren),_,$(subst \,_,$(subst =,_,$(subst $(space),_,$(subst $(comma),_,$(subst :,_,$(1)))))))))
>> 119
>> 120 # Usage: $(call shell-cached,shell_command)
>> 121 # Example: $(call shell-cached,md5sum /usr/bin/gcc)
>> 122 #
>> 123 # If we've already seen a call to this exact shell command (even in a
>> 124 # previous invocation of make!) we'll return the value. If not, we'll
>> 125 # compute it and store the result for future runs.
>> 126 #
>> 127 # This is a bit of voodoo, but basic explanation is that if the variable
>> 128 # was undefined then we'll evaluate the shell command and store the result
>> 129 # into the variable. We'll then store that value in the cache and finally
>> 130 # output the value.
>> 131 #
>> 132 # NOTE: The $$(2) here isn't actually a parameter to __run-and-store. We
>> 133 # happen to know that the caller will have their shell command in $(2) so the
>> 134 # result of "call"ing this will produce a reference to that $(2). The reason
>> 135 # for this strangeness is to avoid an extra level of eval (and escaping) of
>> 136 # $(2).
>> 137 define __run-and-store
>> 138 ifeq ($(origin $(1)),undefined)
>> 139 $$(eval $(1) := $$(shell $$(2)))
>> 140 ifeq ($(create-cache-dir),1)
>> 141 $$(shell mkdir -p $(dir $(make-cache)))
>> 142 $$(eval create-cache-dir :=)
>> 143 endif
>> 144 $$(shell echo '$(1) := $$($(1))' >> $(make-cache))
>> 145 endif
>> 146 endef
>> 147 __shell-cached = $(eval $(call __run-and-store,$(1)))$($(1))
>> 148 shell-cached = $(call __shell-cached,__cached_$(call __sanitize-opt,$(1)),$(1))
>> 149
>> 150 # output directory for tests below
>> 151 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
>> 152
>> 153 # try-run
>> 154 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
>> 155 # Exit code chooses option. "$$TMP" serves as a temporary file and is
>> 156 # automatically cleaned up.
>> 157 __try-run = set -e; \
>> 158 TMP="$(TMPOUT).$$$$.tmp"; \
>> 159 TMPO="$(TMPOUT).$$$$.o"; \
>> 160 if ($(1)) >/dev/null 2>&1; \
>> 161 then echo "$(2)"; \
>> 162 else echo "$(3)"; \
>> 163 fi; \
>> 164 rm -f "$$TMP" "$$TMPO"
>> 165
>> 166 try-run = $(shell $(__try-run))
>> 167
>> 168 # try-run-cached
>> 169 # This works like try-run, but the result is cached.
>> 170 try-run-cached = $(call shell-cached,$(__try-run))
>> 171
>> 172 # as-option
>> 173 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
>> 174
>> 175 as-option = $(call try-run-cached,\
>> 176 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
>> 177
>> 178 # as-instr
>> 179 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
>> 180
>> 181 as-instr = $(call try-run-cached,\
>> 182 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
>> 183
>> 184 # __cc-option
>> 185 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
>> 186 __cc-option = $(call try-run-cached,\
>> 187 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
>> 188
>> 189 # Do not attempt to build with gcc plugins during cc-option tests.
>> 190 # (And this uses delayed resolution so the flags will be up to date.)
>> 191 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
>> 192
>> 193 # cc-option
>> 194 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
>> 195
>> 196 cc-option = $(call __cc-option, $(CC),\
>> 197 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
>> 198
>> 199 # hostcc-option
>> 200 # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
>> 201 hostcc-option = $(call __cc-option, $(HOSTCC),\
>> 202 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
>> 203
>> 204 # cc-option-yn
>> 205 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
>> 206 cc-option-yn = $(call try-run-cached,\
>> 207 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
>> 208
>> 209 # cc-disable-warning
>> 210 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
>> 211 cc-disable-warning = $(call try-run-cached,\
>> 212 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
>> 213
>> 214 # cc-name
>> 215 # Expands to either gcc or clang
>> 216 cc-name = $(call shell-cached,$(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
>> 217
>> 218 # cc-version
>> 219 cc-version = $(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
>> 220
>> 221 # cc-fullversion
>> 222 cc-fullversion = $(call shell-cached,$(CONFIG_SHELL) \
>> 223 $(srctree)/scripts/gcc-version.sh -p $(CC))
>> 224
>> 225 # cc-ifversion
>> 226 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
>> 227 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
>> 228
>> 229 # cc-if-fullversion
>> 230 # Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
>> 231 cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
>> 232
>> 233 # cc-ldoption
>> 234 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
>> 235 cc-ldoption = $(call try-run-cached,\
>> 236 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
>> 237
>> 238 # ld-option
>> 239 # Usage: LDFLAGS += $(call ld-option, -X)
>> 240 ld-option = $(call try-run-cached,\
>> 241 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -x c /dev/null -c -o "$$TMPO"; \
>> 242 $(LD) $(LDFLAGS) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
>> 243
>> 244 # ar-option
>> 245 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
>> 246 # Important: no spaces around options
>> 247 ar-option = $(call try-run-cached, $(AR) rc$(1) "$$TMP",$(1),$(2))
>> 248
>> 249 # ld-version
>> 250 # Note this is mainly for HJ Lu's 3 number binutil versions
>> 251 ld-version = $(call shell-cached,$(LD) --version | $(srctree)/scripts/ld-version.sh)
>> 252
>> 253 # ld-ifversion
>> 254 # Usage: $(call ld-ifversion, -ge, 22252, y)
>> 255 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
>> 256
>> 257 ######
>> 258
109 ### 259 ###
110 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 260 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
111 # Usage: 261 # Usage:
112 # $(Q)$(MAKE) $(build)=dir 262 # $(Q)$(MAKE) $(build)=dir
113 build := -f $(srctree)/scripts/Makefile.build 263 build := -f $(srctree)/scripts/Makefile.build obj
114 264
115 ### 265 ###
>> 266 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
>> 267 # Usage:
>> 268 # $(Q)$(MAKE) $(modbuiltin)=dir
>> 269 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
>> 270
>> 271 ###
>> 272 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
>> 273 # Usage:
>> 274 # $(Q)$(MAKE) $(dtbinst)=dir
>> 275 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
>> 276
>> 277 ###
116 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 278 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
117 # Usage: 279 # Usage:
118 # $(Q)$(MAKE) $(clean)=dir 280 # $(Q)$(MAKE) $(clean)=dir
119 clean := -f $(srctree)/scripts/Makefile.clean 281 clean := -f $(srctree)/scripts/Makefile.clean obj
120 282
121 # pring log !! 283 ###
122 # !! 284 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
123 # If quiet is "silent_", print nothing and sin !! 285 # Usage:
124 # If quiet is "quiet_", print short log !! 286 # $(Q)$(MAKE) $(hdr-inst)=dir
125 # If quiet is empty, print short log and whole !! 287 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
126 silent_log_print = exec >/dev/null; !! 288
127 quiet_log_print = $(if $(quiet_cmd_$1), echo !! 289 # Prefix -I with $(srctree) if it is not an absolute path.
128 log_print = echo '$(pound) $(call escsq !! 290 # skip if -I has no parameter
129 echo ' $(call escsq,$(cmd_ !! 291 addtree = $(if $(patsubst -I%,%,$(1)), \
130 !! 292 $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
131 # Delete the target on interruption !! 293
132 # !! 294 # Find all -I options and call addtree
133 # GNU Make automatically deletes the target if !! 295 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
134 # the interrupted recipe. So, you can safely s !! 296
135 # will delete incomplete targets), and resume !! 297 # echo command.
136 # !! 298 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
137 # However, this does not work when the stderr !! 299 echo-cmd = $(if $($(quiet)cmd_$(1)),\
138 # $ make >&2 | tee log !! 300 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
139 # Make dies with SIGPIPE before cleaning the t <<
140 # <<
141 # To address it, we clean the target in signal <<
142 # <<
143 # Make deletes the target when it catches SIGH <<
144 # So, we cover them, and also SIGPIPE just in <<
145 # <<
146 # Of course, this is unneeded for phony target <<
147 delete-on-interrupt = \ <<
148 $(if $(filter-out $(PHONY), $@), \ <<
149 $(foreach sig, HUP INT QUIT TE <<
150 trap 'rm -f $@; trap - <<
151 301
152 # print and execute commands !! 302 # printing commands
153 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_ !! 303 cmd = @$(echo-cmd) $(cmd_$(1))
>> 304
>> 305 # Add $(obj)/ for paths that are not absolute
>> 306 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
154 307
155 ### 308 ###
156 # if_changed - execute command if any pre 309 # if_changed - execute command if any prerequisite is newer than
157 # target, or command line ha 310 # target, or command line has changed
158 # if_changed_dep - as if_changed, but uses fi 311 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
159 # including used config symb 312 # including used config symbols
160 # if_changed_rule - as if_changed but execute 313 # if_changed_rule - as if_changed but execute rule instead
161 # See Documentation/kbuild/makefiles.rst for m !! 314 # See Documentation/kbuild/makefiles.txt for more info
162 315
163 ifneq ($(KBUILD_NOCMDDEP),1) 316 ifneq ($(KBUILD_NOCMDDEP),1)
164 # Check if both commands are the same includin !! 317 # Check if both arguments are the same including their order. Result is empty
165 # string if equal. User may override this chec 318 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
166 # If the target does not exist, the *.cmd file !! 319 arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
167 # $(savedcmd_$@) gets empty. Then, target will <<
168 # happens to become empty. <<
169 cmd-check = $(filter-out $(subst $(space),$(sp <<
170 $(subst $(space),$(sp 320 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
171 else 321 else
172 # We still need to detect missing targets. !! 322 arg-check = $(if $(strip $(cmd_$@)),,1)
173 cmd-check = $(if $(strip $(savedcmd_$@)),,1) <<
174 endif 323 endif
175 324
176 # Replace >$< with >$$< to preserve $ when rel 325 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
177 # (needed for make) 326 # (needed for make)
178 # Replace >#< with >$(pound)< to avoid startin !! 327 # Replace >#< with >\#< to avoid starting a comment in the .cmd file
179 # (needed for make) 328 # (needed for make)
180 # Replace >'< with >'\''< to be able to enclos 329 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
181 # (needed for the shell) 330 # (needed for the shell)
182 make-cmd = $(call escsq,$(subst $(pound),$$(po !! 331 make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
183 332
184 # Find any prerequisites that are newer than t !! 333 # Find any prerequisites that is newer than target or that does not exist.
185 # PHONY targets skipped in both cases. 334 # PHONY targets skipped in both cases.
186 # If there is no prerequisite other than phony !! 335 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
187 # empty even if the target does not exist. cmd <<
188 newer-prereqs = $(filter-out $(PHONY),$?) <<
189 <<
190 # It is a typical mistake to forget the FORCE <<
191 # no more breakage will slip in. <<
192 check-FORCE = $(if $(filter FORCE, $^),,$(warn <<
193 <<
194 if-changed-cond = $(newer-prereqs)$(cmd-check) <<
195 336
196 # Execute command if command has changed or pr 337 # Execute command if command has changed or prerequisite(s) are updated.
197 if_changed = $(if $(if-changed-cond),$(cmd_and !! 338 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
198 !! 339 @set -e; \
199 cmd_and_savecmd = !! 340 $(echo-cmd) $(cmd_$(1)); \
200 $(cmd); !! 341 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
201 printf '%s\n' 'savedcmd_$@ := $(make-c <<
202 342
203 # Execute the command and also postprocess gen 343 # Execute the command and also postprocess generated .d dependencies file.
204 if_changed_dep = $(if $(if-changed-cond),$(cmd !! 344 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
>> 345 @set -e; \
>> 346 $(cmd_and_fixdep), @:)
>> 347
>> 348 ifndef CONFIG_TRIM_UNUSED_KSYMS
>> 349
>> 350 cmd_and_fixdep = \
>> 351 $(echo-cmd) $(cmd_$(1)); \
>> 352 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
>> 353 rm -f $(depfile); \
>> 354 mv -f $(dot-target).tmp $(dot-target).cmd;
>> 355
>> 356 else
>> 357
>> 358 # Filter out exported kernel symbol names from the preprocessor output.
>> 359 # See also __KSYM_DEPS__ in include/linux/export.h.
>> 360 # We disable the depfile generation here, so as not to overwrite the existing
>> 361 # depfile while fixdep is parsing it.
>> 362 flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
>> 363 ksym_dep_filter = \
>> 364 case "$(1)" in \
>> 365 cc_*_c|cpp_i_c) \
>> 366 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
>> 367 as_*_S|cpp_s_S) \
>> 368 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
>> 369 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
>> 370 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
>> 371 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
205 372
206 cmd_and_fixdep = 373 cmd_and_fixdep = \
207 $(cmd); !! 374 $(echo-cmd) $(cmd_$(1)); \
208 scripts/basic/fixdep $(depfile) $@ '$( !! 375 $(ksym_dep_filter) | \
209 rm -f $(depfile) !! 376 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
>> 377 > $(dot-target).tmp; \
>> 378 rm -f $(depfile); \
>> 379 mv -f $(dot-target).tmp $(dot-target).cmd;
>> 380
>> 381 endif
210 382
211 # Usage: $(call if_changed_rule,foo) 383 # Usage: $(call if_changed_rule,foo)
212 # Will check if $(cmd_foo) or any of the prere 384 # Will check if $(cmd_foo) or any of the prerequisites changed,
213 # and if so will execute $(rule_foo). 385 # and if so will execute $(rule_foo).
214 if_changed_rule = $(if $(if-changed-cond),$(ru !! 386 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
>> 387 @set -e; \
>> 388 $(rule_$(1)), @:)
215 389
216 ### 390 ###
217 # why - tell why a target got built 391 # why - tell why a target got built
218 # enabled by make V=2 392 # enabled by make V=2
219 # Output (listed in the order they are c 393 # Output (listed in the order they are checked):
220 # (1) - due to target is PHONY 394 # (1) - due to target is PHONY
221 # (2) - due to target missing 395 # (2) - due to target missing
222 # (3) - due to: file1.h file2.h 396 # (3) - due to: file1.h file2.h
223 # (4) - due to command line change 397 # (4) - due to command line change
224 # (5) - due to missing .cmd file 398 # (5) - due to missing .cmd file
225 # (6) - due to target not in $(target 399 # (6) - due to target not in $(targets)
226 # (1) PHONY targets are always build 400 # (1) PHONY targets are always build
227 # (2) No target, so we better build it 401 # (2) No target, so we better build it
228 # (3) Prerequisite is newer than target 402 # (3) Prerequisite is newer than target
229 # (4) The command line stored in the file name 403 # (4) The command line stored in the file named dir/.target.cmd
230 # differed from actual command line. This 404 # differed from actual command line. This happens when compiler
231 # options changes 405 # options changes
232 # (5) No dir/.target.cmd file (used to store c 406 # (5) No dir/.target.cmd file (used to store command line)
233 # (6) No dir/.target.cmd file and target not l 407 # (6) No dir/.target.cmd file and target not listed in $(targets)
234 # This is a good hint that there is a bug 408 # This is a good hint that there is a bug in the kbuild file
235 ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) !! 409 ifeq ($(KBUILD_VERBOSE),2)
236 _why = !! 410 why = \
237 $(if $(filter $@, $(PHONY)),- due to targe 411 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
238 $(if $(wildcard $@), 412 $(if $(wildcard $@), \
239 $(if $(newer-prereqs),- due to: $( !! 413 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
240 $(if $(cmd-check), !! 414 $(if $(arg-check), \
241 $(if $(savedcmd_$@),- due !! 415 $(if $(cmd_$@),- due to command line change, \
242 $(if $(filter $@, $(ta 416 $(if $(filter $@, $(targets)), \
243 - due to missing . 417 - due to missing .cmd file, \
244 - due to $(notdir 418 - due to $(notdir $@) not in $$(targets) \
245 ) 419 ) \
246 ) 420 ) \
247 ) 421 ) \
248 ), 422 ), \
249 - due to target missing 423 - due to target missing \
250 ) 424 ) \
251 ) 425 )
252 426
253 why = $(space)$(strip $(_why)) !! 427 echo-why = $(call escsq, $(strip $(why)))
254 endif 428 endif
255 429
256 ############################################## 430 ###############################################################################
257 <<
258 # delete partially updated (i.e. corrupted) fi <<
259 .DELETE_ON_ERROR: <<
260 <<
261 # do not delete intermediate files automatical <<
262 # 431 #
263 # .NOTINTERMEDIATE is more correct, but only a !! 432 # When a Kconfig string contains a filename, it is suitable for
264 # Make 4.4 introduced .NOTINTERMEDIATE, and it !! 433 # passing to shell commands. It is surrounded by double-quotes, and
265 # global .NOTINTERMEDIATE does not work. We ca !! 434 # any double-quotes or backslashes within it are escaped by
266 # Use .SECONDARY for older Make versions, but !! 435 # backslashes.
267 # deleted files. !! 436 #
268 ifneq ($(and $(filter notintermediate, $(.FEAT !! 437 # This is no use for dependencies or $(wildcard). We need to strip the
269 .NOTINTERMEDIATE: !! 438 # surrounding quotes and the escaping from quotes and backslashes, and
>> 439 # we *do* need to escape any spaces in the string. So, for example:
>> 440 #
>> 441 # Usage: $(eval $(call config_filename,FOO))
>> 442 #
>> 443 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
>> 444 # transformed as described above to be suitable for use within the
>> 445 # makefile.
>> 446 #
>> 447 # Also, if the filename is a relative filename and exists in the source
>> 448 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
>> 449 # be prefixed to *both* command invocation and dependencies.
>> 450 #
>> 451 # Note: We also print the filenames in the quiet_cmd_foo text, and
>> 452 # perhaps ought to have a version specially escaped for that purpose.
>> 453 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
>> 454 # enough. It'll strip the quotes in the common case where there's no
>> 455 # space and it's a simple filename, and it'll retain the quotes when
>> 456 # there's a space. There are some esoteric cases in which it'll print
>> 457 # the wrong thing, but we don't really care. The actual dependencies
>> 458 # and commands *do* get it right, with various combinations of single
>> 459 # and double quotes, backslashes and spaces in the filenames.
>> 460 #
>> 461 ###############################################################################
>> 462 #
>> 463 define config_filename
>> 464 ifneq ($$(CONFIG_$(1)),"")
>> 465 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
>> 466 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
270 else 467 else
271 .SECONDARY: !! 468 ifeq ($$(wildcard $$($(1)_FILENAME)),)
>> 469 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
>> 470 $(1)_SRCPREFIX := $(srctree)/
>> 471 endif
>> 472 endif
272 endif 473 endif
>> 474 endif
>> 475 endef
>> 476 #
>> 477 ###############################################################################
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