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 pound := \#
13 define newline <<
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 12
34 ### 13 ###
35 # Name of target with a '.' as filename prefix 14 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
36 dot-target = $(dir $@).$(notdir $@) 15 dot-target = $(dir $@).$(notdir $@)
37 16
38 ### 17 ###
39 # Name of target with a '.tmp_' as filename pr !! 18 # 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 19 # contain a comma
45 depfile = $(subst $(comma),_,$(dot-target).d) 20 depfile = $(subst $(comma),_,$(dot-target).d)
46 21
47 ### 22 ###
48 # filename of target with directory and extens 23 # filename of target with directory and extension stripped
49 basetarget = $(basename $(notdir $@)) 24 basetarget = $(basename $(notdir $@))
50 25
51 ### 26 ###
52 # real prerequisites without phony targets 27 # real prerequisites without phony targets
53 real-prereqs = $(filter-out $(PHONY), $^) 28 real-prereqs = $(filter-out $(PHONY), $^)
54 29
55 ### 30 ###
56 # Escape single quote for use in echo statemen 31 # Escape single quote for use in echo statements
57 escsq = $(subst $(squote),'\$(squote)',$1) 32 escsq = $(subst $(squote),'\$(squote)',$1)
58 33
59 ### 34 ###
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 35 # Easy method for doing a status message
79 kecho := : 36 kecho := :
80 quiet_kecho := echo 37 quiet_kecho := echo
81 silent_kecho := : 38 silent_kecho := :
82 kecho := $($(quiet)kecho) 39 kecho := $($(quiet)kecho)
83 40
84 ### 41 ###
85 # filechk is used to check if the content of a 42 # filechk is used to check if the content of a generated file is updated.
86 # Sample usage: 43 # Sample usage:
87 # 44 #
88 # filechk_sample = echo $(KERNELRELEASE) 45 # filechk_sample = echo $(KERNELRELEASE)
89 # version.h: FORCE 46 # version.h: FORCE
90 # $(call filechk,sample) 47 # $(call filechk,sample)
91 # 48 #
92 # The rule defined shall write to stdout the c 49 # The rule defined shall write to stdout the content of the new file.
93 # The existing file will be compared with the 50 # The existing file will be compared with the new one.
94 # - If no file exist it is created 51 # - If no file exist it is created
95 # - If the content differ the new file is used 52 # - If the content differ the new file is used
96 # - If they are equal no change, and no timest 53 # - If they are equal no change, and no timestamp update
>> 54 # - stdin is piped in from the first prerequisite ($<) so one has
>> 55 # to specify a valid file as first prerequisite (often the kbuild file)
97 define filechk 56 define filechk
98 $(check-FORCE) !! 57 $(Q)set -e; \
99 $(Q)set -e; !! 58 mkdir -p $(dir $@); \
100 mkdir -p $(dir $@); !! 59 { $(filechk_$(1)); } > $@.tmp; \
101 trap "rm -f $(tmp-target)" EXIT; !! 60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
102 { $(filechk_$(1)); } > $(tmp-target); !! 61 rm -f $@.tmp; \
103 if [ ! -r $@ ] || ! cmp -s $@ $(tmp-ta !! 62 else \
104 $(kecho) ' UPD $@'; !! 63 $(kecho) ' UPD $@'; \
105 mv -f $(tmp-target) $@; !! 64 mv -f $@.tmp $@; \
106 fi 65 fi
107 endef 66 endef
108 67
>> 68 ######
>> 69 # gcc support functions
>> 70 # See documentation in Documentation/kbuild/makefiles.txt
>> 71
>> 72 # cc-cross-prefix
>> 73 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
>> 74 # Return first <prefix> where a <prefix>gcc is found in PATH.
>> 75 # If no gcc found in PATH with listed prefixes return nothing
>> 76 #
>> 77 # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
>> 78 # would try to directly execute the shell builtin 'command'. This workaround
>> 79 # should be kept for a long time since this issue was fixed only after the
>> 80 # GNU Make 4.2.1 release.
>> 81 cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \
>> 82 $(if $(shell command -v $(c)gcc 2>/dev/null), $(c))))
>> 83
>> 84 # output directory for tests below
>> 85 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
>> 86
>> 87 # try-run
>> 88 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
>> 89 # Exit code chooses option. "$$TMP" serves as a temporary file and is
>> 90 # automatically cleaned up.
>> 91 try-run = $(shell set -e; \
>> 92 TMP="$(TMPOUT).$$$$.tmp"; \
>> 93 TMPO="$(TMPOUT).$$$$.o"; \
>> 94 if ($(1)) >/dev/null 2>&1; \
>> 95 then echo "$(2)"; \
>> 96 else echo "$(3)"; \
>> 97 fi; \
>> 98 rm -f "$$TMP" "$$TMPO")
>> 99
>> 100 # as-option
>> 101 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
>> 102
>> 103 as-option = $(call try-run,\
>> 104 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
>> 105
>> 106 # as-instr
>> 107 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
>> 108
>> 109 as-instr = $(call try-run,\
>> 110 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
>> 111
>> 112 # __cc-option
>> 113 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
>> 114 __cc-option = $(call try-run,\
>> 115 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
>> 116
>> 117 # Do not attempt to build with gcc plugins during cc-option tests.
>> 118 # (And this uses delayed resolution so the flags will be up to date.)
>> 119 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
>> 120
>> 121 # cc-option
>> 122 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
>> 123
>> 124 cc-option = $(call __cc-option, $(CC),\
>> 125 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
>> 126
>> 127 # hostcc-option
>> 128 # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
>> 129 hostcc-option = $(call __cc-option, $(HOSTCC),\
>> 130 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
>> 131
>> 132 # cc-option-yn
>> 133 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
>> 134 cc-option-yn = $(call try-run,\
>> 135 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
>> 136
>> 137 # cc-disable-warning
>> 138 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
>> 139 cc-disable-warning = $(call try-run,\
>> 140 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
>> 141
>> 142 # cc-ifversion
>> 143 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
>> 144 cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
>> 145
>> 146 # cc-ldoption
>> 147 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
>> 148 cc-ldoption = $(call try-run,\
>> 149 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
>> 150
>> 151 # ld-option
>> 152 # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
>> 153 ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
>> 154
>> 155 # ar-option
>> 156 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
>> 157 # Important: no spaces around options
>> 158 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
>> 159
>> 160 # ld-version
>> 161 # Note this is mainly for HJ Lu's 3 number binutil versions
>> 162 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
>> 163
>> 164 # ld-ifversion
>> 165 # Usage: $(call ld-ifversion, -ge, 22252, y)
>> 166 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
>> 167
>> 168 ######
>> 169
109 ### 170 ###
110 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 171 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
111 # Usage: 172 # Usage:
112 # $(Q)$(MAKE) $(build)=dir 173 # $(Q)$(MAKE) $(build)=dir
113 build := -f $(srctree)/scripts/Makefile.build 174 build := -f $(srctree)/scripts/Makefile.build obj
114 175
115 ### 176 ###
>> 177 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
>> 178 # Usage:
>> 179 # $(Q)$(MAKE) $(modbuiltin)=dir
>> 180 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
>> 181
>> 182 ###
>> 183 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
>> 184 # Usage:
>> 185 # $(Q)$(MAKE) $(dtbinst)=dir
>> 186 dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
>> 187
>> 188 ###
116 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 189 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
117 # Usage: 190 # Usage:
118 # $(Q)$(MAKE) $(clean)=dir 191 # $(Q)$(MAKE) $(clean)=dir
119 clean := -f $(srctree)/scripts/Makefile.clean 192 clean := -f $(srctree)/scripts/Makefile.clean obj
120 193
121 # pring log !! 194 ###
122 # !! 195 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
123 # If quiet is "silent_", print nothing and sin !! 196 # Usage:
124 # If quiet is "quiet_", print short log !! 197 # $(Q)$(MAKE) $(hdr-inst)=dir
125 # If quiet is empty, print short log and whole !! 198 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
126 silent_log_print = exec >/dev/null; !! 199
127 quiet_log_print = $(if $(quiet_cmd_$1), echo !! 200 # Prefix -I with $(srctree) if it is not an absolute path.
128 log_print = echo '$(pound) $(call escsq !! 201 # skip if -I has no parameter
129 echo ' $(call escsq,$(cmd_ !! 202 addtree = $(if $(patsubst -I%,%,$(1)), \
130 !! 203 $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
131 # Delete the target on interruption !! 204
132 # !! 205 # Find all -I options and call addtree
133 # GNU Make automatically deletes the target if !! 206 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
134 # the interrupted recipe. So, you can safely s !! 207
135 # will delete incomplete targets), and resume !! 208 # echo command.
136 # !! 209 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
137 # However, this does not work when the stderr !! 210 echo-cmd = $(if $($(quiet)cmd_$(1)),\
138 # $ make >&2 | tee log !! 211 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 $@; trap - <<
151 212
152 # print and execute commands !! 213 # printing commands
153 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_ !! 214 cmd = @set -e; $(echo-cmd) $(cmd_$(1))
>> 215
>> 216 # Add $(obj)/ for paths that are not absolute
>> 217 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
154 218
155 ### 219 ###
156 # if_changed - execute command if any pre 220 # if_changed - execute command if any prerequisite is newer than
157 # target, or command line ha 221 # target, or command line has changed
158 # if_changed_dep - as if_changed, but uses fi 222 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
159 # including used config symb 223 # including used config symbols
160 # if_changed_rule - as if_changed but execute 224 # if_changed_rule - as if_changed but execute rule instead
161 # See Documentation/kbuild/makefiles.rst for m !! 225 # See Documentation/kbuild/makefiles.txt for more info
162 226
163 ifneq ($(KBUILD_NOCMDDEP),1) 227 ifneq ($(KBUILD_NOCMDDEP),1)
164 # Check if both commands are the same includin !! 228 # Check if both arguments are the same including their order. Result is empty
165 # string if equal. User may override this chec 229 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
166 # If the target does not exist, the *.cmd file !! 230 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 231 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
171 else 232 else
172 # We still need to detect missing targets. !! 233 arg-check = $(if $(strip $(cmd_$@)),,1)
173 cmd-check = $(if $(strip $(savedcmd_$@)),,1) <<
174 endif 234 endif
175 235
176 # Replace >$< with >$$< to preserve $ when rel 236 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
177 # (needed for make) 237 # (needed for make)
178 # Replace >#< with >$(pound)< to avoid startin 238 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
179 # (needed for make) 239 # (needed for make)
180 # Replace >'< with >'\''< to be able to enclos 240 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
181 # (needed for the shell) 241 # (needed for the shell)
182 make-cmd = $(call escsq,$(subst $(pound),$$(po 242 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
183 243
184 # Find any prerequisites that are newer than t !! 244 # Find any prerequisites that is newer than target or that does not exist.
185 # PHONY targets skipped in both cases. 245 # PHONY targets skipped in both cases.
186 # If there is no prerequisite other than phony !! 246 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) <<
195 247
196 # Execute command if command has changed or pr 248 # Execute command if command has changed or prerequisite(s) are updated.
197 if_changed = $(if $(if-changed-cond),$(cmd_and !! 249 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
198 <<
199 cmd_and_savecmd = <<
200 $(cmd); 250 $(cmd); \
201 printf '%s\n' 'savedcmd_$@ := $(make-c !! 251 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
202 252
203 # Execute the command and also postprocess gen 253 # Execute the command and also postprocess generated .d dependencies file.
204 if_changed_dep = $(if $(if-changed-cond),$(cmd !! 254 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)
205 255
206 cmd_and_fixdep = 256 cmd_and_fixdep = \
207 $(cmd); 257 $(cmd); \
208 scripts/basic/fixdep $(depfile) $@ '$( 258 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
209 rm -f $(depfile) 259 rm -f $(depfile)
210 260
211 # Usage: $(call if_changed_rule,foo) 261 # Usage: $(call if_changed_rule,foo)
212 # Will check if $(cmd_foo) or any of the prere 262 # Will check if $(cmd_foo) or any of the prerequisites changed,
213 # and if so will execute $(rule_foo). 263 # and if so will execute $(rule_foo).
214 if_changed_rule = $(if $(if-changed-cond),$(ru !! 264 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)
215 265
216 ### 266 ###
217 # why - tell why a target got built 267 # why - tell why a target got built
218 # enabled by make V=2 268 # enabled by make V=2
219 # Output (listed in the order they are c 269 # Output (listed in the order they are checked):
220 # (1) - due to target is PHONY 270 # (1) - due to target is PHONY
221 # (2) - due to target missing 271 # (2) - due to target missing
222 # (3) - due to: file1.h file2.h 272 # (3) - due to: file1.h file2.h
223 # (4) - due to command line change 273 # (4) - due to command line change
224 # (5) - due to missing .cmd file 274 # (5) - due to missing .cmd file
225 # (6) - due to target not in $(target 275 # (6) - due to target not in $(targets)
226 # (1) PHONY targets are always build 276 # (1) PHONY targets are always build
227 # (2) No target, so we better build it 277 # (2) No target, so we better build it
228 # (3) Prerequisite is newer than target 278 # (3) Prerequisite is newer than target
229 # (4) The command line stored in the file name 279 # (4) The command line stored in the file named dir/.target.cmd
230 # differed from actual command line. This 280 # differed from actual command line. This happens when compiler
231 # options changes 281 # options changes
232 # (5) No dir/.target.cmd file (used to store c 282 # (5) No dir/.target.cmd file (used to store command line)
233 # (6) No dir/.target.cmd file and target not l 283 # (6) No dir/.target.cmd file and target not listed in $(targets)
234 # This is a good hint that there is a bug 284 # This is a good hint that there is a bug in the kbuild file
235 ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) !! 285 ifeq ($(KBUILD_VERBOSE),2)
236 _why = !! 286 why = \
237 $(if $(filter $@, $(PHONY)),- due to targe 287 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
238 $(if $(wildcard $@), 288 $(if $(wildcard $@), \
239 $(if $(newer-prereqs),- due to: $( !! 289 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
240 $(if $(cmd-check), !! 290 $(if $(arg-check), \
241 $(if $(savedcmd_$@),- due !! 291 $(if $(cmd_$@),- due to command line change, \
242 $(if $(filter $@, $(ta 292 $(if $(filter $@, $(targets)), \
243 - due to missing . 293 - due to missing .cmd file, \
244 - due to $(notdir 294 - due to $(notdir $@) not in $$(targets) \
245 ) 295 ) \
246 ) 296 ) \
247 ) 297 ) \
248 ), 298 ), \
249 - due to target missing 299 - due to target missing \
250 ) 300 ) \
251 ) 301 )
252 302
253 why = $(space)$(strip $(_why)) !! 303 echo-why = $(call escsq, $(strip $(why)))
254 endif 304 endif
255 305
256 ############################################## 306 ###############################################################################
>> 307 #
>> 308 # When a Kconfig string contains a filename, it is suitable for
>> 309 # passing to shell commands. It is surrounded by double-quotes, and
>> 310 # any double-quotes or backslashes within it are escaped by
>> 311 # backslashes.
>> 312 #
>> 313 # This is no use for dependencies or $(wildcard). We need to strip the
>> 314 # surrounding quotes and the escaping from quotes and backslashes, and
>> 315 # we *do* need to escape any spaces in the string. So, for example:
>> 316 #
>> 317 # Usage: $(eval $(call config_filename,FOO))
>> 318 #
>> 319 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
>> 320 # transformed as described above to be suitable for use within the
>> 321 # makefile.
>> 322 #
>> 323 # Also, if the filename is a relative filename and exists in the source
>> 324 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
>> 325 # be prefixed to *both* command invocation and dependencies.
>> 326 #
>> 327 # Note: We also print the filenames in the quiet_cmd_foo text, and
>> 328 # perhaps ought to have a version specially escaped for that purpose.
>> 329 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
>> 330 # enough. It'll strip the quotes in the common case where there's no
>> 331 # space and it's a simple filename, and it'll retain the quotes when
>> 332 # there's a space. There are some esoteric cases in which it'll print
>> 333 # the wrong thing, but we don't really care. The actual dependencies
>> 334 # and commands *do* get it right, with various combinations of single
>> 335 # and double quotes, backslashes and spaces in the filenames.
>> 336 #
>> 337 ###############################################################################
>> 338 #
>> 339 define config_filename
>> 340 ifneq ($$(CONFIG_$(1)),"")
>> 341 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
>> 342 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
>> 343 else
>> 344 ifeq ($$(wildcard $$($(1)_FILENAME)),)
>> 345 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
>> 346 $(1)_SRCPREFIX := $(srctree)/
>> 347 endif
>> 348 endif
>> 349 endif
>> 350 endif
>> 351 endef
>> 352 #
>> 353 ###############################################################################
257 354
258 # delete partially updated (i.e. corrupted) fi 355 # delete partially updated (i.e. corrupted) files on error
259 .DELETE_ON_ERROR: 356 .DELETE_ON_ERROR:
260 357
261 # do not delete intermediate files automatical 358 # do not delete intermediate files automatically
262 # <<
263 # .NOTINTERMEDIATE is more correct, but only a <<
264 # Make 4.4 introduced .NOTINTERMEDIATE, and it <<
265 # global .NOTINTERMEDIATE does not work. We ca <<
266 # Use .SECONDARY for older Make versions, but <<
267 # deleted files. <<
268 ifneq ($(and $(filter notintermediate, $(.FEAT <<
269 .NOTINTERMEDIATE: <<
270 else <<
271 .SECONDARY: 359 .SECONDARY:
272 endif <<
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