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 # filename of first prerequisite with directory and extension stripped
53 real-prereqs = $(filter-out $(PHONY), $^) !! 28 baseprereq = $(basename $(notdir $<))
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 # define filechk_sample
88 # filechk_sample = echo $(KERNELRELEASE) !! 45 # echo $KERNELRELEASE
89 # version.h: FORCE !! 46 # endef
>> 47 # version.h : Makefile
90 # $(call filechk,sample) 48 # $(call filechk,sample)
91 # <<
92 # The rule defined shall write to stdout the c 49 # The rule defined shall write to stdout the content of the new file.
93 # The existing file will be compared with the 50 # The existing file will be compared with the new one.
94 # - If no file exist it is created 51 # - If no file exist it is created
95 # - If the content differ the new file is used 52 # - If the content differ the new file is used
96 # - If they are equal no change, and no timest 53 # - If they are equal no change, and no timestamp update
>> 54 # - stdin is piped in from the first prerequisite ($<) 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 := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
>> 74 # Return first prefix where a prefix$(CC) is found in PATH.
>> 75 # If no $(CC) found in PATH with listed prefixes return nothing
>> 76 cc-cross-prefix = \
>> 77 $(word 1, $(foreach c,$(1), \
>> 78 $(shell set -e; \
>> 79 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
>> 80 echo $(c); \
>> 81 fi)))
>> 82
>> 83 # output directory for tests below
>> 84 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
>> 85
>> 86 # try-run
>> 87 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
>> 88 # Exit code chooses option. "$$TMP" serves as a temporary file and is
>> 89 # automatically cleaned up.
>> 90 try-run = $(shell set -e; \
>> 91 TMP="$(TMPOUT).$$$$.tmp"; \
>> 92 TMPO="$(TMPOUT).$$$$.o"; \
>> 93 if ($(1)) >/dev/null 2>&1; \
>> 94 then echo "$(2)"; \
>> 95 else echo "$(3)"; \
>> 96 fi; \
>> 97 rm -f "$$TMP" "$$TMPO")
>> 98
>> 99 # as-option
>> 100 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
>> 101
>> 102 as-option = $(call try-run,\
>> 103 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
>> 104
>> 105 # as-instr
>> 106 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
>> 107
>> 108 as-instr = $(call try-run,\
>> 109 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
>> 110
>> 111 # __cc-option
>> 112 # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
>> 113 __cc-option = $(call try-run,\
>> 114 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
>> 115
>> 116 # Do not attempt to build with gcc plugins during cc-option tests.
>> 117 # (And this uses delayed resolution so the flags will be up to date.)
>> 118 CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
>> 119
>> 120 # cc-option
>> 121 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
>> 122
>> 123 cc-option = $(call __cc-option, $(CC),\
>> 124 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
>> 125
>> 126 # hostcc-option
>> 127 # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
>> 128 hostcc-option = $(call __cc-option, $(HOSTCC),\
>> 129 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
>> 130
>> 131 # cc-option-yn
>> 132 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
>> 133 cc-option-yn = $(call try-run,\
>> 134 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
>> 135
>> 136 # cc-disable-warning
>> 137 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
>> 138 cc-disable-warning = $(call try-run,\
>> 139 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
>> 140
>> 141 # cc-name
>> 142 # Expands to either gcc or clang
>> 143 cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
>> 144
>> 145 # cc-version
>> 146 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
>> 147
>> 148 # cc-fullversion
>> 149 cc-fullversion = $(shell $(CONFIG_SHELL) \
>> 150 $(srctree)/scripts/gcc-version.sh -p $(CC))
>> 151
>> 152 # cc-ifversion
>> 153 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
>> 154 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
>> 155
>> 156 # cc-if-fullversion
>> 157 # Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
>> 158 cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
>> 159
>> 160 # cc-ldoption
>> 161 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
>> 162 cc-ldoption = $(call try-run,\
>> 163 $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
>> 164
>> 165 # ld-option
>> 166 # Usage: LDFLAGS += $(call ld-option, -X)
>> 167 ld-option = $(call try-run, $(LD) $(LDFLAGS) $(1) -v,$(1),$(2))
>> 168
>> 169 # ar-option
>> 170 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
>> 171 # Important: no spaces around options
>> 172 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
>> 173
>> 174 # ld-version
>> 175 # Note this is mainly for HJ Lu's 3 number binutil versions
>> 176 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
>> 177
>> 178 # ld-ifversion
>> 179 # Usage: $(call ld-ifversion, -ge, 22252, y)
>> 180 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
>> 181
>> 182 ######
>> 183
109 ### 184 ###
110 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 185 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
111 # Usage: 186 # Usage:
112 # $(Q)$(MAKE) $(build)=dir 187 # $(Q)$(MAKE) $(build)=dir
113 build := -f $(srctree)/scripts/Makefile.build 188 build := -f $(srctree)/scripts/Makefile.build obj
114 189
115 ### 190 ###
>> 191 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
>> 192 # Usage:
>> 193 # $(Q)$(MAKE) $(modbuiltin)=dir
>> 194 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
>> 195
>> 196 ###
>> 197 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
>> 198 # Usage:
>> 199 # $(Q)$(MAKE) $(dtbinst)=dir
>> 200 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
>> 201
>> 202 ###
116 # Shorthand for $(Q)$(MAKE) -f scripts/Makefil 203 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
117 # Usage: 204 # Usage:
118 # $(Q)$(MAKE) $(clean)=dir 205 # $(Q)$(MAKE) $(clean)=dir
119 clean := -f $(srctree)/scripts/Makefile.clean 206 clean := -f $(srctree)/scripts/Makefile.clean obj
120 207
121 # pring log !! 208 ###
122 # !! 209 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
123 # If quiet is "silent_", print nothing and sin !! 210 # Usage:
124 # If quiet is "quiet_", print short log !! 211 # $(Q)$(MAKE) $(hdr-inst)=dir
125 # If quiet is empty, print short log and whole !! 212 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
126 silent_log_print = exec >/dev/null; <<
127 quiet_log_print = $(if $(quiet_cmd_$1), echo <<
128 log_print = echo '$(pound) $(call escsq <<
129 echo ' $(call escsq,$(cmd_ <<
130 213
131 # Delete the target on interruption !! 214 # Prefix -I with $(srctree) if it is not an absolute path.
132 # !! 215 # skip if -I has no parameter
133 # GNU Make automatically deletes the target if !! 216 addtree = $(if $(patsubst -I%,%,$(1)), \
134 # the interrupted recipe. So, you can safely s !! 217 $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
135 # will delete incomplete targets), and resume !! 218
136 # !! 219 # Find all -I options and call addtree
137 # However, this does not work when the stderr !! 220 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
138 # $ make >&2 | tee log !! 221
139 # Make dies with SIGPIPE before cleaning the t !! 222 # echo command.
140 # !! 223 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
141 # To address it, we clean the target in signal !! 224 echo-cmd = $(if $($(quiet)cmd_$(1)),\
142 # !! 225 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
143 # Make deletes the target when it catches SIGH !! 226
144 # So, we cover them, and also SIGPIPE just in !! 227 # printing commands
145 # !! 228 cmd = @$(echo-cmd) $(cmd_$(1))
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 - <<
151 229
152 # print and execute commands !! 230 # Add $(obj)/ for paths that are not absolute
153 cmd = @$(if $(cmd_$(1)),set -e; $($(quiet)log_ !! 231 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
154 232
155 ### 233 ###
156 # if_changed - execute command if any pre 234 # if_changed - execute command if any prerequisite is newer than
157 # target, or command line ha 235 # target, or command line has changed
158 # if_changed_dep - as if_changed, but uses fi 236 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
159 # including used config symb 237 # including used config symbols
160 # if_changed_rule - as if_changed but execute 238 # if_changed_rule - as if_changed but execute rule instead
161 # See Documentation/kbuild/makefiles.rst for m !! 239 # See Documentation/kbuild/makefiles.txt for more info
162 240
163 ifneq ($(KBUILD_NOCMDDEP),1) 241 ifneq ($(KBUILD_NOCMDDEP),1)
164 # Check if both commands are the same includin !! 242 # Check if both arguments are the same including their order. Result is empty
165 # string if equal. User may override this chec 243 # string if equal. User may override this check using make KBUILD_NOCMDDEP=1
166 # If the target does not exist, the *.cmd file !! 244 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 245 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
171 else 246 else
172 # We still need to detect missing targets. !! 247 arg-check = $(if $(strip $(cmd_$@)),,1)
173 cmd-check = $(if $(strip $(savedcmd_$@)),,1) <<
174 endif 248 endif
175 249
176 # Replace >$< with >$$< to preserve $ when rel 250 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
177 # (needed for make) 251 # (needed for make)
178 # Replace >#< with >$(pound)< to avoid startin 252 # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
179 # (needed for make) 253 # (needed for make)
180 # Replace >'< with >'\''< to be able to enclos 254 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
181 # (needed for the shell) 255 # (needed for the shell)
182 make-cmd = $(call escsq,$(subst $(pound),$$(po 256 make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
183 257
184 # Find any prerequisites that are newer than t !! 258 # Find any prerequisites that is newer than target or that does not exist.
185 # PHONY targets skipped in both cases. 259 # PHONY targets skipped in both cases.
186 # If there is no prerequisite other than phony !! 260 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) <<
195 261
196 # Execute command if command has changed or pr 262 # Execute command if command has changed or prerequisite(s) are updated.
197 if_changed = $(if $(if-changed-cond),$(cmd_and !! 263 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
198 !! 264 @set -e; \
199 cmd_and_savecmd = !! 265 $(echo-cmd) $(cmd_$(1)); \
200 $(cmd); !! 266 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
201 printf '%s\n' 'savedcmd_$@ := $(make-c <<
202 267
203 # Execute the command and also postprocess gen 268 # Execute the command and also postprocess generated .d dependencies file.
204 if_changed_dep = $(if $(if-changed-cond),$(cmd !! 269 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
>> 270 @set -e; \
>> 271 $(cmd_and_fixdep), @:)
>> 272
>> 273 ifndef CONFIG_TRIM_UNUSED_KSYMS
>> 274
>> 275 cmd_and_fixdep = \
>> 276 $(echo-cmd) $(cmd_$(1)); \
>> 277 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
>> 278 rm -f $(depfile); \
>> 279 mv -f $(dot-target).tmp $(dot-target).cmd;
>> 280
>> 281 else
>> 282
>> 283 # Filter out exported kernel symbol names from the preprocessor output.
>> 284 # See also __KSYM_DEPS__ in include/linux/export.h.
>> 285 # We disable the depfile generation here, so as not to overwrite the existing
>> 286 # depfile while fixdep is parsing it.
>> 287 flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
>> 288 ksym_dep_filter = \
>> 289 case "$(1)" in \
>> 290 cc_*_c|cpp_i_c) \
>> 291 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
>> 292 as_*_S|cpp_s_S) \
>> 293 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
>> 294 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
>> 295 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
>> 296 esac | tr ";" "\n" | sed -n 's/^.*=== __KSYM_\(.*\) ===.*$$/_\1/p'
205 297
206 cmd_and_fixdep = 298 cmd_and_fixdep = \
207 $(cmd); !! 299 $(echo-cmd) $(cmd_$(1)); \
208 scripts/basic/fixdep $(depfile) $@ '$( !! 300 $(ksym_dep_filter) | \
209 rm -f $(depfile) !! 301 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
>> 302 > $(dot-target).tmp; \
>> 303 rm -f $(depfile); \
>> 304 mv -f $(dot-target).tmp $(dot-target).cmd;
>> 305
>> 306 endif
210 307
211 # Usage: $(call if_changed_rule,foo) 308 # Usage: $(call if_changed_rule,foo)
212 # Will check if $(cmd_foo) or any of the prere 309 # Will check if $(cmd_foo) or any of the prerequisites changed,
213 # and if so will execute $(rule_foo). 310 # and if so will execute $(rule_foo).
214 if_changed_rule = $(if $(if-changed-cond),$(ru !! 311 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
>> 312 @set -e; \
>> 313 $(rule_$(1)), @:)
215 314
216 ### 315 ###
217 # why - tell why a target got built 316 # why - tell why a target got built
218 # enabled by make V=2 317 # enabled by make V=2
219 # Output (listed in the order they are c 318 # Output (listed in the order they are checked):
220 # (1) - due to target is PHONY 319 # (1) - due to target is PHONY
221 # (2) - due to target missing 320 # (2) - due to target missing
222 # (3) - due to: file1.h file2.h 321 # (3) - due to: file1.h file2.h
223 # (4) - due to command line change 322 # (4) - due to command line change
224 # (5) - due to missing .cmd file 323 # (5) - due to missing .cmd file
225 # (6) - due to target not in $(target 324 # (6) - due to target not in $(targets)
226 # (1) PHONY targets are always build 325 # (1) PHONY targets are always build
227 # (2) No target, so we better build it 326 # (2) No target, so we better build it
228 # (3) Prerequisite is newer than target 327 # (3) Prerequisite is newer than target
229 # (4) The command line stored in the file name 328 # (4) The command line stored in the file named dir/.target.cmd
230 # differed from actual command line. This 329 # differed from actual command line. This happens when compiler
231 # options changes 330 # options changes
232 # (5) No dir/.target.cmd file (used to store c 331 # (5) No dir/.target.cmd file (used to store command line)
233 # (6) No dir/.target.cmd file and target not l 332 # (6) No dir/.target.cmd file and target not listed in $(targets)
234 # This is a good hint that there is a bug 333 # This is a good hint that there is a bug in the kbuild file
235 ifneq ($(findstring 2, $(KBUILD_VERBOSE)),) !! 334 ifeq ($(KBUILD_VERBOSE),2)
236 _why = !! 335 why = \
237 $(if $(filter $@, $(PHONY)),- due to targe 336 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
238 $(if $(wildcard $@), 337 $(if $(wildcard $@), \
239 $(if $(newer-prereqs),- due to: $( !! 338 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
240 $(if $(cmd-check), !! 339 $(if $(arg-check), \
241 $(if $(savedcmd_$@),- due !! 340 $(if $(cmd_$@),- due to command line change, \
242 $(if $(filter $@, $(ta 341 $(if $(filter $@, $(targets)), \
243 - due to missing . 342 - due to missing .cmd file, \
244 - due to $(notdir 343 - due to $(notdir $@) not in $$(targets) \
245 ) 344 ) \
246 ) 345 ) \
247 ) 346 ) \
248 ), 347 ), \
249 - due to target missing 348 - due to target missing \
250 ) 349 ) \
251 ) 350 )
252 351
253 why = $(space)$(strip $(_why)) !! 352 echo-why = $(call escsq, $(strip $(why)))
254 endif 353 endif
255 354
256 ############################################## 355 ###############################################################################
257 <<
258 # delete partially updated (i.e. corrupted) fi <<
259 .DELETE_ON_ERROR: <<
260 <<
261 # do not delete intermediate files automatical <<
262 # 356 #
263 # .NOTINTERMEDIATE is more correct, but only a !! 357 # When a Kconfig string contains a filename, it is suitable for
264 # Make 4.4 introduced .NOTINTERMEDIATE, and it !! 358 # passing to shell commands. It is surrounded by double-quotes, and
265 # global .NOTINTERMEDIATE does not work. We ca !! 359 # any double-quotes or backslashes within it are escaped by
266 # Use .SECONDARY for older Make versions, but !! 360 # backslashes.
267 # deleted files. !! 361 #
268 ifneq ($(and $(filter notintermediate, $(.FEAT !! 362 # This is no use for dependencies or $(wildcard). We need to strip the
269 .NOTINTERMEDIATE: !! 363 # surrounding quotes and the escaping from quotes and backslashes, and
>> 364 # we *do* need to escape any spaces in the string. So, for example:
>> 365 #
>> 366 # Usage: $(eval $(call config_filename,FOO))
>> 367 #
>> 368 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
>> 369 # transformed as described above to be suitable for use within the
>> 370 # makefile.
>> 371 #
>> 372 # Also, if the filename is a relative filename and exists in the source
>> 373 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
>> 374 # be prefixed to *both* command invocation and dependencies.
>> 375 #
>> 376 # Note: We also print the filenames in the quiet_cmd_foo text, and
>> 377 # perhaps ought to have a version specially escaped for that purpose.
>> 378 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
>> 379 # enough. It'll strip the quotes in the common case where there's no
>> 380 # space and it's a simple filename, and it'll retain the quotes when
>> 381 # there's a space. There are some esoteric cases in which it'll print
>> 382 # the wrong thing, but we don't really care. The actual dependencies
>> 383 # and commands *do* get it right, with various combinations of single
>> 384 # and double quotes, backslashes and spaces in the filenames.
>> 385 #
>> 386 ###############################################################################
>> 387 #
>> 388 define config_filename
>> 389 ifneq ($$(CONFIG_$(1)),"")
>> 390 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
>> 391 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
270 else 392 else
271 .SECONDARY: !! 393 ifeq ($$(wildcard $$($(1)_FILENAME)),)
>> 394 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
>> 395 $(1)_SRCPREFIX := $(srctree)/
>> 396 endif
272 endif 397 endif
>> 398 endif
>> 399 endif
>> 400 endef
>> 401 #
>> 402 ###############################################################################
>> 403
>> 404 # delete partially updated (i.e. corrupted) files on error
>> 405 .DELETE_ON_ERROR:
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