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1####
2# kbuild: Generic definitions
3
4# Convenient variables
5comma := ,
6quote := "
7squote := '
8empty :=
9space := $(empty) $(empty)
10space_escape := _-_SPACE_-_
11
12###
13# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
14dot-target = $(dir $@).$(notdir $@)
15
16###
17# The temporary file to save gcc -MD generated dependencies must not
18# contain a comma
19depfile = $(subst $(comma),_,$(dot-target).d)
20
21###
22# filename of target with directory and extension stripped
23basetarget = $(basename $(notdir $@))
24
25###
26# filename of first prerequisite with directory and extension stripped
27baseprereq = $(basename $(notdir $<))
28
29###
30# Escape single quote for use in echo statements
31escsq = $(subst $(squote),'\$(squote)',$1)
32
33###
34# Easy method for doing a status message
35 kecho := :
36 quiet_kecho := echo
37silent_kecho := :
38kecho := $($(quiet)kecho)
39
40###
41# filechk is used to check if the content of a generated file is updated.
42# Sample usage:
43# define filechk_sample
44# echo $KERNELRELEASE
45# endef
46# version.h : Makefile
47# $(call filechk,sample)
48# The rule defined shall write to stdout the content of the new file.
49# The existing file will be compared with the new one.
50# - If no file exist it is created
51# - If the content differ the new file is used
52# - If they are equal no change, and no timestamp update
53# - stdin is piped in from the first prerequisite ($<) so one has
54# to specify a valid file as first prerequisite (often the kbuild file)
55define filechk
56 $(Q)set -e; \
57 $(kecho) ' CHK $@'; \
58 mkdir -p $(dir $@); \
59 $(filechk_$(1)) < $< > $@.tmp; \
60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
61 rm -f $@.tmp; \
62 else \
63 $(kecho) ' UPD $@'; \
64 mv -f $@.tmp $@; \
65 fi
66endef
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
76cc-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
84TMPOUT := $(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" is can be used as temporary file and
89# is automatically cleaned up.
90try-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" "$$TMPO")
98
99# as-option
100# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
101
102as-option = $(call try-run,\
103 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
104
105# as-instr
106# Usage: cflags-y += $(call as-instr,instr,option1,option2)
107
108as-instr = $(call try-run,\
109 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
110
111# Do not attempt to build with gcc plugins during cc-option tests.
112# (And this uses delayed resolution so the flags will be up to date.)
113CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
114
115# cc-option
116# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
117
118cc-option = $(call try-run,\
119 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
120
121# cc-option-yn
122# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
123cc-option-yn = $(call try-run,\
124 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
125
126# cc-option-align
127# Prefix align with either -falign or -malign
128cc-option-align = $(subst -functions=0,,\
129 $(call cc-option,-falign-functions=0,-malign-functions=0))
130
131# cc-disable-warning
132# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
133cc-disable-warning = $(call try-run,\
134 $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
135
136# cc-name
137# Expands to either gcc or clang
138cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
139
140# cc-version
141cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
142
143# cc-fullversion
144cc-fullversion = $(shell $(CONFIG_SHELL) \
145 $(srctree)/scripts/gcc-version.sh -p $(CC))
146
147# cc-ifversion
148# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
149cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
150
151# cc-ldoption
152# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
153cc-ldoption = $(call try-run,\
154 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
155
156# ld-option
157# Usage: LDFLAGS += $(call ld-option, -X)
158ld-option = $(call try-run,\
159 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
160
161# ar-option
162# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
163# Important: no spaces around options
164ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
165
166# ld-version
167# Note this is mainly for HJ Lu's 3 number binutil versions
168ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
169
170# ld-ifversion
171# Usage: $(call ld-ifversion, -ge, 22252, y)
172ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
173
174######
175
176###
177# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
178# Usage:
179# $(Q)$(MAKE) $(build)=dir
180build := -f $(srctree)/scripts/Makefile.build obj
181
182###
183# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
184# Usage:
185# $(Q)$(MAKE) $(modbuiltin)=dir
186modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
187
188###
189# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
190# Usage:
191# $(Q)$(MAKE) $(dtbinst)=dir
192dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
193
194###
195# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
196# Usage:
197# $(Q)$(MAKE) $(clean)=dir
198clean := -f $(srctree)/scripts/Makefile.clean obj
199
200###
201# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
202# Usage:
203# $(Q)$(MAKE) $(hdr-inst)=dir
204hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
205
206# Prefix -I with $(srctree) if it is not an absolute path.
207# skip if -I has no parameter
208addtree = $(if $(patsubst -I%,%,$(1)), \
209$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
210
211# Find all -I options and call addtree
212flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
213
214# echo command.
215# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
216echo-cmd = $(if $($(quiet)cmd_$(1)),\
217 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
218
219# printing commands
220cmd = @$(echo-cmd) $(cmd_$(1))
221
222# Add $(obj)/ for paths that are not absolute
223objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
224
225###
226# if_changed - execute command if any prerequisite is newer than
227# target, or command line has changed
228# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
229# including used config symbols
230# if_changed_rule - as if_changed but execute rule instead
231# See Documentation/kbuild/makefiles.txt for more info
232
233ifneq ($(KBUILD_NOCMDDEP),1)
234# Check if both arguments are the same including their order. Result is empty
235# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
236arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
237 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
238else
239arg-check = $(if $(strip $(cmd_$@)),,1)
240endif
241
242# Replace >$< with >$$< to preserve $ when reloading the .cmd file
243# (needed for make)
244# Replace >#< with >\#< to avoid starting a comment in the .cmd file
245# (needed for make)
246# Replace >'< with >'\''< to be able to enclose the whole string in '...'
247# (needed for the shell)
248make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
249
250# Find any prerequisites that is newer than target or that does not exist.
251# PHONY targets skipped in both cases.
252any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
253
254# Execute command if command has changed or prerequisite(s) are updated.
255#
256if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
257 @set -e; \
258 $(echo-cmd) $(cmd_$(1)); \
259 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
260
261# Execute the command and also postprocess generated .d dependencies file.
262if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
263 @set -e; \
264 $(cmd_and_fixdep), @:)
265
266ifndef CONFIG_TRIM_UNUSED_KSYMS
267
268cmd_and_fixdep = \
269 $(echo-cmd) $(cmd_$(1)); \
270 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
271 rm -f $(depfile); \
272 mv -f $(dot-target).tmp $(dot-target).cmd;
273
274else
275
276# Filter out exported kernel symbol names from the preprocessor output.
277# See also __KSYM_DEPS__ in include/linux/export.h.
278# We disable the depfile generation here, so as not to overwrite the existing
279# depfile while fixdep is parsing it.
280flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
281ksym_dep_filter = \
282 case "$(1)" in \
283 cc_*_c|cpp_i_c) \
284 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
285 as_*_S|cpp_s_S) \
286 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
287 boot*|build*|*cpp_lds_S|dtc|host*|vdso*) : ;; \
288 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
289 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
290
291cmd_and_fixdep = \
292 $(echo-cmd) $(cmd_$(1)); \
293 $(ksym_dep_filter) | \
294 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
295 > $(dot-target).tmp; \
296 rm -f $(depfile); \
297 mv -f $(dot-target).tmp $(dot-target).cmd;
298
299endif
300
301# Usage: $(call if_changed_rule,foo)
302# Will check if $(cmd_foo) or any of the prerequisites changed,
303# and if so will execute $(rule_foo).
304if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
305 @set -e; \
306 $(rule_$(1)), @:)
307
308###
309# why - tell why a a target got build
310# enabled by make V=2
311# Output (listed in the order they are checked):
312# (1) - due to target is PHONY
313# (2) - due to target missing
314# (3) - due to: file1.h file2.h
315# (4) - due to command line change
316# (5) - due to missing .cmd file
317# (6) - due to target not in $(targets)
318# (1) PHONY targets are always build
319# (2) No target, so we better build it
320# (3) Prerequisite is newer than target
321# (4) The command line stored in the file named dir/.target.cmd
322# differed from actual command line. This happens when compiler
323# options changes
324# (5) No dir/.target.cmd file (used to store command line)
325# (6) No dir/.target.cmd file and target not listed in $(targets)
326# This is a good hint that there is a bug in the kbuild file
327ifeq ($(KBUILD_VERBOSE),2)
328why = \
329 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
330 $(if $(wildcard $@), \
331 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
332 $(if $(arg-check), \
333 $(if $(cmd_$@),- due to command line change, \
334 $(if $(filter $@, $(targets)), \
335 - due to missing .cmd file, \
336 - due to $(notdir $@) not in $$(targets) \
337 ) \
338 ) \
339 ) \
340 ), \
341 - due to target missing \
342 ) \
343 )
344
345echo-why = $(call escsq, $(strip $(why)))
346endif
347
348###############################################################################
349#
350# When a Kconfig string contains a filename, it is suitable for
351# passing to shell commands. It is surrounded by double-quotes, and
352# any double-quotes or backslashes within it are escaped by
353# backslashes.
354#
355# This is no use for dependencies or $(wildcard). We need to strip the
356# surrounding quotes and the escaping from quotes and backslashes, and
357# we *do* need to escape any spaces in the string. So, for example:
358#
359# Usage: $(eval $(call config_filename,FOO))
360#
361# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
362# transformed as described above to be suitable for use within the
363# makefile.
364#
365# Also, if the filename is a relative filename and exists in the source
366# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
367# be prefixed to *both* command invocation and dependencies.
368#
369# Note: We also print the filenames in the quiet_cmd_foo text, and
370# perhaps ought to have a version specially escaped for that purpose.
371# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
372# enough. It'll strip the quotes in the common case where there's no
373# space and it's a simple filename, and it'll retain the quotes when
374# there's a space. There are some esoteric cases in which it'll print
375# the wrong thing, but we don't really care. The actual dependencies
376# and commands *do* get it right, with various combinations of single
377# and double quotes, backslashes and spaces in the filenames.
378#
379###############################################################################
380#
381define config_filename
382ifneq ($$(CONFIG_$(1)),"")
383$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
384ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
385else
386ifeq ($$(wildcard $$($(1)_FILENAME)),)
387ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
388$(1)_SRCPREFIX := $(srctree)/
389endif
390endif
391endif
392endif
393endef
394#
395###############################################################################
1# SPDX-License-Identifier: GPL-2.0
2####
3# kbuild: Generic definitions
4
5# Convenient variables
6comma := ,
7quote := "
8squote := '
9empty :=
10space := $(empty) $(empty)
11space_escape := _-_SPACE_-_
12pound := \#
13
14###
15# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
16dot-target = $(dir $@).$(notdir $@)
17
18###
19# The temporary file to save gcc -MD generated dependencies must not
20# contain a comma
21depfile = $(subst $(comma),_,$(dot-target).d)
22
23###
24# filename of target with directory and extension stripped
25basetarget = $(basename $(notdir $@))
26
27###
28# real prerequisites without phony targets
29real-prereqs = $(filter-out $(PHONY), $^)
30
31###
32# Escape single quote for use in echo statements
33escsq = $(subst $(squote),'\$(squote)',$1)
34
35###
36# Easy method for doing a status message
37 kecho := :
38 quiet_kecho := echo
39silent_kecho := :
40kecho := $($(quiet)kecho)
41
42###
43# filechk is used to check if the content of a generated file is updated.
44# Sample usage:
45#
46# filechk_sample = echo $(KERNELRELEASE)
47# version.h: FORCE
48# $(call filechk,sample)
49#
50# The rule defined shall write to stdout the content of the new file.
51# The existing file will be compared with the new one.
52# - If no file exist it is created
53# - If the content differ the new file is used
54# - If they are equal no change, and no timestamp update
55# - stdin is piped in from the first prerequisite ($<) so one has
56# to specify a valid file as first prerequisite (often the kbuild file)
57define filechk
58 $(Q)set -e; \
59 mkdir -p $(dir $@); \
60 { $(filechk_$(1)); } > $@.tmp; \
61 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
62 rm -f $@.tmp; \
63 else \
64 $(kecho) ' UPD $@'; \
65 mv -f $@.tmp $@; \
66 fi
67endef
68
69######
70# gcc support functions
71# See documentation in Documentation/kbuild/makefiles.rst
72
73# cc-cross-prefix
74# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
75# Return first <prefix> where a <prefix>gcc is found in PATH.
76# If no gcc found in PATH with listed prefixes return nothing
77#
78# Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it
79# would try to directly execute the shell builtin 'command'. This workaround
80# should be kept for a long time since this issue was fixed only after the
81# GNU Make 4.2.1 release.
82cc-cross-prefix = $(firstword $(foreach c, $(1), \
83 $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c))))
84
85# output directory for tests below
86TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
87
88# try-run
89# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
90# Exit code chooses option. "$$TMP" serves as a temporary file and is
91# automatically cleaned up.
92try-run = $(shell set -e; \
93 TMP="$(TMPOUT).$$$$.tmp"; \
94 TMPO="$(TMPOUT).$$$$.o"; \
95 if ($(1)) >/dev/null 2>&1; \
96 then echo "$(2)"; \
97 else echo "$(3)"; \
98 fi; \
99 rm -f "$$TMP" "$$TMPO")
100
101# as-option
102# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
103
104as-option = $(call try-run,\
105 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
106
107# as-instr
108# Usage: cflags-y += $(call as-instr,instr,option1,option2)
109
110as-instr = $(call try-run,\
111 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
112
113# __cc-option
114# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
115__cc-option = $(call try-run,\
116 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
117
118# Do not attempt to build with gcc plugins during cc-option tests.
119# (And this uses delayed resolution so the flags will be up to date.)
120CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
121
122# cc-option
123# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
124
125cc-option = $(call __cc-option, $(CC),\
126 $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
127
128# cc-option-yn
129# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
130cc-option-yn = $(call try-run,\
131 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
132
133# cc-disable-warning
134# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
135cc-disable-warning = $(call try-run,\
136 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
137
138# cc-ifversion
139# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
140cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4))
141
142# ld-option
143# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
144ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
145
146# ld-version
147# Note this is mainly for HJ Lu's 3 number binutil versions
148ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
149
150# ld-ifversion
151# Usage: $(call ld-ifversion, -ge, 22252, y)
152ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
153
154######
155
156###
157# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
158# Usage:
159# $(Q)$(MAKE) $(build)=dir
160build := -f $(srctree)/scripts/Makefile.build obj
161
162###
163# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
164# Usage:
165# $(Q)$(MAKE) $(modbuiltin)=dir
166modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
167
168###
169# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
170# Usage:
171# $(Q)$(MAKE) $(dtbinst)=dir
172dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
173
174###
175# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
176# Usage:
177# $(Q)$(MAKE) $(clean)=dir
178clean := -f $(srctree)/scripts/Makefile.clean obj
179
180# echo command.
181# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
182echo-cmd = $(if $($(quiet)cmd_$(1)),\
183 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
184
185# printing commands
186cmd = @set -e; $(echo-cmd) $(cmd_$(1))
187
188###
189# if_changed - execute command if any prerequisite is newer than
190# target, or command line has changed
191# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
192# including used config symbols
193# if_changed_rule - as if_changed but execute rule instead
194# See Documentation/kbuild/makefiles.rst for more info
195
196ifneq ($(KBUILD_NOCMDDEP),1)
197# Check if both commands are the same including their order. Result is empty
198# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
199cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
200 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
201else
202cmd-check = $(if $(strip $(cmd_$@)),,1)
203endif
204
205# Replace >$< with >$$< to preserve $ when reloading the .cmd file
206# (needed for make)
207# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
208# (needed for make)
209# Replace >'< with >'\''< to be able to enclose the whole string in '...'
210# (needed for the shell)
211make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
212
213# Find any prerequisites that is newer than target or that does not exist.
214# PHONY targets skipped in both cases.
215any-prereq = $(filter-out $(PHONY),$?)$(filter-out $(PHONY) $(wildcard $^),$^)
216
217# Execute command if command has changed or prerequisite(s) are updated.
218if_changed = $(if $(any-prereq)$(cmd-check), \
219 $(cmd); \
220 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
221
222# Execute the command and also postprocess generated .d dependencies file.
223if_changed_dep = $(if $(any-prereq)$(cmd-check),$(cmd_and_fixdep),@:)
224
225cmd_and_fixdep = \
226 $(cmd); \
227 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
228 rm -f $(depfile)
229
230# Usage: $(call if_changed_rule,foo)
231# Will check if $(cmd_foo) or any of the prerequisites changed,
232# and if so will execute $(rule_foo).
233if_changed_rule = $(if $(any-prereq)$(cmd-check),$(rule_$(1)),@:)
234
235###
236# why - tell why a target got built
237# enabled by make V=2
238# Output (listed in the order they are checked):
239# (1) - due to target is PHONY
240# (2) - due to target missing
241# (3) - due to: file1.h file2.h
242# (4) - due to command line change
243# (5) - due to missing .cmd file
244# (6) - due to target not in $(targets)
245# (1) PHONY targets are always build
246# (2) No target, so we better build it
247# (3) Prerequisite is newer than target
248# (4) The command line stored in the file named dir/.target.cmd
249# differed from actual command line. This happens when compiler
250# options changes
251# (5) No dir/.target.cmd file (used to store command line)
252# (6) No dir/.target.cmd file and target not listed in $(targets)
253# This is a good hint that there is a bug in the kbuild file
254ifeq ($(KBUILD_VERBOSE),2)
255why = \
256 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
257 $(if $(wildcard $@), \
258 $(if $(any-prereq),- due to: $(any-prereq), \
259 $(if $(cmd-check), \
260 $(if $(cmd_$@),- due to command line change, \
261 $(if $(filter $@, $(targets)), \
262 - due to missing .cmd file, \
263 - due to $(notdir $@) not in $$(targets) \
264 ) \
265 ) \
266 ) \
267 ), \
268 - due to target missing \
269 ) \
270 )
271
272echo-why = $(call escsq, $(strip $(why)))
273endif
274
275###############################################################################
276#
277# When a Kconfig string contains a filename, it is suitable for
278# passing to shell commands. It is surrounded by double-quotes, and
279# any double-quotes or backslashes within it are escaped by
280# backslashes.
281#
282# This is no use for dependencies or $(wildcard). We need to strip the
283# surrounding quotes and the escaping from quotes and backslashes, and
284# we *do* need to escape any spaces in the string. So, for example:
285#
286# Usage: $(eval $(call config_filename,FOO))
287#
288# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
289# transformed as described above to be suitable for use within the
290# makefile.
291#
292# Also, if the filename is a relative filename and exists in the source
293# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
294# be prefixed to *both* command invocation and dependencies.
295#
296# Note: We also print the filenames in the quiet_cmd_foo text, and
297# perhaps ought to have a version specially escaped for that purpose.
298# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
299# enough. It'll strip the quotes in the common case where there's no
300# space and it's a simple filename, and it'll retain the quotes when
301# there's a space. There are some esoteric cases in which it'll print
302# the wrong thing, but we don't really care. The actual dependencies
303# and commands *do* get it right, with various combinations of single
304# and double quotes, backslashes and spaces in the filenames.
305#
306###############################################################################
307#
308define config_filename
309ifneq ($$(CONFIG_$(1)),"")
310$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
311ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
312else
313ifeq ($$(wildcard $$($(1)_FILENAME)),)
314ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
315$(1)_SRCPREFIX := $(srctree)/
316endif
317endif
318endif
319endif
320endef
321#
322###############################################################################
323
324# delete partially updated (i.e. corrupted) files on error
325.DELETE_ON_ERROR:
326
327# do not delete intermediate files automatically
328.SECONDARY: