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1####
2# kbuild: Generic definitions
3
4# Convenient variables
5comma := ,
6quote := "
7squote := '
8empty :=
9space := $(empty) $(empty)
10
11###
12# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
13dot-target = $(dir $@).$(notdir $@)
14
15###
16# The temporary file to save gcc -MD generated dependencies must not
17# contain a comma
18depfile = $(subst $(comma),_,$(dot-target).d)
19
20###
21# filename of target with directory and extension stripped
22basetarget = $(basename $(notdir $@))
23
24###
25# filename of first prerequisite with directory and extension stripped
26baseprereq = $(basename $(notdir $<))
27
28###
29# Escape single quote for use in echo statements
30escsq = $(subst $(squote),'\$(squote)',$1)
31
32###
33# Easy method for doing a status message
34 kecho := :
35 quiet_kecho := echo
36silent_kecho := :
37kecho := $($(quiet)kecho)
38
39###
40# filechk is used to check if the content of a generated file is updated.
41# Sample usage:
42# define filechk_sample
43# echo $KERNELRELEASE
44# endef
45# version.h : Makefile
46# $(call filechk,sample)
47# The rule defined shall write to stdout the content of the new file.
48# The existing file will be compared with the new one.
49# - If no file exist it is created
50# - If the content differ the new file is used
51# - If they are equal no change, and no timestamp update
52# - stdin is piped in from the first prerequisite ($<) so one has
53# to specify a valid file as first prerequisite (often the kbuild file)
54define filechk
55 $(Q)set -e; \
56 $(kecho) ' CHK $@'; \
57 mkdir -p $(dir $@); \
58 $(filechk_$(1)) < $< > $@.tmp; \
59 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
60 rm -f $@.tmp; \
61 else \
62 $(kecho) ' UPD $@'; \
63 mv -f $@.tmp $@; \
64 fi
65endef
66
67######
68# gcc support functions
69# See documentation in Documentation/kbuild/makefiles.txt
70
71# cc-cross-prefix
72# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
73# Return first prefix where a prefix$(CC) is found in PATH.
74# If no $(CC) found in PATH with listed prefixes return nothing
75cc-cross-prefix = \
76 $(word 1, $(foreach c,$(1), \
77 $(shell set -e; \
78 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
79 echo $(c); \
80 fi)))
81
82# output directory for tests below
83TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
84
85# try-run
86# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
87# Exit code chooses option. "$$TMP" is can be used as temporary file and
88# is automatically cleaned up.
89try-run = $(shell set -e; \
90 TMP="$(TMPOUT).$$$$.tmp"; \
91 TMPO="$(TMPOUT).$$$$.o"; \
92 if ($(1)) >/dev/null 2>&1; \
93 then echo "$(2)"; \
94 else echo "$(3)"; \
95 fi; \
96 rm -f "$$TMP" "$$TMPO")
97
98# as-option
99# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
100
101as-option = $(call try-run,\
102 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
103
104# as-instr
105# Usage: cflags-y += $(call as-instr,instr,option1,option2)
106
107as-instr = $(call try-run,\
108 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
109
110# cc-option
111# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
112
113cc-option = $(call try-run,\
114 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
115
116# cc-option-yn
117# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
118cc-option-yn = $(call try-run,\
119 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
120
121# cc-option-align
122# Prefix align with either -falign or -malign
123cc-option-align = $(subst -functions=0,,\
124 $(call cc-option,-falign-functions=0,-malign-functions=0))
125
126# cc-disable-warning
127# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
128cc-disable-warning = $(call try-run,\
129 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
130
131# cc-version
132# Usage gcc-ver := $(call cc-version)
133cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
134
135# cc-fullversion
136# Usage gcc-ver := $(call cc-fullversion)
137cc-fullversion = $(shell $(CONFIG_SHELL) \
138 $(srctree)/scripts/gcc-version.sh -p $(CC))
139
140# cc-ifversion
141# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
142cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
143
144# cc-ldoption
145# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
146cc-ldoption = $(call try-run,\
147 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
148
149# ld-option
150# Usage: LDFLAGS += $(call ld-option, -X)
151ld-option = $(call try-run,\
152 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
153
154# ar-option
155# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
156# Important: no spaces around options
157ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
158
159# ld-version
160# Usage: $(call ld-version)
161# Note this is mainly for HJ Lu's 3 number binutil versions
162ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
163
164# ld-ifversion
165# Usage: $(call ld-ifversion, -ge, 22252, y)
166ld-ifversion = $(shell [ $(call ld-version) $(1) $(2) ] && echo $(3))
167
168######
169
170###
171# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
172# Usage:
173# $(Q)$(MAKE) $(build)=dir
174build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
175
176###
177# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
178# Usage:
179# $(Q)$(MAKE) $(modbuiltin)=dir
180modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
181
182# Prefix -I with $(srctree) if it is not an absolute path.
183# skip if -I has no parameter
184addtree = $(if $(patsubst -I%,%,$(1)), \
185$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
186
187# Find all -I options and call addtree
188flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
189
190# echo command.
191# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
192echo-cmd = $(if $($(quiet)cmd_$(1)),\
193 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
194
195# printing commands
196cmd = @$(echo-cmd) $(cmd_$(1))
197
198# Add $(obj)/ for paths that are not absolute
199objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
200
201###
202# if_changed - execute command if any prerequisite is newer than
203# target, or command line has changed
204# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
205# including used config symbols
206# if_changed_rule - as if_changed but execute rule instead
207# See Documentation/kbuild/makefiles.txt for more info
208
209ifneq ($(KBUILD_NOCMDDEP),1)
210# Check if both arguments has same arguments. Result is empty string if equal.
211# User may override this check using make KBUILD_NOCMDDEP=1
212arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
213 $(filter-out $(cmd_$@), $(cmd_$(1))) )
214else
215arg-check = $(if $(strip $(cmd_$@)),,1)
216endif
217
218# >'< substitution is for echo to work,
219# >$< substitution to preserve $ when reloading .cmd file
220# note: when using inline perl scripts [perl -e '...$$t=1;...']
221# in $(cmd_xxx) double $$ your perl vars
222make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))))
223
224# Find any prerequisites that is newer than target or that does not exist.
225# PHONY targets skipped in both cases.
226any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
227
228# Execute command if command has changed or prerequisite(s) are updated.
229#
230if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
231 @set -e; \
232 $(echo-cmd) $(cmd_$(1)); \
233 echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
234
235# Execute the command and also postprocess generated .d dependencies file.
236if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
237 @set -e; \
238 $(echo-cmd) $(cmd_$(1)); \
239 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
240 rm -f $(depfile); \
241 mv -f $(dot-target).tmp $(dot-target).cmd)
242
243# Usage: $(call if_changed_rule,foo)
244# Will check if $(cmd_foo) or any of the prerequisites changed,
245# and if so will execute $(rule_foo).
246if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
247 @set -e; \
248 $(rule_$(1)))
249
250###
251# why - tell why a a target got build
252# enabled by make V=2
253# Output (listed in the order they are checked):
254# (1) - due to target is PHONY
255# (2) - due to target missing
256# (3) - due to: file1.h file2.h
257# (4) - due to command line change
258# (5) - due to missing .cmd file
259# (6) - due to target not in $(targets)
260# (1) PHONY targets are always build
261# (2) No target, so we better build it
262# (3) Prerequisite is newer than target
263# (4) The command line stored in the file named dir/.target.cmd
264# differed from actual command line. This happens when compiler
265# options changes
266# (5) No dir/.target.cmd file (used to store command line)
267# (6) No dir/.target.cmd file and target not listed in $(targets)
268# This is a good hint that there is a bug in the kbuild file
269ifeq ($(KBUILD_VERBOSE),2)
270why = \
271 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
272 $(if $(wildcard $@), \
273 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
274 $(if $(arg-check), \
275 $(if $(cmd_$@),- due to command line change, \
276 $(if $(filter $@, $(targets)), \
277 - due to missing .cmd file, \
278 - due to $(notdir $@) not in $$(targets) \
279 ) \
280 ) \
281 ) \
282 ), \
283 - due to target missing \
284 ) \
285 )
286
287echo-why = $(call escsq, $(strip $(why)))
288endif
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: