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