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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-name
132# Expands to either gcc or clang
133cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
134
135# cc-version
136cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
137
138# cc-fullversion
139cc-fullversion = $(shell $(CONFIG_SHELL) \
140 $(srctree)/scripts/gcc-version.sh -p $(CC))
141
142# cc-ifversion
143# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
144cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
145
146# cc-ldoption
147# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
148cc-ldoption = $(call try-run,\
149 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
150
151# ld-option
152# Usage: LDFLAGS += $(call ld-option, -X)
153ld-option = $(call try-run,\
154 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
155
156# ar-option
157# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
158# Important: no spaces around options
159ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
160
161# ld-version
162# Note this is mainly for HJ Lu's 3 number binutil versions
163ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
164
165# ld-ifversion
166# Usage: $(call ld-ifversion, -ge, 22252, y)
167ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
168
169######
170
171###
172# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
173# Usage:
174# $(Q)$(MAKE) $(build)=dir
175build := -f $(srctree)/scripts/Makefile.build obj
176
177###
178# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
179# Usage:
180# $(Q)$(MAKE) $(modbuiltin)=dir
181modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
182
183###
184# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
185# Usage:
186# $(Q)$(MAKE) $(dtbinst)=dir
187dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
188
189###
190# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
191# Usage:
192# $(Q)$(MAKE) $(clean)=dir
193clean := -f $(srctree)/scripts/Makefile.clean obj
194
195###
196# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
197# Usage:
198# $(Q)$(MAKE) $(hdr-inst)=dir
199hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
200
201# Prefix -I with $(srctree) if it is not an absolute path.
202# skip if -I has no parameter
203addtree = $(if $(patsubst -I%,%,$(1)), \
204$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
205
206# Find all -I options and call addtree
207flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
208
209# echo command.
210# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
211echo-cmd = $(if $($(quiet)cmd_$(1)),\
212 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
213
214# printing commands
215cmd = @$(echo-cmd) $(cmd_$(1))
216
217# Add $(obj)/ for paths that are not absolute
218objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
219
220###
221# if_changed - execute command if any prerequisite is newer than
222# target, or command line has changed
223# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
224# including used config symbols
225# if_changed_rule - as if_changed but execute rule instead
226# See Documentation/kbuild/makefiles.txt for more info
227
228ifneq ($(KBUILD_NOCMDDEP),1)
229# Check if both arguments has same arguments. Result is empty string if equal.
230# User may override this check using make KBUILD_NOCMDDEP=1
231arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
232 $(filter-out $(cmd_$@), $(cmd_$(1))) )
233else
234arg-check = $(if $(strip $(cmd_$@)),,1)
235endif
236
237# Replace >$< with >$$< to preserve $ when reloading the .cmd file
238# (needed for make)
239# Replace >#< with >\#< to avoid starting a comment in the .cmd file
240# (needed for make)
241# Replace >'< with >'\''< to be able to enclose the whole string in '...'
242# (needed for the shell)
243make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
244
245# Find any prerequisites that is newer than target or that does not exist.
246# PHONY targets skipped in both cases.
247any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
248
249# Execute command if command has changed or prerequisite(s) are updated.
250#
251if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
252 @set -e; \
253 $(echo-cmd) $(cmd_$(1)); \
254 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
255
256# Execute the command and also postprocess generated .d dependencies file.
257if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
258 @set -e; \
259 $(echo-cmd) $(cmd_$(1)); \
260 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
261 rm -f $(depfile); \
262 mv -f $(dot-target).tmp $(dot-target).cmd, @:)
263
264# Usage: $(call if_changed_rule,foo)
265# Will check if $(cmd_foo) or any of the prerequisites changed,
266# and if so will execute $(rule_foo).
267if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
268 @set -e; \
269 $(rule_$(1)), @:)
270
271###
272# why - tell why a a target got build
273# enabled by make V=2
274# Output (listed in the order they are checked):
275# (1) - due to target is PHONY
276# (2) - due to target missing
277# (3) - due to: file1.h file2.h
278# (4) - due to command line change
279# (5) - due to missing .cmd file
280# (6) - due to target not in $(targets)
281# (1) PHONY targets are always build
282# (2) No target, so we better build it
283# (3) Prerequisite is newer than target
284# (4) The command line stored in the file named dir/.target.cmd
285# differed from actual command line. This happens when compiler
286# options changes
287# (5) No dir/.target.cmd file (used to store command line)
288# (6) No dir/.target.cmd file and target not listed in $(targets)
289# This is a good hint that there is a bug in the kbuild file
290ifeq ($(KBUILD_VERBOSE),2)
291why = \
292 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
293 $(if $(wildcard $@), \
294 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
295 $(if $(arg-check), \
296 $(if $(cmd_$@),- due to command line change, \
297 $(if $(filter $@, $(targets)), \
298 - due to missing .cmd file, \
299 - due to $(notdir $@) not in $$(targets) \
300 ) \
301 ) \
302 ) \
303 ), \
304 - due to target missing \
305 ) \
306 )
307
308echo-why = $(call escsq, $(strip $(why)))
309endif
310
311###############################################################################
312#
313# When a Kconfig string contains a filename, it is suitable for
314# passing to shell commands. It is surrounded by double-quotes, and
315# any double-quotes or backslashes within it are escaped by
316# backslashes.
317#
318# This is no use for dependencies or $(wildcard). We need to strip the
319# surrounding quotes and the escaping from quotes and backslashes, and
320# we *do* need to escape any spaces in the string. So, for example:
321#
322# Usage: $(eval $(call config_filename,FOO))
323#
324# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
325# transformed as described above to be suitable for use within the
326# makefile.
327#
328# Also, if the filename is a relative filename and exists in the source
329# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
330# be prefixed to *both* command invocation and dependencies.
331#
332# Note: We also print the filenames in the quiet_cmd_foo text, and
333# perhaps ought to have a version specially escaped for that purpose.
334# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
335# enough. It'll strip the quotes in the common case where there's no
336# space and it's a simple filename, and it'll retain the quotes when
337# there's a space. There are some esoteric cases in which it'll print
338# the wrong thing, but we don't really care. The actual dependencies
339# and commands *do* get it right, with various combinations of single
340# and double quotes, backslashes and spaces in the filenames.
341#
342###############################################################################
343#
344space_escape := %%%SPACE%%%
345#
346define config_filename
347ifneq ($$(CONFIG_$(1)),"")
348$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
349ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
350else
351ifeq ($$(wildcard $$($(1)_FILENAME)),)
352ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
353$(1)_SRCPREFIX := $(srctree)/
354endif
355endif
356endif
357endif
358endef
359#
360###############################################################################
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 := \#
13define newline
14
15
16endef
17
18###
19# Comparison macros.
20# Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000)
21#
22# Use $(intcmp ...) if supported. (Make >= 4.4)
23# Otherwise, fall back to the 'test' shell command.
24ifeq ($(intcmp 1,0,,,y),y)
25test-ge = $(intcmp $(strip $1)0, $(strip $2)0,,y,y)
26test-gt = $(intcmp $(strip $1)0, $(strip $2)0,,,y)
27else
28test-ge = $(shell test $(strip $1)0 -ge $(strip $2)0 && echo y)
29test-gt = $(shell test $(strip $1)0 -gt $(strip $2)0 && echo y)
30endif
31test-le = $(call test-ge, $2, $1)
32test-lt = $(call test-gt, $2, $1)
33
34###
35# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
36dot-target = $(dir $@).$(notdir $@)
37
38###
39# Name of target with a '.tmp_' as filename prefix. foo/bar.o => foo/.tmp_bar.o
40tmp-target = $(dir $@).tmp_$(notdir $@)
41
42###
43# The temporary file to save gcc -MMD generated dependencies must not
44# contain a comma
45depfile = $(subst $(comma),_,$(dot-target).d)
46
47###
48# filename of target with directory and extension stripped
49basetarget = $(basename $(notdir $@))
50
51###
52# real prerequisites without phony targets
53real-prereqs = $(filter-out $(PHONY), $^)
54
55###
56# Escape single quote for use in echo statements
57escsq = $(subst $(squote),'\$(squote)',$1)
58
59###
60# Quote a string to pass it to C files. foo => '"foo"'
61stringify = $(squote)$(quote)$1$(quote)$(squote)
62
63###
64# The path to Kbuild or Makefile. Kbuild has precedence over Makefile.
65kbuild-dir = $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
66kbuild-file = $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
67
68###
69# Read a file, replacing newlines with spaces
70#
71# Make 4.2 or later can read a file by using its builtin function.
72ifneq ($(filter-out 3.% 4.0 4.1, $(MAKE_VERSION)),)
73read-file = $(subst $(newline),$(space),$(file < $1))
74else
75read-file = $(shell cat $1 2>/dev/null)
76endif
77
78###
79# Easy method for doing a status message
80 kecho := :
81 quiet_kecho := echo
82silent_kecho := :
83kecho := $($(quiet)kecho)
84
85###
86# filechk is used to check if the content of a generated file is updated.
87# Sample usage:
88#
89# filechk_sample = echo $(KERNELRELEASE)
90# version.h: FORCE
91# $(call filechk,sample)
92#
93# The rule defined shall write to stdout the content of the new file.
94# The existing file will be compared with the new one.
95# - If no file exist it is created
96# - If the content differ the new file is used
97# - If they are equal no change, and no timestamp update
98define filechk
99 $(check-FORCE)
100 $(Q)set -e; \
101 mkdir -p $(dir $@); \
102 trap "rm -f $(dot-target).tmp" EXIT; \
103 { $(filechk_$(1)); } > $(dot-target).tmp; \
104 if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \
105 $(kecho) ' UPD $@'; \
106 mv -f $(dot-target).tmp $@; \
107 fi
108endef
109
110###
111# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
112# Usage:
113# $(Q)$(MAKE) $(build)=dir
114build := -f $(srctree)/scripts/Makefile.build obj
115
116###
117# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
118# Usage:
119# $(Q)$(MAKE) $(dtbinst)=dir
120dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
121
122###
123# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
124# Usage:
125# $(Q)$(MAKE) $(clean)=dir
126clean := -f $(srctree)/scripts/Makefile.clean obj
127
128# echo command.
129# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
130echo-cmd = $(if $($(quiet)cmd_$(1)),\
131 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
132
133# sink stdout for 'make -s'
134 redirect :=
135 quiet_redirect :=
136silent_redirect := exec >/dev/null;
137
138# Delete the target on interruption
139#
140# GNU Make automatically deletes the target if it has already been changed by
141# the interrupted recipe. So, you can safely stop the build by Ctrl-C (Make
142# will delete incomplete targets), and resume it later.
143#
144# However, this does not work when the stderr is piped to another program, like
145# $ make >&2 | tee log
146# Make dies with SIGPIPE before cleaning the targets.
147#
148# To address it, we clean the target in signal traps.
149#
150# Make deletes the target when it catches SIGHUP, SIGINT, SIGQUIT, SIGTERM.
151# So, we cover them, and also SIGPIPE just in case.
152#
153# Of course, this is unneeded for phony targets.
154delete-on-interrupt = \
155 $(if $(filter-out $(PHONY), $@), \
156 $(foreach sig, HUP INT QUIT TERM PIPE, \
157 trap 'rm -f $@; trap - $(sig); kill -s $(sig) $$$$' $(sig);))
158
159# printing commands
160cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(delete-on-interrupt) $(cmd_$(1))
161
162###
163# if_changed - execute command if any prerequisite is newer than
164# target, or command line has changed
165# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
166# including used config symbols
167# if_changed_rule - as if_changed but execute rule instead
168# See Documentation/kbuild/makefiles.rst for more info
169
170ifneq ($(KBUILD_NOCMDDEP),1)
171# Check if both commands are the same including their order. Result is empty
172# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
173cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
174 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
175else
176cmd-check = $(if $(strip $(cmd_$@)),,1)
177endif
178
179# Replace >$< with >$$< to preserve $ when reloading the .cmd file
180# (needed for make)
181# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
182# (needed for make)
183# Replace >'< with >'\''< to be able to enclose the whole string in '...'
184# (needed for the shell)
185make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
186
187# Find any prerequisites that are newer than target or that do not exist.
188# PHONY targets skipped in both cases.
189newer-prereqs = $(filter-out $(PHONY),$?)
190
191# It is a typical mistake to forget the FORCE prerequisite. Check it here so
192# no more breakage will slip in.
193check-FORCE = $(if $(filter FORCE, $^),,$(warning FORCE prerequisite is missing))
194
195if-changed-cond = $(newer-prereqs)$(cmd-check)$(check-FORCE)
196
197# Execute command if command has changed or prerequisite(s) are updated.
198if_changed = $(if $(if-changed-cond),$(cmd_and_savecmd),@:)
199
200cmd_and_savecmd = \
201 $(cmd); \
202 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd
203
204# Execute the command and also postprocess generated .d dependencies file.
205if_changed_dep = $(if $(if-changed-cond),$(cmd_and_fixdep),@:)
206
207cmd_and_fixdep = \
208 $(cmd); \
209 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
210 rm -f $(depfile)
211
212# Usage: $(call if_changed_rule,foo)
213# Will check if $(cmd_foo) or any of the prerequisites changed,
214# and if so will execute $(rule_foo).
215if_changed_rule = $(if $(if-changed-cond),$(rule_$(1)),@:)
216
217###
218# why - tell why a target got built
219# enabled by make V=2
220# Output (listed in the order they are checked):
221# (1) - due to target is PHONY
222# (2) - due to target missing
223# (3) - due to: file1.h file2.h
224# (4) - due to command line change
225# (5) - due to missing .cmd file
226# (6) - due to target not in $(targets)
227# (1) PHONY targets are always build
228# (2) No target, so we better build it
229# (3) Prerequisite is newer than target
230# (4) The command line stored in the file named dir/.target.cmd
231# differed from actual command line. This happens when compiler
232# options changes
233# (5) No dir/.target.cmd file (used to store command line)
234# (6) No dir/.target.cmd file and target not listed in $(targets)
235# This is a good hint that there is a bug in the kbuild file
236ifeq ($(KBUILD_VERBOSE),2)
237why = \
238 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
239 $(if $(wildcard $@), \
240 $(if $(newer-prereqs),- due to: $(newer-prereqs), \
241 $(if $(cmd-check), \
242 $(if $(cmd_$@),- due to command line change, \
243 $(if $(filter $@, $(targets)), \
244 - due to missing .cmd file, \
245 - due to $(notdir $@) not in $$(targets) \
246 ) \
247 ) \
248 ) \
249 ), \
250 - due to target missing \
251 ) \
252 )
253
254echo-why = $(call escsq, $(strip $(why)))
255endif
256
257###############################################################################
258
259# delete partially updated (i.e. corrupted) files on error
260.DELETE_ON_ERROR:
261
262# do not delete intermediate files automatically
263#
264# .NOTINTERMEDIATE is more correct, but only available on newer Make versions.
265# Make 4.4 introduced .NOTINTERMEDIATE, and it appears in .FEATURES, but the
266# global .NOTINTERMEDIATE does not work. We can use it on Make > 4.4.
267# Use .SECONDARY for older Make versions, but "newer-prereq" cannot detect
268# deleted files.
269ifneq ($(and $(filter notintermediate, $(.FEATURES)),$(filter-out 4.4,$(MAKE_VERSION))),)
270.NOTINTERMEDIATE:
271else
272.SECONDARY:
273endif