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8ec4b4ff
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1####
2# kbuild: Generic definitions
3
beda9f3a 4# Convenient variables
8ec4b4ff 5comma := ,
13338935 6quote := "
d51bfb78 7squote := '
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8empty :=
9space := $(empty) $(empty)
9c8fa9bc 10space_escape := _-_SPACE_-_
8ec4b4ff 11
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12###
13# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
14dot-target = $(dir $@).$(notdir $@)
15
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16###
17# The temporary file to save gcc -MD generated dependencies must not
18# contain a comma
48f1f058 19depfile = $(subst $(comma),_,$(dot-target).d)
8ec4b4ff 20
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21###
22# filename of target with directory and extension stripped
23basetarget = $(basename $(notdir $@))
24
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25###
26# filename of first prerequisite with directory and extension stripped
27baseprereq = $(basename $(notdir $<))
28
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29###
30# Escape single quote for use in echo statements
31escsq = $(subst $(squote),'\$(squote)',$1)
32
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33###
34# Easy method for doing a status message
35 kecho := :
36 quiet_kecho := echo
37silent_kecho := :
38kecho := $($(quiet)kecho)
39
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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; \
fd54f502 57 $(kecho) ' CHK $@'; \
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58 mkdir -p $(dir $@); \
59 $(filechk_$(1)) < $< > $@.tmp; \
60 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
61 rm -f $@.tmp; \
62 else \
fd54f502 63 $(kecho) ' UPD $@'; \
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64 mv -f $@.tmp $@; \
65 fi
66endef
67
20a468b5 68######
9d6e7a70 69# gcc support functions
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70# See documentation in Documentation/kbuild/makefiles.txt
71
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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
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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).$$$$.tmp"; \
691ef3e7 92 TMPO="$(TMPOUT).$$$$.o"; \
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93 if ($(1)) >/dev/null 2>&1; \
94 then echo "$(2)"; \
95 else echo "$(3)"; \
96 fi; \
691ef3e7 97 rm -f "$$TMP" "$$TMPO")
347a00fb 98
20a468b5 99# as-option
bff288c1 100# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
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101
102as-option = $(call try-run,\
b1e0d8b7 103 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
20a468b5 104
e2414910 105# as-instr
bff288c1 106# Usage: cflags-y += $(call as-instr,instr,option1,option2)
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107
108as-instr = $(call try-run,\
b1e0d8b7 109 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
e2414910 110
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111# __cc-option
112# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
113__cc-option = $(call try-run,\
114 $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
115
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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.)
118CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
119
20a468b5 120# cc-option
bff288c1 121# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
beda9f3a 122
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123cc-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)
128hostcc-option = $(call __cc-option, $(HOSTCC),\
129 $(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
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130
131# cc-option-yn
bff288c1 132# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
beda9f3a 133cc-option-yn = $(call try-run,\
c3f0d0bc 134 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
20a468b5 135
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136# cc-disable-warning
137# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
138cc-disable-warning = $(call try-run,\
c3f0d0bc 139 $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
8417da6f 140
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141# cc-name
142# Expands to either gcc or clang
143cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
144
20a468b5 145# cc-version
8eb3afe0 146cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
20a468b5 147
0ab2a272 148# cc-fullversion
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149cc-fullversion = $(shell $(CONFIG_SHELL) \
150 $(srctree)/scripts/gcc-version.sh -p $(CC))
151
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152# cc-ifversion
153# Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
6dcb4e5e 154cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
20a468b5 155
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156# cc-if-fullversion
157# Usage: EXTRA_CFLAGS += $(call cc-if-fullversion, -lt, 040502, -O1)
158cc-if-fullversion = $(shell [ $(cc-fullversion) $(1) $(2) ] && echo $(3) || echo $(4))
159
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160# cc-ldoption
161# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
162cc-ldoption = $(call try-run,\
b1e0d8b7 163 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
5de043f4 164
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165# ld-option
166# Usage: LDFLAGS += $(call ld-option, -X)
167ld-option = $(call try-run,\
5b83df2b 168 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
691ef3e7 169
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170# ar-option
171# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
172# Important: no spaces around options
173ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
174
ccbef167 175# ld-version
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176# Note this is mainly for HJ Lu's 3 number binutil versions
177ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
178
179# ld-ifversion
180# Usage: $(call ld-ifversion, -ge, 22252, y)
6dcb4e5e 181ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
ccbef167 182
5de043f4 183######
0b0bf7a3 184
beda9f3a 185###
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186# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
187# Usage:
188# $(Q)$(MAKE) $(build)=dir
5b2389b4 189build := -f $(srctree)/scripts/Makefile.build obj
8ec4b4ff 190
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191###
192# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
193# Usage:
194# $(Q)$(MAKE) $(modbuiltin)=dir
5b2389b4 195modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
bc081dd6 196
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197###
198# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
199# Usage:
200# $(Q)$(MAKE) $(dtbinst)=dir
201dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
202
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203###
204# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
205# Usage:
206# $(Q)$(MAKE) $(clean)=dir
207clean := -f $(srctree)/scripts/Makefile.clean obj
208
209###
1846dfbd 210# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
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211# Usage:
212# $(Q)$(MAKE) $(hdr-inst)=dir
1846dfbd 213hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
371fdc77 214
beda9f3a 215# Prefix -I with $(srctree) if it is not an absolute path.
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216# skip if -I has no parameter
217addtree = $(if $(patsubst -I%,%,$(1)), \
db547ef1 218$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
5de043f4 219
d9df92e2 220# Find all -I options and call addtree
beda9f3a 221flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
d9df92e2 222
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223# echo command.
224# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
bff288c1 225echo-cmd = $(if $($(quiet)cmd_$(1)),\
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226 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
227
228# printing commands
6176aa9a 229cmd = @$(echo-cmd) $(cmd_$(1))
8ec4b4ff 230
5de043f4 231# Add $(obj)/ for paths that are not absolute
bff288c1 232objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
0a504f25 233
8ec4b4ff 234###
5de043f4 235# if_changed - execute command if any prerequisite is newer than
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236# target, or command line has changed
237# if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
238# including used config symbols
239# if_changed_rule - as if_changed but execute rule instead
240# See Documentation/kbuild/makefiles.txt for more info
241
242ifneq ($(KBUILD_NOCMDDEP),1)
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243# Check if both arguments are the same including their order. Result is empty
244# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
245arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
246 $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
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247else
248arg-check = $(if $(strip $(cmd_$@)),,1)
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249endif
250
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251# Replace >$< with >$$< to preserve $ when reloading the .cmd file
252# (needed for make)
253# Replace >#< with >\#< to avoid starting a comment in the .cmd file
254# (needed for make)
255# Replace >'< with >'\''< to be able to enclose the whole string in '...'
256# (needed for the shell)
257make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
6176aa9a 258
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259# Find any prerequisites that is newer than target or that does not exist.
260# PHONY targets skipped in both cases.
261any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
262
5de043f4 263# Execute command if command has changed or prerequisite(s) are updated.
4f193362 264#
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265if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
266 @set -e; \
267 $(echo-cmd) $(cmd_$(1)); \
2aedcd09 268 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
8ec4b4ff 269
5de043f4 270# Execute the command and also postprocess generated .d dependencies file.
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271if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
272 @set -e; \
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273 $(cmd_and_fixdep), @:)
274
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275ifndef CONFIG_TRIM_UNUSED_KSYMS
276
e4aca459 277cmd_and_fixdep = \
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278 $(echo-cmd) $(cmd_$(1)); \
279 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
280 rm -f $(depfile); \
e4aca459 281 mv -f $(dot-target).tmp $(dot-target).cmd;
8ec4b4ff 282
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283else
284
285# Filter out exported kernel symbol names from the preprocessor output.
286# See also __KSYM_DEPS__ in include/linux/export.h.
287# We disable the depfile generation here, so as not to overwrite the existing
288# depfile while fixdep is parsing it.
289flags_nodeps = $(filter-out -Wp$(comma)-M%, $($(1)))
290ksym_dep_filter = \
291 case "$(1)" in \
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292 cc_*_c|cpp_i_c) \
293 $(CPP) $(call flags_nodeps,c_flags) -D__KSYM_DEPS__ $< ;; \
294 as_*_S|cpp_s_S) \
295 $(CPP) $(call flags_nodeps,a_flags) -D__KSYM_DEPS__ $< ;; \
0d070d2b 296 boot*|build*|cpp_its_S|*cpp_lds_S|dtc|host*|vdso*) : ;; \
366f4856 297 *) echo "Don't know how to preprocess $(1)" >&2; false ;; \
f110e0fe 298 esac | tr ";" "\n" | sed -rn 's/^.*=== __KSYM_(.*) ===.*$$/KSYM_\1/p'
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299
300cmd_and_fixdep = \
301 $(echo-cmd) $(cmd_$(1)); \
302 $(ksym_dep_filter) | \
303 scripts/basic/fixdep -e $(depfile) $@ '$(make-cmd)' \
304 > $(dot-target).tmp; \
305 rm -f $(depfile); \
306 mv -f $(dot-target).tmp $(dot-target).cmd;
307
308endif
309
8ec4b4ff 310# Usage: $(call if_changed_rule,foo)
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311# Will check if $(cmd_foo) or any of the prerequisites changed,
312# and if so will execute $(rule_foo).
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313if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
314 @set -e; \
2aedcd09 315 $(rule_$(1)), @:)
48f1f058 316
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317###
318# why - tell why a a target got build
319# enabled by make V=2
320# Output (listed in the order they are checked):
321# (1) - due to target is PHONY
322# (2) - due to target missing
323# (3) - due to: file1.h file2.h
324# (4) - due to command line change
325# (5) - due to missing .cmd file
326# (6) - due to target not in $(targets)
327# (1) PHONY targets are always build
328# (2) No target, so we better build it
329# (3) Prerequisite is newer than target
330# (4) The command line stored in the file named dir/.target.cmd
331# differed from actual command line. This happens when compiler
332# options changes
333# (5) No dir/.target.cmd file (used to store command line)
334# (6) No dir/.target.cmd file and target not listed in $(targets)
335# This is a good hint that there is a bug in the kbuild file
336ifeq ($(KBUILD_VERBOSE),2)
337why = \
338 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
339 $(if $(wildcard $@), \
340 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
341 $(if $(arg-check), \
342 $(if $(cmd_$@),- due to command line change, \
343 $(if $(filter $@, $(targets)), \
344 - due to missing .cmd file, \
345 - due to $(notdir $@) not in $$(targets) \
346 ) \
347 ) \
348 ) \
349 ), \
350 - due to target missing \
351 ) \
352 )
353
354echo-why = $(call escsq, $(strip $(why)))
355endif
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356
357###############################################################################
358#
359# When a Kconfig string contains a filename, it is suitable for
360# passing to shell commands. It is surrounded by double-quotes, and
361# any double-quotes or backslashes within it are escaped by
362# backslashes.
363#
364# This is no use for dependencies or $(wildcard). We need to strip the
365# surrounding quotes and the escaping from quotes and backslashes, and
366# we *do* need to escape any spaces in the string. So, for example:
367#
368# Usage: $(eval $(call config_filename,FOO))
369#
370# Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
371# transformed as described above to be suitable for use within the
372# makefile.
373#
374# Also, if the filename is a relative filename and exists in the source
375# tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
376# be prefixed to *both* command invocation and dependencies.
377#
378# Note: We also print the filenames in the quiet_cmd_foo text, and
379# perhaps ought to have a version specially escaped for that purpose.
380# But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
381# enough. It'll strip the quotes in the common case where there's no
382# space and it's a simple filename, and it'll retain the quotes when
383# there's a space. There are some esoteric cases in which it'll print
384# the wrong thing, but we don't really care. The actual dependencies
385# and commands *do* get it right, with various combinations of single
386# and double quotes, backslashes and spaces in the filenames.
387#
388###############################################################################
389#
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390define config_filename
391ifneq ($$(CONFIG_$(1)),"")
392$(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
393ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
394else
395ifeq ($$(wildcard $$($(1)_FILENAME)),)
396ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
397$(1)_SRCPREFIX := $(srctree)/
398endif
399endif
400endif
401endif
402endef
403#
404###############################################################################