2 # kbuild: Generic definitions
10 space := $(empty) $(empty)
13 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
14 dot-target = $(dir $@).$(notdir $@)
17 # The temporary file to save gcc -MD generated dependencies must not
19 depfile = $(subst $(comma),_,$(dot-target).d)
22 # The conversion of .. to the _ddot_ to avoid any relative path to be
23 # outside of out folder.
24 replace_ddot = $(subst $(double_dot),_ddot_,$(1))
27 # filename of target with directory and extension stripped
28 basetarget = $(basename $(notdir $@))
31 # filename of first prerequisite with directory and extension stripped
32 baseprereq = $(basename $(notdir $<))
35 # Escape single quote for use in echo statements
36 escsq = $(subst $(squote),'\$(squote)',$1)
39 # Easy method for doing a status message
43 kecho := $($(quiet)kecho)
46 # filechk is used to check if the content of a generated file is updated.
48 # define filechk_sample
51 # version.h : Makefile
52 # $(call filechk,sample)
53 # The rule defined shall write to stdout the content of the new file.
54 # The existing file will be compared with the new one.
55 # - If no file exist it is created
56 # - If the content differ the new file is used
57 # - If they are equal no change, and no timestamp update
58 # - stdin is piped in from the first prerequisite ($<) so one has
59 # to specify a valid file as first prerequisite (often the kbuild file)
64 $(filechk_$(1)) < $< > $@.tmp; \
65 if [ -r $@ ] && cmp -s $@ $@.tmp; then \
74 # gcc support functions
75 # See documentation in Documentation/kbuild/makefiles.txt
78 # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
79 # Return first prefix where a prefix$(CC) is found in PATH.
80 # If no $(CC) found in PATH with listed prefixes return nothing
82 $(word 1, $(foreach c,$(1), \
84 if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
88 # output directory for tests below
89 TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
92 # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
93 # Exit code chooses option. "$$TMP" is can be used as temporary file and
94 # is automatically cleaned up.
95 try-run = $(shell set -e; \
96 TMP="$(TMPOUT).$$$$.tmp"; \
97 TMPO="$(TMPOUT).$$$$.o"; \
98 if ($(1)) >/dev/null 2>&1; \
102 rm -f "$$TMP" "$$TMPO")
105 # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
107 as-option = $(call try-run,\
108 $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
111 # Usage: cflags-y += $(call as-instr,instr,option1,option2)
113 as-instr = $(call try-run,\
114 printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
117 # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
119 cc-option = $(call try-run,\
120 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
123 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
124 cc-option-yn = $(call try-run,\
125 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
128 # Prefix align with either -falign or -malign
129 cc-option-align = $(subst -functions=0,,\
130 $(call cc-option,-falign-functions=0,-malign-functions=0))
133 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
134 cc-disable-warning = $(call try-run,\
135 $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
138 # Expands to either gcc or clang
139 cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
142 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
145 cc-fullversion = $(shell $(CONFIG_SHELL) \
146 $(srctree)/scripts/gcc-version.sh -p $(CC))
149 # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
150 cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
153 # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
154 cc-ldoption = $(call try-run,\
155 $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
158 # Usage: LDFLAGS += $(call ld-option, -X)
159 ld-option = $(call try-run,\
160 $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
163 # Usage: KBUILD_ARFLAGS := $(call ar-option,D)
164 # Important: no spaces around options
165 ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
168 # Note this is mainly for HJ Lu's 3 number binutil versions
169 ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
172 # Usage: $(call ld-ifversion, -ge, 22252, y)
173 ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
178 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
180 # $(Q)$(MAKE) $(build)=dir
181 build := -f $(srctree)/scripts/Makefile.build obj
184 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
186 # $(Q)$(MAKE) $(modbuiltin)=dir
187 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
190 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
192 # $(Q)$(MAKE) $(dtbinst)=dir
193 dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
196 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
198 # $(Q)$(MAKE) $(clean)=dir
199 clean := -f $(srctree)/scripts/Makefile.clean obj
202 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
204 # $(Q)$(MAKE) $(hdr-inst)=dir
205 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
207 # Prefix -I with $(srctree) if it is not an absolute path.
208 # skip if -I has no parameter
209 addtree = $(if $(patsubst -I%,%,$(1)), \
210 $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
212 # Find all -I options and call addtree
213 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
216 # Short version is used, if $(quiet) equals `quiet_', otherwise full one.
217 echo-cmd = $(if $($(quiet)cmd_$(1)),\
218 echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
221 cmd = @$(echo-cmd) $(cmd_$(1))
223 # Add $(obj)/ for paths that are not absolute
224 objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
227 # if_changed - execute command if any prerequisite is newer than
228 # target, or command line has changed
229 # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies
230 # including used config symbols
231 # if_changed_rule - as if_changed but execute rule instead
232 # See Documentation/kbuild/makefiles.txt for more info
234 ifneq ($(KBUILD_NOCMDDEP),1)
235 # Check if both arguments has same arguments. Result is empty string if equal.
236 # User may override this check using make KBUILD_NOCMDDEP=1
237 arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
238 $(filter-out $(cmd_$@), $(cmd_$(1))) )
240 arg-check = $(if $(strip $(cmd_$@)),,1)
243 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
245 # Replace >#< with >\#< to avoid starting a comment in the .cmd file
247 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
248 # (needed for the shell)
249 make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
251 # Find any prerequisites that is newer than target or that does not exist.
252 # PHONY targets skipped in both cases.
253 any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
255 # Execute command if command has changed or prerequisite(s) are updated.
257 if_changed = $(if $(strip $(any-prereq) $(arg-check)), \
259 $(echo-cmd) $(cmd_$(1)); \
260 printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
262 # Execute the command and also postprocess generated .d dependencies file.
263 if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \
265 $(echo-cmd) $(cmd_$(1)); \
266 scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
268 mv -f $(dot-target).tmp $(dot-target).cmd)
270 # Usage: $(call if_changed_rule,foo)
271 # Will check if $(cmd_foo) or any of the prerequisites changed,
272 # and if so will execute $(rule_foo).
273 if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \
278 # why - tell why a a target got build
279 # enabled by make V=2
280 # Output (listed in the order they are checked):
281 # (1) - due to target is PHONY
282 # (2) - due to target missing
283 # (3) - due to: file1.h file2.h
284 # (4) - due to command line change
285 # (5) - due to missing .cmd file
286 # (6) - due to target not in $(targets)
287 # (1) PHONY targets are always build
288 # (2) No target, so we better build it
289 # (3) Prerequisite is newer than target
290 # (4) The command line stored in the file named dir/.target.cmd
291 # differed from actual command line. This happens when compiler
293 # (5) No dir/.target.cmd file (used to store command line)
294 # (6) No dir/.target.cmd file and target not listed in $(targets)
295 # This is a good hint that there is a bug in the kbuild file
296 ifeq ($(KBUILD_VERBOSE),2)
298 $(if $(filter $@, $(PHONY)),- due to target is PHONY, \
299 $(if $(wildcard $@), \
300 $(if $(strip $(any-prereq)),- due to: $(any-prereq), \
302 $(if $(cmd_$@),- due to command line change, \
303 $(if $(filter $@, $(targets)), \
304 - due to missing .cmd file, \
305 - due to $(notdir $@) not in $$(targets) \
310 - due to target missing \
314 echo-why = $(call escsq, $(strip $(why)))
317 ###############################################################################
319 # When a Kconfig string contains a filename, it is suitable for
320 # passing to shell commands. It is surrounded by double-quotes, and
321 # any double-quotes or backslashes within it are escaped by
324 # This is no use for dependencies or $(wildcard). We need to strip the
325 # surrounding quotes and the escaping from quotes and backslashes, and
326 # we *do* need to escape any spaces in the string. So, for example:
328 # Usage: $(eval $(call config_filename,FOO))
330 # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option,
331 # transformed as described above to be suitable for use within the
334 # Also, if the filename is a relative filename and exists in the source
335 # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to
336 # be prefixed to *both* command invocation and dependencies.
338 # Note: We also print the filenames in the quiet_cmd_foo text, and
339 # perhaps ought to have a version specially escaped for that purpose.
340 # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good
341 # enough. It'll strip the quotes in the common case where there's no
342 # space and it's a simple filename, and it'll retain the quotes when
343 # there's a space. There are some esoteric cases in which it'll print
344 # the wrong thing, but we don't really care. The actual dependencies
345 # and commands *do* get it right, with various combinations of single
346 # and double quotes, backslashes and spaces in the filenames.
348 ###############################################################################
350 space_escape := %%%SPACE%%%
352 define config_filename
353 ifneq ($$(CONFIG_$(1)),"")
354 $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1)))))))
355 ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME)))
357 ifeq ($$(wildcard $$($(1)_FILENAME)),)
358 ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),)
359 $(1)_SRCPREFIX := $(srctree)/
366 ###############################################################################
368 # It's a common trick to declare makefile variable that contains space
369 # we'll need it to convert the path string to list (string delimited by spaces)
373 # TEGRA_ROOT_PATH is the relative path to the directory one level upper than $srctree
374 _TEGRA_ROOT_PATH = $(subst ^$(realpath $(srctree)/..)/,,^$(realpath $(kbuild-dir)))
375 # _TEGRA_REL_PATH is path like "../../../" that points to directory one level
376 # upper that $(srctree)
377 _TEGRA_REL_PATH = $(subst $(the-space),/,$(patsubst %,..,$(subst /, ,$(_TEGRA_ROOT_PATH))))
378 # _KERNEL_LAST is the last directory name in $(srctree)
379 _KERNEL_LAST = $(lastword $(subst /, ,$(realpath $(srctree))))
380 # obj-y += $(call tegra-path,nv-hidden-repo,drivers/foo/bar.o)
381 # will evaluate to either:
382 # obj-y += ../../../nv-hidden-repo/drivers/foo/bar.o
385 tegra-base-kernel-path = $(call _TEGRA_REL_PATH)/$(call _KERNEL_LAST)
386 tegra-path = $(if $(wildcard $(srctree)/../$(1)),$(call _TEGRA_REL_PATH)/$(1)/$(2),$(call tegra-base-kernel-path)/$(2))
388 ifneq ($(NV_BUILD_KERNEL_DTS_ROOT),)
389 tegra-dtstree = $(NV_BUILD_KERNEL_DTS_ROOT)
391 tegra-dtstree = $(srctree)/../../hardware/nvidia
394 tegra-root-dtstree = $(subst ^$(realpath $(tegra-dtstree)/../..)/,,^$(realpath $(srctree)/arch/arm64/boot/dts))
395 tegra-rel-dtstree = $(subst $(the-space),/,$(patsubst %,..,$(subst /, ,$(tegra-root-dtstree))))