1####
2# kbuild: Generic definitions
3
4# Convenient variables
5comma   := ,
6quote   := "
7squote  := '
8empty   :=
9space   := $(empty) $(empty)
10space_escape := _-_SPACE_-_
11pound := \#
12
13###
14# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
15dot-target = $(dir $@).$(notdir $@)
16
17###
18# The temporary file to save gcc -MD generated dependencies must not
19# contain a comma
20depfile = $(subst $(comma),_,$(dot-target).d)
21
22###
23# filename of target with directory and extension stripped
24basetarget = $(basename $(notdir $@))
25
26###
27# filename of first prerequisite with directory and extension stripped
28baseprereq = $(basename $(notdir $<))
29
30###
31# real prerequisites without phony targets
32real-prereqs = $(filter-out $(PHONY), $^)
33
34###
35# Escape single quote for use in echo statements
36escsq = $(subst $(squote),'\$(squote)',$1)
37
38###
39# real prerequisites without phony targets
40real-prereqs = $(filter-out $(PHONY), $^)
41
42###
43# Easy method for doing a status message
44       kecho := :
45 quiet_kecho := echo
46silent_kecho := :
47kecho := $($(quiet)kecho)
48
49###
50# filechk is used to check if the content of a generated file is updated.
51# Sample usage:
52# filechk_sample = echo $(KERNELRELEASE)
53# version.h: FORCE
54#	$(call filechk,sample)
55#
56# The rule defined shall write to stdout the content of the new file.
57# The existing file will be compared with the new one.
58# - If no file exist it is created
59# - If the content differ the new file is used
60# - If they are equal no change, and no timestamp update
61# - stdin is piped in from the first prerequisite ($<) so one has
62#   to specify a valid file as first prerequisite (often the kbuild file)
63define filechk
64	$(Q)set -e;				\
65	mkdir -p $(dir $@);			\
66	$(filechk_$(1)) < $< > $@.tmp;		\
67	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
68		rm -f $@.tmp;			\
69	else					\
70		$(kecho) '  UPD     $@';	\
71		mv -f $@.tmp $@;		\
72	fi
73endef
74
75######
76# gcc support functions
77# See documentation in Documentation/kbuild/makefiles.txt
78
79# cc-cross-prefix
80# Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-)
81# Return first prefix where a prefix$(CC) is found in PATH.
82# If no $(CC) found in PATH with listed prefixes return nothing
83cc-cross-prefix =  \
84	$(word 1, $(foreach c,$(1),                                   \
85		$(shell set -e;                                       \
86		if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \
87			echo $(c);                                    \
88		fi)))
89
90# output directory for tests below
91TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/)
92
93# try-run
94# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
95# Exit code chooses option. "$$TMP" is can be used as temporary file and
96# is automatically cleaned up.
97# modifed for U-Boot: prevent cc-option from leaving .*.su files
98try-run = $(shell set -e;		\
99	TMP="$(TMPOUT).$$$$.tmp";	\
100	TMPO="$(TMPOUT).$$$$.o";	\
101	TMPSU="$(TMPOUT).$$$$.su";	\
102	if ($(1)) >/dev/null 2>&1;	\
103	then echo "$(2)";		\
104	else echo "$(3)";		\
105	fi;				\
106	rm -f "$$TMP" "$$TMPO" "$$TMPSU")
107
108# as-option
109# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
110
111as-option = $(call try-run,\
112	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
113
114# as-instr
115# Usage: cflags-y += $(call as-instr,instr,option1,option2)
116
117as-instr = $(call try-run,\
118	printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
119
120# __cc-option
121# Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586)
122__cc-option = $(call try-run,\
123	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
124
125# cc-option
126# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
127cc-option = $(call __cc-option, $(CC),\
128	$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
129
130# hostcc-option
131# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
132hostcc-option = $(call __cc-option, $(HOSTCC),\
133	$(HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
134
135# cc-option-yn
136# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
137cc-option-yn = $(call try-run,\
138	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
139
140# cc-disable-warning
141# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
142cc-disable-warning = $(call try-run,\
143	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
144
145# cc-name
146# Expands to either gcc or clang
147cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
148
149# cc-version
150cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
151
152# cc-ifversion
153# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
154cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
155
156# added for U-Boot
157binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
158dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC))
159
160# cc-ldoption
161# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
162cc-ldoption = $(call try-run,\
163	$(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
164
165# ld-option
166# Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y)
167ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
168
169# ar-option
170# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
171# Important: no spaces around options
172ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
173
174# ld-version
175# Note this is mainly for HJ Lu's 3 number binutil versions
176ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
177
178# ld-ifversion
179# Usage:  $(call ld-ifversion, -ge, 22252, y)
180ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
181
182######
183
184###
185# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
186# Usage:
187# $(Q)$(MAKE) $(build)=dir
188build := -f $(srctree)/scripts/Makefile.build obj
189
190###
191# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
192# Usage:
193# $(Q)$(MAKE) $(modbuiltin)=dir
194modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
195
196###
197# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
198# Usage:
199# $(Q)$(MAKE) $(dtbinst)=dir
200dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj
201
202###
203# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
204# Usage:
205# $(Q)$(MAKE) $(clean)=dir
206clean := -f $(srctree)/scripts/Makefile.clean obj
207
208###
209# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
210# Usage:
211# $(Q)$(MAKE) $(hdr-inst)=dir
212hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
213
214# Prefix -I with $(srctree) if it is not an absolute path.
215# skip if -I has no parameter
216addtree = $(if $(patsubst -I%,%,$(1)), \
217$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1))
218
219# Find all -I options and call addtree
220flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
221
222# echo command.
223# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
224echo-cmd = $(if $($(quiet)cmd_$(1)),\
225	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
226
227# printing commands
228cmd = @set -e; $(echo-cmd) $(cmd_$(1))
229
230# Add $(obj)/ for paths that are not absolute
231objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
232
233###
234# if_changed      - execute command if any prerequisite is newer than
235#                   target, or command line has changed
236# if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
237#                   including used config symbols
238# if_changed_rule - as if_changed but execute rule instead
239# See doc/develop/makefiles.rst for more info
240
241ifneq ($(KBUILD_NOCMDDEP),1)
242# Check if both arguments are the same including their order. Result is empty
243# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
244arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
245                         $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
246else
247arg-check = $(if $(strip $(cmd_$@)),,1)
248endif
249
250# Replace >$< with >$$< to preserve $ when reloading the .cmd file
251# (needed for make)
252# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
253# (needed for make)
254# Replace >'< with >'\''< to be able to enclose the whole string in '...'
255# (needed for the shell)
256make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
257
258# Find any prerequisites that is newer than target or that does not exist.
259# PHONY targets skipped in both cases.
260any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
261
262# Execute command if command has changed or prerequisite(s) are updated.
263#
264if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
265	@set -e;                                                             \
266	$(echo-cmd) $(cmd_$(1));                                             \
267	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
268
269# Execute the command and also postprocess generated .d dependencies file.
270if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:)
271
272cmd_and_fixdep =						             \
273	$(cmd);							             \
274	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
275	rm -f $(depfile)
276
277# Usage: $(call if_changed_rule,foo)
278# Will check if $(cmd_foo) or any of the prerequisites changed,
279# and if so will execute $(rule_foo).
280if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:)
281
282###
283# why - tell why a a target got build
284#       enabled by make V=2
285#       Output (listed in the order they are checked):
286#          (1) - due to target is PHONY
287#          (2) - due to target missing
288#          (3) - due to: file1.h file2.h
289#          (4) - due to command line change
290#          (5) - due to missing .cmd file
291#          (6) - due to target not in $(targets)
292# (1) PHONY targets are always build
293# (2) No target, so we better build it
294# (3) Prerequisite is newer than target
295# (4) The command line stored in the file named dir/.target.cmd
296#     differed from actual command line. This happens when compiler
297#     options changes
298# (5) No dir/.target.cmd file (used to store command line)
299# (6) No dir/.target.cmd file and target not listed in $(targets)
300#     This is a good hint that there is a bug in the kbuild file
301ifeq ($(KBUILD_VERBOSE),2)
302why =                                                                        \
303    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
304        $(if $(wildcard $@),                                                 \
305            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
306                $(if $(arg-check),                                           \
307                    $(if $(cmd_$@),- due to command line change,             \
308                        $(if $(filter $@, $(targets)),                       \
309                            - due to missing .cmd file,                      \
310                            - due to $(notdir $@) not in $$(targets)         \
311                         )                                                   \
312                     )                                                       \
313                 )                                                           \
314             ),                                                              \
315             - due to target missing                                         \
316         )                                                                   \
317     )
318
319echo-why = $(call escsq, $(strip $(why)))
320endif
321
322# delete partially updated (i.e. corrupted) files on error
323.DELETE_ON_ERROR:
324
325# do not delete intermediate files automatically
326.SECONDARY:
327
328ifeq ($(CONFIG_SPL_BUILD),y)
329PHASE_ := SPL_
330else
331ifeq ($(CONFIG_VPL_BUILD),y)
332PHASE_ := VPL_
333else
334ifeq ($(CONFIG_TPL_BUILD),y)
335PHASE_ := TPL_
336else
337PHASE_ :=
338endif
339endif
340endif
341