1####
2# kbuild: Generic definitions
3
4# Convenient variables
5comma   := ,
6quote   := "
7squote  := '
8empty   :=
9space   := $(empty) $(empty)
10pound := \#
11
12###
13# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
14dot-target = $(dir $@).$(notdir $@)
15
16###
17# The temporary file to save gcc -MD generated dependencies must not
18# contain a comma
19depfile = $(subst $(comma),_,$(dot-target).d)
20
21###
22# filename of target with directory and extension stripped
23basetarget = $(basename $(notdir $@))
24
25###
26# filename of first prerequisite with directory and extension stripped
27baseprereq = $(basename $(notdir $<))
28
29###
30# Escape single quote for use in echo statements
31escsq = $(subst $(squote),'\$(squote)',$1)
32
33###
34# Easy method for doing a status message
35       kecho := :
36 quiet_kecho := echo
37silent_kecho := :
38kecho := $($(quiet)kecho)
39
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;				\
57	$(kecho) '  CHK     $@';		\
58	mkdir -p $(dir $@);			\
59	$(filechk_$(1)) < $< > $@.tmp;		\
60	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
61		rm -f $@.tmp;			\
62	else					\
63		$(kecho) '  UPD     $@';	\
64		mv -f $@.tmp $@;		\
65	fi
66endef
67
68######
69# gcc support functions
70# See documentation in Documentation/kbuild/makefiles.txt
71
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
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.
90# modifed for U-Boot: prevent cc-option from leaving .*.su files
91try-run = $(shell set -e;		\
92	TMP="$(TMPOUT).$$$$.tmp";	\
93	TMPO="$(TMPOUT).$$$$.o";	\
94	TMPSU="$(TMPOUT).$$$$.su";	\
95	if ($(1)) >/dev/null 2>&1;	\
96	then echo "$(2)";		\
97	else echo "$(3)";		\
98	fi;				\
99	rm -f "$$TMP" "$$TMPO" "$$TMPSU")
100
101# as-option
102# Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,)
103
104as-option = $(call try-run,\
105	$(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2))
106
107# as-instr
108# Usage: cflags-y += $(call as-instr,instr,option1,option2)
109
110as-instr = $(call try-run,\
111	printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3))
112
113# cc-option
114# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
115
116cc-option = $(call try-run,\
117	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
118
119# cc-option-yn
120# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
121cc-option-yn = $(call try-run,\
122	$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
123
124# cc-option-align
125# Prefix align with either -falign or -malign
126cc-option-align = $(subst -functions=0,,\
127	$(call cc-option,-falign-functions=0,-malign-functions=0))
128
129# cc-disable-warning
130# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
131cc-disable-warning = $(call try-run,\
132	$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
133
134# cc-name
135# Expands to either gcc or clang
136cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc)
137
138# cc-version
139cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
140
141# cc-fullversion
142cc-fullversion = $(shell $(CONFIG_SHELL) \
143	$(srctree)/scripts/gcc-version.sh -p $(CC))
144
145# cc-ifversion
146# Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
147cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4))
148
149# added for U-Boot
150binutils-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/binutils-version.sh $(AS))
151dtc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/dtc-version.sh $(DTC))
152
153# cc-ldoption
154# Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both)
155cc-ldoption = $(call try-run,\
156	$(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2))
157
158# ld-option
159# Usage: LDFLAGS += $(call ld-option, -X)
160ld-option = $(call try-run,\
161	$(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2))
162
163# ar-option
164# Usage: KBUILD_ARFLAGS := $(call ar-option,D)
165# Important: no spaces around options
166ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2))
167
168# ld-version
169# Note this is mainly for HJ Lu's 3 number binutil versions
170ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh)
171
172# ld-ifversion
173# Usage:  $(call ld-ifversion, -ge, 22252, y)
174ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4))
175
176######
177
178###
179# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
180# Usage:
181# $(Q)$(MAKE) $(build)=dir
182build := -f $(srctree)/scripts/Makefile.build obj
183
184###
185# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
186# Usage:
187# $(Q)$(MAKE) $(modbuiltin)=dir
188modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
189
190###
191# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
192# Usage:
193# $(Q)$(MAKE) $(dtbinst)=dir
194dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
195
196###
197# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=
198# Usage:
199# $(Q)$(MAKE) $(clean)=dir
200clean := -f $(srctree)/scripts/Makefile.clean obj
201
202###
203# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj=
204# Usage:
205# $(Q)$(MAKE) $(hdr-inst)=dir
206hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
207
208# Prefix -I with $(srctree) if it is not an absolute path.
209# skip if -I has no parameter
210addtree = $(if $(patsubst -I%,%,$(1)), \
211$(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
212
213# Find all -I options and call addtree
214flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
215
216# echo command.
217# Short version is used, if $(quiet) equals `quiet_', otherwise full one.
218echo-cmd = $(if $($(quiet)cmd_$(1)),\
219	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
220
221# printing commands
222cmd = @$(echo-cmd) $(cmd_$(1))
223
224# Add $(obj)/ for paths that are not absolute
225objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
226
227###
228# if_changed      - execute command if any prerequisite is newer than
229#                   target, or command line has changed
230# if_changed_dep  - as if_changed, but uses fixdep to reveal dependencies
231#                   including used config symbols
232# if_changed_rule - as if_changed but execute rule instead
233# See Documentation/kbuild/makefiles.txt for more info
234
235ifneq ($(KBUILD_NOCMDDEP),1)
236# Check if both arguments has same arguments. Result is empty string if equal.
237# User may override this check using make KBUILD_NOCMDDEP=1
238arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
239                    $(filter-out $(cmd_$@),   $(cmd_$(1))) )
240else
241arg-check = $(if $(strip $(cmd_$@)),,1)
242endif
243
244# Replace >$< with >$$< to preserve $ when reloading the .cmd file
245# (needed for make)
246# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
247# (needed for make)
248# Replace >'< with >'\''< to be able to enclose the whole string in '...'
249# (needed for the shell)
250make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
251
252# Find any prerequisites that is newer than target or that does not exist.
253# PHONY targets skipped in both cases.
254any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^)
255
256# Execute command if command has changed or prerequisite(s) are updated.
257#
258if_changed = $(if $(strip $(any-prereq) $(arg-check)),                       \
259	@set -e;                                                             \
260	$(echo-cmd) $(cmd_$(1));                                             \
261	printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd)
262
263# Execute the command and also postprocess generated .d dependencies file.
264if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ),                  \
265	@set -e;                                                             \
266	$(echo-cmd) $(cmd_$(1));                                             \
267	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\
268	rm -f $(depfile);                                                    \
269	mv -f $(dot-target).tmp $(dot-target).cmd)
270
271# Usage: $(call if_changed_rule,foo)
272# Will check if $(cmd_foo) or any of the prerequisites changed,
273# and if so will execute $(rule_foo).
274if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ),                 \
275	@set -e;                                                             \
276	$(rule_$(1)))
277
278###
279# why - tell why a a target got build
280#       enabled by make V=2
281#       Output (listed in the order they are checked):
282#          (1) - due to target is PHONY
283#          (2) - due to target missing
284#          (3) - due to: file1.h file2.h
285#          (4) - due to command line change
286#          (5) - due to missing .cmd file
287#          (6) - due to target not in $(targets)
288# (1) PHONY targets are always build
289# (2) No target, so we better build it
290# (3) Prerequisite is newer than target
291# (4) The command line stored in the file named dir/.target.cmd
292#     differed from actual command line. This happens when compiler
293#     options changes
294# (5) No dir/.target.cmd file (used to store command line)
295# (6) No dir/.target.cmd file and target not listed in $(targets)
296#     This is a good hint that there is a bug in the kbuild file
297ifeq ($(KBUILD_VERBOSE),2)
298why =                                                                        \
299    $(if $(filter $@, $(PHONY)),- due to target is PHONY,                    \
300        $(if $(wildcard $@),                                                 \
301            $(if $(strip $(any-prereq)),- due to: $(any-prereq),             \
302                $(if $(arg-check),                                           \
303                    $(if $(cmd_$@),- due to command line change,             \
304                        $(if $(filter $@, $(targets)),                       \
305                            - due to missing .cmd file,                      \
306                            - due to $(notdir $@) not in $$(targets)         \
307                         )                                                   \
308                     )                                                       \
309                 )                                                           \
310             ),                                                              \
311             - due to target missing                                         \
312         )                                                                   \
313     )
314
315echo-why = $(call escsq, $(strip $(why)))
316endif
317
318ifdef CONFIG_SPL_BUILD
319SPL_ := SPL_
320ifeq ($(CONFIG_TPL_BUILD),y)
321SPL_TPL_ := TPL_
322else
323SPL_TPL_ := SPL_
324endif
325else
326SPL_ :=
327SPL_TPL_ :=
328endif
329