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