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Commit | Line | Data |
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8ec4b4ff SR |
1 | #### |
2 | # kbuild: Generic definitions | |
3 | ||
beda9f3a | 4 | # Convenient variables |
8ec4b4ff | 5 | comma := , |
13338935 | 6 | quote := " |
d51bfb78 | 7 | squote := ' |
8ec4b4ff SR |
8 | empty := |
9 | space := $(empty) $(empty) | |
9c8fa9bc | 10 | space_escape := _-_SPACE_-_ |
9564a8cf | 11 | pound := \# |
8ec4b4ff | 12 | |
48f1f058 SR |
13 | ### |
14 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
15 | dot-target = $(dir $@).$(notdir $@) | |
16 | ||
8ec4b4ff SR |
17 | ### |
18 | # The temporary file to save gcc -MD generated dependencies must not | |
19 | # contain a comma | |
48f1f058 | 20 | depfile = $(subst $(comma),_,$(dot-target).d) |
8ec4b4ff | 21 | |
5e8d780d SR |
22 | ### |
23 | # filename of target with directory and extension stripped | |
24 | basetarget = $(basename $(notdir $@)) | |
25 | ||
afa974b7 MY |
26 | ### |
27 | # real prerequisites without phony targets | |
28 | real-prereqs = $(filter-out $(PHONY), $^) | |
29 | ||
d51bfb78 SR |
30 | ### |
31 | # Escape single quote for use in echo statements | |
32 | escsq = $(subst $(squote),'\$(squote)',$1) | |
33 | ||
5410ecc0 MF |
34 | ### |
35 | # Easy method for doing a status message | |
36 | kecho := : | |
37 | quiet_kecho := echo | |
38 | silent_kecho := : | |
39 | kecho := $($(quiet)kecho) | |
40 | ||
8ec4b4ff SR |
41 | ### |
42 | # filechk is used to check if the content of a generated file is updated. | |
43 | # Sample usage: | |
ba97df45 MY |
44 | # |
45 | # filechk_sample = echo $(KERNELRELEASE) | |
46 | # version.h: FORCE | |
8ec4b4ff | 47 | # $(call filechk,sample) |
ba97df45 | 48 | # |
8ec4b4ff SR |
49 | # The rule defined shall write to stdout the content of the new file. |
50 | # The existing file will be compared with the new one. | |
51 | # - If no file exist it is created | |
52 | # - If the content differ the new file is used | |
53 | # - If they are equal no change, and no timestamp update | |
54 | # - stdin is piped in from the first prerequisite ($<) so one has | |
55 | # to specify a valid file as first prerequisite (often the kbuild file) | |
56 | define filechk | |
57 | $(Q)set -e; \ | |
8ec4b4ff | 58 | mkdir -p $(dir $@); \ |
ad774086 | 59 | { $(filechk_$(1)); } > $@.tmp; \ |
8ec4b4ff SR |
60 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
61 | rm -f $@.tmp; \ | |
62 | else \ | |
fd54f502 | 63 | $(kecho) ' UPD $@'; \ |
8ec4b4ff SR |
64 | mv -f $@.tmp $@; \ |
65 | fi | |
66 | endef | |
67 | ||
20a468b5 | 68 | ###### |
9d6e7a70 | 69 | # gcc support functions |
20a468b5 SR |
70 | # See documentation in Documentation/kbuild/makefiles.txt |
71 | ||
910b4046 SR |
72 | # cc-cross-prefix |
73 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
bd55f96f MY |
74 | # Return first <prefix> where a <prefix>gcc is found in PATH. |
75 | # If no gcc found in PATH with listed prefixes return nothing | |
76 | cc-cross-prefix = $(firstword $(foreach c, $(filter-out -%, $(1)), \ | |
77 | $(if $(shell which $(c)gcc), $(c)))) | |
910b4046 | 78 | |
beda9f3a RZ |
79 | # output directory for tests below |
80 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) | |
81 | ||
82 | # try-run | |
83 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
312a3d09 C |
84 | # Exit code chooses option. "$$TMP" serves as a temporary file and is |
85 | # automatically cleaned up. | |
e08d6de4 | 86 | try-run = $(shell set -e; \ |
beda9f3a | 87 | TMP="$(TMPOUT).$$$$.tmp"; \ |
691ef3e7 | 88 | TMPO="$(TMPOUT).$$$$.o"; \ |
beda9f3a RZ |
89 | if ($(1)) >/dev/null 2>&1; \ |
90 | then echo "$(2)"; \ | |
91 | else echo "$(3)"; \ | |
92 | fi; \ | |
e08d6de4 | 93 | rm -f "$$TMP" "$$TMPO") |
347a00fb | 94 | |
20a468b5 | 95 | # as-option |
bff288c1 | 96 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a | 97 | |
e08d6de4 | 98 | as-option = $(call try-run,\ |
b1e0d8b7 | 99 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 | 100 | |
e2414910 | 101 | # as-instr |
bff288c1 | 102 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a | 103 | |
e08d6de4 | 104 | as-instr = $(call try-run,\ |
b1e0d8b7 | 105 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
e2414910 | 106 | |
9f3f1fd2 MK |
107 | # __cc-option |
108 | # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) | |
e08d6de4 | 109 | __cc-option = $(call try-run,\ |
9f3f1fd2 MK |
110 | $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) |
111 | ||
d26e9414 ER |
112 | # Do not attempt to build with gcc plugins during cc-option tests. |
113 | # (And this uses delayed resolution so the flags will be up to date.) | |
6ac38934 | 114 | CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) |
d26e9414 | 115 | |
20a468b5 | 116 | # cc-option |
bff288c1 | 117 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a | 118 | |
9f3f1fd2 MK |
119 | cc-option = $(call __cc-option, $(CC),\ |
120 | $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2)) | |
121 | ||
122 | # hostcc-option | |
123 | # Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586) | |
124 | hostcc-option = $(call __cc-option, $(HOSTCC),\ | |
96f14fe7 | 125 | $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2)) |
20a468b5 SR |
126 | |
127 | # cc-option-yn | |
bff288c1 | 128 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
e08d6de4 | 129 | cc-option-yn = $(call try-run,\ |
c3f0d0bc | 130 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
20a468b5 | 131 | |
8417da6f MM |
132 | # cc-disable-warning |
133 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
e08d6de4 | 134 | cc-disable-warning = $(call try-run,\ |
c3f0d0bc | 135 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
8417da6f | 136 | |
20a468b5 SR |
137 | # cc-ifversion |
138 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
d3a918c6 | 139 | cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) |
20a468b5 | 140 | |
f86fd306 SR |
141 | # cc-ldoption |
142 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) | |
e08d6de4 | 143 | cc-ldoption = $(call try-run,\ |
86a9df59 | 144 | $(CC) $(1) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) |
5de043f4 | 145 | |
691ef3e7 | 146 | # ld-option |
d503ac53 MY |
147 | # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) |
148 | ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) | |
691ef3e7 | 149 | |
40df759e MM |
150 | # ar-option |
151 | # Usage: KBUILD_ARFLAGS := $(call ar-option,D) | |
152 | # Important: no spaces around options | |
e08d6de4 | 153 | ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) |
40df759e | 154 | |
ccbef167 | 155 | # ld-version |
ccbef167 | 156 | # Note this is mainly for HJ Lu's 3 number binutil versions |
e08d6de4 | 157 | ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) |
ccbef167 AK |
158 | |
159 | # ld-ifversion | |
160 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
6dcb4e5e | 161 | ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) |
ccbef167 | 162 | |
5de043f4 | 163 | ###### |
0b0bf7a3 | 164 | |
beda9f3a | 165 | ### |
8ec4b4ff SR |
166 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
167 | # Usage: | |
168 | # $(Q)$(MAKE) $(build)=dir | |
5b2389b4 | 169 | build := -f $(srctree)/scripts/Makefile.build obj |
8ec4b4ff | 170 | |
bc081dd6 MM |
171 | ### |
172 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= | |
173 | # Usage: | |
174 | # $(Q)$(MAKE) $(modbuiltin)=dir | |
5b2389b4 | 175 | modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj |
bc081dd6 | 176 | |
9fb5e537 RR |
177 | ### |
178 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= | |
179 | # Usage: | |
180 | # $(Q)$(MAKE) $(dtbinst)=dir | |
487c7c77 | 181 | dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
9fb5e537 | 182 | |
371fdc77 MY |
183 | ### |
184 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= | |
185 | # Usage: | |
186 | # $(Q)$(MAKE) $(clean)=dir | |
187 | clean := -f $(srctree)/scripts/Makefile.clean obj | |
188 | ||
189 | ### | |
1846dfbd | 190 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj= |
371fdc77 MY |
191 | # Usage: |
192 | # $(Q)$(MAKE) $(hdr-inst)=dir | |
1846dfbd | 193 | hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj |
371fdc77 | 194 | |
beda9f3a | 195 | # Prefix -I with $(srctree) if it is not an absolute path. |
5b91c33c SR |
196 | # skip if -I has no parameter |
197 | addtree = $(if $(patsubst -I%,%,$(1)), \ | |
48f6e3cf | 198 | $(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)),$(1)) |
5de043f4 | 199 | |
d9df92e2 | 200 | # Find all -I options and call addtree |
beda9f3a | 201 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
d9df92e2 | 202 | |
5de043f4 OV |
203 | # echo command. |
204 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 205 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
206 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
207 | ||
208 | # printing commands | |
3a2429e1 | 209 | cmd = @set -e; $(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 210 | |
5de043f4 | 211 | # Add $(obj)/ for paths that are not absolute |
bff288c1 | 212 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
0a504f25 | 213 | |
8ec4b4ff | 214 | ### |
5de043f4 | 215 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
216 | # target, or command line has changed |
217 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
218 | # including used config symbols | |
219 | # if_changed_rule - as if_changed but execute rule instead | |
220 | # See Documentation/kbuild/makefiles.txt for more info | |
221 | ||
222 | ifneq ($(KBUILD_NOCMDDEP),1) | |
9c8fa9bc MY |
223 | # Check if both arguments are the same including their order. Result is empty |
224 | # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 | |
225 | arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ | |
226 | $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) | |
c4d5ee13 MM |
227 | else |
228 | arg-check = $(if $(strip $(cmd_$@)),,1) | |
8ec4b4ff SR |
229 | endif |
230 | ||
164f0d2e MM |
231 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file |
232 | # (needed for make) | |
9564a8cf | 233 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
164f0d2e MM |
234 | # (needed for make) |
235 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
236 | # (needed for the shell) | |
9564a8cf | 237 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
6176aa9a | 238 | |
48f1f058 SR |
239 | # Find any prerequisites that is newer than target or that does not exist. |
240 | # PHONY targets skipped in both cases. | |
241 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
242 | ||
5de043f4 | 243 | # Execute command if command has changed or prerequisite(s) are updated. |
48f1f058 | 244 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
67126965 | 245 | $(cmd); \ |
2aedcd09 | 246 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
8ec4b4ff | 247 | |
5de043f4 | 248 | # Execute the command and also postprocess generated .d dependencies file. |
3a2429e1 | 249 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check)),$(cmd_and_fixdep),@:) |
c1a95fda | 250 | |
e4aca459 | 251 | cmd_and_fixdep = \ |
3a2429e1 | 252 | $(cmd); \ |
392885ee | 253 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
e5d28910 | 254 | rm -f $(depfile) |
c1a95fda | 255 | |
8ec4b4ff | 256 | # Usage: $(call if_changed_rule,foo) |
beda9f3a RZ |
257 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
258 | # and if so will execute $(rule_foo). | |
3a2429e1 | 259 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check)),$(rule_$(1)),@:) |
48f1f058 | 260 | |
45d506bd | 261 | ### |
312a3d09 | 262 | # why - tell why a target got built |
45d506bd SR |
263 | # enabled by make V=2 |
264 | # Output (listed in the order they are checked): | |
265 | # (1) - due to target is PHONY | |
266 | # (2) - due to target missing | |
267 | # (3) - due to: file1.h file2.h | |
268 | # (4) - due to command line change | |
269 | # (5) - due to missing .cmd file | |
270 | # (6) - due to target not in $(targets) | |
271 | # (1) PHONY targets are always build | |
272 | # (2) No target, so we better build it | |
273 | # (3) Prerequisite is newer than target | |
274 | # (4) The command line stored in the file named dir/.target.cmd | |
275 | # differed from actual command line. This happens when compiler | |
276 | # options changes | |
277 | # (5) No dir/.target.cmd file (used to store command line) | |
278 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
279 | # This is a good hint that there is a bug in the kbuild file | |
280 | ifeq ($(KBUILD_VERBOSE),2) | |
281 | why = \ | |
282 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
283 | $(if $(wildcard $@), \ | |
284 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
285 | $(if $(arg-check), \ | |
286 | $(if $(cmd_$@),- due to command line change, \ | |
287 | $(if $(filter $@, $(targets)), \ | |
288 | - due to missing .cmd file, \ | |
289 | - due to $(notdir $@) not in $$(targets) \ | |
290 | ) \ | |
291 | ) \ | |
292 | ) \ | |
293 | ), \ | |
294 | - due to target missing \ | |
295 | ) \ | |
296 | ) | |
297 | ||
298 | echo-why = $(call escsq, $(strip $(why))) | |
299 | endif | |
3ee550f1 DW |
300 | |
301 | ############################################################################### | |
302 | # | |
303 | # When a Kconfig string contains a filename, it is suitable for | |
304 | # passing to shell commands. It is surrounded by double-quotes, and | |
305 | # any double-quotes or backslashes within it are escaped by | |
306 | # backslashes. | |
307 | # | |
308 | # This is no use for dependencies or $(wildcard). We need to strip the | |
309 | # surrounding quotes and the escaping from quotes and backslashes, and | |
310 | # we *do* need to escape any spaces in the string. So, for example: | |
311 | # | |
312 | # Usage: $(eval $(call config_filename,FOO)) | |
313 | # | |
314 | # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, | |
315 | # transformed as described above to be suitable for use within the | |
316 | # makefile. | |
317 | # | |
318 | # Also, if the filename is a relative filename and exists in the source | |
319 | # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to | |
320 | # be prefixed to *both* command invocation and dependencies. | |
321 | # | |
322 | # Note: We also print the filenames in the quiet_cmd_foo text, and | |
323 | # perhaps ought to have a version specially escaped for that purpose. | |
324 | # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good | |
325 | # enough. It'll strip the quotes in the common case where there's no | |
326 | # space and it's a simple filename, and it'll retain the quotes when | |
327 | # there's a space. There are some esoteric cases in which it'll print | |
328 | # the wrong thing, but we don't really care. The actual dependencies | |
329 | # and commands *do* get it right, with various combinations of single | |
330 | # and double quotes, backslashes and spaces in the filenames. | |
331 | # | |
332 | ############################################################################### | |
333 | # | |
3ee550f1 DW |
334 | define config_filename |
335 | ifneq ($$(CONFIG_$(1)),"") | |
336 | $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) | |
337 | ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) | |
338 | else | |
339 | ifeq ($$(wildcard $$($(1)_FILENAME)),) | |
340 | ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) | |
341 | $(1)_SRCPREFIX := $(srctree)/ | |
342 | endif | |
343 | endif | |
344 | endif | |
345 | endif | |
346 | endef | |
347 | # | |
348 | ############################################################################### | |
9c2af1c7 MY |
349 | |
350 | # delete partially updated (i.e. corrupted) files on error | |
351 | .DELETE_ON_ERROR: | |
8e9b61b2 MY |
352 | |
353 | # do not delete intermediate files automatically | |
354 | .SECONDARY: |