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1 | #### | |
2 | # kbuild: Generic definitions | |
3 | ||
4 | # Convenient variables | |
5 | comma := , | |
6 | quote := " | |
7 | squote := ' | |
8 | empty := | |
9 | space := $(empty) $(empty) | |
10 | ||
11 | ### | |
12 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
13 | dot-target = $(dir $@).$(notdir $@) | |
14 | ||
15 | ### | |
16 | # The temporary file to save gcc -MD generated dependencies must not | |
17 | # contain a comma | |
18 | depfile = $(subst $(comma),_,$(dot-target).d) | |
19 | ||
20 | ### | |
21 | # filename of target with directory and extension stripped | |
22 | basetarget = $(basename $(notdir $@)) | |
23 | ||
24 | ### | |
25 | # filename of first prerequisite with directory and extension stripped | |
26 | baseprereq = $(basename $(notdir $<)) | |
27 | ||
28 | ### | |
29 | # Escape single quote for use in echo statements | |
30 | escsq = $(subst $(squote),'\$(squote)',$1) | |
31 | ||
32 | ### | |
33 | # Easy method for doing a status message | |
34 | kecho := : | |
35 | quiet_kecho := echo | |
36 | silent_kecho := : | |
37 | kecho := $($(quiet)kecho) | |
38 | ||
39 | ### | |
40 | # filechk is used to check if the content of a generated file is updated. | |
41 | # Sample usage: | |
42 | # define filechk_sample | |
43 | # echo $KERNELRELEASE | |
44 | # endef | |
45 | # version.h : Makefile | |
46 | # $(call filechk,sample) | |
47 | # The rule defined shall write to stdout the content of the new file. | |
48 | # The existing file will be compared with the new one. | |
49 | # - If no file exist it is created | |
50 | # - If the content differ the new file is used | |
51 | # - If they are equal no change, and no timestamp update | |
52 | # - stdin is piped in from the first prerequisite ($<) so one has | |
53 | # to specify a valid file as first prerequisite (often the kbuild file) | |
54 | define filechk | |
55 | $(Q)set -e; \ | |
56 | $(kecho) ' CHK $@'; \ | |
57 | mkdir -p $(dir $@); \ | |
58 | $(filechk_$(1)) < $< > $@.tmp; \ | |
59 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ | |
60 | rm -f $@.tmp; \ | |
61 | else \ | |
62 | $(kecho) ' UPD $@'; \ | |
63 | mv -f $@.tmp $@; \ | |
64 | fi | |
65 | endef | |
66 | ||
67 | ###### | |
68 | # gcc support functions | |
69 | # See documentation in Documentation/kbuild/makefiles.txt | |
70 | ||
71 | # cc-cross-prefix | |
72 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
73 | # Return first prefix where a prefix$(CC) is found in PATH. | |
74 | # If no $(CC) found in PATH with listed prefixes return nothing | |
75 | cc-cross-prefix = \ | |
76 | $(word 1, $(foreach c,$(1), \ | |
77 | $(shell set -e; \ | |
78 | if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ | |
79 | echo $(c); \ | |
80 | fi))) | |
81 | ||
82 | # output directory for tests below | |
83 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) | |
84 | ||
85 | # try-run | |
86 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
87 | # Exit code chooses option. "$$TMP" is can be used as temporary file and | |
88 | # is automatically cleaned up. | |
89 | try-run = $(shell set -e; \ | |
90 | TMP="$(TMPOUT).$$$$.tmp"; \ | |
91 | TMPO="$(TMPOUT).$$$$.o"; \ | |
92 | if ($(1)) >/dev/null 2>&1; \ | |
93 | then echo "$(2)"; \ | |
94 | else echo "$(3)"; \ | |
95 | fi; \ | |
96 | rm -f "$$TMP" "$$TMPO") | |
97 | ||
98 | # as-option | |
99 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) | |
100 | ||
101 | as-option = $(call try-run,\ | |
102 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) | |
103 | ||
104 | # as-instr | |
105 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) | |
106 | ||
107 | as-instr = $(call try-run,\ | |
108 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) | |
109 | ||
110 | # cc-option | |
111 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) | |
112 | ||
113 | cc-option = $(call try-run,\ | |
114 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) | |
115 | ||
116 | # cc-option-yn | |
117 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) | |
118 | cc-option-yn = $(call try-run,\ | |
119 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) | |
120 | ||
121 | # cc-option-align | |
122 | # Prefix align with either -falign or -malign | |
123 | cc-option-align = $(subst -functions=0,,\ | |
124 | $(call cc-option,-falign-functions=0,-malign-functions=0)) | |
125 | ||
126 | # cc-disable-warning | |
127 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
128 | cc-disable-warning = $(call try-run,\ | |
129 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) | |
130 | ||
131 | # cc-name | |
132 | # Expands to either gcc or clang | |
133 | cc-name = $(shell $(CC) -v 2>&1 | grep -q "clang version" && echo clang || echo gcc) | |
134 | ||
135 | # cc-version | |
136 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) | |
137 | ||
138 | # cc-fullversion | |
139 | cc-fullversion = $(shell $(CONFIG_SHELL) \ | |
140 | $(srctree)/scripts/gcc-version.sh -p $(CC)) | |
141 | ||
142 | # cc-ifversion | |
143 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
144 | cc-ifversion = $(shell [ $(cc-version) $(1) $(2) ] && echo $(3) || echo $(4)) | |
145 | ||
146 | # cc-ldoption | |
147 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) | |
148 | cc-ldoption = $(call try-run,\ | |
149 | $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) | |
150 | ||
151 | # ld-option | |
152 | # Usage: LDFLAGS += $(call ld-option, -X) | |
153 | ld-option = $(call try-run,\ | |
154 | $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) | |
155 | ||
156 | # ar-option | |
157 | # Usage: KBUILD_ARFLAGS := $(call ar-option,D) | |
158 | # Important: no spaces around options | |
159 | ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) | |
160 | ||
161 | # ld-version | |
162 | # Note this is mainly for HJ Lu's 3 number binutil versions | |
163 | ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) | |
164 | ||
165 | # ld-ifversion | |
166 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
167 | ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) | |
168 | ||
169 | ###### | |
170 | ||
171 | ### | |
172 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | |
173 | # Usage: | |
174 | # $(Q)$(MAKE) $(build)=dir | |
175 | build := -f $(srctree)/scripts/Makefile.build obj | |
176 | ||
177 | ### | |
178 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= | |
179 | # Usage: | |
180 | # $(Q)$(MAKE) $(modbuiltin)=dir | |
181 | modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj | |
182 | ||
183 | ### | |
184 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= | |
185 | # Usage: | |
186 | # $(Q)$(MAKE) $(dtbinst)=dir | |
187 | dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj | |
188 | ||
189 | ### | |
190 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= | |
191 | # Usage: | |
192 | # $(Q)$(MAKE) $(clean)=dir | |
193 | clean := -f $(srctree)/scripts/Makefile.clean obj | |
194 | ||
195 | ### | |
196 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.headersinst obj= | |
197 | # Usage: | |
198 | # $(Q)$(MAKE) $(hdr-inst)=dir | |
199 | hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj | |
200 | ||
201 | # Prefix -I with $(srctree) if it is not an absolute path. | |
202 | # skip if -I has no parameter | |
203 | addtree = $(if $(patsubst -I%,%,$(1)), \ | |
204 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) | |
205 | ||
206 | # Find all -I options and call addtree | |
207 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) | |
208 | ||
209 | # echo command. | |
210 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
211 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ | |
212 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) | |
213 | ||
214 | # printing commands | |
215 | cmd = @$(echo-cmd) $(cmd_$(1)) | |
216 | ||
217 | # Add $(obj)/ for paths that are not absolute | |
218 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) | |
219 | ||
220 | ### | |
221 | # if_changed - execute command if any prerequisite is newer than | |
222 | # target, or command line has changed | |
223 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
224 | # including used config symbols | |
225 | # if_changed_rule - as if_changed but execute rule instead | |
226 | # See Documentation/kbuild/makefiles.txt for more info | |
227 | ||
228 | ifneq ($(KBUILD_NOCMDDEP),1) | |
229 | # Check if both arguments has same arguments. Result is empty string if equal. | |
230 | # User may override this check using make KBUILD_NOCMDDEP=1 | |
231 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ | |
232 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
233 | else | |
234 | arg-check = $(if $(strip $(cmd_$@)),,1) | |
235 | endif | |
236 | ||
237 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file | |
238 | # (needed for make) | |
239 | # Replace >#< with >\#< to avoid starting a comment in the .cmd file | |
240 | # (needed for make) | |
241 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
242 | # (needed for the shell) | |
243 | make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1))))) | |
244 | ||
245 | # Find any prerequisites that is newer than target or that does not exist. | |
246 | # PHONY targets skipped in both cases. | |
247 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
248 | ||
249 | # Execute command if command has changed or prerequisite(s) are updated. | |
250 | # | |
251 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ | |
252 | @set -e; \ | |
253 | $(echo-cmd) $(cmd_$(1)); \ | |
254 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
255 | ||
256 | # Execute the command and also postprocess generated .d dependencies file. | |
257 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ | |
258 | @set -e; \ | |
259 | $(echo-cmd) $(cmd_$(1)); \ | |
260 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
261 | rm -f $(depfile); \ | |
262 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
263 | ||
264 | # Usage: $(call if_changed_rule,foo) | |
265 | # Will check if $(cmd_foo) or any of the prerequisites changed, | |
266 | # and if so will execute $(rule_foo). | |
267 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ | |
268 | @set -e; \ | |
269 | $(rule_$(1))) | |
270 | ||
271 | ### | |
272 | # why - tell why a a target got build | |
273 | # enabled by make V=2 | |
274 | # Output (listed in the order they are checked): | |
275 | # (1) - due to target is PHONY | |
276 | # (2) - due to target missing | |
277 | # (3) - due to: file1.h file2.h | |
278 | # (4) - due to command line change | |
279 | # (5) - due to missing .cmd file | |
280 | # (6) - due to target not in $(targets) | |
281 | # (1) PHONY targets are always build | |
282 | # (2) No target, so we better build it | |
283 | # (3) Prerequisite is newer than target | |
284 | # (4) The command line stored in the file named dir/.target.cmd | |
285 | # differed from actual command line. This happens when compiler | |
286 | # options changes | |
287 | # (5) No dir/.target.cmd file (used to store command line) | |
288 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
289 | # This is a good hint that there is a bug in the kbuild file | |
290 | ifeq ($(KBUILD_VERBOSE),2) | |
291 | why = \ | |
292 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
293 | $(if $(wildcard $@), \ | |
294 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
295 | $(if $(arg-check), \ | |
296 | $(if $(cmd_$@),- due to command line change, \ | |
297 | $(if $(filter $@, $(targets)), \ | |
298 | - due to missing .cmd file, \ | |
299 | - due to $(notdir $@) not in $$(targets) \ | |
300 | ) \ | |
301 | ) \ | |
302 | ) \ | |
303 | ), \ | |
304 | - due to target missing \ | |
305 | ) \ | |
306 | ) | |
307 | ||
308 | echo-why = $(call escsq, $(strip $(why))) | |
309 | endif | |
310 | ||
311 | ############################################################################### | |
312 | # | |
313 | # When a Kconfig string contains a filename, it is suitable for | |
314 | # passing to shell commands. It is surrounded by double-quotes, and | |
315 | # any double-quotes or backslashes within it are escaped by | |
316 | # backslashes. | |
317 | # | |
318 | # This is no use for dependencies or $(wildcard). We need to strip the | |
319 | # surrounding quotes and the escaping from quotes and backslashes, and | |
320 | # we *do* need to escape any spaces in the string. So, for example: | |
321 | # | |
322 | # Usage: $(eval $(call config_filename,FOO)) | |
323 | # | |
324 | # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, | |
325 | # transformed as described above to be suitable for use within the | |
326 | # makefile. | |
327 | # | |
328 | # Also, if the filename is a relative filename and exists in the source | |
329 | # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to | |
330 | # be prefixed to *both* command invocation and dependencies. | |
331 | # | |
332 | # Note: We also print the filenames in the quiet_cmd_foo text, and | |
333 | # perhaps ought to have a version specially escaped for that purpose. | |
334 | # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good | |
335 | # enough. It'll strip the quotes in the common case where there's no | |
336 | # space and it's a simple filename, and it'll retain the quotes when | |
337 | # there's a space. There are some esoteric cases in which it'll print | |
338 | # the wrong thing, but we don't really care. The actual dependencies | |
339 | # and commands *do* get it right, with various combinations of single | |
340 | # and double quotes, backslashes and spaces in the filenames. | |
341 | # | |
342 | ############################################################################### | |
343 | # | |
344 | space_escape := %%%SPACE%%% | |
345 | # | |
346 | define config_filename | |
347 | ifneq ($$(CONFIG_$(1)),"") | |
348 | $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) | |
349 | ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) | |
350 | else | |
351 | ifeq ($$(wildcard $$($(1)_FILENAME)),) | |
352 | ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) | |
353 | $(1)_SRCPREFIX := $(srctree)/ | |
354 | endif | |
355 | endif | |
356 | endif | |
357 | endif | |
358 | endef | |
359 | # | |
360 | ############################################################################### |