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1 | # SPDX-License-Identifier: GPL-2.0 | |
2 | #### | |
3 | # kbuild: Generic definitions | |
4 | ||
5 | # Convenient variables | |
6 | comma := , | |
7 | quote := " | |
8 | squote := ' | |
9 | empty := | |
10 | space := $(empty) $(empty) | |
11 | space_escape := _-_SPACE_-_ | |
12 | pound := \# | |
13 | ||
14 | ### | |
15 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
16 | dot-target = $(dir $@).$(notdir $@) | |
17 | ||
18 | ### | |
19 | # The temporary file to save gcc -MMD generated dependencies must not | |
20 | # contain a comma | |
21 | depfile = $(subst $(comma),_,$(dot-target).d) | |
22 | ||
23 | ### | |
24 | # filename of target with directory and extension stripped | |
25 | basetarget = $(basename $(notdir $@)) | |
26 | ||
27 | ### | |
28 | # real prerequisites without phony targets | |
29 | real-prereqs = $(filter-out $(PHONY), $^) | |
30 | ||
31 | ### | |
32 | # Escape single quote for use in echo statements | |
33 | escsq = $(subst $(squote),'\$(squote)',$1) | |
34 | ||
35 | ### | |
36 | # Quote a string to pass it to C files. foo => '"foo"' | |
37 | stringify = $(squote)$(quote)$1$(quote)$(squote) | |
38 | ||
39 | ### | |
40 | # Easy method for doing a status message | |
41 | kecho := : | |
42 | quiet_kecho := echo | |
43 | silent_kecho := : | |
44 | kecho := $($(quiet)kecho) | |
45 | ||
46 | ### | |
47 | # filechk is used to check if the content of a generated file is updated. | |
48 | # Sample usage: | |
49 | # | |
50 | # filechk_sample = echo $(KERNELRELEASE) | |
51 | # version.h: FORCE | |
52 | # $(call filechk,sample) | |
53 | # | |
54 | # The rule defined shall write to stdout the content of the new file. | |
55 | # The existing file will be compared with the new one. | |
56 | # - If no file exist it is created | |
57 | # - If the content differ the new file is used | |
58 | # - If they are equal no change, and no timestamp update | |
59 | define filechk | |
60 | $(Q)set -e; \ | |
61 | mkdir -p $(dir $@); \ | |
62 | trap "rm -f $(dot-target).tmp" EXIT; \ | |
63 | { $(filechk_$(1)); } > $(dot-target).tmp; \ | |
64 | if [ ! -r $@ ] || ! cmp -s $@ $(dot-target).tmp; then \ | |
65 | $(kecho) ' UPD $@'; \ | |
66 | mv -f $(dot-target).tmp $@; \ | |
67 | fi | |
68 | endef | |
69 | ||
70 | ###### | |
71 | # gcc support functions | |
72 | # See documentation in Documentation/kbuild/makefiles.rst | |
73 | ||
74 | # cc-cross-prefix | |
75 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
76 | # Return first <prefix> where a <prefix>gcc is found in PATH. | |
77 | # If no gcc found in PATH with listed prefixes return nothing | |
78 | # | |
79 | # Note: '2>/dev/null' is here to force Make to invoke a shell. Otherwise, it | |
80 | # would try to directly execute the shell builtin 'command'. This workaround | |
81 | # should be kept for a long time since this issue was fixed only after the | |
82 | # GNU Make 4.2.1 release. | |
83 | cc-cross-prefix = $(firstword $(foreach c, $(1), \ | |
84 | $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) | |
85 | ||
86 | # output directory for tests below | |
87 | TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ | |
88 | ||
89 | # try-run | |
90 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
91 | # Exit code chooses option. "$$TMP" serves as a temporary file and is | |
92 | # automatically cleaned up. | |
93 | try-run = $(shell set -e; \ | |
94 | TMP=$(TMPOUT)/tmp; \ | |
95 | TMPO=$(TMPOUT)/tmp.o; \ | |
96 | mkdir -p $(TMPOUT); \ | |
97 | trap "rm -rf $(TMPOUT)" EXIT; \ | |
98 | if ($(1)) >/dev/null 2>&1; \ | |
99 | then echo "$(2)"; \ | |
100 | else echo "$(3)"; \ | |
101 | fi) | |
102 | ||
103 | # as-option | |
104 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) | |
105 | ||
106 | as-option = $(call try-run,\ | |
107 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) | |
108 | ||
109 | # as-instr | |
110 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) | |
111 | ||
112 | as-instr = $(call try-run,\ | |
113 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) | |
114 | ||
115 | # __cc-option | |
116 | # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) | |
117 | __cc-option = $(call try-run,\ | |
118 | $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) | |
119 | ||
120 | # cc-option | |
121 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) | |
122 | ||
123 | cc-option = $(call __cc-option, $(CC),\ | |
124 | $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) | |
125 | ||
126 | # cc-option-yn | |
127 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) | |
128 | cc-option-yn = $(call try-run,\ | |
129 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) | |
130 | ||
131 | # cc-disable-warning | |
132 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
133 | cc-disable-warning = $(call try-run,\ | |
134 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) | |
135 | ||
136 | # cc-ifversion | |
137 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
138 | cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) | |
139 | ||
140 | # ld-option | |
141 | # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) | |
142 | ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) | |
143 | ||
144 | # ld-version | |
145 | # Note this is mainly for HJ Lu's 3 number binutil versions | |
146 | ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) | |
147 | ||
148 | # ld-ifversion | |
149 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
150 | ld-ifversion = $(shell [ $(ld-version) $(1) $(2) ] && echo $(3) || echo $(4)) | |
151 | ||
152 | ###### | |
153 | ||
154 | ### | |
155 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | |
156 | # Usage: | |
157 | # $(Q)$(MAKE) $(build)=dir | |
158 | build := -f $(srctree)/scripts/Makefile.build obj | |
159 | ||
160 | ### | |
161 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= | |
162 | # Usage: | |
163 | # $(Q)$(MAKE) $(dtbinst)=dir | |
164 | dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj | |
165 | ||
166 | ### | |
167 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= | |
168 | # Usage: | |
169 | # $(Q)$(MAKE) $(clean)=dir | |
170 | clean := -f $(srctree)/scripts/Makefile.clean obj | |
171 | ||
172 | # echo command. | |
173 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
174 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ | |
175 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) | |
176 | ||
177 | # printing commands | |
178 | cmd = @set -e; $(echo-cmd) $(cmd_$(1)) | |
179 | ||
180 | ### | |
181 | # if_changed - execute command if any prerequisite is newer than | |
182 | # target, or command line has changed | |
183 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
184 | # including used config symbols | |
185 | # if_changed_rule - as if_changed but execute rule instead | |
186 | # See Documentation/kbuild/makefiles.rst for more info | |
187 | ||
188 | ifneq ($(KBUILD_NOCMDDEP),1) | |
189 | # Check if both commands are the same including their order. Result is empty | |
190 | # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 | |
191 | cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ | |
192 | $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) | |
193 | else | |
194 | cmd-check = $(if $(strip $(cmd_$@)),,1) | |
195 | endif | |
196 | ||
197 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file | |
198 | # (needed for make) | |
199 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file | |
200 | # (needed for make) | |
201 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
202 | # (needed for the shell) | |
203 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) | |
204 | ||
205 | # Find any prerequisites that are newer than target or that do not exist. | |
206 | # (This is not true for now; $? should contain any non-existent prerequisites, | |
207 | # but it does not work as expected when .SECONDARY is present. This seems a bug | |
208 | # of GNU Make.) | |
209 | # PHONY targets skipped in both cases. | |
210 | newer-prereqs = $(filter-out $(PHONY),$?) | |
211 | ||
212 | # Execute command if command has changed or prerequisite(s) are updated. | |
213 | if_changed = $(if $(newer-prereqs)$(cmd-check), \ | |
214 | $(cmd); \ | |
215 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) | |
216 | ||
217 | # Execute the command and also postprocess generated .d dependencies file. | |
218 | if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:) | |
219 | ||
220 | cmd_and_fixdep = \ | |
221 | $(cmd); \ | |
222 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ | |
223 | rm -f $(depfile) | |
224 | ||
225 | # Usage: $(call if_changed_rule,foo) | |
226 | # Will check if $(cmd_foo) or any of the prerequisites changed, | |
227 | # and if so will execute $(rule_foo). | |
228 | if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:) | |
229 | ||
230 | ### | |
231 | # why - tell why a target got built | |
232 | # enabled by make V=2 | |
233 | # Output (listed in the order they are checked): | |
234 | # (1) - due to target is PHONY | |
235 | # (2) - due to target missing | |
236 | # (3) - due to: file1.h file2.h | |
237 | # (4) - due to command line change | |
238 | # (5) - due to missing .cmd file | |
239 | # (6) - due to target not in $(targets) | |
240 | # (1) PHONY targets are always build | |
241 | # (2) No target, so we better build it | |
242 | # (3) Prerequisite is newer than target | |
243 | # (4) The command line stored in the file named dir/.target.cmd | |
244 | # differed from actual command line. This happens when compiler | |
245 | # options changes | |
246 | # (5) No dir/.target.cmd file (used to store command line) | |
247 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
248 | # This is a good hint that there is a bug in the kbuild file | |
249 | ifeq ($(KBUILD_VERBOSE),2) | |
250 | why = \ | |
251 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
252 | $(if $(wildcard $@), \ | |
253 | $(if $(newer-prereqs),- due to: $(newer-prereqs), \ | |
254 | $(if $(cmd-check), \ | |
255 | $(if $(cmd_$@),- due to command line change, \ | |
256 | $(if $(filter $@, $(targets)), \ | |
257 | - due to missing .cmd file, \ | |
258 | - due to $(notdir $@) not in $$(targets) \ | |
259 | ) \ | |
260 | ) \ | |
261 | ) \ | |
262 | ), \ | |
263 | - due to target missing \ | |
264 | ) \ | |
265 | ) | |
266 | ||
267 | echo-why = $(call escsq, $(strip $(why))) | |
268 | endif | |
269 | ||
270 | ############################################################################### | |
271 | # | |
272 | # When a Kconfig string contains a filename, it is suitable for | |
273 | # passing to shell commands. It is surrounded by double-quotes, and | |
274 | # any double-quotes or backslashes within it are escaped by | |
275 | # backslashes. | |
276 | # | |
277 | # This is no use for dependencies or $(wildcard). We need to strip the | |
278 | # surrounding quotes and the escaping from quotes and backslashes, and | |
279 | # we *do* need to escape any spaces in the string. So, for example: | |
280 | # | |
281 | # Usage: $(eval $(call config_filename,FOO)) | |
282 | # | |
283 | # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, | |
284 | # transformed as described above to be suitable for use within the | |
285 | # makefile. | |
286 | # | |
287 | # Also, if the filename is a relative filename and exists in the source | |
288 | # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to | |
289 | # be prefixed to *both* command invocation and dependencies. | |
290 | # | |
291 | # Note: We also print the filenames in the quiet_cmd_foo text, and | |
292 | # perhaps ought to have a version specially escaped for that purpose. | |
293 | # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good | |
294 | # enough. It'll strip the quotes in the common case where there's no | |
295 | # space and it's a simple filename, and it'll retain the quotes when | |
296 | # there's a space. There are some esoteric cases in which it'll print | |
297 | # the wrong thing, but we don't really care. The actual dependencies | |
298 | # and commands *do* get it right, with various combinations of single | |
299 | # and double quotes, backslashes and spaces in the filenames. | |
300 | # | |
301 | ############################################################################### | |
302 | # | |
303 | define config_filename | |
304 | ifneq ($$(CONFIG_$(1)),"") | |
305 | $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) | |
306 | ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) | |
307 | else | |
308 | ifeq ($$(wildcard $$($(1)_FILENAME)),) | |
309 | ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) | |
310 | $(1)_SRCPREFIX := $(srctree)/ | |
311 | endif | |
312 | endif | |
313 | endif | |
314 | endif | |
315 | endef | |
316 | # | |
317 | ############################################################################### | |
318 | ||
319 | # delete partially updated (i.e. corrupted) files on error | |
320 | .DELETE_ON_ERROR: | |
321 | ||
322 | # do not delete intermediate files automatically | |
323 | .SECONDARY: |