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Commit | Line | Data |
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96ac6d43 | 1 | # SPDX-License-Identifier: GPL-2.0 |
8ec4b4ff SR |
2 | #### |
3 | # kbuild: Generic definitions | |
4 | ||
beda9f3a | 5 | # Convenient variables |
8ec4b4ff | 6 | comma := , |
13338935 | 7 | quote := " |
d51bfb78 | 8 | squote := ' |
8ec4b4ff SR |
9 | empty := |
10 | space := $(empty) $(empty) | |
9c8fa9bc | 11 | space_escape := _-_SPACE_-_ |
9564a8cf | 12 | pound := \# |
8ec4b4ff | 13 | |
48f1f058 SR |
14 | ### |
15 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
16 | dot-target = $(dir $@).$(notdir $@) | |
17 | ||
8ec4b4ff | 18 | ### |
30a77297 | 19 | # The temporary file to save gcc -MMD generated dependencies must not |
8ec4b4ff | 20 | # contain a comma |
48f1f058 | 21 | depfile = $(subst $(comma),_,$(dot-target).d) |
8ec4b4ff | 22 | |
5e8d780d SR |
23 | ### |
24 | # filename of target with directory and extension stripped | |
25 | basetarget = $(basename $(notdir $@)) | |
26 | ||
afa974b7 MY |
27 | ### |
28 | # real prerequisites without phony targets | |
29 | real-prereqs = $(filter-out $(PHONY), $^) | |
30 | ||
d51bfb78 SR |
31 | ### |
32 | # Escape single quote for use in echo statements | |
33 | escsq = $(subst $(squote),'\$(squote)',$1) | |
34 | ||
7e826c44 MY |
35 | ### |
36 | # Quote a string to pass it to C files. foo => '"foo"' | |
37 | stringify = $(squote)$(quote)$1$(quote)$(squote) | |
38 | ||
5410ecc0 MF |
39 | ### |
40 | # Easy method for doing a status message | |
41 | kecho := : | |
42 | quiet_kecho := echo | |
43 | silent_kecho := : | |
44 | kecho := $($(quiet)kecho) | |
45 | ||
8ec4b4ff SR |
46 | ### |
47 | # filechk is used to check if the content of a generated file is updated. | |
48 | # Sample usage: | |
ba97df45 MY |
49 | # |
50 | # filechk_sample = echo $(KERNELRELEASE) | |
51 | # version.h: FORCE | |
8ec4b4ff | 52 | # $(call filechk,sample) |
ba97df45 | 53 | # |
8ec4b4ff SR |
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 | |
8ec4b4ff | 59 | define filechk |
88fe89a4 MY |
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 $@; \ | |
8ec4b4ff SR |
67 | fi |
68 | endef | |
69 | ||
20a468b5 | 70 | ###### |
9d6e7a70 | 71 | # gcc support functions |
cd238eff | 72 | # See documentation in Documentation/kbuild/makefiles.rst |
20a468b5 | 73 | |
910b4046 SR |
74 | # cc-cross-prefix |
75 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
bd55f96f MY |
76 | # Return first <prefix> where a <prefix>gcc is found in PATH. |
77 | # If no gcc found in PATH with listed prefixes return nothing | |
913ab978 MY |
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. | |
d4a74bbf MY |
83 | cc-cross-prefix = $(firstword $(foreach c, $(1), \ |
84 | $(if $(shell command -v -- $(c)gcc 2>/dev/null), $(c)))) | |
910b4046 | 85 | |
beda9f3a | 86 | # output directory for tests below |
f2f02ebd | 87 | TMPOUT = $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_$$$$ |
beda9f3a RZ |
88 | |
89 | # try-run | |
90 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
312a3d09 C |
91 | # Exit code chooses option. "$$TMP" serves as a temporary file and is |
92 | # automatically cleaned up. | |
e08d6de4 | 93 | try-run = $(shell set -e; \ |
f2f02ebd MY |
94 | TMP=$(TMPOUT)/tmp; \ |
95 | TMPO=$(TMPOUT)/tmp.o; \ | |
96 | mkdir -p $(TMPOUT); \ | |
97 | trap "rm -rf $(TMPOUT)" EXIT; \ | |
beda9f3a RZ |
98 | if ($(1)) >/dev/null 2>&1; \ |
99 | then echo "$(2)"; \ | |
100 | else echo "$(3)"; \ | |
f2f02ebd | 101 | fi) |
347a00fb | 102 | |
20a468b5 | 103 | # as-option |
bff288c1 | 104 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a | 105 | |
e08d6de4 | 106 | as-option = $(call try-run,\ |
b1e0d8b7 | 107 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 | 108 | |
e2414910 | 109 | # as-instr |
bff288c1 | 110 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a | 111 | |
e08d6de4 | 112 | as-instr = $(call try-run,\ |
b1e0d8b7 | 113 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
e2414910 | 114 | |
9f3f1fd2 MK |
115 | # __cc-option |
116 | # Usage: MY_CFLAGS += $(call __cc-option,$(CC),$(MY_CFLAGS),-march=winchip-c6,-march=i586) | |
e08d6de4 | 117 | __cc-option = $(call try-run,\ |
9f3f1fd2 MK |
118 | $(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4)) |
119 | ||
20a468b5 | 120 | # cc-option |
bff288c1 | 121 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a | 122 | |
9f3f1fd2 | 123 | cc-option = $(call __cc-option, $(CC),\ |
132305b3 | 124 | $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2)) |
9f3f1fd2 | 125 | |
20a468b5 | 126 | # cc-option-yn |
bff288c1 | 127 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
e08d6de4 | 128 | cc-option-yn = $(call try-run,\ |
132305b3 | 129 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
20a468b5 | 130 | |
8417da6f MM |
131 | # cc-disable-warning |
132 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
e08d6de4 | 133 | cc-disable-warning = $(call try-run,\ |
132305b3 | 134 | $(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
8417da6f | 135 | |
20a468b5 SR |
136 | # cc-ifversion |
137 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
d3a918c6 | 138 | cc-ifversion = $(shell [ $(CONFIG_GCC_VERSION)0 $(1) $(2)000 ] && echo $(3) || echo $(4)) |
20a468b5 | 139 | |
691ef3e7 | 140 | # ld-option |
d503ac53 MY |
141 | # Usage: KBUILD_LDFLAGS += $(call ld-option, -X, -Y) |
142 | ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3)) | |
691ef3e7 | 143 | |
ccbef167 AK |
144 | # ld-ifversion |
145 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
05f6bbf2 | 146 | ld-ifversion = $(shell [ $(CONFIG_LD_VERSION)0 $(1) $(2)0 ] && echo $(3) || echo $(4)) |
ccbef167 | 147 | |
5de043f4 | 148 | ###### |
0b0bf7a3 | 149 | |
beda9f3a | 150 | ### |
8ec4b4ff SR |
151 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
152 | # Usage: | |
153 | # $(Q)$(MAKE) $(build)=dir | |
5b2389b4 | 154 | build := -f $(srctree)/scripts/Makefile.build obj |
8ec4b4ff | 155 | |
9fb5e537 RR |
156 | ### |
157 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj= | |
158 | # Usage: | |
159 | # $(Q)$(MAKE) $(dtbinst)=dir | |
487c7c77 | 160 | dtbinst := -f $(srctree)/scripts/Makefile.dtbinst obj |
9fb5e537 | 161 | |
371fdc77 MY |
162 | ### |
163 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj= | |
164 | # Usage: | |
165 | # $(Q)$(MAKE) $(clean)=dir | |
166 | clean := -f $(srctree)/scripts/Makefile.clean obj | |
167 | ||
5de043f4 OV |
168 | # echo command. |
169 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 170 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
171 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
172 | ||
173 | # printing commands | |
3a2429e1 | 174 | cmd = @set -e; $(echo-cmd) $(cmd_$(1)) |
8ec4b4ff SR |
175 | |
176 | ### | |
5de043f4 | 177 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
178 | # target, or command line has changed |
179 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
180 | # including used config symbols | |
181 | # if_changed_rule - as if_changed but execute rule instead | |
cd238eff | 182 | # See Documentation/kbuild/makefiles.rst for more info |
8ec4b4ff SR |
183 | |
184 | ifneq ($(KBUILD_NOCMDDEP),1) | |
50bcca6a | 185 | # Check if both commands are the same including their order. Result is empty |
9c8fa9bc | 186 | # string if equal. User may override this check using make KBUILD_NOCMDDEP=1 |
50bcca6a | 187 | cmd-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \ |
9c8fa9bc | 188 | $(subst $(space),$(space_escape),$(strip $(cmd_$1)))) |
c4d5ee13 | 189 | else |
50bcca6a | 190 | cmd-check = $(if $(strip $(cmd_$@)),,1) |
8ec4b4ff SR |
191 | endif |
192 | ||
164f0d2e MM |
193 | # Replace >$< with >$$< to preserve $ when reloading the .cmd file |
194 | # (needed for make) | |
9564a8cf | 195 | # Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file |
164f0d2e MM |
196 | # (needed for make) |
197 | # Replace >'< with >'\''< to be able to enclose the whole string in '...' | |
198 | # (needed for the shell) | |
9564a8cf | 199 | make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1))))) |
6176aa9a | 200 | |
2d3b1b8f MY |
201 | # Find any prerequisites that are newer than target or that do not exist. |
202 | # (This is not true for now; $? should contain any non-existent prerequisites, | |
203 | # but it does not work as expected when .SECONDARY is present. This seems a bug | |
204 | # of GNU Make.) | |
48f1f058 | 205 | # PHONY targets skipped in both cases. |
eba19032 | 206 | newer-prereqs = $(filter-out $(PHONY),$?) |
48f1f058 | 207 | |
5de043f4 | 208 | # Execute command if command has changed or prerequisite(s) are updated. |
eba19032 | 209 | if_changed = $(if $(newer-prereqs)$(cmd-check), \ |
67126965 | 210 | $(cmd); \ |
2aedcd09 | 211 | printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:) |
8ec4b4ff | 212 | |
5de043f4 | 213 | # Execute the command and also postprocess generated .d dependencies file. |
eba19032 | 214 | if_changed_dep = $(if $(newer-prereqs)$(cmd-check),$(cmd_and_fixdep),@:) |
c1a95fda | 215 | |
e4aca459 | 216 | cmd_and_fixdep = \ |
3a2429e1 | 217 | $(cmd); \ |
392885ee | 218 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\ |
e5d28910 | 219 | rm -f $(depfile) |
c1a95fda | 220 | |
8ec4b4ff | 221 | # Usage: $(call if_changed_rule,foo) |
beda9f3a RZ |
222 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
223 | # and if so will execute $(rule_foo). | |
eba19032 | 224 | if_changed_rule = $(if $(newer-prereqs)$(cmd-check),$(rule_$(1)),@:) |
48f1f058 | 225 | |
45d506bd | 226 | ### |
312a3d09 | 227 | # why - tell why a target got built |
45d506bd SR |
228 | # enabled by make V=2 |
229 | # Output (listed in the order they are checked): | |
230 | # (1) - due to target is PHONY | |
231 | # (2) - due to target missing | |
232 | # (3) - due to: file1.h file2.h | |
233 | # (4) - due to command line change | |
234 | # (5) - due to missing .cmd file | |
235 | # (6) - due to target not in $(targets) | |
236 | # (1) PHONY targets are always build | |
237 | # (2) No target, so we better build it | |
238 | # (3) Prerequisite is newer than target | |
239 | # (4) The command line stored in the file named dir/.target.cmd | |
240 | # differed from actual command line. This happens when compiler | |
241 | # options changes | |
242 | # (5) No dir/.target.cmd file (used to store command line) | |
243 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
244 | # This is a good hint that there is a bug in the kbuild file | |
245 | ifeq ($(KBUILD_VERBOSE),2) | |
246 | why = \ | |
247 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
248 | $(if $(wildcard $@), \ | |
eba19032 | 249 | $(if $(newer-prereqs),- due to: $(newer-prereqs), \ |
50bcca6a | 250 | $(if $(cmd-check), \ |
45d506bd SR |
251 | $(if $(cmd_$@),- due to command line change, \ |
252 | $(if $(filter $@, $(targets)), \ | |
253 | - due to missing .cmd file, \ | |
254 | - due to $(notdir $@) not in $$(targets) \ | |
255 | ) \ | |
256 | ) \ | |
257 | ) \ | |
258 | ), \ | |
259 | - due to target missing \ | |
260 | ) \ | |
261 | ) | |
262 | ||
263 | echo-why = $(call escsq, $(strip $(why))) | |
264 | endif | |
3ee550f1 DW |
265 | |
266 | ############################################################################### | |
267 | # | |
268 | # When a Kconfig string contains a filename, it is suitable for | |
269 | # passing to shell commands. It is surrounded by double-quotes, and | |
270 | # any double-quotes or backslashes within it are escaped by | |
271 | # backslashes. | |
272 | # | |
273 | # This is no use for dependencies or $(wildcard). We need to strip the | |
274 | # surrounding quotes and the escaping from quotes and backslashes, and | |
275 | # we *do* need to escape any spaces in the string. So, for example: | |
276 | # | |
277 | # Usage: $(eval $(call config_filename,FOO)) | |
278 | # | |
279 | # Defines FOO_FILENAME based on the contents of the CONFIG_FOO option, | |
280 | # transformed as described above to be suitable for use within the | |
281 | # makefile. | |
282 | # | |
283 | # Also, if the filename is a relative filename and exists in the source | |
284 | # tree but not the build tree, define FOO_SRCPREFIX as $(srctree)/ to | |
285 | # be prefixed to *both* command invocation and dependencies. | |
286 | # | |
287 | # Note: We also print the filenames in the quiet_cmd_foo text, and | |
288 | # perhaps ought to have a version specially escaped for that purpose. | |
289 | # But it's only cosmetic, and $(patsubst "%",%,$(CONFIG_FOO)) is good | |
290 | # enough. It'll strip the quotes in the common case where there's no | |
291 | # space and it's a simple filename, and it'll retain the quotes when | |
292 | # there's a space. There are some esoteric cases in which it'll print | |
293 | # the wrong thing, but we don't really care. The actual dependencies | |
294 | # and commands *do* get it right, with various combinations of single | |
295 | # and double quotes, backslashes and spaces in the filenames. | |
296 | # | |
297 | ############################################################################### | |
298 | # | |
3ee550f1 DW |
299 | define config_filename |
300 | ifneq ($$(CONFIG_$(1)),"") | |
301 | $(1)_FILENAME := $$(subst \\,\,$$(subst \$$(quote),$$(quote),$$(subst $$(space_escape),\$$(space),$$(patsubst "%",%,$$(subst $$(space),$$(space_escape),$$(CONFIG_$(1))))))) | |
302 | ifneq ($$(patsubst /%,%,$$(firstword $$($(1)_FILENAME))),$$(firstword $$($(1)_FILENAME))) | |
303 | else | |
304 | ifeq ($$(wildcard $$($(1)_FILENAME)),) | |
305 | ifneq ($$(wildcard $$(srctree)/$$($(1)_FILENAME)),) | |
306 | $(1)_SRCPREFIX := $(srctree)/ | |
307 | endif | |
308 | endif | |
309 | endif | |
310 | endif | |
311 | endef | |
312 | # | |
313 | ############################################################################### | |
9c2af1c7 MY |
314 | |
315 | # delete partially updated (i.e. corrupted) files on error | |
316 | .DELETE_ON_ERROR: | |
8e9b61b2 MY |
317 | |
318 | # do not delete intermediate files automatically | |
319 | .SECONDARY: |