Commit | Line | Data |
---|---|---|
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) | |
10 | ||
48f1f058 SR |
11 | ### |
12 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
13 | dot-target = $(dir $@).$(notdir $@) | |
14 | ||
8ec4b4ff SR |
15 | ### |
16 | # The temporary file to save gcc -MD generated dependencies must not | |
17 | # contain a comma | |
48f1f058 | 18 | depfile = $(subst $(comma),_,$(dot-target).d) |
8ec4b4ff | 19 | |
5e8d780d SR |
20 | ### |
21 | # filename of target with directory and extension stripped | |
22 | basetarget = $(basename $(notdir $@)) | |
23 | ||
e0318d85 AL |
24 | ### |
25 | # filename of first prerequisite with directory and extension stripped | |
26 | baseprereq = $(basename $(notdir $<)) | |
27 | ||
d51bfb78 SR |
28 | ### |
29 | # Escape single quote for use in echo statements | |
30 | escsq = $(subst $(squote),'\$(squote)',$1) | |
31 | ||
5410ecc0 MF |
32 | ### |
33 | # Easy method for doing a status message | |
34 | kecho := : | |
35 | quiet_kecho := echo | |
36 | silent_kecho := : | |
37 | kecho := $($(quiet)kecho) | |
38 | ||
8ec4b4ff SR |
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; \ | |
fd54f502 | 56 | $(kecho) ' CHK $@'; \ |
8ec4b4ff SR |
57 | mkdir -p $(dir $@); \ |
58 | $(filechk_$(1)) < $< > $@.tmp; \ | |
59 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ | |
60 | rm -f $@.tmp; \ | |
61 | else \ | |
fd54f502 | 62 | $(kecho) ' UPD $@'; \ |
8ec4b4ff SR |
63 | mv -f $@.tmp $@; \ |
64 | fi | |
65 | endef | |
66 | ||
20a468b5 | 67 | ###### |
9d6e7a70 | 68 | # gcc support functions |
20a468b5 SR |
69 | # See documentation in Documentation/kbuild/makefiles.txt |
70 | ||
910b4046 SR |
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 | ||
beda9f3a RZ |
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).$$$$.tmp"; \ | |
691ef3e7 | 91 | TMPO="$(TMPOUT).$$$$.o"; \ |
beda9f3a RZ |
92 | if ($(1)) >/dev/null 2>&1; \ |
93 | then echo "$(2)"; \ | |
94 | else echo "$(3)"; \ | |
95 | fi; \ | |
691ef3e7 | 96 | rm -f "$$TMP" "$$TMPO") |
347a00fb | 97 | |
20a468b5 | 98 | # as-option |
bff288c1 | 99 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a RZ |
100 | |
101 | as-option = $(call try-run,\ | |
b1e0d8b7 | 102 | $(CC) $(KBUILD_CFLAGS) $(1) -c -x assembler /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 | 103 | |
e2414910 | 104 | # as-instr |
bff288c1 | 105 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a RZ |
106 | |
107 | as-instr = $(call try-run,\ | |
b1e0d8b7 | 108 | printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
e2414910 | 109 | |
20a468b5 | 110 | # cc-option |
bff288c1 | 111 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a RZ |
112 | |
113 | cc-option = $(call try-run,\ | |
b1e0d8b7 | 114 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 SR |
115 | |
116 | # cc-option-yn | |
bff288c1 | 117 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
beda9f3a | 118 | cc-option-yn = $(call try-run,\ |
b1e0d8b7 | 119 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) |
20a468b5 SR |
120 | |
121 | # cc-option-align | |
122 | # Prefix align with either -falign or -malign | |
123 | cc-option-align = $(subst -functions=0,,\ | |
beda9f3a | 124 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
20a468b5 | 125 | |
8417da6f MM |
126 | # cc-disable-warning |
127 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) | |
128 | cc-disable-warning = $(call try-run,\ | |
b1e0d8b7 | 129 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
8417da6f | 130 | |
20a468b5 | 131 | # cc-version |
0ab2a272 | 132 | # Usage gcc-ver := $(call cc-version) |
8eb3afe0 | 133 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 | 134 | |
0ab2a272 SB |
135 | # cc-fullversion |
136 | # Usage gcc-ver := $(call cc-fullversion) | |
137 | cc-fullversion = $(shell $(CONFIG_SHELL) \ | |
138 | $(srctree)/scripts/gcc-version.sh -p $(CC)) | |
139 | ||
20a468b5 SR |
140 | # cc-ifversion |
141 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
5de043f4 | 142 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
20a468b5 | 143 | |
f86fd306 SR |
144 | # cc-ldoption |
145 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) | |
146 | cc-ldoption = $(call try-run,\ | |
b1e0d8b7 | 147 | $(CC) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) |
5de043f4 | 148 | |
691ef3e7 SR |
149 | # ld-option |
150 | # Usage: LDFLAGS += $(call ld-option, -X) | |
151 | ld-option = $(call try-run,\ | |
5b83df2b | 152 | $(CC) -x c /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
691ef3e7 | 153 | |
40df759e MM |
154 | # ar-option |
155 | # Usage: KBUILD_ARFLAGS := $(call ar-option,D) | |
156 | # Important: no spaces around options | |
157 | ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) | |
158 | ||
ccbef167 AK |
159 | # ld-version |
160 | # Usage: $(call ld-version) | |
161 | # Note this is mainly for HJ Lu's 3 number binutil versions | |
162 | ld-version = $(shell $(LD) --version | $(srctree)/scripts/ld-version.sh) | |
163 | ||
164 | # ld-ifversion | |
165 | # Usage: $(call ld-ifversion, -ge, 22252, y) | |
166 | ld-ifversion = $(shell [ $(call ld-version) $(1) $(2) ] && echo $(3)) | |
167 | ||
5de043f4 | 168 | ###### |
0b0bf7a3 | 169 | |
beda9f3a | 170 | ### |
8ec4b4ff SR |
171 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
172 | # Usage: | |
173 | # $(Q)$(MAKE) $(build)=dir | |
174 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
175 | ||
bc081dd6 MM |
176 | ### |
177 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= | |
178 | # Usage: | |
179 | # $(Q)$(MAKE) $(modbuiltin)=dir | |
180 | modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj | |
181 | ||
beda9f3a | 182 | # Prefix -I with $(srctree) if it is not an absolute path. |
5b91c33c SR |
183 | # skip if -I has no parameter |
184 | addtree = $(if $(patsubst -I%,%,$(1)), \ | |
185 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) | |
5de043f4 | 186 | |
d9df92e2 | 187 | # Find all -I options and call addtree |
beda9f3a | 188 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
d9df92e2 | 189 | |
5de043f4 OV |
190 | # echo command. |
191 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 192 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
193 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
194 | ||
195 | # printing commands | |
6176aa9a | 196 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 197 | |
5de043f4 | 198 | # Add $(obj)/ for paths that are not absolute |
bff288c1 | 199 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
0a504f25 | 200 | |
8ec4b4ff | 201 | ### |
5de043f4 | 202 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
203 | # target, or command line has changed |
204 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
205 | # including used config symbols | |
206 | # if_changed_rule - as if_changed but execute rule instead | |
207 | # See Documentation/kbuild/makefiles.txt for more info | |
208 | ||
209 | ifneq ($(KBUILD_NOCMDDEP),1) | |
beda9f3a | 210 | # Check if both arguments has same arguments. Result is empty string if equal. |
8ec4b4ff | 211 | # User may override this check using make KBUILD_NOCMDDEP=1 |
48f1f058 SR |
212 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
213 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
c4d5ee13 MM |
214 | else |
215 | arg-check = $(if $(strip $(cmd_$@)),,1) | |
8ec4b4ff SR |
216 | endif |
217 | ||
48f1f058 SR |
218 | # >'< substitution is for echo to work, |
219 | # >$< substitution to preserve $ when reloading .cmd file | |
220 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
221 | # in $(cmd_xxx) double $$ your perl vars | |
c353acba | 222 | make-cmd = $(subst \\,\\\\,$(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1)))))) |
6176aa9a | 223 | |
48f1f058 SR |
224 | # Find any prerequisites that is newer than target or that does not exist. |
225 | # PHONY targets skipped in both cases. | |
226 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
227 | ||
5de043f4 | 228 | # Execute command if command has changed or prerequisite(s) are updated. |
4f193362 | 229 | # |
48f1f058 SR |
230 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
231 | @set -e; \ | |
232 | $(echo-cmd) $(cmd_$(1)); \ | |
233 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff | 234 | |
5de043f4 | 235 | # Execute the command and also postprocess generated .d dependencies file. |
48f1f058 SR |
236 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
237 | @set -e; \ | |
238 | $(echo-cmd) $(cmd_$(1)); \ | |
239 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
240 | rm -f $(depfile); \ | |
241 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
242 | |
243 | # Usage: $(call if_changed_rule,foo) | |
beda9f3a RZ |
244 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
245 | # and if so will execute $(rule_foo). | |
48f1f058 SR |
246 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
247 | @set -e; \ | |
248 | $(rule_$(1))) | |
249 | ||
45d506bd SR |
250 | ### |
251 | # why - tell why a a target got build | |
252 | # enabled by make V=2 | |
253 | # Output (listed in the order they are checked): | |
254 | # (1) - due to target is PHONY | |
255 | # (2) - due to target missing | |
256 | # (3) - due to: file1.h file2.h | |
257 | # (4) - due to command line change | |
258 | # (5) - due to missing .cmd file | |
259 | # (6) - due to target not in $(targets) | |
260 | # (1) PHONY targets are always build | |
261 | # (2) No target, so we better build it | |
262 | # (3) Prerequisite is newer than target | |
263 | # (4) The command line stored in the file named dir/.target.cmd | |
264 | # differed from actual command line. This happens when compiler | |
265 | # options changes | |
266 | # (5) No dir/.target.cmd file (used to store command line) | |
267 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
268 | # This is a good hint that there is a bug in the kbuild file | |
269 | ifeq ($(KBUILD_VERBOSE),2) | |
270 | why = \ | |
271 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
272 | $(if $(wildcard $@), \ | |
273 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
274 | $(if $(arg-check), \ | |
275 | $(if $(cmd_$@),- due to command line change, \ | |
276 | $(if $(filter $@, $(targets)), \ | |
277 | - due to missing .cmd file, \ | |
278 | - due to $(notdir $@) not in $$(targets) \ | |
279 | ) \ | |
280 | ) \ | |
281 | ) \ | |
282 | ), \ | |
283 | - due to target missing \ | |
284 | ) \ | |
285 | ) | |
286 | ||
287 | echo-why = $(call escsq, $(strip $(why))) | |
288 | endif |