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8ec4b4ff SR |
1 | #### |
2 | # kbuild: Generic definitions | |
3 | ||
beda9f3a | 4 | # Convenient variables |
8ec4b4ff | 5 | comma := , |
d51bfb78 | 6 | squote := ' |
8ec4b4ff SR |
7 | empty := |
8 | space := $(empty) $(empty) | |
9 | ||
48f1f058 SR |
10 | ### |
11 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o | |
12 | dot-target = $(dir $@).$(notdir $@) | |
13 | ||
8ec4b4ff SR |
14 | ### |
15 | # The temporary file to save gcc -MD generated dependencies must not | |
16 | # contain a comma | |
48f1f058 | 17 | depfile = $(subst $(comma),_,$(dot-target).d) |
8ec4b4ff | 18 | |
5e8d780d SR |
19 | ### |
20 | # filename of target with directory and extension stripped | |
21 | basetarget = $(basename $(notdir $@)) | |
22 | ||
d51bfb78 SR |
23 | ### |
24 | # Escape single quote for use in echo statements | |
25 | escsq = $(subst $(squote),'\$(squote)',$1) | |
26 | ||
5410ecc0 MF |
27 | ### |
28 | # Easy method for doing a status message | |
29 | kecho := : | |
30 | quiet_kecho := echo | |
31 | silent_kecho := : | |
32 | kecho := $($(quiet)kecho) | |
33 | ||
8ec4b4ff SR |
34 | ### |
35 | # filechk is used to check if the content of a generated file is updated. | |
36 | # Sample usage: | |
37 | # define filechk_sample | |
38 | # echo $KERNELRELEASE | |
39 | # endef | |
40 | # version.h : Makefile | |
41 | # $(call filechk,sample) | |
42 | # The rule defined shall write to stdout the content of the new file. | |
43 | # The existing file will be compared with the new one. | |
44 | # - If no file exist it is created | |
45 | # - If the content differ the new file is used | |
46 | # - If they are equal no change, and no timestamp update | |
47 | # - stdin is piped in from the first prerequisite ($<) so one has | |
48 | # to specify a valid file as first prerequisite (often the kbuild file) | |
49 | define filechk | |
50 | $(Q)set -e; \ | |
fd54f502 | 51 | $(kecho) ' CHK $@'; \ |
8ec4b4ff SR |
52 | mkdir -p $(dir $@); \ |
53 | $(filechk_$(1)) < $< > $@.tmp; \ | |
54 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ | |
55 | rm -f $@.tmp; \ | |
56 | else \ | |
fd54f502 | 57 | $(kecho) ' UPD $@'; \ |
8ec4b4ff SR |
58 | mv -f $@.tmp $@; \ |
59 | fi | |
60 | endef | |
61 | ||
20a468b5 | 62 | ###### |
9d6e7a70 | 63 | # gcc support functions |
20a468b5 SR |
64 | # See documentation in Documentation/kbuild/makefiles.txt |
65 | ||
910b4046 SR |
66 | # cc-cross-prefix |
67 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
68 | # Return first prefix where a prefix$(CC) is found in PATH. | |
69 | # If no $(CC) found in PATH with listed prefixes return nothing | |
70 | cc-cross-prefix = \ | |
71 | $(word 1, $(foreach c,$(1), \ | |
72 | $(shell set -e; \ | |
73 | if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ | |
74 | echo $(c); \ | |
75 | fi))) | |
76 | ||
beda9f3a RZ |
77 | # output directory for tests below |
78 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) | |
79 | ||
80 | # try-run | |
81 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
82 | # Exit code chooses option. "$$TMP" is can be used as temporary file and | |
83 | # is automatically cleaned up. | |
84 | try-run = $(shell set -e; \ | |
85 | TMP="$(TMPOUT).$$$$.tmp"; \ | |
86 | if ($(1)) >/dev/null 2>&1; \ | |
87 | then echo "$(2)"; \ | |
88 | else echo "$(3)"; \ | |
89 | fi; \ | |
90 | rm -f "$$TMP") | |
347a00fb | 91 | |
20a468b5 | 92 | # as-option |
bff288c1 | 93 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a RZ |
94 | |
95 | as-option = $(call try-run,\ | |
a0f97e06 | 96 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 | 97 | |
e2414910 | 98 | # as-instr |
bff288c1 | 99 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a RZ |
100 | |
101 | as-instr = $(call try-run,\ | |
222d394d | 102 | echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
e2414910 | 103 | |
20a468b5 | 104 | # cc-option |
bff288c1 | 105 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a RZ |
106 | |
107 | cc-option = $(call try-run,\ | |
43789e21 | 108 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 SR |
109 | |
110 | # cc-option-yn | |
bff288c1 | 111 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
beda9f3a | 112 | cc-option-yn = $(call try-run,\ |
43789e21 | 113 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) |
20a468b5 SR |
114 | |
115 | # cc-option-align | |
116 | # Prefix align with either -falign or -malign | |
117 | cc-option-align = $(subst -functions=0,,\ | |
beda9f3a | 118 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
20a468b5 SR |
119 | |
120 | # cc-version | |
0ab2a272 | 121 | # Usage gcc-ver := $(call cc-version) |
8eb3afe0 | 122 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 | 123 | |
0ab2a272 SB |
124 | # cc-fullversion |
125 | # Usage gcc-ver := $(call cc-fullversion) | |
126 | cc-fullversion = $(shell $(CONFIG_SHELL) \ | |
127 | $(srctree)/scripts/gcc-version.sh -p $(CC)) | |
128 | ||
20a468b5 SR |
129 | # cc-ifversion |
130 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
5de043f4 | 131 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
20a468b5 | 132 | |
0b0bf7a3 RM |
133 | # ld-option |
134 | # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) | |
beda9f3a RZ |
135 | ld-option = $(call try-run,\ |
136 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) | |
5de043f4 OV |
137 | |
138 | ###### | |
0b0bf7a3 | 139 | |
beda9f3a | 140 | ### |
8ec4b4ff SR |
141 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
142 | # Usage: | |
143 | # $(Q)$(MAKE) $(build)=dir | |
144 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
145 | ||
beda9f3a | 146 | # Prefix -I with $(srctree) if it is not an absolute path. |
5b91c33c SR |
147 | # skip if -I has no parameter |
148 | addtree = $(if $(patsubst -I%,%,$(1)), \ | |
149 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) | |
5de043f4 | 150 | |
d9df92e2 | 151 | # Find all -I options and call addtree |
beda9f3a | 152 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
d9df92e2 | 153 | |
5de043f4 OV |
154 | # echo command. |
155 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 156 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
157 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
158 | ||
159 | # printing commands | |
6176aa9a | 160 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 161 | |
5de043f4 | 162 | # Add $(obj)/ for paths that are not absolute |
bff288c1 | 163 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
0a504f25 | 164 | |
8ec4b4ff | 165 | ### |
5de043f4 | 166 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
167 | # target, or command line has changed |
168 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
169 | # including used config symbols | |
170 | # if_changed_rule - as if_changed but execute rule instead | |
171 | # See Documentation/kbuild/makefiles.txt for more info | |
172 | ||
173 | ifneq ($(KBUILD_NOCMDDEP),1) | |
beda9f3a | 174 | # Check if both arguments has same arguments. Result is empty string if equal. |
8ec4b4ff | 175 | # User may override this check using make KBUILD_NOCMDDEP=1 |
48f1f058 SR |
176 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
177 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
8ec4b4ff SR |
178 | endif |
179 | ||
48f1f058 SR |
180 | # >'< substitution is for echo to work, |
181 | # >$< substitution to preserve $ when reloading .cmd file | |
182 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
183 | # in $(cmd_xxx) double $$ your perl vars | |
6176aa9a JB |
184 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
185 | ||
48f1f058 SR |
186 | # Find any prerequisites that is newer than target or that does not exist. |
187 | # PHONY targets skipped in both cases. | |
188 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
189 | ||
5de043f4 | 190 | # Execute command if command has changed or prerequisite(s) are updated. |
4f193362 | 191 | # |
48f1f058 SR |
192 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
193 | @set -e; \ | |
194 | $(echo-cmd) $(cmd_$(1)); \ | |
195 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff | 196 | |
5de043f4 | 197 | # Execute the command and also postprocess generated .d dependencies file. |
48f1f058 SR |
198 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
199 | @set -e; \ | |
200 | $(echo-cmd) $(cmd_$(1)); \ | |
201 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
202 | rm -f $(depfile); \ | |
203 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
204 | |
205 | # Usage: $(call if_changed_rule,foo) | |
beda9f3a RZ |
206 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
207 | # and if so will execute $(rule_foo). | |
48f1f058 SR |
208 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
209 | @set -e; \ | |
210 | $(rule_$(1))) | |
211 | ||
45d506bd SR |
212 | ### |
213 | # why - tell why a a target got build | |
214 | # enabled by make V=2 | |
215 | # Output (listed in the order they are checked): | |
216 | # (1) - due to target is PHONY | |
217 | # (2) - due to target missing | |
218 | # (3) - due to: file1.h file2.h | |
219 | # (4) - due to command line change | |
220 | # (5) - due to missing .cmd file | |
221 | # (6) - due to target not in $(targets) | |
222 | # (1) PHONY targets are always build | |
223 | # (2) No target, so we better build it | |
224 | # (3) Prerequisite is newer than target | |
225 | # (4) The command line stored in the file named dir/.target.cmd | |
226 | # differed from actual command line. This happens when compiler | |
227 | # options changes | |
228 | # (5) No dir/.target.cmd file (used to store command line) | |
229 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
230 | # This is a good hint that there is a bug in the kbuild file | |
231 | ifeq ($(KBUILD_VERBOSE),2) | |
232 | why = \ | |
233 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
234 | $(if $(wildcard $@), \ | |
235 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
236 | $(if $(arg-check), \ | |
237 | $(if $(cmd_$@),- due to command line change, \ | |
238 | $(if $(filter $@, $(targets)), \ | |
239 | - due to missing .cmd file, \ | |
240 | - due to $(notdir $@) not in $$(targets) \ | |
241 | ) \ | |
242 | ) \ | |
243 | ) \ | |
244 | ), \ | |
245 | - due to target missing \ | |
246 | ) \ | |
247 | ) | |
248 | ||
249 | echo-why = $(call escsq, $(strip $(why))) | |
250 | endif |