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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 | ||
8ec4b4ff SR |
27 | ### |
28 | # filechk is used to check if the content of a generated file is updated. | |
29 | # Sample usage: | |
30 | # define filechk_sample | |
31 | # echo $KERNELRELEASE | |
32 | # endef | |
33 | # version.h : Makefile | |
34 | # $(call filechk,sample) | |
35 | # The rule defined shall write to stdout the content of the new file. | |
36 | # The existing file will be compared with the new one. | |
37 | # - If no file exist it is created | |
38 | # - If the content differ the new file is used | |
39 | # - If they are equal no change, and no timestamp update | |
40 | # - stdin is piped in from the first prerequisite ($<) so one has | |
41 | # to specify a valid file as first prerequisite (often the kbuild file) | |
42 | define filechk | |
43 | $(Q)set -e; \ | |
44 | echo ' CHK $@'; \ | |
45 | mkdir -p $(dir $@); \ | |
46 | $(filechk_$(1)) < $< > $@.tmp; \ | |
47 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ | |
48 | rm -f $@.tmp; \ | |
49 | else \ | |
50 | echo ' UPD $@'; \ | |
51 | mv -f $@.tmp $@; \ | |
52 | fi | |
53 | endef | |
54 | ||
20a468b5 | 55 | ###### |
9d6e7a70 | 56 | # gcc support functions |
20a468b5 SR |
57 | # See documentation in Documentation/kbuild/makefiles.txt |
58 | ||
beda9f3a RZ |
59 | # output directory for tests below |
60 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) | |
61 | ||
62 | # try-run | |
63 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
64 | # Exit code chooses option. "$$TMP" is can be used as temporary file and | |
65 | # is automatically cleaned up. | |
66 | try-run = $(shell set -e; \ | |
67 | TMP="$(TMPOUT).$$$$.tmp"; \ | |
68 | if ($(1)) >/dev/null 2>&1; \ | |
69 | then echo "$(2)"; \ | |
70 | else echo "$(3)"; \ | |
71 | fi; \ | |
72 | rm -f "$$TMP") | |
347a00fb | 73 | |
20a468b5 | 74 | # as-option |
bff288c1 | 75 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a RZ |
76 | |
77 | as-option = $(call try-run,\ | |
78 | $(CC) $(CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) | |
20a468b5 | 79 | |
e2414910 | 80 | # as-instr |
bff288c1 | 81 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a RZ |
82 | |
83 | as-instr = $(call try-run,\ | |
84 | echo -e "$(1)" | $(CC) $(AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) | |
e2414910 | 85 | |
20a468b5 | 86 | # cc-option |
bff288c1 | 87 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a RZ |
88 | |
89 | cc-option = $(call try-run,\ | |
90 | $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",$(1),$(2)) | |
20a468b5 SR |
91 | |
92 | # cc-option-yn | |
bff288c1 | 93 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
beda9f3a RZ |
94 | cc-option-yn = $(call try-run,\ |
95 | $(CC) $(CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n) | |
20a468b5 SR |
96 | |
97 | # cc-option-align | |
98 | # Prefix align with either -falign or -malign | |
99 | cc-option-align = $(subst -functions=0,,\ | |
beda9f3a | 100 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
20a468b5 SR |
101 | |
102 | # cc-version | |
0ab2a272 | 103 | # Usage gcc-ver := $(call cc-version) |
8eb3afe0 | 104 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 | 105 | |
0ab2a272 SB |
106 | # cc-fullversion |
107 | # Usage gcc-ver := $(call cc-fullversion) | |
108 | cc-fullversion = $(shell $(CONFIG_SHELL) \ | |
109 | $(srctree)/scripts/gcc-version.sh -p $(CC)) | |
110 | ||
20a468b5 SR |
111 | # cc-ifversion |
112 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
5de043f4 | 113 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
20a468b5 | 114 | |
0b0bf7a3 RM |
115 | # ld-option |
116 | # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) | |
beda9f3a RZ |
117 | ld-option = $(call try-run,\ |
118 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) | |
5de043f4 OV |
119 | |
120 | ###### | |
0b0bf7a3 | 121 | |
beda9f3a | 122 | ### |
8ec4b4ff SR |
123 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
124 | # Usage: | |
125 | # $(Q)$(MAKE) $(build)=dir | |
126 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
127 | ||
beda9f3a RZ |
128 | # Prefix -I with $(srctree) if it is not an absolute path. |
129 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | |
5de043f4 | 130 | |
d9df92e2 | 131 | # Find all -I options and call addtree |
beda9f3a | 132 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
d9df92e2 | 133 | |
5de043f4 OV |
134 | # echo command. |
135 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 136 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
137 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
138 | ||
139 | # printing commands | |
6176aa9a | 140 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 141 | |
5de043f4 | 142 | # Add $(obj)/ for paths that are not absolute |
bff288c1 | 143 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
0a504f25 | 144 | |
8ec4b4ff | 145 | ### |
5de043f4 | 146 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
147 | # target, or command line has changed |
148 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
149 | # including used config symbols | |
150 | # if_changed_rule - as if_changed but execute rule instead | |
151 | # See Documentation/kbuild/makefiles.txt for more info | |
152 | ||
153 | ifneq ($(KBUILD_NOCMDDEP),1) | |
beda9f3a | 154 | # Check if both arguments has same arguments. Result is empty string if equal. |
8ec4b4ff | 155 | # User may override this check using make KBUILD_NOCMDDEP=1 |
48f1f058 SR |
156 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
157 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
8ec4b4ff SR |
158 | endif |
159 | ||
48f1f058 SR |
160 | # >'< substitution is for echo to work, |
161 | # >$< substitution to preserve $ when reloading .cmd file | |
162 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
163 | # in $(cmd_xxx) double $$ your perl vars | |
6176aa9a JB |
164 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
165 | ||
48f1f058 SR |
166 | # Find any prerequisites that is newer than target or that does not exist. |
167 | # PHONY targets skipped in both cases. | |
168 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
169 | ||
5de043f4 | 170 | # Execute command if command has changed or prerequisite(s) are updated. |
4f193362 | 171 | # |
48f1f058 SR |
172 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
173 | @set -e; \ | |
174 | $(echo-cmd) $(cmd_$(1)); \ | |
175 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff | 176 | |
5de043f4 | 177 | # Execute the command and also postprocess generated .d dependencies file. |
48f1f058 SR |
178 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
179 | @set -e; \ | |
180 | $(echo-cmd) $(cmd_$(1)); \ | |
181 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
182 | rm -f $(depfile); \ | |
183 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
184 | |
185 | # Usage: $(call if_changed_rule,foo) | |
beda9f3a RZ |
186 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
187 | # and if so will execute $(rule_foo). | |
48f1f058 SR |
188 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
189 | @set -e; \ | |
190 | $(rule_$(1))) | |
191 | ||
45d506bd SR |
192 | ### |
193 | # why - tell why a a target got build | |
194 | # enabled by make V=2 | |
195 | # Output (listed in the order they are checked): | |
196 | # (1) - due to target is PHONY | |
197 | # (2) - due to target missing | |
198 | # (3) - due to: file1.h file2.h | |
199 | # (4) - due to command line change | |
200 | # (5) - due to missing .cmd file | |
201 | # (6) - due to target not in $(targets) | |
202 | # (1) PHONY targets are always build | |
203 | # (2) No target, so we better build it | |
204 | # (3) Prerequisite is newer than target | |
205 | # (4) The command line stored in the file named dir/.target.cmd | |
206 | # differed from actual command line. This happens when compiler | |
207 | # options changes | |
208 | # (5) No dir/.target.cmd file (used to store command line) | |
209 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
210 | # This is a good hint that there is a bug in the kbuild file | |
211 | ifeq ($(KBUILD_VERBOSE),2) | |
212 | why = \ | |
213 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
214 | $(if $(wildcard $@), \ | |
215 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
216 | $(if $(arg-check), \ | |
217 | $(if $(cmd_$@),- due to command line change, \ | |
218 | $(if $(filter $@, $(targets)), \ | |
219 | - due to missing .cmd file, \ | |
220 | - due to $(notdir $@) not in $$(targets) \ | |
221 | ) \ | |
222 | ) \ | |
223 | ) \ | |
224 | ), \ | |
225 | - due to target missing \ | |
226 | ) \ | |
227 | ) | |
228 | ||
229 | echo-why = $(call escsq, $(strip $(why))) | |
230 | endif |