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1 | #### |
2 | # kbuild: Generic definitions |
3 | |
4 | # Convenient variables |
5 | comma := , |
6 | squote := ' |
7 | empty := |
8 | space := $(empty) $(empty) |
9 | |
10 | ### |
11 | # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o |
12 | dot-target = $(dir $@).$(notdir $@) |
13 | |
14 | ### |
15 | # The temporary file to save gcc -MD generated dependencies must not |
16 | # contain a comma |
17 | depfile = $(subst $(comma),_,$(dot-target).d) |
18 | |
19 | ### |
20 | # filename of target with directory and extension stripped |
21 | basetarget = $(basename $(notdir $@)) |
22 | |
23 | ### |
24 | # Escape single quote for use in echo statements |
25 | escsq = $(subst $(squote),'\$(squote)',$1) |
26 | |
27 | ### |
28 | # Easy method for doing a status message |
29 | kecho := : |
30 | quiet_kecho := echo |
31 | silent_kecho := : |
32 | kecho := $($(quiet)kecho) |
33 | |
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; \ |
51 | $(kecho) ' CHK $@'; \ |
52 | mkdir -p $(dir $@); \ |
53 | $(filechk_$(1)) < $< > $@.tmp; \ |
54 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
55 | rm -f $@.tmp; \ |
56 | else \ |
57 | $(kecho) ' UPD $@'; \ |
58 | mv -f $@.tmp $@; \ |
59 | fi |
60 | endef |
61 | |
62 | ###### |
63 | # gcc support functions |
64 | # See documentation in Documentation/kbuild/makefiles.txt |
65 | |
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 | |
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).$$$$.tmp"; \ |
86 | TMPO="$(TMPOUT).$$$$.o"; \ |
87 | if ($(1)) >/dev/null 2>&1; \ |
88 | then echo "$(2)"; \ |
89 | else echo "$(3)"; \ |
90 | fi; \ |
91 | rm -f "$$TMP" "$$TMPO") |
92 | |
93 | # as-option |
94 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
95 | |
96 | as-option = $(call try-run,\ |
97 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
98 | |
99 | # as-instr |
100 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
101 | |
102 | as-instr = $(call try-run,\ |
103 | /bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
104 | |
105 | # cc-option |
106 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
107 | |
108 | cc-option = $(call try-run,\ |
109 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) |
110 | |
111 | # cc-option-yn |
112 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
113 | cc-option-yn = $(call try-run,\ |
114 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) |
115 | |
116 | # cc-option-align |
117 | # Prefix align with either -falign or -malign |
118 | cc-option-align = $(subst -functions=0,,\ |
119 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
120 | |
121 | # cc-version |
122 | # Usage gcc-ver := $(call cc-version) |
123 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
124 | |
125 | # cc-fullversion |
126 | # Usage gcc-ver := $(call cc-fullversion) |
127 | cc-fullversion = $(shell $(CONFIG_SHELL) \ |
128 | $(srctree)/scripts/gcc-version.sh -p $(CC)) |
129 | |
130 | # cc-ifversion |
131 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
132 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
133 | |
134 | # cc-ldoption |
135 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
136 | cc-ldoption = $(call try-run,\ |
137 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) |
138 | |
139 | # ld-option |
140 | # Usage: LDFLAGS += $(call ld-option, -X) |
141 | ld-option = $(call try-run,\ |
142 | $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
143 | |
144 | ###### |
145 | |
146 | ### |
147 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
148 | # Usage: |
149 | # $(Q)$(MAKE) $(build)=dir |
150 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
151 | |
152 | ### |
153 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
154 | # Usage: |
155 | # $(Q)$(MAKE) $(modbuiltin)=dir |
156 | modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj |
157 | |
158 | # Prefix -I with $(srctree) if it is not an absolute path. |
159 | # skip if -I has no parameter |
160 | addtree = $(if $(patsubst -I%,%,$(1)), \ |
161 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) |
162 | |
163 | # Find all -I options and call addtree |
164 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
165 | |
166 | # echo command. |
167 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
168 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
169 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
170 | |
171 | # printing commands |
172 | cmd = @$(echo-cmd) $(cmd_$(1)) |
173 | |
174 | # Add $(obj)/ for paths that are not absolute |
175 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
176 | |
177 | ### |
178 | # if_changed - execute command if any prerequisite is newer than |
179 | # target, or command line has changed |
180 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
181 | # including used config symbols |
182 | # if_changed_rule - as if_changed but execute rule instead |
183 | # See Documentation/kbuild/makefiles.txt for more info |
184 | |
185 | ifneq ($(KBUILD_NOCMDDEP),1) |
186 | # Check if both arguments has same arguments. Result is empty string if equal. |
187 | # User may override this check using make KBUILD_NOCMDDEP=1 |
188 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
189 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) |
190 | endif |
191 | |
192 | # >'< substitution is for echo to work, |
193 | # >$< substitution to preserve $ when reloading .cmd file |
194 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] |
195 | # in $(cmd_xxx) double $$ your perl vars |
196 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
197 | |
198 | # Find any prerequisites that is newer than target or that does not exist. |
199 | # PHONY targets skipped in both cases. |
200 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
201 | |
202 | # Execute command if command has changed or prerequisite(s) are updated. |
203 | # |
204 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
205 | @set -e; \ |
206 | $(echo-cmd) $(cmd_$(1)); \ |
207 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
208 | |
209 | # Execute the command and also postprocess generated .d dependencies file. |
210 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
211 | @set -e; \ |
212 | $(echo-cmd) $(cmd_$(1)); \ |
213 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ |
214 | rm -f $(depfile); \ |
215 | mv -f $(dot-target).tmp $(dot-target).cmd) |
216 | |
217 | # Usage: $(call if_changed_rule,foo) |
218 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
219 | # and if so will execute $(rule_foo). |
220 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
221 | @set -e; \ |
222 | $(rule_$(1))) |
223 | |
224 | ### |
225 | # why - tell why a a target got build |
226 | # enabled by make V=2 |
227 | # Output (listed in the order they are checked): |
228 | # (1) - due to target is PHONY |
229 | # (2) - due to target missing |
230 | # (3) - due to: file1.h file2.h |
231 | # (4) - due to command line change |
232 | # (5) - due to missing .cmd file |
233 | # (6) - due to target not in $(targets) |
234 | # (1) PHONY targets are always build |
235 | # (2) No target, so we better build it |
236 | # (3) Prerequisite is newer than target |
237 | # (4) The command line stored in the file named dir/.target.cmd |
238 | # differed from actual command line. This happens when compiler |
239 | # options changes |
240 | # (5) No dir/.target.cmd file (used to store command line) |
241 | # (6) No dir/.target.cmd file and target not listed in $(targets) |
242 | # This is a good hint that there is a bug in the kbuild file |
243 | ifeq ($(KBUILD_VERBOSE),2) |
244 | why = \ |
245 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
246 | $(if $(wildcard $@), \ |
247 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ |
248 | $(if $(arg-check), \ |
249 | $(if $(cmd_$@),- due to command line change, \ |
250 | $(if $(filter $@, $(targets)), \ |
251 | - due to missing .cmd file, \ |
252 | - due to $(notdir $@) not in $$(targets) \ |
253 | ) \ |
254 | ) \ |
255 | ) \ |
256 | ), \ |
257 | - due to target missing \ |
258 | ) \ |
259 | ) |
260 | |
261 | echo-why = $(call escsq, $(strip $(why))) |
262 | endif |
263 |
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Tags:
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v2.6.34-rc5
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v3.9