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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 | # filename of first prerequisite with directory and extension stripped |
25 | baseprereq = $(basename $(notdir $<)) |
26 | |
27 | ### |
28 | # Escape single quote for use in echo statements |
29 | escsq = $(subst $(squote),'\$(squote)',$1) |
30 | |
31 | ### |
32 | # Easy method for doing a status message |
33 | kecho := : |
34 | quiet_kecho := echo |
35 | silent_kecho := : |
36 | kecho := $($(quiet)kecho) |
37 | |
38 | ### |
39 | # filechk is used to check if the content of a generated file is updated. |
40 | # Sample usage: |
41 | # define filechk_sample |
42 | # echo $KERNELRELEASE |
43 | # endef |
44 | # version.h : Makefile |
45 | # $(call filechk,sample) |
46 | # The rule defined shall write to stdout the content of the new file. |
47 | # The existing file will be compared with the new one. |
48 | # - If no file exist it is created |
49 | # - If the content differ the new file is used |
50 | # - If they are equal no change, and no timestamp update |
51 | # - stdin is piped in from the first prerequisite ($<) so one has |
52 | # to specify a valid file as first prerequisite (often the kbuild file) |
53 | define filechk |
54 | $(Q)set -e; \ |
55 | $(kecho) ' CHK $@'; \ |
56 | mkdir -p $(dir $@); \ |
57 | $(filechk_$(1)) < $< > $@.tmp; \ |
58 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
59 | rm -f $@.tmp; \ |
60 | else \ |
61 | $(kecho) ' UPD $@'; \ |
62 | mv -f $@.tmp $@; \ |
63 | fi |
64 | endef |
65 | |
66 | ###### |
67 | # gcc support functions |
68 | # See documentation in Documentation/kbuild/makefiles.txt |
69 | |
70 | # cc-cross-prefix |
71 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) |
72 | # Return first prefix where a prefix$(CC) is found in PATH. |
73 | # If no $(CC) found in PATH with listed prefixes return nothing |
74 | cc-cross-prefix = \ |
75 | $(word 1, $(foreach c,$(1), \ |
76 | $(shell set -e; \ |
77 | if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ |
78 | echo $(c); \ |
79 | fi))) |
80 | |
81 | # output directory for tests below |
82 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) |
83 | |
84 | # try-run |
85 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) |
86 | # Exit code chooses option. "$$TMP" is can be used as temporary file and |
87 | # is automatically cleaned up. |
88 | try-run = $(shell set -e; \ |
89 | TMP="$(TMPOUT).$$$$.tmp"; \ |
90 | TMPO="$(TMPOUT).$$$$.o"; \ |
91 | if ($(1)) >/dev/null 2>&1; \ |
92 | then echo "$(2)"; \ |
93 | else echo "$(3)"; \ |
94 | fi; \ |
95 | rm -f "$$TMP" "$$TMPO") |
96 | |
97 | # as-option |
98 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
99 | |
100 | as-option = $(call try-run,\ |
101 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
102 | |
103 | # as-instr |
104 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
105 | |
106 | as-instr = $(call try-run,\ |
107 | /bin/echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
108 | |
109 | # cc-option |
110 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
111 | |
112 | cc-option = $(call try-run,\ |
113 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",$(1),$(2)) |
114 | |
115 | # cc-option-yn |
116 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
117 | cc-option-yn = $(call try-run,\ |
118 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n) |
119 | |
120 | # cc-option-align |
121 | # Prefix align with either -falign or -malign |
122 | cc-option-align = $(subst -functions=0,,\ |
123 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
124 | |
125 | # cc-disable-warning |
126 | # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) |
127 | cc-disable-warning = $(call try-run,\ |
128 | $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -xc /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
129 | |
130 | # cc-version |
131 | # Usage gcc-ver := $(call cc-version) |
132 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
133 | |
134 | # cc-fullversion |
135 | # Usage gcc-ver := $(call cc-fullversion) |
136 | cc-fullversion = $(shell $(CONFIG_SHELL) \ |
137 | $(srctree)/scripts/gcc-version.sh -p $(CC)) |
138 | |
139 | # cc-ifversion |
140 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
141 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
142 | |
143 | # cc-ldoption |
144 | # Usage: ldflags += $(call cc-ldoption, -Wl$(comma)--hash-style=both) |
145 | cc-ldoption = $(call try-run,\ |
146 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) |
147 | |
148 | # ld-option |
149 | # Usage: LDFLAGS += $(call ld-option, -X) |
150 | ld-option = $(call try-run,\ |
151 | $(CC) /dev/null -c -o "$$TMPO" ; $(LD) $(1) "$$TMPO" -o "$$TMP",$(1),$(2)) |
152 | |
153 | # ar-option |
154 | # Usage: KBUILD_ARFLAGS := $(call ar-option,D) |
155 | # Important: no spaces around options |
156 | ar-option = $(call try-run, $(AR) rc$(1) "$$TMP",$(1),$(2)) |
157 | |
158 | ###### |
159 | |
160 | ### |
161 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
162 | # Usage: |
163 | # $(Q)$(MAKE) $(build)=dir |
164 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
165 | |
166 | ### |
167 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj= |
168 | # Usage: |
169 | # $(Q)$(MAKE) $(modbuiltin)=dir |
170 | modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj |
171 | |
172 | # Prefix -I with $(srctree) if it is not an absolute path. |
173 | # skip if -I has no parameter |
174 | addtree = $(if $(patsubst -I%,%,$(1)), \ |
175 | $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)) |
176 | |
177 | # Find all -I options and call addtree |
178 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
179 | |
180 | # echo command. |
181 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. |
182 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
183 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
184 | |
185 | # printing commands |
186 | cmd = @$(echo-cmd) $(cmd_$(1)) |
187 | |
188 | # Add $(obj)/ for paths that are not absolute |
189 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
190 | |
191 | ### |
192 | # if_changed - execute command if any prerequisite is newer than |
193 | # target, or command line has changed |
194 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
195 | # including used config symbols |
196 | # if_changed_rule - as if_changed but execute rule instead |
197 | # See Documentation/kbuild/makefiles.txt for more info |
198 | |
199 | ifneq ($(KBUILD_NOCMDDEP),1) |
200 | # Check if both arguments has same arguments. Result is empty string if equal. |
201 | # User may override this check using make KBUILD_NOCMDDEP=1 |
202 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
203 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) |
204 | else |
205 | arg-check = $(if $(strip $(cmd_$@)),,1) |
206 | endif |
207 | |
208 | # >'< substitution is for echo to work, |
209 | # >$< substitution to preserve $ when reloading .cmd file |
210 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] |
211 | # in $(cmd_xxx) double $$ your perl vars |
212 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
213 | |
214 | # Find any prerequisites that is newer than target or that does not exist. |
215 | # PHONY targets skipped in both cases. |
216 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) |
217 | |
218 | # Execute command if command has changed or prerequisite(s) are updated. |
219 | # |
220 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
221 | @set -e; \ |
222 | $(echo-cmd) $(cmd_$(1)); \ |
223 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) |
224 | |
225 | # Execute the command and also postprocess generated .d dependencies file. |
226 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
227 | @set -e; \ |
228 | $(echo-cmd) $(cmd_$(1)); \ |
229 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ |
230 | rm -f $(depfile); \ |
231 | mv -f $(dot-target).tmp $(dot-target).cmd) |
232 | |
233 | # Usage: $(call if_changed_rule,foo) |
234 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
235 | # and if so will execute $(rule_foo). |
236 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
237 | @set -e; \ |
238 | $(rule_$(1))) |
239 | |
240 | ### |
241 | # why - tell why a a target got build |
242 | # enabled by make V=2 |
243 | # Output (listed in the order they are checked): |
244 | # (1) - due to target is PHONY |
245 | # (2) - due to target missing |
246 | # (3) - due to: file1.h file2.h |
247 | # (4) - due to command line change |
248 | # (5) - due to missing .cmd file |
249 | # (6) - due to target not in $(targets) |
250 | # (1) PHONY targets are always build |
251 | # (2) No target, so we better build it |
252 | # (3) Prerequisite is newer than target |
253 | # (4) The command line stored in the file named dir/.target.cmd |
254 | # differed from actual command line. This happens when compiler |
255 | # options changes |
256 | # (5) No dir/.target.cmd file (used to store command line) |
257 | # (6) No dir/.target.cmd file and target not listed in $(targets) |
258 | # This is a good hint that there is a bug in the kbuild file |
259 | ifeq ($(KBUILD_VERBOSE),2) |
260 | why = \ |
261 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ |
262 | $(if $(wildcard $@), \ |
263 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ |
264 | $(if $(arg-check), \ |
265 | $(if $(cmd_$@),- due to command line change, \ |
266 | $(if $(filter $@, $(targets)), \ |
267 | - due to missing .cmd file, \ |
268 | - due to $(notdir $@) not in $$(targets) \ |
269 | ) \ |
270 | ) \ |
271 | ) \ |
272 | ), \ |
273 | - due to target missing \ |
274 | ) \ |
275 | ) |
276 | |
277 | echo-why = $(call escsq, $(strip $(why))) |
278 | endif |
279 |
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