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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 |