Commit | Line | Data |
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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 | ||
910b4046 SR |
59 | # cc-cross-prefix |
60 | # Usage: CROSS_COMPILE := $(call cc-cross-prefix, m68k-linux-gnu- m68k-linux-) | |
61 | # Return first prefix where a prefix$(CC) is found in PATH. | |
62 | # If no $(CC) found in PATH with listed prefixes return nothing | |
63 | cc-cross-prefix = \ | |
64 | $(word 1, $(foreach c,$(1), \ | |
65 | $(shell set -e; \ | |
66 | if (which $(strip $(c))$(CC)) > /dev/null 2>&1 ; then \ | |
67 | echo $(c); \ | |
68 | fi))) | |
69 | ||
beda9f3a RZ |
70 | # output directory for tests below |
71 | TMPOUT := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/) | |
72 | ||
73 | # try-run | |
74 | # Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) | |
75 | # Exit code chooses option. "$$TMP" is can be used as temporary file and | |
76 | # is automatically cleaned up. | |
77 | try-run = $(shell set -e; \ | |
78 | TMP="$(TMPOUT).$$$$.tmp"; \ | |
79 | if ($(1)) >/dev/null 2>&1; \ | |
80 | then echo "$(2)"; \ | |
81 | else echo "$(3)"; \ | |
82 | fi; \ | |
83 | rm -f "$$TMP") | |
347a00fb | 84 | |
20a468b5 | 85 | # as-option |
bff288c1 | 86 | # Usage: cflags-y += $(call as-option,-Wa$(comma)-isa=foo,) |
beda9f3a RZ |
87 | |
88 | as-option = $(call try-run,\ | |
a0f97e06 | 89 | $(CC) $(KBUILD_CFLAGS) $(1) -c -xassembler /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 | 90 | |
e2414910 | 91 | # as-instr |
bff288c1 | 92 | # Usage: cflags-y += $(call as-instr,instr,option1,option2) |
beda9f3a RZ |
93 | |
94 | as-instr = $(call try-run,\ | |
222d394d | 95 | echo -e "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -xassembler -o "$$TMP" -,$(2),$(3)) |
e2414910 | 96 | |
20a468b5 | 97 | # cc-option |
bff288c1 | 98 | # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) |
beda9f3a RZ |
99 | |
100 | cc-option = $(call try-run,\ | |
a0f97e06 | 101 | $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",$(1),$(2)) |
20a468b5 SR |
102 | |
103 | # cc-option-yn | |
bff288c1 | 104 | # Usage: flag := $(call cc-option-yn,-march=winchip-c6) |
beda9f3a | 105 | cc-option-yn = $(call try-run,\ |
a0f97e06 | 106 | $(CC) $(KBUILD_CFLAGS) $(1) -S -xc /dev/null -o "$$TMP",y,n) |
20a468b5 SR |
107 | |
108 | # cc-option-align | |
109 | # Prefix align with either -falign or -malign | |
110 | cc-option-align = $(subst -functions=0,,\ | |
beda9f3a | 111 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
20a468b5 SR |
112 | |
113 | # cc-version | |
0ab2a272 | 114 | # Usage gcc-ver := $(call cc-version) |
8eb3afe0 | 115 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 | 116 | |
0ab2a272 SB |
117 | # cc-fullversion |
118 | # Usage gcc-ver := $(call cc-fullversion) | |
119 | cc-fullversion = $(shell $(CONFIG_SHELL) \ | |
120 | $(srctree)/scripts/gcc-version.sh -p $(CC)) | |
121 | ||
20a468b5 SR |
122 | # cc-ifversion |
123 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
5de043f4 | 124 | cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3)) |
20a468b5 | 125 | |
0b0bf7a3 RM |
126 | # ld-option |
127 | # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) | |
beda9f3a RZ |
128 | ld-option = $(call try-run,\ |
129 | $(CC) $(1) -nostdlib -xc /dev/null -o "$$TMP",$(1),$(2)) | |
5de043f4 OV |
130 | |
131 | ###### | |
0b0bf7a3 | 132 | |
beda9f3a | 133 | ### |
8ec4b4ff SR |
134 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
135 | # Usage: | |
136 | # $(Q)$(MAKE) $(build)=dir | |
137 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
138 | ||
beda9f3a RZ |
139 | # Prefix -I with $(srctree) if it is not an absolute path. |
140 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | |
5de043f4 | 141 | |
d9df92e2 | 142 | # Find all -I options and call addtree |
beda9f3a | 143 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
d9df92e2 | 144 | |
5de043f4 OV |
145 | # echo command. |
146 | # Short version is used, if $(quiet) equals `quiet_', otherwise full one. | |
bff288c1 | 147 | echo-cmd = $(if $($(quiet)cmd_$(1)),\ |
5de043f4 OV |
148 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
149 | ||
150 | # printing commands | |
6176aa9a | 151 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 152 | |
5de043f4 | 153 | # Add $(obj)/ for paths that are not absolute |
bff288c1 | 154 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
0a504f25 | 155 | |
8ec4b4ff | 156 | ### |
5de043f4 | 157 | # if_changed - execute command if any prerequisite is newer than |
8ec4b4ff SR |
158 | # target, or command line has changed |
159 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
160 | # including used config symbols | |
161 | # if_changed_rule - as if_changed but execute rule instead | |
162 | # See Documentation/kbuild/makefiles.txt for more info | |
163 | ||
164 | ifneq ($(KBUILD_NOCMDDEP),1) | |
beda9f3a | 165 | # Check if both arguments has same arguments. Result is empty string if equal. |
8ec4b4ff | 166 | # User may override this check using make KBUILD_NOCMDDEP=1 |
48f1f058 SR |
167 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
168 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
8ec4b4ff SR |
169 | endif |
170 | ||
48f1f058 SR |
171 | # >'< substitution is for echo to work, |
172 | # >$< substitution to preserve $ when reloading .cmd file | |
173 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
174 | # in $(cmd_xxx) double $$ your perl vars | |
6176aa9a JB |
175 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
176 | ||
48f1f058 SR |
177 | # Find any prerequisites that is newer than target or that does not exist. |
178 | # PHONY targets skipped in both cases. | |
179 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
180 | ||
5de043f4 | 181 | # Execute command if command has changed or prerequisite(s) are updated. |
4f193362 | 182 | # |
48f1f058 SR |
183 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
184 | @set -e; \ | |
185 | $(echo-cmd) $(cmd_$(1)); \ | |
186 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff | 187 | |
5de043f4 | 188 | # Execute the command and also postprocess generated .d dependencies file. |
48f1f058 SR |
189 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
190 | @set -e; \ | |
191 | $(echo-cmd) $(cmd_$(1)); \ | |
192 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
193 | rm -f $(depfile); \ | |
194 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
195 | |
196 | # Usage: $(call if_changed_rule,foo) | |
beda9f3a RZ |
197 | # Will check if $(cmd_foo) or any of the prerequisites changed, |
198 | # and if so will execute $(rule_foo). | |
48f1f058 SR |
199 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
200 | @set -e; \ | |
201 | $(rule_$(1))) | |
202 | ||
45d506bd SR |
203 | ### |
204 | # why - tell why a a target got build | |
205 | # enabled by make V=2 | |
206 | # Output (listed in the order they are checked): | |
207 | # (1) - due to target is PHONY | |
208 | # (2) - due to target missing | |
209 | # (3) - due to: file1.h file2.h | |
210 | # (4) - due to command line change | |
211 | # (5) - due to missing .cmd file | |
212 | # (6) - due to target not in $(targets) | |
213 | # (1) PHONY targets are always build | |
214 | # (2) No target, so we better build it | |
215 | # (3) Prerequisite is newer than target | |
216 | # (4) The command line stored in the file named dir/.target.cmd | |
217 | # differed from actual command line. This happens when compiler | |
218 | # options changes | |
219 | # (5) No dir/.target.cmd file (used to store command line) | |
220 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
221 | # This is a good hint that there is a bug in the kbuild file | |
222 | ifeq ($(KBUILD_VERBOSE),2) | |
223 | why = \ | |
224 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
225 | $(if $(wildcard $@), \ | |
226 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
227 | $(if $(arg-check), \ | |
228 | $(if $(cmd_$@),- due to command line change, \ | |
229 | $(if $(filter $@, $(targets)), \ | |
230 | - due to missing .cmd file, \ | |
231 | - due to $(notdir $@) not in $$(targets) \ | |
232 | ) \ | |
233 | ) \ | |
234 | ) \ | |
235 | ), \ | |
236 | - due to target missing \ | |
237 | ) \ | |
238 | ) | |
239 | ||
240 | echo-why = $(call escsq, $(strip $(why))) | |
241 | endif |