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