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8ec4b4ff SR |
1 | #### |
2 | # kbuild: Generic definitions | |
3 | ||
4 | # Convinient variables | |
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 | ||
59 | # as-option | |
60 | # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,) | |
61 | ||
62 | as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \ | |
63 | -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \ | |
64 | else echo "$(2)"; fi ;) | |
65 | ||
e2414910 AK |
66 | # as-instr |
67 | # Usage: cflags-y += $(call as-instr, instr, option1, option2) | |
68 | ||
adf14236 JB |
69 | as-instr = $(shell if echo -e "$(1)" | $(AS) >/dev/null 2>&1 -W -Z -o astest$$$$.out ; \ |
70 | then echo "$(2)"; else echo "$(3)"; fi; \ | |
e2414910 AK |
71 | rm -f astest$$$$.out) |
72 | ||
20a468b5 SR |
73 | # cc-option |
74 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586) | |
75 | ||
76 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
77 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) | |
78 | ||
79 | # cc-option-yn | |
80 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6) | |
81 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
82 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;) | |
83 | ||
84 | # cc-option-align | |
85 | # Prefix align with either -falign or -malign | |
86 | cc-option-align = $(subst -functions=0,,\ | |
87 | $(call cc-option,-falign-functions=0,-malign-functions=0)) | |
88 | ||
89 | # cc-version | |
90 | # Usage gcc-ver := $(call cc-version, $(CC)) | |
8eb3afe0 | 91 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 SR |
92 | |
93 | # cc-ifversion | |
94 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
95 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \ | |
96 | echo $(3); fi;) | |
97 | ||
0b0bf7a3 RM |
98 | # ld-option |
99 | # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) | |
100 | ld-option = $(shell if $(CC) $(1) \ | |
101 | -nostdlib -o ldtest$$$$.out -xc /dev/null \ | |
102 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \ | |
103 | rm -f ldtest$$$$.out) | |
104 | ||
8ec4b4ff SR |
105 | ### |
106 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | |
107 | # Usage: | |
108 | # $(Q)$(MAKE) $(build)=dir | |
109 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
110 | ||
d9df92e2 SR |
111 | # Prefix -I with $(srctree) if it is not an absolute path |
112 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | |
113 | # Find all -I options and call addtree | |
114 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) | |
115 | ||
8ec4b4ff | 116 | # If quiet is set, only print short version of command |
6176aa9a | 117 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 118 | |
0a504f25 SR |
119 | # Add $(obj)/ for paths that is not absolute |
120 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) | |
121 | ||
8ec4b4ff SR |
122 | ### |
123 | # if_changed - execute command if any prerequisite is newer than | |
124 | # target, or command line has changed | |
125 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
126 | # including used config symbols | |
127 | # if_changed_rule - as if_changed but execute rule instead | |
128 | # See Documentation/kbuild/makefiles.txt for more info | |
129 | ||
130 | ifneq ($(KBUILD_NOCMDDEP),1) | |
131 | # Check if both arguments has same arguments. Result in empty string if equal | |
132 | # User may override this check using make KBUILD_NOCMDDEP=1 | |
48f1f058 SR |
133 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
134 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
8ec4b4ff SR |
135 | endif |
136 | ||
137 | # echo command. Short version is $(quiet) equals quiet, otherwise full command | |
138 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ | |
45d506bd | 139 | echo ' $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';) |
8ec4b4ff | 140 | |
48f1f058 SR |
141 | # >'< substitution is for echo to work, |
142 | # >$< substitution to preserve $ when reloading .cmd file | |
143 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
144 | # in $(cmd_xxx) double $$ your perl vars | |
6176aa9a JB |
145 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
146 | ||
48f1f058 SR |
147 | # Find any prerequisites that is newer than target or that does not exist. |
148 | # PHONY targets skipped in both cases. | |
149 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
150 | ||
151 | # Execute command if command has changed or prerequisitei(s) are updated | |
4f193362 | 152 | # |
48f1f058 SR |
153 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
154 | @set -e; \ | |
155 | $(echo-cmd) $(cmd_$(1)); \ | |
156 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff SR |
157 | |
158 | # execute the command and also postprocess generated .d dependencies | |
159 | # file | |
48f1f058 SR |
160 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
161 | @set -e; \ | |
162 | $(echo-cmd) $(cmd_$(1)); \ | |
163 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
164 | rm -f $(depfile); \ | |
165 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
166 | |
167 | # Usage: $(call if_changed_rule,foo) | |
168 | # will check if $(cmd_foo) changed, or any of the prequisites changed, | |
169 | # and if so will execute $(rule_foo) | |
48f1f058 SR |
170 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
171 | @set -e; \ | |
172 | $(rule_$(1))) | |
173 | ||
45d506bd SR |
174 | ### |
175 | # why - tell why a a target got build | |
176 | # enabled by make V=2 | |
177 | # Output (listed in the order they are checked): | |
178 | # (1) - due to target is PHONY | |
179 | # (2) - due to target missing | |
180 | # (3) - due to: file1.h file2.h | |
181 | # (4) - due to command line change | |
182 | # (5) - due to missing .cmd file | |
183 | # (6) - due to target not in $(targets) | |
184 | # (1) PHONY targets are always build | |
185 | # (2) No target, so we better build it | |
186 | # (3) Prerequisite is newer than target | |
187 | # (4) The command line stored in the file named dir/.target.cmd | |
188 | # differed from actual command line. This happens when compiler | |
189 | # options changes | |
190 | # (5) No dir/.target.cmd file (used to store command line) | |
191 | # (6) No dir/.target.cmd file and target not listed in $(targets) | |
192 | # This is a good hint that there is a bug in the kbuild file | |
193 | ifeq ($(KBUILD_VERBOSE),2) | |
194 | why = \ | |
195 | $(if $(filter $@, $(PHONY)),- due to target is PHONY, \ | |
196 | $(if $(wildcard $@), \ | |
197 | $(if $(strip $(any-prereq)),- due to: $(any-prereq), \ | |
198 | $(if $(arg-check), \ | |
199 | $(if $(cmd_$@),- due to command line change, \ | |
200 | $(if $(filter $@, $(targets)), \ | |
201 | - due to missing .cmd file, \ | |
202 | - due to $(notdir $@) not in $$(targets) \ | |
203 | ) \ | |
204 | ) \ | |
205 | ) \ | |
206 | ), \ | |
207 | - due to target missing \ | |
208 | ) \ | |
209 | ) | |
210 | ||
211 | echo-why = $(call escsq, $(strip $(why))) | |
212 | endif |