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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 | ||
66 | # cc-option | |
67 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586) | |
68 | ||
69 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
70 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) | |
71 | ||
72 | # cc-option-yn | |
73 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6) | |
74 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
75 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;) | |
76 | ||
77 | # cc-option-align | |
78 | # Prefix align with either -falign or -malign | |
79 | cc-option-align = $(subst -functions=0,,\ | |
80 | $(call cc-option,-falign-functions=0,-malign-functions=0)) | |
81 | ||
82 | # cc-version | |
83 | # Usage gcc-ver := $(call cc-version, $(CC)) | |
8eb3afe0 | 84 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC)) |
20a468b5 SR |
85 | |
86 | # cc-ifversion | |
87 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
88 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \ | |
89 | echo $(3); fi;) | |
90 | ||
0b0bf7a3 RM |
91 | # ld-option |
92 | # Usage: ldflags += $(call ld-option, -Wl$(comma)--hash-style=both) | |
93 | ld-option = $(shell if $(CC) $(1) \ | |
94 | -nostdlib -o ldtest$$$$.out -xc /dev/null \ | |
95 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi; \ | |
96 | rm -f ldtest$$$$.out) | |
97 | ||
8ec4b4ff SR |
98 | ### |
99 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | |
100 | # Usage: | |
101 | # $(Q)$(MAKE) $(build)=dir | |
102 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
103 | ||
d9df92e2 SR |
104 | # Prefix -I with $(srctree) if it is not an absolute path |
105 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | |
106 | # Find all -I options and call addtree | |
107 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) | |
108 | ||
8ec4b4ff | 109 | # If quiet is set, only print short version of command |
6176aa9a | 110 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 111 | |
0a504f25 SR |
112 | # Add $(obj)/ for paths that is not absolute |
113 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) | |
114 | ||
8ec4b4ff SR |
115 | ### |
116 | # if_changed - execute command if any prerequisite is newer than | |
117 | # target, or command line has changed | |
118 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
119 | # including used config symbols | |
120 | # if_changed_rule - as if_changed but execute rule instead | |
121 | # See Documentation/kbuild/makefiles.txt for more info | |
122 | ||
123 | ifneq ($(KBUILD_NOCMDDEP),1) | |
124 | # Check if both arguments has same arguments. Result in empty string if equal | |
125 | # User may override this check using make KBUILD_NOCMDDEP=1 | |
48f1f058 SR |
126 | arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \ |
127 | $(filter-out $(cmd_$@), $(cmd_$(1))) ) | |
8ec4b4ff SR |
128 | endif |
129 | ||
130 | # echo command. Short version is $(quiet) equals quiet, otherwise full command | |
131 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ | |
d51bfb78 | 132 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';) |
8ec4b4ff | 133 | |
48f1f058 SR |
134 | # >'< substitution is for echo to work, |
135 | # >$< substitution to preserve $ when reloading .cmd file | |
136 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] | |
137 | # in $(cmd_xxx) double $$ your perl vars | |
6176aa9a JB |
138 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
139 | ||
48f1f058 SR |
140 | # Find any prerequisites that is newer than target or that does not exist. |
141 | # PHONY targets skipped in both cases. | |
142 | any-prereq = $(filter-out $(PHONY),$?) $(filter-out $(PHONY) $(wildcard $^),$^) | |
143 | ||
144 | # Execute command if command has changed or prerequisitei(s) are updated | |
4f193362 | 145 | # |
48f1f058 SR |
146 | if_changed = $(if $(strip $(any-prereq) $(arg-check)), \ |
147 | @set -e; \ | |
148 | $(echo-cmd) $(cmd_$(1)); \ | |
149 | echo 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd) | |
8ec4b4ff SR |
150 | |
151 | # execute the command and also postprocess generated .d dependencies | |
152 | # file | |
48f1f058 SR |
153 | if_changed_dep = $(if $(strip $(any-prereq) $(arg-check) ), \ |
154 | @set -e; \ | |
155 | $(echo-cmd) $(cmd_$(1)); \ | |
156 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).tmp;\ | |
157 | rm -f $(depfile); \ | |
158 | mv -f $(dot-target).tmp $(dot-target).cmd) | |
8ec4b4ff SR |
159 | |
160 | # Usage: $(call if_changed_rule,foo) | |
161 | # will check if $(cmd_foo) changed, or any of the prequisites changed, | |
162 | # and if so will execute $(rule_foo) | |
48f1f058 SR |
163 | if_changed_rule = $(if $(strip $(any-prereq) $(arg-check) ), \ |
164 | @set -e; \ | |
165 | $(rule_$(1))) | |
166 |