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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 | ||
10 | ### | |
11 | # The temporary file to save gcc -MD generated dependencies must not | |
12 | # contain a comma | |
13 | depfile = $(subst $(comma),_,$(@D)/.$(@F).d) | |
14 | ||
5e8d780d SR |
15 | ### |
16 | # filename of target with directory and extension stripped | |
17 | basetarget = $(basename $(notdir $@)) | |
18 | ||
d51bfb78 SR |
19 | ### |
20 | # Escape single quote for use in echo statements | |
21 | escsq = $(subst $(squote),'\$(squote)',$1) | |
22 | ||
8ec4b4ff SR |
23 | ### |
24 | # filechk is used to check if the content of a generated file is updated. | |
25 | # Sample usage: | |
26 | # define filechk_sample | |
27 | # echo $KERNELRELEASE | |
28 | # endef | |
29 | # version.h : Makefile | |
30 | # $(call filechk,sample) | |
31 | # The rule defined shall write to stdout the content of the new file. | |
32 | # The existing file will be compared with the new one. | |
33 | # - If no file exist it is created | |
34 | # - If the content differ the new file is used | |
35 | # - If they are equal no change, and no timestamp update | |
36 | # - stdin is piped in from the first prerequisite ($<) so one has | |
37 | # to specify a valid file as first prerequisite (often the kbuild file) | |
38 | define filechk | |
39 | $(Q)set -e; \ | |
40 | echo ' CHK $@'; \ | |
41 | mkdir -p $(dir $@); \ | |
42 | $(filechk_$(1)) < $< > $@.tmp; \ | |
43 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ | |
44 | rm -f $@.tmp; \ | |
45 | else \ | |
46 | echo ' UPD $@'; \ | |
47 | mv -f $@.tmp $@; \ | |
48 | fi | |
49 | endef | |
50 | ||
20a468b5 | 51 | ###### |
9d6e7a70 | 52 | # gcc support functions |
20a468b5 SR |
53 | # See documentation in Documentation/kbuild/makefiles.txt |
54 | ||
55 | # as-option | |
56 | # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,) | |
57 | ||
58 | as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \ | |
59 | -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \ | |
60 | else echo "$(2)"; fi ;) | |
61 | ||
62 | # cc-option | |
63 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586) | |
64 | ||
65 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
66 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) | |
67 | ||
68 | # cc-option-yn | |
69 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6) | |
70 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | |
71 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;) | |
72 | ||
73 | # cc-option-align | |
74 | # Prefix align with either -falign or -malign | |
75 | cc-option-align = $(subst -functions=0,,\ | |
76 | $(call cc-option,-falign-functions=0,-malign-functions=0)) | |
77 | ||
78 | # cc-version | |
79 | # Usage gcc-ver := $(call cc-version, $(CC)) | |
80 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \ | |
81 | $(if $(1), $(1), $(CC))) | |
82 | ||
83 | # cc-ifversion | |
84 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | |
85 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \ | |
86 | echo $(3); fi;) | |
87 | ||
8ec4b4ff SR |
88 | ### |
89 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | |
90 | # Usage: | |
91 | # $(Q)$(MAKE) $(build)=dir | |
92 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | |
93 | ||
d9df92e2 SR |
94 | # Prefix -I with $(srctree) if it is not an absolute path |
95 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | |
96 | # Find all -I options and call addtree | |
97 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) | |
98 | ||
8ec4b4ff | 99 | # If quiet is set, only print short version of command |
6176aa9a | 100 | cmd = @$(echo-cmd) $(cmd_$(1)) |
8ec4b4ff | 101 | |
0a504f25 SR |
102 | # Add $(obj)/ for paths that is not absolute |
103 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) | |
104 | ||
8ec4b4ff SR |
105 | ### |
106 | # if_changed - execute command if any prerequisite is newer than | |
107 | # target, or command line has changed | |
108 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | |
109 | # including used config symbols | |
110 | # if_changed_rule - as if_changed but execute rule instead | |
111 | # See Documentation/kbuild/makefiles.txt for more info | |
112 | ||
113 | ifneq ($(KBUILD_NOCMDDEP),1) | |
114 | # Check if both arguments has same arguments. Result in empty string if equal | |
115 | # User may override this check using make KBUILD_NOCMDDEP=1 | |
116 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) ) | |
117 | endif | |
118 | ||
119 | # echo command. Short version is $(quiet) equals quiet, otherwise full command | |
120 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ | |
d51bfb78 | 121 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';) |
8ec4b4ff | 122 | |
6176aa9a JB |
123 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
124 | ||
8ec4b4ff SR |
125 | # function to only execute the passed command if necessary |
126 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file | |
127 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars | |
4f193362 PS |
128 | # |
129 | if_changed = $(if $(strip $(filter-out $(PHONY),$?) \ | |
130 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ | |
8ec4b4ff | 131 | @set -e; \ |
6176aa9a JB |
132 | $(echo-cmd) $(cmd_$(1)); \ |
133 | echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd) | |
8ec4b4ff SR |
134 | |
135 | # execute the command and also postprocess generated .d dependencies | |
136 | # file | |
4f193362 PS |
137 | if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \ |
138 | $(filter-out FORCE $(wildcard $^),$^) \ | |
139 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ | |
8ec4b4ff | 140 | @set -e; \ |
6176aa9a JB |
141 | $(echo-cmd) $(cmd_$(1)); \ |
142 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \ | |
8ec4b4ff SR |
143 | rm -f $(depfile); \ |
144 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd) | |
145 | ||
146 | # Usage: $(call if_changed_rule,foo) | |
147 | # will check if $(cmd_foo) changed, or any of the prequisites changed, | |
148 | # and if so will execute $(rule_foo) | |
4f193362 PS |
149 | if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \ |
150 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\ | |
8ec4b4ff SR |
151 | @set -e; \ |
152 | $(rule_$(1))) |