Contents of /tags/mkinitrd-6_3_0/busybox/scripts/Kbuild.include
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Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File size: 5451 byte(s)
Thu Aug 19 10:14:02 2010 UTC (14 years, 1 month ago) by niro
File size: 5451 byte(s)
tagged 'mkinitrd-6_3_0'
1 | #### |
2 | # kbuild: Generic definitions |
3 | |
4 | # Convinient variables |
5 | comma := , |
6 | squote := ' |
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 | |
15 | ### |
16 | # Escape single quote for use in echo statements |
17 | escsq = $(subst $(squote),'\$(squote)',$1) |
18 | |
19 | ### |
20 | # filechk is used to check if the content of a generated file is updated. |
21 | # Sample usage: |
22 | # define filechk_sample |
23 | # echo $KERNELRELEASE |
24 | # endef |
25 | # version.h : Makefile |
26 | # $(call filechk,sample) |
27 | # The rule defined shall write to stdout the content of the new file. |
28 | # The existing file will be compared with the new one. |
29 | # - If no file exist it is created |
30 | # - If the content differ the new file is used |
31 | # - If they are equal no change, and no timestamp update |
32 | # - stdin is piped in from the first prerequisite ($<) so one has |
33 | # to specify a valid file as first prerequisite (often the kbuild file) |
34 | define filechk |
35 | $(Q)set -e; \ |
36 | echo ' CHK $@'; \ |
37 | mkdir -p $(dir $@); \ |
38 | $(filechk_$(1)) < $< > $@.tmp; \ |
39 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
40 | rm -f $@.tmp; \ |
41 | else \ |
42 | echo ' UPD $@'; \ |
43 | mv -f $@.tmp $@; \ |
44 | fi |
45 | endef |
46 | |
47 | ###### |
48 | # gcc support functions |
49 | # See documentation in Documentation/kbuild/makefiles.txt |
50 | |
51 | # as-option |
52 | # Usage: cflags-y += $(call as-option, -Wa$(comma)-isa=foo,) |
53 | |
54 | as-option = $(shell if $(CC) $(CFLAGS) $(1) -Wa,-Z -c -o /dev/null \ |
55 | -xassembler /dev/null > /dev/null 2>&1; then echo "$(1)"; \ |
56 | else echo "$(2)"; fi ;) |
57 | |
58 | # cc-option |
59 | # Usage: cflags-y += $(call cc-option, -march=winchip-c6, -march=i586) |
60 | |
61 | cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ |
62 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) |
63 | |
64 | # hostcc-option |
65 | # Usage: hostcflags-y += $(call hostcc-option, -march=winchip-c6, -march=i586) |
66 | |
67 | hostcc-option = $(shell if $(HOSTCC) $(HOSTCFLAGS) $(1) -S -o /dev/null -xc /dev/null \ |
68 | > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;) |
69 | |
70 | # cc-option-yn |
71 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6) |
72 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ |
73 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;) |
74 | |
75 | # cc-option-align |
76 | # Prefix align with either -falign or -malign |
77 | cc-option-align = $(subst -functions=0,,\ |
78 | $(call cc-option,-falign-functions=0,-malign-functions=0)) |
79 | |
80 | # cc-version |
81 | # Usage gcc-ver := $(call cc-version, $(CC)) |
82 | cc-version = $(shell PATH="$(PATH)" $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \ |
83 | $(if $(1), $(1), $(CC))) |
84 | |
85 | # cc-ifversion |
86 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) |
87 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \ |
88 | echo $(3); fi;) |
89 | |
90 | ### |
91 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
92 | # Usage: |
93 | # $(Q)$(MAKE) $(build)=dir |
94 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
95 | |
96 | # Prefix -I with $(srctree) if it is not an absolute path |
97 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) |
98 | # Find all -I options and call addtree |
99 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
100 | |
101 | # If quiet is set, only print short version of command |
102 | cmd = @$(echo-cmd) $(cmd_$(1)) |
103 | |
104 | # Add $(obj)/ for paths that is not absolute |
105 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) |
106 | |
107 | ### |
108 | # if_changed - execute command if any prerequisite is newer than |
109 | # target, or command line has changed |
110 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies |
111 | # including used config symbols |
112 | # if_changed_rule - as if_changed but execute rule instead |
113 | # See Documentation/kbuild/makefiles.txt for more info |
114 | |
115 | ifneq ($(KBUILD_NOCMDDEP),1) |
116 | # Check if both arguments has same arguments. Result in empty string if equal |
117 | # User may override this check using make KBUILD_NOCMDDEP=1 |
118 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) ) |
119 | endif |
120 | |
121 | # echo command. Short version is $(quiet) equals quiet, otherwise full command |
122 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ |
123 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';) |
124 | |
125 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) |
126 | |
127 | # function to only execute the passed command if necessary |
128 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file |
129 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars |
130 | # |
131 | if_changed = $(if $(strip $(filter-out $(PHONY),$?) \ |
132 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ |
133 | @set -e; \ |
134 | $(echo-cmd) $(cmd_$(1)); \ |
135 | echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd) |
136 | |
137 | # execute the command and also postprocess generated .d dependencies |
138 | # file |
139 | if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \ |
140 | $(filter-out FORCE $(wildcard $^),$^) \ |
141 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ |
142 | @set -e; \ |
143 | $(echo-cmd) $(cmd_$(1)); \ |
144 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \ |
145 | rm -f $(depfile); \ |
146 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd) |
147 | |
148 | # Usage: $(call if_changed_rule,foo) |
149 | # will check if $(cmd_foo) changed, or any of the prequisites changed, |
150 | # and if so will execute $(rule_foo) |
151 | if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \ |
152 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\ |
153 | @set -e; \ |
154 | $(rule_$(1))) |