Annotation of /tags/mkinitrd-6_2_0/scripts/Kbuild.include
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/scripts/Kbuild.include
File size: 5178 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
Original Path: trunk/mkinitrd-magellan/busybox/scripts/Kbuild.include
File size: 5178 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | #### |
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 | # cc-option-yn | ||
65 | # Usage: flag := $(call cc-option-yn, -march=winchip-c6) | ||
66 | cc-option-yn = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \ | ||
67 | > /dev/null 2>&1; then echo "y"; else echo "n"; fi;) | ||
68 | |||
69 | # cc-option-align | ||
70 | # Prefix align with either -falign or -malign | ||
71 | cc-option-align = $(subst -functions=0,,\ | ||
72 | $(call cc-option,-falign-functions=0,-malign-functions=0)) | ||
73 | |||
74 | # cc-version | ||
75 | # Usage gcc-ver := $(call cc-version, $(CC)) | ||
76 | cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh \ | ||
77 | $(if $(1), $(1), $(CC))) | ||
78 | |||
79 | # cc-ifversion | ||
80 | # Usage: EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1) | ||
81 | cc-ifversion = $(shell if [ $(call cc-version, $(CC)) $(1) $(2) ]; then \ | ||
82 | echo $(3); fi;) | ||
83 | |||
84 | ### | ||
85 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= | ||
86 | # Usage: | ||
87 | # $(Q)$(MAKE) $(build)=dir | ||
88 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj | ||
89 | |||
90 | # Prefix -I with $(srctree) if it is not an absolute path | ||
91 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) | ||
92 | # Find all -I options and call addtree | ||
93 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) | ||
94 | |||
95 | # If quiet is set, only print short version of command | ||
96 | cmd = @$(echo-cmd) $(cmd_$(1)) | ||
97 | |||
98 | # Add $(obj)/ for paths that is not absolute | ||
99 | objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o))) | ||
100 | |||
101 | ### | ||
102 | # if_changed - execute command if any prerequisite is newer than | ||
103 | # target, or command line has changed | ||
104 | # if_changed_dep - as if_changed, but uses fixdep to reveal dependencies | ||
105 | # including used config symbols | ||
106 | # if_changed_rule - as if_changed but execute rule instead | ||
107 | # See Documentation/kbuild/makefiles.txt for more info | ||
108 | |||
109 | ifneq ($(KBUILD_NOCMDDEP),1) | ||
110 | # Check if both arguments has same arguments. Result in empty string if equal | ||
111 | # User may override this check using make KBUILD_NOCMDDEP=1 | ||
112 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) ) | ||
113 | endif | ||
114 | |||
115 | # echo command. Short version is $(quiet) equals quiet, otherwise full command | ||
116 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ | ||
117 | echo ' $(call escsq,$($(quiet)cmd_$(1)))';) | ||
118 | |||
119 | make-cmd = $(subst \#,\\\#,$(subst $$,$$$$,$(call escsq,$(cmd_$(1))))) | ||
120 | |||
121 | # function to only execute the passed command if necessary | ||
122 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file | ||
123 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars | ||
124 | # | ||
125 | if_changed = $(if $(strip $(filter-out $(PHONY),$?) \ | ||
126 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ | ||
127 | @set -e; \ | ||
128 | $(echo-cmd) $(cmd_$(1)); \ | ||
129 | echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd) | ||
130 | |||
131 | # execute the command and also postprocess generated .d dependencies | ||
132 | # file | ||
133 | if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \ | ||
134 | $(filter-out FORCE $(wildcard $^),$^) \ | ||
135 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ | ||
136 | @set -e; \ | ||
137 | $(echo-cmd) $(cmd_$(1)); \ | ||
138 | scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \ | ||
139 | rm -f $(depfile); \ | ||
140 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd) | ||
141 | |||
142 | # Usage: $(call if_changed_rule,foo) | ||
143 | # will check if $(cmd_foo) changed, or any of the prequisites changed, | ||
144 | # and if so will execute $(rule_foo) | ||
145 | if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \ | ||
146 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\ | ||
147 | @set -e; \ | ||
148 | $(rule_$(1))) |