Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/scripts/Makefile.lib
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File size: 10122 byte(s)
Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File size: 10122 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | # =========================================================================== |
2 | # kbuild: Generic definitions |
3 | # =========================================================================== |
4 | |
5 | # Standard vars |
6 | |
7 | comma := , |
8 | empty := |
9 | space := $(empty) $(empty) |
10 | |
11 | # Backward compatibility - to be removed... |
12 | extra-y += $(EXTRA_TARGETS) |
13 | # Figure out what we need to build from the various variables |
14 | # =========================================================================== |
15 | |
16 | # When an object is listed to be built compiled-in and modular, |
17 | # only build the compiled-in version |
18 | |
19 | obj-m := $(filter-out $(obj-y),$(obj-m)) |
20 | |
21 | # Libraries are always collected in one lib file. |
22 | # Filter out objects already built-in |
23 | |
24 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) |
25 | |
26 | |
27 | # Handle objects in subdirs |
28 | # --------------------------------------------------------------------------- |
29 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o |
30 | # and add the directory to the list of dirs to descend into: $(subdir-y) |
31 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) |
32 | # and add the directory to the list of dirs to descend into: $(subdir-m) |
33 | |
34 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
35 | subdir-y += $(__subdir-y) |
36 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) |
37 | subdir-m += $(__subdir-m) |
38 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) |
39 | obj-m := $(filter-out %/, $(obj-m)) |
40 | |
41 | # Subdirectories we need to descend into |
42 | |
43 | subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
44 | |
45 | # if $(foo-objs) exists, foo.o is a composite object |
46 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
47 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) |
48 | multi-used := $(multi-used-y) $(multi-used-m) |
49 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) |
50 | |
51 | # Build list of the parts of our composite objects, our composite |
52 | # objects depend on those (obviously) |
53 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) |
54 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) |
55 | multi-objs := $(multi-objs-y) $(multi-objs-m) |
56 | |
57 | # $(subdir-obj-y) is the list of objects in $(obj-y) which do not live |
58 | # in the local directory |
59 | subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o))) |
60 | |
61 | # $(obj-dirs) is a list of directories that contain object files |
62 | obj-dirs := $(dir $(multi-objs) $(subdir-obj-y)) |
63 | |
64 | # Replace multi-part objects by their individual parts, look at local dir only |
65 | real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y) |
66 | real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) |
67 | |
68 | # Add subdir path |
69 | |
70 | extra-y := $(addprefix $(obj)/,$(extra-y)) |
71 | always := $(addprefix $(obj)/,$(always)) |
72 | targets := $(addprefix $(obj)/,$(targets)) |
73 | obj-y := $(addprefix $(obj)/,$(obj-y)) |
74 | obj-m := $(addprefix $(obj)/,$(obj-m)) |
75 | lib-y := $(addprefix $(obj)/,$(lib-y)) |
76 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) |
77 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) |
78 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) |
79 | single-used-m := $(addprefix $(obj)/,$(single-used-m)) |
80 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) |
81 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) |
82 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) |
83 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) |
84 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) |
85 | obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) |
86 | |
87 | # The temporary file to save gcc -MD generated dependencies must not |
88 | # contain a comma |
89 | depfile = $(subst $(comma),_,$(@D)/.$(@F).d) |
90 | |
91 | # These flags are needed for modversions and compiling, so we define them here |
92 | # already |
93 | # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will |
94 | # end up in (or would, if it gets compiled in) |
95 | # Note: It's possible that one object gets potentially linked into more |
96 | # than one module. In that case KBUILD_MODNAME will be set to foo_bar, |
97 | # where foo and bar are the name of the modules. |
98 | basename_flags = -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) |
99 | modname_flags = $(if $(filter 1,$(words $(modname))),-DKBUILD_MODNAME=$(subst $(comma),_,$(subst -,_,$(modname)))) |
100 | |
101 | _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o) |
102 | _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o) |
103 | _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F)) |
104 | |
105 | # If building the kernel in a separate objtree expand all occurrences |
106 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). |
107 | |
108 | ifeq ($(KBUILD_SRC),) |
109 | __c_flags = $(_c_flags) |
110 | __a_flags = $(_a_flags) |
111 | __cpp_flags = $(_cpp_flags) |
112 | else |
113 | |
114 | # Prefix -I with $(srctree) if it is not an absolute path |
115 | addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1) |
116 | # Find all -I options and call addtree |
117 | flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o))) |
118 | |
119 | # -I$(obj) locates generated .h files |
120 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files |
121 | # and locates generated .h files |
122 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles |
123 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) |
124 | __a_flags = $(call flags,_a_flags) |
125 | __cpp_flags = $(call flags,_cpp_flags) |
126 | endif |
127 | |
128 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
129 | $(__c_flags) $(modkern_cflags) \ |
130 | $(basename_flags) $(modname_flags) |
131 | |
132 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \ |
133 | $(__a_flags) $(modkern_aflags) |
134 | |
135 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags) |
136 | |
137 | ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS) |
138 | |
139 | # Finds the multi-part object the current object will be linked into |
140 | modname-multi = $(sort $(foreach m,$(multi-used),\ |
141 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) |
142 | |
143 | # Shipped files |
144 | # =========================================================================== |
145 | |
146 | quiet_cmd_shipped = SHIPPED $@ |
147 | cmd_shipped = cat $< > $@ |
148 | |
149 | $(obj)/%:: $(src)/%_shipped |
150 | $(call cmd,shipped) |
151 | |
152 | # Commands useful for building a boot image |
153 | # =========================================================================== |
154 | # |
155 | # Use as following: |
156 | # |
157 | # target: source(s) FORCE |
158 | # $(if_changed,ld/objcopy/gzip) |
159 | # |
160 | # and add target to EXTRA_TARGETS so that we know we have to |
161 | # read in the saved command line |
162 | |
163 | # Linking |
164 | # --------------------------------------------------------------------------- |
165 | |
166 | quiet_cmd_ld = LD $@ |
167 | cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \ |
168 | $(filter-out FORCE,$^) -o $@ |
169 | |
170 | # Objcopy |
171 | # --------------------------------------------------------------------------- |
172 | |
173 | quiet_cmd_objcopy = OBJCOPY $@ |
174 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ |
175 | |
176 | # Gzip |
177 | # --------------------------------------------------------------------------- |
178 | |
179 | quiet_cmd_gzip = GZIP $@ |
180 | cmd_gzip = gzip -f -9 < $< > $@ |
181 | |
182 | # =========================================================================== |
183 | # Generic stuff |
184 | # =========================================================================== |
185 | |
186 | ifneq ($(KBUILD_NOCMDDEP),1) |
187 | # Check if both arguments has same arguments. Result in empty string if equal |
188 | # User may override this check using make KBUILD_NOCMDDEP=1 |
189 | arg-check = $(strip $(filter-out $(1), $(2)) $(filter-out $(2), $(1)) ) |
190 | |
191 | endif |
192 | |
193 | # echo command. Short version is $(quiet) equals quiet, otherwise full command |
194 | echo-cmd = $(if $($(quiet)cmd_$(1)), \ |
195 | echo ' $(subst ','\'',$($(quiet)cmd_$(1)))';) |
196 | |
197 | # function to only execute the passed command if necessary |
198 | # >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file |
199 | # note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars |
200 | # |
201 | if_changed = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ |
202 | @set -e; \ |
203 | $(echo-cmd) \ |
204 | $(cmd_$(1)); \ |
205 | echo 'cmd_$@ := $(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).cmd) |
206 | |
207 | |
208 | # execute the command and also postprocess generated .d dependencies |
209 | # file |
210 | |
211 | if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\ |
212 | $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \ |
213 | @set -e; \ |
214 | $(echo-cmd) \ |
215 | $(cmd_$(1)); \ |
216 | scripts/basic/fixdep $(depfile) $@ '$(subst $$,$$$$,$(subst ','\'',$(cmd_$(1))))' > $(@D)/.$(@F).tmp; \ |
217 | rm -f $(depfile); \ |
218 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd) |
219 | |
220 | # Usage: $(call if_changed_rule,foo) |
221 | # will check if $(cmd_foo) changed, or any of the prequisites changed, |
222 | # and if so will execute $(rule_foo) |
223 | |
224 | if_changed_rule = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\ |
225 | @set -e; \ |
226 | $(rule_$(1))) |
227 | |
228 | # If quiet is set, only print short version of command |
229 | |
230 | cmd = @$(if $($(quiet)cmd_$(1)),echo ' $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1)) |
231 | |
232 | # $(call descend,<dir>,<target>) |
233 | # Recursively call a sub-make in <dir> with target <target> |
234 | # Usage is deprecated, because make do not see this as an invocation of make. |
235 | descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2) |
236 | |
237 | # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj= |
238 | # Usage: |
239 | # $(Q)$(MAKE) $(build)=dir |
240 | build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj |
241 | |
242 | # filechk is used to check if the content of a generated file is updated. |
243 | # Sample usage: |
244 | # define filechk_sample |
245 | # echo $KERNELRELEASE |
246 | # endef |
247 | # version.h : Makefile |
248 | # $(call filechk,sample) |
249 | # The rule defined shall write to stdout the content of the new file. |
250 | # The existing file will be compared with the new one. |
251 | # - If no file exist it is created |
252 | # - If the content differ the new file is used |
253 | # - If they are equal no change, and no timestamp update |
254 | |
255 | define filechk |
256 | $(Q)set -e; \ |
257 | echo ' CHK $@'; \ |
258 | mkdir -p $(dir $@); \ |
259 | $(filechk_$(1)) $(2) > $@.tmp; \ |
260 | if [ -r $@ ] && cmp -s $@ $@.tmp; then \ |
261 | rm -f $@.tmp; \ |
262 | else \ |
263 | echo ' UPD $@'; \ |
264 | mv -f $@.tmp $@; \ |
265 | fi |
266 | endef |
267 |