1 # Backward compatibility
2 asflags-y += $(EXTRA_AFLAGS)
3 ccflags-y += $(EXTRA_CFLAGS)
4 cppflags-y += $(EXTRA_CPPFLAGS)
5 ldflags-y += $(EXTRA_LDFLAGS)
8 # flags that take effect in sub directories
9 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
12 # Figure out what we need to build from the various variables
13 # ===========================================================================
15 # When an object is listed to be built compiled-in and modular,
16 # only build the compiled-in version
18 obj-m := $(filter-out $(obj-y),$(obj-m))
20 # Libraries are always collected in one lib file.
21 # Filter out objects already built-in
23 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
26 # Handle objects in subdirs
27 # ---------------------------------------------------------------------------
28 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
29 # and add the directory to the list of dirs to descend into: $(subdir-y)
30 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
31 # and add the directory to the list of dirs to descend into: $(subdir-m)
34 # Unfortunately, we don't have information about ordering between -y
35 # and -m subdirs. Just put -y's first.
36 modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
38 __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39 subdir-y += $(__subdir-y)
40 __subdir-Y := $(patsubst %/,%,$(filter %/, $(obj-Y)))
41 subdir-Y += $(__subdir-Y)
42 __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
43 subdir-m += $(__subdir-m)
44 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
45 obj-m := $(filter-out %/, $(obj-m))
47 # Subdirectories we need to descend into
49 subdir-ym := $(sort $(subdir-y) $(subdir-Y) $(subdir-m))
51 # if $(foo-objs) exists, foo.o is a composite object
52 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
53 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
54 multi-used := $(multi-used-y) $(multi-used-m)
55 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
57 # Build list of the parts of our composite objects, our composite
58 # objects depend on those (obviously)
59 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
60 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
61 multi-objs := $(multi-objs-y) $(multi-objs-m)
63 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
64 # tell kbuild to descend
65 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
67 # $(obj-dirs) is a list of directories that contain object files
68 obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
70 # Replace multi-part objects by their individual parts, look at local dir only
71 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)
72 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
76 extra-y := $(addprefix $(obj)/,$(extra-y))
77 always := $(addprefix $(obj)/,$(always))
78 targets := $(addprefix $(obj)/,$(targets))
79 modorder := $(addprefix $(obj)/,$(modorder))
80 obj-y := $(addprefix $(obj)/,$(obj-y))
81 obj-Y := $(addprefix $(obj)/,$(obj-Y))
82 obj-m := $(addprefix $(obj)/,$(obj-m))
83 lib-y := $(addprefix $(obj)/,$(lib-y))
84 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
85 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
86 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
87 single-used-m := $(addprefix $(obj)/,$(single-used-m))
88 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
89 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
90 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
91 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
92 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
93 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
95 # These flags are needed for modversions and compiling, so we define them here
97 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
98 # end up in (or would, if it gets compiled in)
99 # Note: It's possible that one object gets potentially linked into more
100 # than one module. In that case KBUILD_MODNAME will be set to foo_bar,
101 # where foo and bar are the name of the modules.
102 name-fix = $(subst $(comma),_,$(subst -,_,$1))
103 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
104 modname_flags = $(if $(filter 1,$(words $(modname))),\
105 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
108 ifdef CONFIG_DYNAMIC_DEBUG
109 debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
110 -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
115 orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
116 $(ccflags-y) $(CFLAGS_$(basetarget).o)
117 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
118 _a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
119 $(asflags-y) $(AFLAGS_$(basetarget).o)
120 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
123 # Enable gcov profiling flags for a file, directory or for all files depending
124 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
127 ifeq ($(CONFIG_GCOV_KERNEL),y)
128 _c_flags += $(if $(patsubst n%,, \
129 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
133 # If building the kernel in a separate objtree expand all occurrences
134 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
136 ifeq ($(KBUILD_SRC),)
137 __c_flags = $(_c_flags)
138 __a_flags = $(_a_flags)
139 __cpp_flags = $(_cpp_flags)
142 # -I$(obj) locates generated .h files
143 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
144 # and locates generated .h files
145 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
146 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
147 __a_flags = $(call flags,_a_flags)
148 __cpp_flags = $(call flags,_cpp_flags)
151 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
152 $(__c_flags) $(modkern_cflags) \
153 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
156 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
157 $(__a_flags) $(modkern_aflags)
159 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
162 ld_flags = $(LDFLAGS) $(ldflags-y)
164 # Finds the multi-part object the current object will be linked into
165 modname-multi = $(sort $(foreach m,$(multi-used),\
166 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
169 # ===========================================================================
171 quiet_cmd_shipped = SHIPPED $@
172 cmd_shipped = cat $< > $@
174 $(obj)/%:: $(src)/%_shipped
177 # Commands useful for building a boot image
178 # ===========================================================================
182 # target: source(s) FORCE
183 # $(if_changed,ld/objcopy/gzip)
185 # and add target to extra-y so that we know we have to
186 # read in the saved command line
189 # ---------------------------------------------------------------------------
192 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
193 $(filter-out FORCE,$^) -o $@
196 # ---------------------------------------------------------------------------
198 quiet_cmd_objcopy = OBJCOPY $@
199 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
202 # ---------------------------------------------------------------------------
204 quiet_cmd_gzip = GZIP $@
205 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
210 # ---------------------------------------------------------------------------
212 # Bzip2 and LZMA do not include size in file... so we have to fake that;
213 # append the size as a 32-bit littleendian number as gzip does.
214 size_append = /bin/echo -ne $(shell \
217 fsize=$$(stat -c "%s" $$F); \
218 dec_size=$$(expr $$dec_size + $$fsize); \
220 printf "%08x" $$dec_size | \
221 sed 's/\(..\)\(..\)\(..\)\(..\)/\\\\x\4\\\\x\3\\\\x\2\\\\x\1/g' \
224 quiet_cmd_bzip2 = BZIP2 $@
225 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
226 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
230 # ---------------------------------------------------------------------------
232 quiet_cmd_lzma = LZMA $@
233 cmd_lzma = (cat $(filter-out FORCE,$^) | \
234 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \