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-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41 subdir-m += $(__subdir-m)
42 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43 obj-m := $(filter-out %/, $(obj-m))
45 # Subdirectories we need to descend into
47 subdir-ym := $(sort $(subdir-y) $(subdir-m))
49 # if $(foo-objs) exists, foo.o is a composite object
50 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
52 multi-used := $(multi-used-y) $(multi-used-m)
53 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
55 # Build list of the parts of our composite objects, our composite
56 # objects depend on those (obviously)
57 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59 multi-objs := $(multi-objs-y) $(multi-objs-m)
61 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62 # tell kbuild to descend
63 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
65 # $(obj-dirs) is a list of directories that contain object files
66 obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
68 # Replace multi-part objects by their individual parts, look at local dir only
69 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)
70 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
74 extra-y := $(addprefix $(obj)/,$(extra-y))
75 always := $(addprefix $(obj)/,$(always))
76 targets := $(addprefix $(obj)/,$(targets))
77 modorder := $(addprefix $(obj)/,$(modorder))
78 obj-y := $(addprefix $(obj)/,$(obj-y))
79 obj-m := $(addprefix $(obj)/,$(obj-m))
80 lib-y := $(addprefix $(obj)/,$(lib-y))
81 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84 single-used-m := $(addprefix $(obj)/,$(single-used-m))
85 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
92 # These flags are needed for modversions and compiling, so we define them here
94 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
95 # end up in (or would, if it gets compiled in)
96 # Note: It's possible that one object gets potentially linked into more
97 # than one module. In that case KBUILD_MODNAME will be set to foo_bar,
98 # where foo and bar are the name of the modules.
99 name-fix = $(subst $(comma),_,$(subst -,_,$1))
100 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
101 modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
105 ifdef CONFIG_DYNAMIC_DEBUG
106 debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
107 -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
112 orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
113 $(ccflags-y) $(CFLAGS_$(basetarget).o)
114 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
115 _a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
116 $(asflags-y) $(AFLAGS_$(basetarget).o)
117 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
120 # Enable gcov profiling flags for a file, directory or for all files depending
121 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
124 ifeq ($(CONFIG_GCOV_KERNEL),y)
125 _c_flags += $(if $(patsubst n%,, \
126 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
130 ifdef CONFIG_SYMBOL_PREFIX
131 _cpp_flags += -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
135 # If building the kernel in a separate objtree expand all occurrences
136 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
138 ifeq ($(KBUILD_SRC),)
139 __c_flags = $(_c_flags)
140 __a_flags = $(_a_flags)
141 __cpp_flags = $(_cpp_flags)
144 # -I$(obj) locates generated .h files
145 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
146 # and locates generated .h files
147 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
148 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
149 __a_flags = $(call flags,_a_flags)
150 __cpp_flags = $(call flags,_cpp_flags)
153 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
154 $(__c_flags) $(modkern_cflags) \
155 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
158 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
159 $(__a_flags) $(modkern_aflags)
161 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
164 ld_flags = $(LDFLAGS) $(ldflags-y)
166 # Finds the multi-part object the current object will be linked into
167 modname-multi = $(sort $(foreach m,$(multi-used),\
168 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
171 # ===========================================================================
173 quiet_cmd_shipped = SHIPPED $@
174 cmd_shipped = cat $< > $@
176 $(obj)/%:: $(src)/%_shipped
179 # Commands useful for building a boot image
180 # ===========================================================================
184 # target: source(s) FORCE
185 # $(if_changed,ld/objcopy/gzip)
187 # and add target to extra-y so that we know we have to
188 # read in the saved command line
191 # ---------------------------------------------------------------------------
194 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
195 $(filter-out FORCE,$^) -o $@
198 # ---------------------------------------------------------------------------
200 quiet_cmd_objcopy = OBJCOPY $@
201 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
204 # ---------------------------------------------------------------------------
206 quiet_cmd_gzip = GZIP $@
207 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
212 # ---------------------------------------------------------------------------
214 # Bzip2 and LZMA do not include size in file... so we have to fake that;
215 # append the size as a 32-bit littleendian number as gzip does.
216 size_append = printf $(shell \
219 fsize=$$(stat -c "%s" $$F); \
220 dec_size=$$(expr $$dec_size + $$fsize); \
222 printf "%08x\n" $$dec_size | \
223 sed 's/\(..\)/\1 /g' | { \
224 read ch0 ch1 ch2 ch3; \
225 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
226 printf '%s%03o' '\\' $$((0x$$ch)); \
231 quiet_cmd_bzip2 = BZIP2 $@
232 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
233 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
237 # ---------------------------------------------------------------------------
239 quiet_cmd_lzma = LZMA $@
240 cmd_lzma = (cat $(filter-out FORCE,$^) | \
241 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
244 quiet_cmd_lzo = LZO $@
245 cmd_lzo = (cat $(filter-out FORCE,$^) | \
246 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
250 # ---------------------------------------------------------------------------