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))
119 # If building the kernel in a separate objtree expand all occurrences
120 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
122 ifeq ($(KBUILD_SRC),)
123 __c_flags = $(_c_flags)
124 __a_flags = $(_a_flags)
125 __cpp_flags = $(_cpp_flags)
128 # -I$(obj) locates generated .h files
129 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
130 # and locates generated .h files
131 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
132 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
133 __a_flags = $(call flags,_a_flags)
134 __cpp_flags = $(call flags,_cpp_flags)
137 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
138 $(__c_flags) $(modkern_cflags) \
139 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
142 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
143 $(__a_flags) $(modkern_aflags)
145 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
148 ld_flags = $(LDFLAGS) $(ldflags-y)
150 # Finds the multi-part object the current object will be linked into
151 modname-multi = $(sort $(foreach m,$(multi-used),\
152 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
155 # ===========================================================================
157 quiet_cmd_shipped = SHIPPED $@
158 cmd_shipped = cat $< > $@
160 $(obj)/%:: $(src)/%_shipped
163 # Commands useful for building a boot image
164 # ===========================================================================
168 # target: source(s) FORCE
169 # $(if_changed,ld/objcopy/gzip)
171 # and add target to extra-y so that we know we have to
172 # read in the saved command line
175 # ---------------------------------------------------------------------------
178 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
179 $(filter-out FORCE,$^) -o $@
182 # ---------------------------------------------------------------------------
184 quiet_cmd_objcopy = OBJCOPY $@
185 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
188 # ---------------------------------------------------------------------------
190 quiet_cmd_gzip = GZIP $@
191 cmd_gzip = gzip -f -9 < $< > $@
195 # ---------------------------------------------------------------------------
197 # Bzip2 does not include size in file... so we have to fake that
198 size_append=$(CONFIG_SHELL) $(srctree)/scripts/bin_size
200 quiet_cmd_bzip2 = BZIP2 $@
201 cmd_bzip2 = (bzip2 -9 < $< && $(size_append) $<) > $@ || (rm -f $@ ; false)
204 # ---------------------------------------------------------------------------
206 quiet_cmd_lzma = LZMA $@
207 cmd_lzma = (lzma -9 -c $< && $(size_append) $<) >$@ || (rm -f $@ ; false)