1 # Backward compatibility - to be removed...
2 extra-y += $(EXTRA_TARGETS)
3 # Figure out what we need to build from the various variables
4 # ===========================================================================
6 # When an object is listed to be built compiled-in and modular,
7 # only build the compiled-in version
9 obj-m := $(filter-out $(obj-y),$(obj-m))
11 # Libraries are always collected in one lib file.
12 # Filter out objects already built-in
14 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
17 # Handle objects in subdirs
18 # ---------------------------------------------------------------------------
19 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
20 # and add the directory to the list of dirs to descend into: $(subdir-y)
21 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
22 # and add the directory to the list of dirs to descend into: $(subdir-m)
24 __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
25 subdir-y += $(__subdir-y)
26 __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
27 subdir-m += $(__subdir-m)
28 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
29 obj-m := $(filter-out %/, $(obj-m))
31 # Subdirectories we need to descend into
33 subdir-ym := $(sort $(subdir-y) $(subdir-m))
35 # if $(foo-objs) exists, foo.o is a composite object
36 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
37 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
38 multi-used := $(multi-used-y) $(multi-used-m)
39 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
41 # Build list of the parts of our composite objects, our composite
42 # objects depend on those (obviously)
43 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
44 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
45 multi-objs := $(multi-objs-y) $(multi-objs-m)
47 # $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
48 # in the local directory
49 subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
51 # $(obj-dirs) is a list of directories that contain object files
52 obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
54 # Replace multi-part objects by their individual parts, look at local dir only
55 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)
56 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
60 extra-y := $(addprefix $(obj)/,$(extra-y))
61 always := $(addprefix $(obj)/,$(always))
62 targets := $(addprefix $(obj)/,$(targets))
63 obj-y := $(addprefix $(obj)/,$(obj-y))
64 obj-m := $(addprefix $(obj)/,$(obj-m))
65 lib-y := $(addprefix $(obj)/,$(lib-y))
66 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
67 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
68 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
69 single-used-m := $(addprefix $(obj)/,$(single-used-m))
70 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
71 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
72 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
73 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
74 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
75 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
77 # These flags are needed for modversions and compiling, so we define them here
79 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
80 # end up in (or would, if it gets compiled in)
81 # Note: It's possible that one object gets potentially linked into more
82 # than one module. In that case KBUILD_MODNAME will be set to foo_bar,
83 # where foo and bar are the name of the modules.
84 name-fix = $(subst $(comma),_,$(subst -,_,$1))
85 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))"
86 modname_flags = $(if $(filter 1,$(words $(modname))),\
87 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
89 _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
90 _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
91 _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
93 # If building the kernel in a separate objtree expand all occurrences
94 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
97 __c_flags = $(_c_flags)
98 __a_flags = $(_a_flags)
99 __cpp_flags = $(_cpp_flags)
102 # -I$(obj) locates generated .h files
103 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
104 # and locates generated .h files
105 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
106 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
107 __a_flags = $(call flags,_a_flags)
108 __cpp_flags = $(call flags,_cpp_flags)
111 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
112 $(__c_flags) $(modkern_cflags) \
113 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
115 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
116 $(__a_flags) $(modkern_aflags)
118 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
120 ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
122 # Finds the multi-part object the current object will be linked into
123 modname-multi = $(sort $(foreach m,$(multi-used),\
124 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
127 # ===========================================================================
129 quiet_cmd_shipped = SHIPPED $@
130 cmd_shipped = cat $< > $@
132 $(obj)/%:: $(src)/%_shipped
135 # Commands useful for building a boot image
136 # ===========================================================================
140 # target: source(s) FORCE
141 # $(if_changed,ld/objcopy/gzip)
143 # and add target to EXTRA_TARGETS so that we know we have to
144 # read in the saved command line
147 # ---------------------------------------------------------------------------
150 cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
151 $(filter-out FORCE,$^) -o $@
154 # ---------------------------------------------------------------------------
156 quiet_cmd_objcopy = OBJCOPY $@
157 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
160 # ---------------------------------------------------------------------------
162 quiet_cmd_gzip = GZIP $@
163 cmd_gzip = gzip -f -9 < $< > $@