1# Backward compatibility - to be removed...
2extra-y	+= $(EXTRA_TARGETS)
3# Figure out what we need to build from the various variables
4# ===========================================================================
5
6# When an object is listed to be built compiled-in and modular,
7# only build the compiled-in version
8
9obj-m := $(filter-out $(obj-y),$(obj-m))
10
11# Libraries are always collected in one lib file.
12# Filter out objects already built-in
13
14lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
15
16
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)
23
24__subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
25subdir-y	+= $(__subdir-y)
26__subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
27subdir-m	+= $(__subdir-m)
28obj-y		:= $(patsubst %/, %/built-in.o, $(obj-y))
29obj-m		:= $(filter-out %/, $(obj-m))
30
31# Subdirectories we need to descend into
32
33subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
34
35# if $(foo-objs) exists, foo.o is a composite object
36multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
37multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
38multi-used   := $(multi-used-y) $(multi-used-m)
39single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
40
41# Build list of the parts of our composite objects, our composite
42# objects depend on those (obviously)
43multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
44multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
45multi-objs   := $(multi-objs-y) $(multi-objs-m)
46
47# $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
48# in the local directory
49subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
50
51# $(obj-dirs) is a list of directories that contain object files
52obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
53
54# Replace multi-part objects by their individual parts, look at local dir only
55real-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)
56real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
57
58# Add subdir path
59
60extra-y		:= $(addprefix $(obj)/,$(extra-y))
61always		:= $(addprefix $(obj)/,$(always))
62targets		:= $(addprefix $(obj)/,$(targets))
63obj-y		:= $(addprefix $(obj)/,$(obj-y))
64obj-m		:= $(addprefix $(obj)/,$(obj-m))
65lib-y		:= $(addprefix $(obj)/,$(lib-y))
66subdir-obj-y	:= $(addprefix $(obj)/,$(subdir-obj-y))
67real-objs-y	:= $(addprefix $(obj)/,$(real-objs-y))
68real-objs-m	:= $(addprefix $(obj)/,$(real-objs-m))
69single-used-m	:= $(addprefix $(obj)/,$(single-used-m))
70multi-used-y	:= $(addprefix $(obj)/,$(multi-used-y))
71multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
72multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
73multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
74subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))
75obj-dirs	:= $(addprefix $(obj)/,$(obj-dirs))
76
77# These flags are needed for modversions and compiling, so we define them here
78# already
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.
84name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
85basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(*F))
86modname_flags  = $(if $(filter 1,$(words $(modname))),\
87                 -DKBUILD_MODNAME=$(call name-fix,$(modname)))
88
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))
92
93# If building the kernel in a separate objtree expand all occurrences
94# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
95
96ifeq ($(KBUILD_SRC),)
97__c_flags	= $(_c_flags)
98__a_flags	= $(_a_flags)
99__cpp_flags     = $(_cpp_flags)
100else
101
102# -I$(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     =                          $(call flags,_cpp_flags)
109endif
110
111c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
112		 $(__c_flags) $(modkern_cflags) \
113		 $(basename_flags) $(modname_flags)
114
115a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
116		 $(__a_flags) $(modkern_aflags)
117
118cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
119
120# Seems to be a wrong thing to do. LDFLAGS contains gcc's flags,
121# yet ld_flags is fed to ld.
122#ld_flags       = $(LDFLAGS) $(EXTRA_LDFLAGS)
123# Remove the -Wl, prefix from linker options normally passed through gcc
124ld_flags       = $(filter-out -Wl$(comma)%,$(LDFLAGS) $(EXTRA_LDFLAGS))
125
126
127# Finds the multi-part object the current object will be linked into
128modname-multi = $(sort $(foreach m,$(multi-used),\
129		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
130
131# Shipped files
132# ===========================================================================
133
134quiet_cmd_shipped = SHIPPED $@
135cmd_shipped = cat $< > $@
136
137$(obj)/%:: $(src)/%_shipped
138	$(call cmd,shipped)
139
140# Commands useful for building a boot image
141# ===========================================================================
142#
143#	Use as following:
144#
145#	target: source(s) FORCE
146#		$(if_changed,ld/objcopy/gzip)
147#
148#	and add target to EXTRA_TARGETS so that we know we have to
149#	read in the saved command line
150
151# Linking
152# ---------------------------------------------------------------------------
153
154# TODO: LDFLAGS usually is supposed to contain gcc's flags, not ld's.
155# but here we feed them to ld!
156quiet_cmd_ld = LD      $@
157cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
158	       $(filter-out FORCE,$^) -o $@
159
160# Objcopy
161# ---------------------------------------------------------------------------
162
163quiet_cmd_objcopy = OBJCOPY $@
164cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
165
166# Gzip
167# ---------------------------------------------------------------------------
168
169quiet_cmd_gzip = GZIP    $@
170cmd_gzip = gzip -f -9 < $< > $@
171