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Linus Torvalds1da177e2005-04-16 15:20:36 -07001# 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070077# These flags are needed for modversions and compiling, so we define them here
78# already
79# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
80# end up in (or would, if it gets compiled in)
81# Note: It's possible that one object gets potentially linked into more
82# than one module. In that case KBUILD_MODNAME will be set to foo_bar,
83# where foo and bar are the name of the modules.
84basename_flags = -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F)))
85modname_flags = $(if $(filter 1,$(words $(modname))),-DKBUILD_MODNAME=$(subst $(comma),_,$(subst -,_,$(modname))))
86
87_c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
88_a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
89_cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
90
91# If building the kernel in a separate objtree expand all occurrences
92# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
93
94ifeq ($(KBUILD_SRC),)
95__c_flags = $(_c_flags)
96__a_flags = $(_a_flags)
97__cpp_flags = $(_cpp_flags)
98else
99
100# Prefix -I with $(srctree) if it is not an absolute path
101addtree = $(if $(filter-out -I/%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1)
102# Find all -I options and call addtree
103flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
104
105# -I$(obj) locates generated .h files
106# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
107# and locates generated .h files
108# FIXME: Replace both with specific CFLAGS* statements in the makefiles
109__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
110__a_flags = $(call flags,_a_flags)
111__cpp_flags = $(call flags,_cpp_flags)
112endif
113
114c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
115 $(__c_flags) $(modkern_cflags) \
116 $(basename_flags) $(modname_flags)
117
118a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
119 $(__a_flags) $(modkern_aflags)
120
121cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
122
123ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
124
125# Finds the multi-part object the current object will be linked into
126modname-multi = $(sort $(foreach m,$(multi-used),\
127 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
128
129# Shipped files
130# ===========================================================================
131
132quiet_cmd_shipped = SHIPPED $@
133cmd_shipped = cat $< > $@
134
135$(obj)/%:: $(src)/%_shipped
136 $(call cmd,shipped)
137
138# Commands useful for building a boot image
139# ===========================================================================
140#
141# Use as following:
142#
143# target: source(s) FORCE
144# $(if_changed,ld/objcopy/gzip)
145#
146# and add target to EXTRA_TARGETS so that we know we have to
147# read in the saved command line
148
149# Linking
150# ---------------------------------------------------------------------------
151
152quiet_cmd_ld = LD $@
153cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
154 $(filter-out FORCE,$^) -o $@
155
156# Objcopy
157# ---------------------------------------------------------------------------
158
159quiet_cmd_objcopy = OBJCOPY $@
160cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
161
162# Gzip
163# ---------------------------------------------------------------------------
164
165quiet_cmd_gzip = GZIP $@
166cmd_gzip = gzip -f -9 < $< > $@
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168