blob: ea48b82a37076123c09c04346f796bc8e68da5db [file] [log] [blame]
Sam Ravnborgf77bf012007-10-15 22:25:06 +02001# Backward compatibility
2asflags-y += $(EXTRA_AFLAGS)
3ccflags-y += $(EXTRA_CFLAGS)
4cppflags-y += $(EXTRA_CPPFLAGS)
5ldflags-y += $(EXTRA_LDFLAGS)
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007# Figure out what we need to build from the various variables
8# ===========================================================================
9
10# When an object is listed to be built compiled-in and modular,
11# only build the compiled-in version
12
13obj-m := $(filter-out $(obj-y),$(obj-m))
14
15# Libraries are always collected in one lib file.
16# Filter out objects already built-in
17
18lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
19
20
21# Handle objects in subdirs
22# ---------------------------------------------------------------------------
23# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
24# and add the directory to the list of dirs to descend into: $(subdir-y)
25# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
26# and add the directory to the list of dirs to descend into: $(subdir-m)
27
Tejun Heo551559e2007-12-07 21:04:30 +090028# Determine modorder.
29# Unfortunately, we don't have information about ordering between -y
30# and -m subdirs. Just put -y's first.
31modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
32
Linus Torvalds1da177e2005-04-16 15:20:36 -070033__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
34subdir-y += $(__subdir-y)
35__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
36subdir-m += $(__subdir-m)
37obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
38obj-m := $(filter-out %/, $(obj-m))
39
40# Subdirectories we need to descend into
41
42subdir-ym := $(sort $(subdir-y) $(subdir-m))
43
44# if $(foo-objs) exists, foo.o is a composite object
45multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
46multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
47multi-used := $(multi-used-y) $(multi-used-m)
48single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
49
50# Build list of the parts of our composite objects, our composite
51# objects depend on those (obviously)
52multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
53multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
54multi-objs := $(multi-objs-y) $(multi-objs-m)
55
Sam Ravnborgf5fb9762007-09-15 08:55:39 +020056# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
57# tell kbuild to descend
58subdir-obj-y := $(filter %/built-in.o, $(obj-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60# $(obj-dirs) is a list of directories that contain object files
61obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
62
63# Replace multi-part objects by their individual parts, look at local dir only
64real-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)
65real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
66
67# Add subdir path
68
69extra-y := $(addprefix $(obj)/,$(extra-y))
70always := $(addprefix $(obj)/,$(always))
71targets := $(addprefix $(obj)/,$(targets))
Tejun Heo551559e2007-12-07 21:04:30 +090072modorder := $(addprefix $(obj)/,$(modorder))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073obj-y := $(addprefix $(obj)/,$(obj-y))
74obj-m := $(addprefix $(obj)/,$(obj-m))
75lib-y := $(addprefix $(obj)/,$(lib-y))
76subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
77real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
78real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
79single-used-m := $(addprefix $(obj)/,$(single-used-m))
80multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
81multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
82multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
83multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
84subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
85obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087# These flags are needed for modversions and compiling, so we define them here
88# already
89# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
90# end up in (or would, if it gets compiled in)
91# Note: It's possible that one object gets potentially linked into more
92# than one module. In that case KBUILD_MODNAME will be set to foo_bar,
93# where foo and bar are the name of the modules.
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040094name-fix = $(subst $(comma),_,$(subst -,_,$1))
Sam Ravnborg5e8d7802006-07-01 09:58:02 +020095basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040096modname_flags = $(if $(filter 1,$(words $(modname))),\
97 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Steven Rostedt656ee822008-05-14 21:30:29 -040099orig_c_flags = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o)
100_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200101_a_flags = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o)
102_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104# If building the kernel in a separate objtree expand all occurrences
105# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
106
107ifeq ($(KBUILD_SRC),)
108__c_flags = $(_c_flags)
109__a_flags = $(_a_flags)
110__cpp_flags = $(_cpp_flags)
111else
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113# -I$(obj) locates generated .h files
114# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
115# and locates generated .h files
116# FIXME: Replace both with specific CFLAGS* statements in the makefiles
117__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
118__a_flags = $(call flags,_a_flags)
119__cpp_flags = $(call flags,_cpp_flags)
120endif
121
Sam Ravnborg06c50402007-10-15 22:17:25 +0200122c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 $(__c_flags) $(modkern_cflags) \
Ustyugov Romanf83b5e32005-09-23 08:42:11 +0400124 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Sam Ravnborg06c50402007-10-15 22:17:25 +0200126a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 $(__a_flags) $(modkern_aflags)
128
129cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
130
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200131ld_flags = $(LDFLAGS) $(ldflags-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133# Finds the multi-part object the current object will be linked into
134modname-multi = $(sort $(foreach m,$(multi-used),\
135 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
136
137# Shipped files
138# ===========================================================================
139
140quiet_cmd_shipped = SHIPPED $@
141cmd_shipped = cat $< > $@
142
143$(obj)/%:: $(src)/%_shipped
144 $(call cmd,shipped)
145
146# Commands useful for building a boot image
147# ===========================================================================
148#
149# Use as following:
150#
151# target: source(s) FORCE
152# $(if_changed,ld/objcopy/gzip)
153#
Sam Ravnborg836caba2007-09-30 20:34:36 +0200154# and add target to extra-y so that we know we have to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155# read in the saved command line
156
157# Linking
158# ---------------------------------------------------------------------------
159
160quiet_cmd_ld = LD $@
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200161cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 $(filter-out FORCE,$^) -o $@
163
164# Objcopy
165# ---------------------------------------------------------------------------
166
167quiet_cmd_objcopy = OBJCOPY $@
168cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
169
170# Gzip
171# ---------------------------------------------------------------------------
172
173quiet_cmd_gzip = GZIP $@
174cmd_gzip = gzip -f -9 < $< > $@
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176