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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
Sam Ravnborg720097d2009-04-19 11:04:26 +02007#
8# flags that take effect in sub directories
9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012# Figure out what we need to build from the various variables
13# ===========================================================================
14
15# When an object is listed to be built compiled-in and modular,
16# only build the compiled-in version
17
18obj-m := $(filter-out $(obj-y),$(obj-m))
19
20# Libraries are always collected in one lib file.
21# Filter out objects already built-in
22
23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
24
25
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)
32
Tejun Heo551559e2007-12-07 21:04:30 +090033# Determine modorder.
34# Unfortunately, we don't have information about ordering between -y
35# and -m subdirs. Just put -y's first.
36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39subdir-y += $(__subdir-y)
40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41subdir-m += $(__subdir-m)
42obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43obj-m := $(filter-out %/, $(obj-m))
44
45# Subdirectories we need to descend into
46
47subdir-ym := $(sort $(subdir-y) $(subdir-m))
48
49# if $(foo-objs) exists, foo.o is a composite object
50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
52multi-used := $(multi-used-y) $(multi-used-m)
53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
54
55# Build list of the parts of our composite objects, our composite
56# objects depend on those (obviously)
57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59multi-objs := $(multi-objs-y) $(multi-objs-m)
60
Sam Ravnborgf5fb9762007-09-15 08:55:39 +020061# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62# tell kbuild to descend
63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65# $(obj-dirs) is a list of directories that contain object files
66obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
67
68# Replace multi-part objects by their individual parts, look at local dir only
69real-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)
70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
71
72# Add subdir path
73
74extra-y := $(addprefix $(obj)/,$(extra-y))
75always := $(addprefix $(obj)/,$(always))
76targets := $(addprefix $(obj)/,$(targets))
Tejun Heo551559e2007-12-07 21:04:30 +090077modorder := $(addprefix $(obj)/,$(modorder))
Linus Torvalds1da177e2005-04-16 15:20:36 -070078obj-y := $(addprefix $(obj)/,$(obj-y))
79obj-m := $(addprefix $(obj)/,$(obj-m))
80lib-y := $(addprefix $(obj)/,$(lib-y))
81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84single-used-m := $(addprefix $(obj)/,$(single-used-m))
85multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092# These flags are needed for modversions and compiling, so we define them here
93# already
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.
Ustyugov Romanf83b5e32005-09-23 08:42:11 +040099name-fix = $(subst $(comma),_,$(subst -,_,$1))
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
Ustyugov Romanf83b5e32005-09-23 08:42:11 +0400101modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Sam Ravnborg720097d2009-04-19 11:04:26 +0200104orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100105 $(ccflags-y) $(CFLAGS_$(basetarget).o)
Steven Rostedt656ee822008-05-14 21:30:29 -0400106_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
Sam Ravnborg720097d2009-04-19 11:04:26 +0200107_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100108 $(asflags-y) $(AFLAGS_$(basetarget).o)
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200109_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Peter Oberparleiter2521f2c2009-06-17 16:28:08 -0700111#
112# Enable gcov profiling flags for a file, directory or for all files depending
113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
114# (in this order)
115#
116ifeq ($(CONFIG_GCOV_KERNEL),y)
117_c_flags += $(if $(patsubst n%,, \
118 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
119 $(CFLAGS_GCOV))
120endif
121
Alan Jenkins9e1b9b82009-11-07 21:03:54 +0000122ifdef CONFIG_SYMBOL_PREFIX
Mike Frysingerd63f6d12010-10-19 16:11:53 -0400123_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
124_cpp_flags += $(_sym_flags)
125_a_flags += $(_sym_flags)
Alan Jenkins9e1b9b82009-11-07 21:03:54 +0000126endif
127
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129# If building the kernel in a separate objtree expand all occurrences
130# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
131
132ifeq ($(KBUILD_SRC),)
133__c_flags = $(_c_flags)
134__a_flags = $(_a_flags)
135__cpp_flags = $(_cpp_flags)
136else
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138# -I$(obj) locates generated .h files
139# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
140# and locates generated .h files
141# FIXME: Replace both with specific CFLAGS* statements in the makefiles
142__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
143__a_flags = $(call flags,_a_flags)
144__cpp_flags = $(call flags,_cpp_flags)
145endif
146
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100147c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
148 $(__c_flags) $(modkern_cflags) \
Jason Baron52159d92010-09-17 11:09:17 -0400149 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100151a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 $(__a_flags) $(modkern_aflags)
153
Sam Ravnborgd8672b42008-11-21 21:50:02 +0100154cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
155 $(__cpp_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200157ld_flags = $(LDFLAGS) $(ldflags-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
159# Finds the multi-part object the current object will be linked into
160modname-multi = $(sort $(foreach m,$(multi-used),\
161 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
162
163# Shipped files
164# ===========================================================================
165
166quiet_cmd_shipped = SHIPPED $@
167cmd_shipped = cat $< > $@
168
169$(obj)/%:: $(src)/%_shipped
170 $(call cmd,shipped)
171
172# Commands useful for building a boot image
173# ===========================================================================
174#
175# Use as following:
176#
177# target: source(s) FORCE
178# $(if_changed,ld/objcopy/gzip)
179#
Sam Ravnborg836caba2007-09-30 20:34:36 +0200180# and add target to extra-y so that we know we have to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181# read in the saved command line
182
183# Linking
184# ---------------------------------------------------------------------------
185
186quiet_cmd_ld = LD $@
Sam Ravnborgf77bf012007-10-15 22:25:06 +0200187cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 $(filter-out FORCE,$^) -o $@
189
190# Objcopy
191# ---------------------------------------------------------------------------
192
193quiet_cmd_objcopy = OBJCOPY $@
194cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
195
196# Gzip
197# ---------------------------------------------------------------------------
198
199quiet_cmd_gzip = GZIP $@
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700200cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
201 (rm -f $@ ; false)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
Alain Knaffbc22c172009-01-04 22:46:16 +0100204# Bzip2
205# ---------------------------------------------------------------------------
206
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700207# Bzip2 and LZMA do not include size in file... so we have to fake that;
208# append the size as a 32-bit littleendian number as gzip does.
Michael Tokarev4a2ff672009-10-13 22:22:46 +0200209size_append = printf $(shell \
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700210dec_size=0; \
211for F in $1; do \
212 fsize=$$(stat -c "%s" $$F); \
213 dec_size=$$(expr $$dec_size + $$fsize); \
214done; \
Jonathan Nieder13734112009-12-28 19:38:27 +0000215printf "%08x\n" $$dec_size | \
216 sed 's/\(..\)/\1 /g' | { \
217 read ch0 ch1 ch2 ch3; \
218 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
219 printf '%s%03o' '\\' $$((0x$$ch)); \
220 done; \
221 } \
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700222)
Alain Knaffbc22c172009-01-04 22:46:16 +0100223
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700224quiet_cmd_bzip2 = BZIP2 $@
225cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
226 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
227 (rm -f $@ ; false)
Alain Knaffbc22c172009-01-04 22:46:16 +0100228
229# Lzma
230# ---------------------------------------------------------------------------
231
232quiet_cmd_lzma = LZMA $@
H. Peter Anvind3dd3b52009-05-05 21:17:15 -0700233cmd_lzma = (cat $(filter-out FORCE,$^) | \
234 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
235 (rm -f $@ ; false)
Albin Tonnerre7dd65fe2010-01-08 14:42:42 -0800236
Wu Zhangjin2d74b2c2010-03-11 17:42:14 +0800237quiet_cmd_lzo = LZO $@
Albin Tonnerre7dd65fe2010-01-08 14:42:42 -0800238cmd_lzo = (cat $(filter-out FORCE,$^) | \
239 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
240 (rm -f $@ ; false)
Borislav Petkovd61931d2010-03-05 17:34:46 +0100241
242# misc stuff
243# ---------------------------------------------------------------------------
244quote:="