1 # Backward compatibility
2 asflags-y += $(EXTRA_AFLAGS)
3 ccflags-y += $(EXTRA_CFLAGS)
4 cppflags-y += $(EXTRA_CPPFLAGS)
5 ldflags-y += $(EXTRA_LDFLAGS)
8 # flags that take effect in sub directories
9 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
10 export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
12 # Figure out what we need to build from the various variables
13 # ===========================================================================
15 # When an object is listed to be built compiled-in and modular,
16 # only build the compiled-in version
18 obj-m := $(filter-out $(obj-y),$(obj-m))
20 # Libraries are always collected in one lib file.
21 # Filter out objects already built-in
23 lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
25 # Remove objects forcibly disabled
27 obj-y := $(filter-out $(disabled-obj-y),$(obj-y))
28 obj-m := $(filter-out $(disabled-obj-y),$(obj-m))
29 lib-y := $(filter-out $(disabled-obj-y),$(lib-y))
32 # Handle objects in subdirs
33 # ---------------------------------------------------------------------------
34 # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
35 # and add the directory to the list of dirs to descend into: $(subdir-y)
36 # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
37 # and add the directory to the list of dirs to descend into: $(subdir-m)
40 # Unfortunately, we don't have information about ordering between -y
41 # and -m subdirs. Just put -y's first.
42 modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
44 __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
45 subdir-y += $(__subdir-y)
46 __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
47 subdir-m += $(__subdir-m)
48 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
49 obj-m := $(filter-out %/, $(obj-m))
51 # Subdirectories we need to descend into
53 subdir-ym := $(sort $(subdir-y) $(subdir-m))
55 # if $(foo-objs) exists, foo.o is a composite object
56 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
57 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
58 multi-used := $(multi-used-y) $(multi-used-m)
59 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
61 # Build list of the parts of our composite objects, our composite
62 # objects depend on those (obviously)
63 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
64 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
65 multi-objs := $(multi-objs-y) $(multi-objs-m)
67 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
68 # tell kbuild to descend
69 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
71 # $(obj-dirs) is a list of directories that contain object files
72 obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
74 # Replace multi-part objects by their individual parts, look at local dir only
75 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)
76 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
80 extra-y := $(addprefix $(obj)/,$(extra-y))
81 always := $(addprefix $(obj)/,$(always))
82 targets := $(addprefix $(obj)/,$(targets))
83 modorder := $(addprefix $(obj)/,$(modorder))
84 obj-y := $(addprefix $(obj)/,$(obj-y))
85 obj-m := $(addprefix $(obj)/,$(obj-m))
86 lib-y := $(addprefix $(obj)/,$(lib-y))
87 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
88 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
89 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
90 single-used-m := $(addprefix $(obj)/,$(single-used-m))
91 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
92 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
93 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
94 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
95 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
96 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
98 # These flags are needed for modversions and compiling, so we define them here
100 # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
101 # end up in (or would, if it gets compiled in)
102 # Note: Files that end up in two or more modules are compiled without the
103 # KBUILD_MODNAME definition. The reason is that any made-up name would
104 # differ in different configs.
105 name-fix = $(subst $(comma),_,$(subst -,_,$1))
106 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
107 modname_flags = $(if $(filter 1,$(words $(modname))),\
108 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
110 orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
111 $(ccflags-y) $(CFLAGS_$(basetarget).o)
112 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
113 _a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
114 $(asflags-y) $(AFLAGS_$(basetarget).o)
115 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
118 # Enable gcov profiling flags for a file, directory or for all files depending
119 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
122 ifeq ($(CONFIG_GCOV_KERNEL),y)
123 _c_flags += $(if $(patsubst n%,, \
124 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
128 ifdef CONFIG_SYMBOL_PREFIX
129 _sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
130 _cpp_flags += $(_sym_flags)
131 _a_flags += $(_sym_flags)
135 # If building the kernel in a separate objtree expand all occurrences
136 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
138 ifeq ($(KBUILD_SRC),)
139 __c_flags = $(_c_flags)
140 __a_flags = $(_a_flags)
141 __cpp_flags = $(_cpp_flags)
144 # -I$(obj) locates generated .h files
145 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
146 # and locates generated .h files
147 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
148 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
149 __a_flags = $(call flags,_a_flags)
150 __cpp_flags = $(call flags,_cpp_flags)
153 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
154 $(__c_flags) $(modkern_cflags) \
155 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
157 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
158 $(__a_flags) $(modkern_aflags)
160 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
163 ld_flags = $(LDFLAGS) $(ldflags-y)
165 # Finds the multi-part object the current object will be linked into
166 modname-multi = $(sort $(foreach m,$(multi-used),\
167 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
169 ifdef REGENERATE_PARSERS
172 # ---------------------------------------------------------------------------
173 quiet_cmd_gperf = GPERF $@
174 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
176 .PRECIOUS: $(src)/%.hash.c_shipped
177 $(src)/%.hash.c_shipped: $(src)/%.gperf
181 # ---------------------------------------------------------------------------
182 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
184 quiet_cmd_flex = LEX $@
185 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
187 .PRECIOUS: $(src)/%.lex.c_shipped
188 $(src)/%.lex.c_shipped: $(src)/%.l
192 # ---------------------------------------------------------------------------
193 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
195 quiet_cmd_bison = YACC $@
196 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
198 .PRECIOUS: $(src)/%.tab.c_shipped
199 $(src)/%.tab.c_shipped: $(src)/%.y
202 quiet_cmd_bison_h = YACC $@
203 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
205 .PRECIOUS: $(src)/%.tab.h_shipped
206 $(src)/%.tab.h_shipped: $(src)/%.y
212 # ===========================================================================
214 quiet_cmd_shipped = SHIPPED $@
215 cmd_shipped = cat $< > $@
217 $(obj)/%: $(src)/%_shipped
220 # Commands useful for building a boot image
221 # ===========================================================================
225 # target: source(s) FORCE
226 # $(if_changed,ld/objcopy/gzip)
228 # and add target to extra-y so that we know we have to
229 # read in the saved command line
232 # ---------------------------------------------------------------------------
235 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
236 $(filter-out FORCE,$^) -o $@
239 # ---------------------------------------------------------------------------
241 quiet_cmd_objcopy = OBJCOPY $@
242 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
245 # ---------------------------------------------------------------------------
247 quiet_cmd_gzip = GZIP $@
248 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
252 # ---------------------------------------------------------------------------
254 # Generate an assembly file to wrap the output of the device tree compiler
255 quiet_cmd_dt_S_dtb= DTB $@
258 echo '\#include <asm-generic/vmlinux.lds.h>'; \
259 echo '.section .dtb.init.rodata,"a"'; \
260 echo '.balign STRUCT_ALIGNMENT'; \
261 echo '.global __dtb_$(*F)_begin'; \
262 echo '__dtb_$(*F)_begin:'; \
263 echo '.incbin "$<" '; \
264 echo '__dtb_$(*F)_end:'; \
265 echo '.global __dtb_$(*F)_end'; \
266 echo '.balign STRUCT_ALIGNMENT'; \
269 $(obj)/%.dtb.S: $(obj)/%.dtb
272 quiet_cmd_dtc = DTC $@
273 cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
276 # ---------------------------------------------------------------------------
278 # Bzip2 and LZMA do not include size in file... so we have to fake that;
279 # append the size as a 32-bit littleendian number as gzip does.
280 size_append = printf $(shell \
283 fsize=$$(stat -c "%s" $$F); \
284 dec_size=$$(expr $$dec_size + $$fsize); \
286 printf "%08x\n" $$dec_size | \
287 sed 's/\(..\)/\1 /g' | { \
288 read ch0 ch1 ch2 ch3; \
289 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
290 printf '%s%03o' '\\' $$((0x$$ch)); \
295 quiet_cmd_bzip2 = BZIP2 $@
296 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
297 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
301 # ---------------------------------------------------------------------------
303 quiet_cmd_lzma = LZMA $@
304 cmd_lzma = (cat $(filter-out FORCE,$^) | \
305 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
308 quiet_cmd_lzo = LZO $@
309 cmd_lzo = (cat $(filter-out FORCE,$^) | \
310 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
314 # ---------------------------------------------------------------------------
316 MKIMAGE := $(srctree)/scripts/mkuboot.sh
318 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
319 # the number of overrides in arch makefiles
320 UIMAGE_ARCH ?= $(SRCARCH)
321 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
323 UIMAGE_TYPE ?= kernel
324 UIMAGE_LOADADDR ?= arch_must_set_this
325 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
326 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
330 quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
331 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
332 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
334 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
335 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
338 # ---------------------------------------------------------------------------
339 # Use xzkern to compress the kernel image and xzmisc to compress other things.
341 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
342 # of the kernel decompressor. A BCJ filter is used if it is available for
343 # the target architecture. xzkern also appends uncompressed size of the data
344 # using size_append. The .xz format has the size information available at
345 # the end of the file too, but it's in more complex format and it's good to
346 # avoid changing the part of the boot code that reads the uncompressed size.
347 # Note that the bytes added by size_append will make the xz tool think that
348 # the file is corrupt. This is expected.
350 # xzmisc doesn't use size_append, so it can be used to create normal .xz
351 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
352 # big dictionary would increase the memory usage too much in the multi-call
353 # decompression mode. A BCJ filter isn't used either.
354 quiet_cmd_xzkern = XZKERN $@
355 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
356 sh $(srctree)/scripts/xz_wrap.sh && \
357 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
360 quiet_cmd_xzmisc = XZMISC $@
361 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
362 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
366 # ---------------------------------------------------------------------------