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)))
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)
34 # Unfortunately, we don't have information about ordering between -y
35 # and -m subdirs. Just put -y's first.
36 modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
38 __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
39 subdir-y += $(__subdir-y)
40 __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
41 subdir-m += $(__subdir-m)
42 obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
43 obj-m := $(filter-out %/, $(obj-m))
45 # Subdirectories we need to descend into
47 subdir-ym := $(sort $(subdir-y) $(subdir-m))
49 # if $(foo-objs) exists, foo.o is a composite object
50 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
51 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
52 multi-used := $(multi-used-y) $(multi-used-m)
53 single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
55 # Build list of the parts of our composite objects, our composite
56 # objects depend on those (obviously)
57 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
58 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
59 multi-objs := $(multi-objs-y) $(multi-objs-m)
61 # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
62 # tell kbuild to descend
63 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
65 # $(obj-dirs) is a list of directories that contain object files
66 obj-dirs := $(dir $(multi-objs) $(obj-y))
68 # Replace multi-part objects by their individual parts, look at local dir only
69 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)
70 real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
74 extra-y := $(addprefix $(obj)/,$(extra-y))
75 always := $(addprefix $(obj)/,$(always))
76 targets := $(addprefix $(obj)/,$(targets))
77 modorder := $(addprefix $(obj)/,$(modorder))
78 obj-y := $(addprefix $(obj)/,$(obj-y))
79 obj-m := $(addprefix $(obj)/,$(obj-m))
80 lib-y := $(addprefix $(obj)/,$(lib-y))
81 subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
82 real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
83 real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
84 single-used-m := $(addprefix $(obj)/,$(single-used-m))
85 multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
86 multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
87 multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
88 multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
89 subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
90 obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
92 # These flags are needed for modversions and compiling, so we define them here
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: Files that end up in two or more modules are compiled without the
97 # KBUILD_MODNAME definition. The reason is that any made-up name would
98 # differ in different configs.
99 name-fix = $(subst $(comma),_,$(subst -,_,$1))
100 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
101 modname_flags = $(if $(filter 1,$(words $(modname))),\
102 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
104 orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
105 $(ccflags-y) $(CFLAGS_$(basetarget).o)
106 _c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
107 _a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
108 $(asflags-y) $(AFLAGS_$(basetarget).o)
109 _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
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
116 ifeq ($(CONFIG_GCOV_KERNEL),y)
117 _c_flags += $(if $(patsubst n%,, \
118 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
122 # If building the kernel in a separate objtree expand all occurrences
123 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
125 ifeq ($(KBUILD_SRC),)
126 __c_flags = $(_c_flags)
127 __a_flags = $(_a_flags)
128 __cpp_flags = $(_cpp_flags)
131 # -I$(obj) locates generated .h files
132 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
133 # and locates generated .h files
134 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
135 __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
136 __a_flags = $(call flags,_a_flags)
137 __cpp_flags = $(call flags,_cpp_flags)
140 c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
141 $(__c_flags) $(modkern_cflags) \
142 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
144 a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
145 $(__a_flags) $(modkern_aflags)
147 cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
150 ld_flags = $(LDFLAGS) $(ldflags-y)
152 dtc_cpp_flags = -Wp,-MD,$(depfile).pre -nostdinc \
153 -I$(srctree)/arch/$(SRCARCH)/boot/dts \
154 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
157 # Finds the multi-part object the current object will be linked into
158 modname-multi = $(sort $(foreach m,$(multi-used),\
159 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
161 ifdef REGENERATE_PARSERS
164 # ---------------------------------------------------------------------------
165 quiet_cmd_gperf = GPERF $@
166 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
168 .PRECIOUS: $(src)/%.hash.c_shipped
169 $(src)/%.hash.c_shipped: $(src)/%.gperf
173 # ---------------------------------------------------------------------------
174 LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
176 quiet_cmd_flex = LEX $@
177 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
179 .PRECIOUS: $(src)/%.lex.c_shipped
180 $(src)/%.lex.c_shipped: $(src)/%.l
184 # ---------------------------------------------------------------------------
185 YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
187 quiet_cmd_bison = YACC $@
188 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
190 .PRECIOUS: $(src)/%.tab.c_shipped
191 $(src)/%.tab.c_shipped: $(src)/%.y
194 quiet_cmd_bison_h = YACC $@
195 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
197 .PRECIOUS: $(src)/%.tab.h_shipped
198 $(src)/%.tab.h_shipped: $(src)/%.y
204 # ===========================================================================
206 quiet_cmd_shipped = SHIPPED $@
207 cmd_shipped = cat $< > $@
209 $(obj)/%: $(src)/%_shipped
212 # Commands useful for building a boot image
213 # ===========================================================================
217 # target: source(s) FORCE
218 # $(if_changed,ld/objcopy/gzip)
220 # and add target to extra-y so that we know we have to
221 # read in the saved command line
224 # ---------------------------------------------------------------------------
227 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
228 $(filter-out FORCE,$^) -o $@
231 # ---------------------------------------------------------------------------
233 quiet_cmd_objcopy = OBJCOPY $@
234 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
237 # ---------------------------------------------------------------------------
239 quiet_cmd_gzip = GZIP $@
240 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
244 # ---------------------------------------------------------------------------
246 # Generate an assembly file to wrap the output of the device tree compiler
247 quiet_cmd_dt_S_dtb= DTB $@
250 echo '\#include <asm-generic/vmlinux.lds.h>'; \
251 echo '.section .dtb.init.rodata,"a"'; \
252 echo '.balign STRUCT_ALIGNMENT'; \
253 echo '.global __dtb_$(*F)_begin'; \
254 echo '__dtb_$(*F)_begin:'; \
255 echo '.incbin "$<" '; \
256 echo '__dtb_$(*F)_end:'; \
257 echo '.global __dtb_$(*F)_end'; \
258 echo '.balign STRUCT_ALIGNMENT'; \
261 $(obj)/%.dtb.S: $(obj)/%.dtb
264 quiet_cmd_dtc = DTC $@
265 cmd_dtc = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
266 $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 \
267 -i $(srctree)/arch/$(SRCARCH)/boot/dts $(DTC_FLAGS) \
268 -d $(depfile).dtc $(dtc-tmp) ; \
269 cat $(depfile).pre $(depfile).dtc > $(depfile)
271 $(obj)/%.dtb: $(src)/%.dts FORCE
272 $(call if_changed_dep,dtc)
274 dtc-tmp = $(subst $(comma),_,$(dot-target).dts)
277 # ---------------------------------------------------------------------------
279 # Bzip2 and LZMA do not include size in file... so we have to fake that;
280 # append the size as a 32-bit littleendian number as gzip does.
281 size_append = printf $(shell \
284 fsize=$$(stat -c "%s" $$F); \
285 dec_size=$$(expr $$dec_size + $$fsize); \
287 printf "%08x\n" $$dec_size | \
288 sed 's/\(..\)/\1 /g' | { \
289 read ch0 ch1 ch2 ch3; \
290 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
291 printf '%s%03o' '\\' $$((0x$$ch)); \
296 quiet_cmd_bzip2 = BZIP2 $@
297 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
298 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
302 # ---------------------------------------------------------------------------
304 quiet_cmd_lzma = LZMA $@
305 cmd_lzma = (cat $(filter-out FORCE,$^) | \
306 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
309 quiet_cmd_lzo = LZO $@
310 cmd_lzo = (cat $(filter-out FORCE,$^) | \
311 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
315 # ---------------------------------------------------------------------------
317 MKIMAGE := $(srctree)/scripts/mkuboot.sh
319 # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
320 # the number of overrides in arch makefiles
321 UIMAGE_ARCH ?= $(SRCARCH)
322 UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
324 UIMAGE_TYPE ?= kernel
325 UIMAGE_LOADADDR ?= arch_must_set_this
326 UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
327 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
331 quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
332 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
333 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
335 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
336 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
339 # ---------------------------------------------------------------------------
340 # Use xzkern to compress the kernel image and xzmisc to compress other things.
342 # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
343 # of the kernel decompressor. A BCJ filter is used if it is available for
344 # the target architecture. xzkern also appends uncompressed size of the data
345 # using size_append. The .xz format has the size information available at
346 # the end of the file too, but it's in more complex format and it's good to
347 # avoid changing the part of the boot code that reads the uncompressed size.
348 # Note that the bytes added by size_append will make the xz tool think that
349 # the file is corrupt. This is expected.
351 # xzmisc doesn't use size_append, so it can be used to create normal .xz
352 # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
353 # big dictionary would increase the memory usage too much in the multi-call
354 # decompression mode. A BCJ filter isn't used either.
355 quiet_cmd_xzkern = XZKERN $@
356 cmd_xzkern = (cat $(filter-out FORCE,$^) | \
357 sh $(srctree)/scripts/xz_wrap.sh && \
358 $(call size_append, $(filter-out FORCE,$^))) > $@ || \
361 quiet_cmd_xzmisc = XZMISC $@
362 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
363 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
367 # ---------------------------------------------------------------------------