# Backward compatibility

asflags-y += $(EXTRA_AFLAGS)

ccflags-y += $(EXTRA_CFLAGS)

cppflags-y += $(EXTRA_CPPFLAGS)

ldflags-y += $(EXTRA_LDFLAGS)

#

# flags that take effect in sub directories

export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)

export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)

# Figure out what we need to build from the various variables

# ===========================================================================

# When an object is listed to be built compiled-in and modular,

# only build the compiled-in version

obj-m := $(filter-out $(obj-y),$(obj-m))

# Libraries are always collected in one lib file.

# Filter out objects already built-in

lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))

# Handle objects in subdirs

# ---------------------------------------------------------------------------

# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o

# and add the directory to the list of dirs to descend into: $(subdir-y)

# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)

# and add the directory to the list of dirs to descend into: $(subdir-m)

# Determine modorder.

# Unfortunately, we don't have information about ordering between -y

# and -m subdirs. Just put -y's first.

modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))

__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))

subdir-y += $(__subdir-y)

__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))

subdir-m += $(__subdir-m)

obj-y := $(patsubst %/, %/built-in.o, $(obj-y))

obj-m := $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into

subdir-ym := $(sort $(subdir-y) $(subdir-m))

# if $(foo-objs) exists, foo.o is a composite object

multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))

multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))

multi-used := $(multi-used-y) $(multi-used-m)

single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))

# Build list of the parts of our composite objects, our composite

# objects depend on those (obviously)

multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))

multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))

multi-objs := $(multi-objs-y) $(multi-objs-m)

# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to

# tell kbuild to descend

subdir-obj-y := $(filter %/built-in.o, $(obj-y))

# $(obj-dirs) is a list of directories that contain object files

obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))

# Replace multi-part objects by their individual parts, look at local dir only

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)

real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))

# Add subdir path

extra-y := $(addprefix $(obj)/,$(extra-y))

always := $(addprefix $(obj)/,$(always))

targets := $(addprefix $(obj)/,$(targets))

modorder := $(addprefix $(obj)/,$(modorder))

obj-y := $(addprefix $(obj)/,$(obj-y))

obj-m := $(addprefix $(obj)/,$(obj-m))

lib-y := $(addprefix $(obj)/,$(lib-y))

subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))

real-objs-y := $(addprefix $(obj)/,$(real-objs-y))

real-objs-m := $(addprefix $(obj)/,$(real-objs-m))

single-used-m := $(addprefix $(obj)/,$(single-used-m))

multi-used-y := $(addprefix $(obj)/,$(multi-used-y))

multi-used-m := $(addprefix $(obj)/,$(multi-used-m))

multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))

multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))

subdir-ym := $(addprefix $(obj)/,$(subdir-ym))

obj-dirs := $(addprefix $(obj)/,$(obj-dirs))

# These flags are needed for modversions and compiling, so we define them here

# already

# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will

# end up in (or would, if it gets compiled in)

# Note: Files that end up in two or more modules are compiled without the

# KBUILD_MODNAME definition. The reason is that any made-up name would

# differ in different configs.

name-fix = $(subst $(comma),_,$(subst -,_,$1))

basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"

modname_flags = $(if $(filter 1,$(words $(modname))),\

-D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")

orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \

$(ccflags-y) $(CFLAGS_$(basetarget).o)

_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))

_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \

$(asflags-y) $(AFLAGS_$(basetarget).o)

_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))

#

# Enable gcov profiling flags for a file, directory or for all files depending

# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL

# (in this order)

#

ifeq ($(CONFIG_GCOV_KERNEL),y)

_c_flags += $(if $(patsubst n%,, \

$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \

$(CFLAGS_GCOV))

endif

ifdef CONFIG_SYMBOL_PREFIX

_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))

_cpp_flags += $(_sym_flags)

_a_flags += $(_sym_flags)

endif

# If building the kernel in a separate objtree expand all occurrences

# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').

ifeq ($(KBUILD_SRC),)

__c_flags = $(_c_flags)

__a_flags = $(_a_flags)

__cpp_flags = $(_cpp_flags)

else

# -I$(obj) locates generated .h files

# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files

# and locates generated .h files

# FIXME: Replace both with specific CFLAGS* statements in the makefiles

__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)

__a_flags = $(call flags,_a_flags)

__cpp_flags = $(call flags,_cpp_flags)

endif

c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

$(__c_flags) $(modkern_cflags) \

-D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)

a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

$(__a_flags) $(modkern_aflags)

cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

$(__cpp_flags)

ld_flags = $(LDFLAGS) $(ldflags-y)

# Finds the multi-part object the current object will be linked into

modname-multi = $(sort $(foreach m,$(multi-used),\

$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))

ifdef REGENERATE_PARSERS

# GPERF

# ---------------------------------------------------------------------------

quiet_cmd_gperf = GPERF $@

cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<

.PRECIOUS: $(src)/%.hash.c_shipped

$(src)/%.hash.c_shipped: $(src)/%.gperf

$(call cmd,gperf)

# LEX

# ---------------------------------------------------------------------------

LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)

quiet_cmd_flex = LEX $@

cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<

.PRECIOUS: $(src)/%.lex.c_shipped

$(src)/%.lex.c_shipped: $(src)/%.l

$(call cmd,flex)

# YACC

# ---------------------------------------------------------------------------

YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)

quiet_cmd_bison = YACC $@

cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<

.PRECIOUS: $(src)/%.tab.c_shipped

$(src)/%.tab.c_shipped: $(src)/%.y

$(call cmd,bison)

quiet_cmd_bison_h = YACC $@

cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<

.PRECIOUS: $(src)/%.tab.h_shipped

$(src)/%.tab.h_shipped: $(src)/%.y

$(call cmd,bison_h)

endif

# Shipped files

# ===========================================================================

quiet_cmd_shipped = SHIPPED $@

cmd_shipped = cat $< > $@

$(obj)/%: $(src)/%_shipped

$(call cmd,shipped)

# Commands useful for building a boot image

# ===========================================================================

#

# Use as following:

#

# target: source(s) FORCE

# $(if_changed,ld/objcopy/gzip)

#

# and add target to extra-y so that we know we have to

# read in the saved command line

# Linking

# ---------------------------------------------------------------------------

quiet_cmd_ld = LD $@

cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \

$(filter-out FORCE,$^) -o $@

# Objcopy

# ---------------------------------------------------------------------------

quiet_cmd_objcopy = OBJCOPY $@

cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

# Gzip

# ---------------------------------------------------------------------------

quiet_cmd_gzip = GZIP $@

cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \

(rm -f $@ ; false)

# DTC

# ---------------------------------------------------------------------------

# Generate an assembly file to wrap the output of the device tree compiler

quiet_cmd_dt_S_dtb= DTB $@

cmd_dt_S_dtb= \

( \

echo '\#include <asm-generic/vmlinux.lds.h>'; \

echo '.section .dtb.init.rodata,"a"'; \

echo '.balign STRUCT_ALIGNMENT'; \

echo '.global __dtb_$(*F)_begin'; \

echo '__dtb_$(*F)_begin:'; \

echo '.incbin "$<" '; \

echo '__dtb_$(*F)_end:'; \

echo '.global __dtb_$(*F)_end'; \

echo '.balign STRUCT_ALIGNMENT'; \

) > $@

$(obj)/%.dtb.S: $(obj)/%.dtb

$(call cmd,dt_S_dtb)

quiet_cmd_dtc = DTC $@

cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<

# cat

# ---------------------------------------------------------------------------

# Concatentate multiple files together

quiet_cmd_cat = CAT $@

cmd_cat = (cat $(filter-out FORCE,$^) > $@) || (rm -f $@; false)

# Bzip2

# ---------------------------------------------------------------------------

# Bzip2 and LZMA do not include size in file... so we have to fake that;

# append the size as a 32-bit littleendian number as gzip does.

size_append = printf $(shell \

dec_size=0; \

for F in $1; do \

fsize=$$(stat -c "%s" $$F); \

dec_size=$$(expr $$dec_size + $$fsize); \

done; \

printf "%08x\n" $$dec_size | \

sed 's/\(..\)/\1 /g' | { \

read ch0 ch1 ch2 ch3; \

for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \

printf '%s%03o' '\\' $$((0x$$ch)); \

done; \

} \

)

quiet_cmd_bzip2 = BZIP2 $@

cmd_bzip2 = (cat $(filter-out FORCE,$^) | \

bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \

(rm -f $@ ; false)

# Lzma

# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA $@

cmd_lzma = (cat $(filter-out FORCE,$^) | \

lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \

(rm -f $@ ; false)

quiet_cmd_lzo = LZO $@

cmd_lzo = (cat $(filter-out FORCE,$^) | \

lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \

(rm -f $@ ; false)

# U-Boot mkimage

# ---------------------------------------------------------------------------

MKIMAGE := $(srctree)/scripts/mkuboot.sh

# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces

# the number of overrides in arch makefiles

UIMAGE_ARCH ?= $(SRCARCH)

UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)

UIMAGE_OPTS-y ?=

UIMAGE_TYPE ?= kernel

UIMAGE_LOADADDR ?= arch_must_set_this

UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)

UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'

UIMAGE_IN ?= $<

UIMAGE_OUT ?= $@

quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)

cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \

-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \

-T $(UIMAGE_TYPE) \

-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \

-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)

# XZ

# ---------------------------------------------------------------------------

# Use xzkern to compress the kernel image and xzmisc to compress other things.

#

# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage

# of the kernel decompressor. A BCJ filter is used if it is available for

# the target architecture. xzkern also appends uncompressed size of the data

# using size_append. The .xz format has the size information available at

# the end of the file too, but it's in more complex format and it's good to

# avoid changing the part of the boot code that reads the uncompressed size.

# Note that the bytes added by size_append will make the xz tool think that

# the file is corrupt. This is expected.

#

# xzmisc doesn't use size_append, so it can be used to create normal .xz

# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very

# big dictionary would increase the memory usage too much in the multi-call

# decompression mode. A BCJ filter isn't used either.

quiet_cmd_xzkern = XZKERN $@

cmd_xzkern = (cat $(filter-out FORCE,$^) | \

sh $(srctree)/scripts/xz_wrap.sh && \

$(call size_append, $(filter-out FORCE,$^))) > $@ || \

(rm -f $@ ; false)

quiet_cmd_xzmisc = XZMISC $@

cmd_xzmisc = (cat $(filter-out FORCE,$^) | \

xz --check=crc32 --lzma2=dict=1MiB) > $@ || \

(rm -f $@ ; false)

# misc stuff

# ---------------------------------------------------------------------------

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