1. 根目录:
2. scripts
3. Makefile

###
# scripts contains sources for various helper programs used throughout
# the kernel for the build process.
# ---------------------------------------------------------------------------
# kallsyms:      Find all symbols in vmlinux
# pnmttologo:    Convert pnm files to logo files
# conmakehash:   Create chartable
# conmakehash:	 Create arrays for initializing the kernel console tables
# docproc:       Used in Documentation/DocBook

HOST_EXTRACFLAGS += -I$(srctree)/tools/include

hostprogs-$(CONFIG_KALLSYMS)     += kallsyms
hostprogs-$(CONFIG_LOGO)         += pnmtologo
hostprogs-$(CONFIG_VT)           += conmakehash
hostprogs-$(CONFIG_IKCONFIG)     += bin2c
hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable
hostprogs-$(CONFIG_ASN1)	 += asn1_compiler

HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include
HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include

always		:= $(hostprogs-y) $(hostprogs-m)

# The following hostprogs-y programs are only build on demand
hostprogs-y += unifdef docproc

# These targets are used internally to avoid "is up to date" messages
PHONY += build_unifdef
build_unifdef: scripts/unifdef FORCE
	@:
build_docproc: scripts/docproc FORCE
	@:

subdir-$(CONFIG_MODVERSIONS) += genksyms
subdir-y                     += mod
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_DTC)         += dtc

# Let clean descend into subdirs
subdir-	+= basic kconfig package selinux