代码拉取完成，页面将自动刷新
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确定后同步将在后台操作，完成时将刷新页面，请耐心等待。
VERSION = 0
PATCHLEVEL = 96
SUBLEVEL = 0
EXTRAVERSION = .0
NAME = photon-rtos
#不要再屏幕上打印"Entering directory.."
MAKEFLAGS += -rR --no-print-directory
#如果命令行指定了“V”参数，表示需要输出详细信息
ifeq ("$(origin V)", "command line")
KBUILD_VERBOSE = $(V)
endif
ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0
endif
# 源代码检查
#
# 使用'make C=1'，仅仅检查重新编译的文件。
# 使用'make C=2'，将对'所有'源文件进行检查，而不管是否重新编译它。
ifeq ("$(origin C)", "command line")
KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
KBUILD_CHECKSRC = 0
endif
srctree := $(CURDIR)
objtree := $(CURDIR)
export srctree objtree
# 如果没有指定编译目标，那么默认就是_all
PHONY := all
# 交叉编译使用不同的gcc/bin-utils集合
# ---------------------------------------------------------------------------
#
# 当执行交叉编译时，应当指定ARCH参数为目标体系结构。
# ARCH可以象如下命令一样指定：
# make ARCH=ia64
# 另一种方式是指定ARCH环境变量。默认ARCH是make执行时的主机体系结构。
# CROSS_COMPILE指定了交叉编译时的前缀。仅仅只有gcc和相关的bin-utils执行时，
# 才使用$(CROSS_COMPILE)作为前缀。
# CROSS_COMPILE可以在命令行指定，如：
# make CROSS_COMPILE=ia64-photon-
# 可选的，可以在环境变量中指定CROSS_COMPILE。
# 第三种方法是在.config中保存交叉编译的设置。
export KBUILD_BUILDHOST := $(shell uname -m)
ARCH ?= arm
CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
# 写入到compile.h
SRCARCH := $(ARCH)
KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
# 使用的shell
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
else if [ -x /bin/bash ]; then echo /bin/bash; \
else echo sh; fi ; fi)
#
# 主机上的编译工具
#
HOSTCC = gcc
HOSTCXX = g++
HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
HOSTCXXFLAGS = -O2
#
# 是否编译模块.
#
KBUILD_MODULES :=
KBUILD_BUILTIN := 1
export KBUILD_BUILTIN KBUILD_MODULES
export KBUILD_CHECKSRC
# 修饰输出格式
# ---------------------------------------------------------------------------
#
# 一般情况下，在执行命令前，我们回显完整的命令
# 可以设置$(quiet)来选择其他的输出格式。
#
# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
#
# 如果$(quiet)为空，整个命令会被打印出来
# 如果设置为"quiet_", 仅仅打印短版本
# 如果设置为"silent_", 什么都不会被打印，因为$(silent_cmd_cc_o_c)根本不存在。
#
# 在non-verbose模式下，在命令前面的简单变量$(Q)，将隐藏执行的命令
#
# $(Q)ln $@ :<
#
# 如果KBUILD_VERBOSE等于0，上面的命令将被隐藏
# 如果KBUILD_VERBOSE等于1，那么上面的命令将被显示出来
ifeq ($(KBUILD_VERBOSE),1)
quiet =
Q =
else
quiet=quiet_
Q = @
endif
# 如果用户运行make -s，则不回显命令
ifneq ($(findstring s,$(MAKEFLAGS)),)
quiet=silent_
endif
export quiet Q KBUILD_VERBOSE
# 将源代码根目录添加到include路径。
MAKEFLAGS += ---dir=$(srctree)
# 一些通常的定义
$(srctree)/scripts/Kbuild.include: ;
include $(srctree)/scripts/Kbuild.include
# Make变量，如CC...
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
OBJDUMP = $(CROSS_COMPILE)objdump
AWK = awk
GENKSYMS = scripts/genksyms/genksyms
KALLSYMS = scripts/kallsyms
PERL = perl
CHECK = sparse
CHECKFLAGS := -D__photon__ -Dphoton -D__STDC__ \
-Wbitwise -Wno-return-void $(CF)
CFLAGS_KERNEL =
AFLAGS_KERNEL =
#
# 包含文件路径
#
USERINCLUDE := \
-I$(srctree)/arch/$(ARCH)/include/uapi \
-Iarch/$(ARCH)/include/generated/uapi \
-I$(srctree)/arch/$(ARCH)/include/uapi \
-I$(srctree)/include/uapi \
-Iinclude/generated/uapi \
KLIBCINCLUDE := \
-include include/generated/autoconf.h \
-I$(srctree)/arch/$(ARCH)/include/uapi \
-Iarch/$(ARCH)/include/generated/uapi \
-I$(srctree)/arch/$(ARCH)/include/uapi
PHOTONINCLUDE := -I$(srctree)/arch/$(ARCH)/include -Iinclude \
$(if $(KBUILD_SRC), -I$(srctree)/include) \
-Iarch/$(ARCH)/include/generated \
-Iarch/$(ARCH)/include/generated/uapi \
-include include/generated/autoconf.h \
-Iarch/$(ARCH)/include/generated/ \
-Iinclude/asm-generic/ \
-Iinclude/generated/ \
-Iusr/include/asm-generic/ \
-Iinclude \
$(USERINCLUDE)
KBUILD_CPPFLAGS := -D__KERNEL__
KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wno-unused-function \
-fno-strict-aliasing -fno-common \
-Wno-format-security \
-Wno-main \
-fno-delete-null-pointer-checks \
-fno-tree-scev-cprop -Wmissing-declarations -Wmissing-prototypes
KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL := -fno-tree-scev-cprop
KBUILD_AFLAGS := -D__ASSEMBLY__
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
#
# 从include/config/kernel.release中读取值到KERNELRELEASE变量中
#
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM STRIP OBJCOPY OBJDUMP
export MAKE AWK GENKSYMS PERL
export HOSTCXX HOSTCXXFLAGS CHECK CHECKFLAGS
export KBUILD_CPPFLAGS NOSTDINC_FLAGS KLIBCINCLUDE PHOTONINCLUDE OBJCOPYFLAGS LDFLAGS
export KBUILD_CFLAGS CFLAGS_KERNEL
export KBUILD_AFLAGS AFLAGS_KERNEL
export KBUILD_LDFLAGS_MODULE
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
#
# 在查找时，忽略这些文件
# 这些文件不会被清除，也不会参与编译
#
RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
# ===========================================================================
# 用于*config配置文件的规则
# scripts/目录下的辅助目标
PHONY += scripts_basic
scripts_basic:
make -f scripts/Makefile.build obj=scripts/basic
$(Q)$(MAKE) $(build)=scripts/basic
$(Q)rm -f .tmp_quiet_recordmcount
#
# 隐含的空命令
#
scripts/basic/%: scripts_basic ;
# 在这些目标中，不能包含.config
no-dot-config-targets := clean mrproper distclean \
cscope TAGS tags %docs check% coccicheck \
headers_% \
kernelversion %src-pkg
config-targets := 0
mixed-targets := 0
dot-config := 1
ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
dot-config := 0
endif
endif
ifneq ($(filter config %config,$(MAKECMDGOALS)),)
config-targets := 1
ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
mixed-targets := 1
endif
endif
ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.
%:: FORCE
$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
else
ifeq ($(config-targets),1)
# ===========================================================================
# 仅仅是构建*config目标
# 读取体系特定的Makefile以设置KBUILD_DEFCONFIG
# 使用defconfig可以为KBUILD_DEFCONFIG指定默认的配置
include $(srctree)/arch/$(ARCH)/Makefile
export KBUILD_DEFCONFIG KBUILD_KCONFIG
config: scripts_basic FORCE
$(Q)mkdir -p include/config
$(Q)$(MAKE) $(build)=scripts/kconfig $@
#@mkdir -p include/chsuhi include/config
#@make -f scripts/Makefile.build obj=scripts/kconfig menuconfig
%config: scripts_basic FORCE
$(Q)mkdir -p include/config
$(Q)$(MAKE) $(build)=scripts/kconfig $@
else
# ===========================================================================
# 仅仅构建目标-包含photon, 体系特定目标, clean及其他
PHONY += scripts
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
$(Q)$(MAKE) $(build)=$(@)
# 链接到photon中的子目录
init-y := init/
libs-y := lib/
core-y := kernel/
apps-y := apps/
# 构建目标需要引用配置文件
ifeq ($(dot-config),1)
# Read in config
-include include/config/auto.conf
# 配置文件
-include include/config/auto.conf.cmd
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
#
# .config文件比auto.conf新，执行silentoldconfig生成auto.conf
#
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
else
include/config/auto.conf: ;
endif # $(dot-config)
# 默认的构建目标，在体系特定的Makefile中，一般还会添加其他目标到all中
all: photon
KBUILD_CFLAGS += -DCONFIG_OSEK=y
#
# CONFIG_CC_OPTIMIZE_FOR_SIZE在auto.conf中被添加进来了
#
ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS += -O0
else
KBUILD_CFLAGS += -O0
endif
# 添加体系结构特定的Makefile
include $(srctree)/arch/$(ARCH)/Makefile
#
# 用户配置了栈帧告警
# 调整编译参数
#
ifneq ($(CONFIG_FRAME_WARN),0)
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif
#
# 用户配置了堆栈保护
# 调整编译参数
#
ifndef CONFIG_CC_STACKPROTECTOR
KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
endif
#
# 用户配置了栈帧参数
# 调整编译参数，确保生成栈帧，简化堆栈打印
#
ifdef CONFIG_FRAME_POINTER
KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
else
KBUILD_CFLAGS += -fomit-frame-pointer
endif
ifdef CONFIG_IOC
KBUILD_CFLAGS += -Iapps/UnitTest
endif
# arch Makefile may override CC so keep this after arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS += $(NOSTDINC_FLAGS)
# warn about C99 declaration after statement
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
# disable pointer signed / unsigned warnings in gcc 4.0
KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
# 将用户定义的CPPFLAGS，AFLAGS，CFLAGS添加到编译选项中
# 但是在添加前向用户提示警告信息
warn-assign = \
$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
ifneq ($(KCPPFLAGS),)
$(call warn-assign,CPPFLAGS)
KBUILD_CPPFLAGS += $(KCPPFLAGS)
endif
ifneq ($(KAFLAGS),)
$(call warn-assign,AFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
endif
ifneq ($(KCFLAGS),)
$(call warn-assign,CFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)
endif
# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
$(call cc-ldoption, -Wl$(comma)--build-id,))
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_photon += $(LDFLAGS_BUILD_ID)
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
LDFLAGS_photon += $(call ld-option, -X,)
endif
# 如果没有指定内核映像名称，就使用默认的photon
# KBUILD_IMAGE可以被命令行或者环境变量覆盖
# 也可以在arch/$(ARCH)/Makefile中设置此值
export KBUILD_IMAGE ?= photon
#
# INSTALL_PATH指定放置内核和map文件的默认位置
# 默认值是/boot
export INSTALL_PATH ?= /boot
#
# INSTALL_MOD_PATH指定MODLIB的前缀。
# 在Makefile中没有指定其值，但是可以指定环境变量。
#
MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
export MODLIB
#
# 去除模块中的符号
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
mod_strip_cmd = $(STRIP) --strip-debug
else
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
endif # INSTALL_MOD_STRIP=1
else
mod_strip_cmd = true
endif # INSTALL_MOD_STRIP
export mod_strip_cmd
# 要编译的核心目录文件
core-y += autosar/
# photon需要编译的目录
photon-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
$(core-y) $(core-m) \
$(libs-y) $(libs-m) \
$(apps-y) $(apps-m)))
photon-alldirs := $(sort $(photon-dirs) $(patsubst %/,%,$(filter %/, \
$(init-n) $(init-) \
$(core-n) $(core-) \
$(libs-n) $(libs-) $(apps-n) $(apps-))))
init-y := $(patsubst %/, %/built-in.o, $(init-y))
core-y := $(patsubst %/, %/built-in.o, $(core-y))
libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
libs-y := $(libs-y1) $(libs-y2)
apps-y := $(patsubst %/, %/built-in.o, $(apps-y))
# 构建photon
# ---------------------------------------------------------------------------
# photon is built from the objects selected by $(photon-init) and
# $(photon-main). Most are built-in.o files from top-level directories
# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
# Ordering when linking is important, and $(photon-init) must be first.
#
# photon
# ^
# |
# +-< $(photon-init)
# | +--< init/version.o + more
# |
# +--< $(photon-main)
# | +--< driver/built-in.o mm/built-in.o + more
# |
# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
#
# photon version (uname -v) cannot be updated during normal
# descending-into-subdirs phase since we do not yet know if we need to
# update photon.
# Therefore this step is delayed until just before final link of photon -
# except in the kallsyms case where it is done just before adding the
# symbols to the kernel.
#
# System.map is generated to document addresses of all kernel symbols
photon-init := $(head-y) $(init-y)
photon-main := $(core-y) $(libs-y) $(apps-y)
photon-all := $(photon-init) $(photon-main)
photon-lds := arch/$(ARCH)/kernel/photon.lds
export KBUILD_photon_OBJS := $(photon-all)
# Rule to link photon - also used during CONFIG_KALLSYMS
# May be overridden by arch/$(ARCH)/Makefile
quiet_cmd_photon__ ?= LD $@
cmd_photon__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_photon) -o $@ \
-T $(photon-lds) $(photon-init) \
--start-group $(photon-main) --end-group \
$(filter-out $(photon-lds) $(photon-init) $(photon-main) photon.o FORCE ,$^)
# 生成photon版本号
quiet_cmd_photon_version = GEN .version
cmd_photon_version = set -e; \
if [ ! -r .version ]; then \
rm -f .version; \
echo 1 >.version; \
else \
mv .version .old_version; \
expr 0$$(cat .old_version) + 1 >.version; \
fi; \
$(MAKE) $(build)=init
# 生成System.map
quiet_cmd_sysmap = SYSMAP
cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
# Link of photon
# If CONFIG_KALLSYMS is set .version is already updated
# Generate System.map and verify that the content is consistent
# Use + in front of the photon_version rule to silent warning with make -j2
# First command is ':' to allow us to use + in front of the rule
define rule_photon__
:
$(if $(CONFIG_KALLSYMS),,+$(call cmd,photon_version))
$(call cmd,photon__)
$(Q)echo 'cmd_$@ := $(cmd_photon__)' > $(@D)/.$(@F).cmd
$(Q)$(if $($(quiet)cmd_sysmap), \
echo ' $($(quiet)cmd_sysmap) System.map' &&) \
$(cmd_sysmap) $@ System.map; \
if [ $$? -ne 0 ]; then \
rm -f $@; \
/bin/false; \
fi;
$(verify_kallsyms)
endef
ifdef CONFIG_KALLSYMS
# Generate section listing all symbols and add it into photon $(kallsyms.o)
# It's a three stage process:
# o .tmp_photon1 has all symbols and sections, but __kallsyms is
# empty
# Running kallsyms on that gives us .tmp_kallsyms1.o with
# the right size - photon version (uname -v) is updated during this step
# o .tmp_photon2 now has a __kallsyms section of the right size,
# but due to the added section, some addresses have shifted.
# From here, we generate a correct .tmp_kallsyms2.o
# o The correct .tmp_kallsyms2.o is linked into the final photon.
# o Verify that the System.map from photon matches the map from
# .tmp_photon2, just in case we did not generate kallsyms correctly.
# o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
# .tmp_photon3 and .tmp_kallsyms3.o. This is only meant as a
# temporary bypass to allow the kernel to be built while the
# maintainers work out what went wrong with kallsyms.
ifdef CONFIG_KALLSYMS_EXTRA_PASS
last_kallsyms := 3
else
last_kallsyms := 2
endif
kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
define verify_kallsyms
$(Q)$(if $($(quiet)cmd_sysmap), \
echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
$(cmd_sysmap) .tmp_photon$(last_kallsyms) .tmp_System.map
$(Q)cmp -s System.map .tmp_System.map || \
(echo Inconsistent kallsyms data; \
echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
rm .tmp_kallsyms* ; /bin/true )
endef
# Update photon version before link
# Use + in front of this rule to silent warning about make -j1
# First command is ':' to allow us to use + in front of this rule
cmd_ksym_ld = $(cmd_photon__)
define rule_ksym_ld
:
+$(call cmd,photon_version)
$(call cmd,photon__)
$(Q)echo 'cmd_$@ := $(cmd_photon__)' > $(@D)/.$(@F).cmd
endef
# Generate .S file with all kernel symbols
quiet_cmd_kallsyms = KSYM $@
cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
$(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
$(call if_changed_dep,as_o_S)
.tmp_kallsyms%.S: .tmp_photon% $(KALLSYMS)
$(call cmd,kallsyms)
# .tmp_photon1 must be complete except kallsyms, so update photon version
.tmp_photon1: $(photon-lds) $(photon-all) FORCE
$(call if_changed_rule,ksym_ld)
.tmp_photon2: $(photon-lds) $(photon-all) .tmp_kallsyms1.o FORCE
$(call if_changed,photon__)
.tmp_photon3: $(photon-lds) $(photon-all) .tmp_kallsyms2.o FORCE
$(call if_changed,photon__)
# Needs to visit scripts/ before $(KALLSYMS) can be used.
$(KALLSYMS): scripts ;
# Generate some data for debugging strange kallsyms problems
debug_kallsyms: .tmp_map$(last_kallsyms)
.tmp_map%: .tmp_photon% FORCE
($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
.tmp_map3: .tmp_map2
.tmp_map2: .tmp_map1
endif # ifdef CONFIG_KALLSYMS
# Do modpost on a prelinked photon. The finally linked photon has
# relevant sections renamed as per the linker script.
quiet_cmd_photon-modpost = LD $@
cmd_photon-modpost = $(LD) $(LDFLAGS) -r -o $@ \
$(photon-init) --start-group $(photon-main) --end-group \
$(filter-out $(photon-init) $(photon-main) FORCE ,$^)
define rule_photon-modpost
:
+$(call cmd,photon-modpost)
endef
# photon image - including updated kernel symbols
photon: $(photon-lds) $(photon-init) $(photon-main) photon.o $(kallsyms.o) FORCE
ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
$(call photon-modpost)
$(call if_changed_rule,photon__)
$(Q)rm -f .old_version
# build photon.o first to catch section mismatch errors early
ifdef CONFIG_KALLSYMS
.tmp_photon1: photon.o
endif
modpost-init := $(filter-out init/built-in.o, $(photon-init))
photon.o: $(modpost-init) $(photon-main) FORCE
$(call if_changed_rule,photon-modpost)
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(photon-init) $(photon-main)) $(photon-lds): $(photon-dirs) ;
# Handle descending into subdirectories listed in $(photon-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language
PHONY += $(photon-dirs)
$(photon-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@
# Store (new) KERNELRELASE string in include/config/kernel.release
include/config/kernel.release: include/config/auto.conf FORCE
$(Q)rm -f $@
$(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
# Things we need to do before we recursively start building the kernel
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
# Listed in dependency order
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
# prepare3 is used to check if we are building in a separate output directory,
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
prepare3: include/config/kernel.release
ifneq ($(KBUILD_SRC),)
@$(kecho) ' Using $(srctree) as source for kernel'
$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
echo " $(srctree) is not clean, please run 'make mrproper'";\
echo " in the '$(srctree)' directory.";\
/bin/false; \
fi;
endif
# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3
prepare1: prepare2 include/generated/utsrelease.h \
include/config/auto.conf
archprepare: prepare1 scripts_basic
prepare0: archprepare FORCE
$(Q)$(MAKE) $(build)=.
$(Q)$(MAKE) $(build)=. missing-syscalls
# All the preparing..
prepare: prepare0
# Generate some files
# ---------------------------------------------------------------------------
# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds
uts_len := 64
define filechk_utsrelease.h
if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
exit 1; \
fi; \
(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
endef
define filechk_version.h
(echo \#define PHOTON_VERSION_CODE $(shell \
expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
endef
include/generated/utsrelease.h: include/config/kernel.release FORCE
$(call filechk,utsrelease.h)
PHONY += headerdep
headerdep:
$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
# ---------------------------------------------------------------------------
PHONY += depend dep
depend dep:
@echo '*** Warning: make $@ is unnecessary now.'
# ---------------------------------------------------------------------------
# Firmware install
INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
export INSTALL_FW_PATH
PHONY += firmware_install
firmware_install: FORCE
@mkdir -p $(objtree)/firmware
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
# ---------------------------------------------------------------------------
# Kernel headers
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
# If we do an all arch process set dst to asm-$(ARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(ARCH), dst=include/asm)
PHONY += __headers
__headers: scripts_basic FORCE
$(Q)$(MAKE) $(build)=scripts scripts/unifdef
PHONY += headers_install_all
headers_install_all:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
PHONY += headers_install
headers_install: __headers
$(if $(wildcard $(srctree)/arch/$(ARCH)/include/asm/Kbuild),, \
$(error Headers not exportable for the $(ARCH) architecture))
$(Q)$(MAKE) $(hdr-inst)=include
$(Q)$(MAKE) $(hdr-inst)=arch/$(ARCH)/include/asm $(hdr-dst)
PHONY += headers_check_all
headers_check_all: headers_install_all
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
PHONY += headers_check
headers_check: headers_install
$(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
$(Q)$(MAKE) $(hdr-inst)=arch/$(ARCH)/include/asm $(hdr-dst) HDRCHECK=1
#
# 编译时要清除的文件
#
CLEAN_FILES += photon System.map \
.tmp_kallsyms* .tmp_version .tmp_photon* .tmp_System.map
# Directories & files removed with 'make mrproper'
MRPROPER_DIRS += include/config include/generated
MRPROPER_FILES += .config .config.old .version .old_version \
Module.symvers tags TAGS cscope*
# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
clean-dirs := $(addprefix _clean_,$(srctree) $(photon-alldirs))
PHONY += $(clean-dirs) clean archclean
$(clean-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
clean: archclean $(clean-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
@find . $(RCS_FIND_IGNORE) \
\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.symtypes' -o -name 'modules.order' \
-o -name modules.builtin -o -name '.tmp_*.o.*' \
-o -name '*.gcno' \) -type f -print | xargs rm -f
# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs := $(addprefix _mrproper_,)
PHONY += $(mrproper-dirs) mrproper archmrproper
$(mrproper-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
mrproper: clean archmrproper $(mrproper-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
# distclean
#
PHONY += distclean
distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
-o -name '.*.rej' \
-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
-type f -print | xargs rm -f
# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
# rpm target kept for backward compatibility
package-dir := $(srctree)/scripts/package
%src-pkg: FORCE
$(Q)$(MAKE) $(build)=$(package-dir) $@
%pkg: include/config/kernel.release FORCE
$(Q)$(MAKE) $(build)=$(package-dir) $@
rpm: include/config/kernel.release FORCE
$(Q)$(MAKE) $(build)=$(package-dir) $@
# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------
# Documentation targets
# ---------------------------------------------------------------------------
%docs: scripts_basic FORCE
$(Q)$(MAKE) $(build)=$@
# Generate tags for editors
# ---------------------------------------------------------------------------
quiet_cmd_tags = GEN $@
cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
tags TAGS cscope: FORCE
$(call cmd,tags)
# Scripts to check various things for consistency
# ---------------------------------------------------------------------------
#通过脚本检查头文件，确定需要重新编译哪些文件
includecheck:
find * $(RCS_FIND_IGNORE) \
-name '*.[hcS]' -type f -print | sort \
| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
versioncheck:
find * $(RCS_FIND_IGNORE) \
-name '*.[hcS]' -type f -print | sort \
| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
coccicheck:
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
namespacecheck:
$(PERL) $(srctree)/scripts/namespace.pl
export_report:
$(PERL) $(srctree)/scripts/export_report.pl
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)
PHONY += kernelrelease kernelversion
kernelrelease:
@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
kernelversion:
@echo $(KERNELVERSION)
# Single targets
# ---------------------------------------------------------------------------
# Single targets are compatible with:
# - build with mixed source and output
# - build with separate output dir 'make O=...'
# - external modules
#
# target-dir => where to store outputfile
# build-dir => directory in kernel source tree to use
ifeq ($(KBUILD_EXTMOD),)
build-dir = $(patsubst %/,%,$(dir $@))
target-dir = $(dir $@)
else
zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif
%.s: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.i: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.lst: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.s: %.S prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.S prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.symtypes: %.c prepare scripts FORCE
$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
# Modules
/: prepare scripts FORCE
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
%/: prepare scripts FORCE
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir)
%.ko: prepare scripts FORCE
$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
$(build)=$(build-dir) $(@:.ko=.o)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
# FIXME Should go into a make.lib or something
# ===========================================================================
quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
cmd_rmdirs = rm -rf $(rm-dirs)
quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
cmd_rmfiles = rm -f $(rm-files)
a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
$(KBUILD_AFLAGS_KERNEL) \
$(NOSTDINC_FLAGS) $(PHOTONINCLUDE) $(KBUILD_CPPFLAGS) \
$(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
quiet_cmd_as_o_S = AS $@
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
# read all saved command lines
targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
ifneq ($(cmd_files),)
$(cmd_files): ; # Do not try to update included dependency files
include $(cmd_files)
endif
# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
# Usage:
# $(Q)$(MAKE) $(clean)=dir
clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
PHONY += FORCE
FORCE:
# Declare the contents of the .PHONY variable as phony. We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)
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