VERSION = 0
PATCHLEVEL = 1
SUBLEVEL = 4
#其中 := 表示给变量赋值并立即展开生效;= 表示延迟生效。
ARCH := arm
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
else if [ -x /bin/bash ]; then echo /bin/bash; \
else echo sh; fi ; fi)
TOPDIR := $(shell /bin/pwd)
# change this to point to the Linux include directory
#
#制定编译内核目录
LINUX_INCLUDE_DIR = /opt/host/armv4l/include/
VIVIPATH = $(TOPDIR)/include
HOSTCC = gcc
#制定本地编译器参数
HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
CROSS_COMPILE = /opt/host/armv4l/bin/armv4l-unknown-linux-
#CROSS_COMPILE = /opt/host/armv4l/bin/armv4l-redhat-linux-
# Include the make variables (CC, etc...)
#
#补全指定交叉编译链
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
CC = $(CROSS_COMPILE)gcc
CPP = $(CC) -E
AR = $(CROSS_COMPILE)ar #打包
NM = $(CROSS_COMPILE)nm
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy #转换2进制文件
OBJDUMP = $(CROSS_COMPILE)objdump
#定义为配置文件
MAKEFILES = $(TOPDIR)/.config
#一种用来计算和校验文件报文摘要的工具程序
MD5SUM = md5sum
#是一个脚本
PERL = perl
#一种脚本语言
AWK = awk
#则是子Makefile中的变量有效,如果不同的话就是调用前面定义的
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE \
CONFIG_SHELL TOPDIR VIVIPATH HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
CPP AR NM STRIP OBJCOPY OBJDUMP MAKE MAKEFILES MD5SUM PERL AWK
all: do-it-all
#make内建函数wildcard,格式为$(wildcard PATTERN),函数作用是列出当前目录下
#所有复合模式“PATTERN”格式的文件名,“PATTERN”可以使用shell可识别的通配符,包括
#“?”(单字符)和“*”(多字符)。
ifeq (.config,$(wildcard .config))
#“include”指示符告诉make暂停读取当前的Makefile,而转去读取“include”指定的一个或多个文件
#完成以后继续当前的Makefile的读取。
#“include”的语法是include FILENAMES,"FILENAMES"是shell所支持的文件名,可以使用通配符
include .config
else
CONFIGURATION = config
do-it-all: config
endif
do-it-all: Version vivi
# standard CFLAGS
#
#CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -Wno-trigraphs -O2 \
# -fomit-frame-pointer -fno-strict-aliasing -fno-common
CFLAGS := $(CPPFLAGS) -Wall -Wstrict-prototypes -O2 -fPIC -fomit-frame-pointer
AFLAGS := -D__ASSEMBLY__ $(CPPFLAGS)
CORE_FILES = init/main.o init/version.o lib/lib.o
LIBS := lib/priv_data/priv_data.o
#指定子目录
SUBDIRS = drivers lib
#CONFIG_SERISL 在./config里面定义了在include的包含下
DRIVERS-y :=
DRIVERS-$(CONFIG_SERIAL) += drivers/serial/serial.o
DRIVERS-$(CONFIG_MTD) += drivers/mtd/mtd.o
DRIVERS := $(DRIVERS-y)
CLEAN_FILES = \
vivi-elf \
vivi \
vivi.nm \
vivi.map
# Location of the gcc arm libs.
#
ARM_GCC_LIBS = /opt/host/armv4l/lib/gcc-lib/armv4l-unknown-linux/2.95.2
#ARM_GCC_LIBS = /opt/host/armv4l/lib/gcc-lib/armv4l-redhat-linux/2.95.3
LINKFLAGS = -Tarch/vivi.lds -Bstatic
DISTCLEAN_FILES = \
include/autoconf.h include/version.h \
scripts/lxdialog/*.o scripts/lxdialog/lxdialog \
.menuconfig.log \
.config .config.old TAGS tags
include arch/Makefile
Version: dummy
@rm -f include/compile.h
#ld链接器
$(LD) -v $(LINKFLAGS) \
$(HEAD) \
$(CORE_FILES) \
$(DRIVERS) \
$(LIBS) \
-o vivi-elf $(CLIBS)
#NM工具
$(NM) -v -l vivi-elf > vivi.map
#objcopy工具
$(OBJCOPY) -O binary -S vivi-elf vivi $(OBJCOPYFLAGS)
#在config比较大的时候很便捷
oldconfig:
$(CONFIG_SHELL) scripts/Configure -d arch/config.in
$(CONFIG_SHELL) scripts/Configure arch/config.in
menuconfig: include/version.h
$(MAKE) -C scripts/lxdialog all
$(CONFIG_SHELL) scripts/Menuconfig arch/config.in
find . \( -name '*.o' -o -name core -o -name ".*.flags" \) -type f -print \
| grep -v lxdialog/ | xargs rm -f
rm -f $(CLEAN_FILES)
rm -f $(DISTCLEAN_FILES)
linuxsubdirs: $(patsubst %, _dir_%, $(SUBDIRS))
$(MAKE) CFLAGS="$(CFLAGS) $(CFLAGS_KERNEL)" -C $(patsubst _dir_%, %, $@)
$(TOPDIR)/include/compile.h: include/compile.h
include/compile.h: $(CONFIGURATION) include/version.h
@echo -n \#define UTS_VERSION \"\#$(VIVIRELEASE) > .ver
@if [ -f .name ]; then echo -n \-`cat .name` >> .ver; fi
@echo ' '`date`'"' >> .ver
@echo \#define VIVI_COMPILE_TIME \"`date +%T`\" >> .ver
@echo \#define VIVI_COMPILE_BY \"`whoami`\" >> .ver
@echo \#define VIVI_COMPILE_HOST \"`hostname`\" >> .ver
@if [ -x /bin/dnsdomainname ]; then \
echo \#define VIVI_COMPILE_DOMAIN \"`dnsdomainname`\"; \
elif [ -x /bin/domainname ]; then \
echo \#define VIVI_COMPILE_DOMAIN \"`domainname`\"; \
else \
echo \#define VIVI_COMPILE_DOMAIN ; \
fi >> .ver
@echo \#define VIVI_COMPILER \"`$(CC) $(CFLAGS) -v 2>&1 | tail -1`\" >> .ver
#$@表示自动获取变量
@mv -f .ver $@
@echo \#define VIVI_RELEASE \"$(VIVIRELEASE)\" > .ver
@echo \#define VIVI_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)` >> .ver
@echo '#define VIVI_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))' >>.ver
@mv -f .ver $@
$(CC) $(CFLAGS) -DUTS_MACHINE='"$(ARCH)"' -c -o init/version.o init/version.c
$(CC) $(CFLAGS) $(CFLAGS_KERNEL) $(PROFILING) -c -o $*.o $<
etags `find include -name '*.h'`
find $(SUBDIRS) init -name '*.[ch]' | xargs etags -a
tags: dummy
CTAGSF=`ctags --version | grep -i exuberant >/dev/null && echo "-I __initdata,__exitdata,EXPORT_SYMBOL,EXPORT_SYMBOL_NOVERS"`; \
ctags $$CTAGSF `find include -name '*.h'` && \
find $(SUBDIRS) init -name '*.[ch]' | xargs ctags $$CTAGSF -a
$(MAKE) distclean
cp arch/def-configs/$* ./.config -f
$(MAKE) oldconfig
$(MAKE)
#如果没有配置直接make就会提示:
ifdef CONFIGURATION
..$(CONFIGURATION):
@echo
@echo "You have a bad or nonexistent" .$(CONFIGURATION) ": running 'make" $(CONFIGURATION)"'"
@echo
$(MAKE) $(CONFIGURATION)
@echo
@echo "Successful. Try re-making (ignore the error that follows)"
@echo
exit 1
include Rules.make