Android8.0.0-r4的编译系统

一、 概述

1.1 编译系统变化

从Android 7.0开始,android的编译系统发生了变化,之前依赖Makefile组织编译系统,从7.0开始逐步引入了kati soong(optional未正式使用,需要USE_SOONG=true开启),将Android.mk文件转化成ninja文件,使用ninja文件对编译系统进行管理。

从8.0开始,android 引入了Android.bp文件来替代之前的Android.mk文件,不同于Android.mk,Android.bp只是纯粹的配置文件,不包括分支、循环等流程控制。在android项目上如何进行选择编译、解析配置、转换成ninja等,Soong就被创造出来,将Android.bp转换为ninja文件进行管理。

同时,Soong还会编译长生一个androidmk命令可以手动将Android.mk转换成Android.bp文件。

1.2 代码位置

Kati的位置是在build/kati/中,平台也自带编译好的ckati

Soong的位置在build/soong,它和build/blueprint同时期作用,他们之间的系统关系如下:

Android.bp --> Blueprint --> Soong --> Ninja

Makefile or Android.mk --> kati --> Ninja

Blueprint是生成、解析Android.bp 的工具,是Soong的一部分。Soong是专门为Android的编译而设计的工具,blueprint只是解析文件的形式,而soong则解释内容的含义。

Blueprint和Soong都是有Go语言写的项目,从7.0开始在prebuilts/go/目录下新增了go语言的运行环境,在编译是使用。

1.3 Android ninja组织

在编译过程中,将所有的android.bp文件搜集成out\soong\build.ninja.d , 并以此为基础生成out\soong\build.ninja规则。

由所有的Android.mk生成build-aosp_arm.ninja文件。通过combined-aosp_arm.ninja将两个文件组织起来。

builddir = out

include out/build-aosp_arm.ninja

include out/soong/build.ninja

build out/combined-aosp_arm.ninja: phony out/soong/build.ninja

通过编译的LOG,首先搜集所有的bp文件生成build.ninja,然后搜集所有的mk文件生成build-aosp-arm.ninja文件。

out/soong/.bootstrap/bin/soong_build out/soong/build.ninja

out/build-aosp_arm-cleanspec.ninja is missing, regenerating...

out/build-aosp_arm.ninja is missing, regenerating...

[1/894] including out/soong/Android-aosp_arm.mk ...

经过试验表明,soong处理后的bp文件生成build.ninja的同时还包含out/soong/Android-aosp_arm.mk,这个文件是编译完成后模块的安装脚本,负责将模块安装到对应位置。比如我们现在处理的vndk相关vendor处理就是在这个目录下进行的。

在out/soong目录下有两个文件.minibootstrap/build.ninja 和.bootstrap/build.ninja两个目录。.minibootstrap/build.ninja 主要是用来编译blueprint和生成.bootstrap/build.ninja。而.bootstrap/build.ninja主要是生成 soong相关工具和out/soong/build.ninja文件。


二 、编译流程

编译步骤如下:

   1、 source build/envsetup.sh:加载命令

   2、 lunch:选择平台编译选项

   3、 make:执行编译

2.1 source build/envsetup.sh

这个命令是用来将envsetup.sh里的所有用到的命令加载到环境变量里去,我们来分析下它。

envsetup.sh里的所有命令如下:

    function hmm() #显示编译命令的帮助信息
    function build_build_var_cache()#获取所需的所有构建变量
    function destroy_build_var_cache()#删除构建变量的缓存
    function get_abs_build_var()#获取构建变量的值昨晚绝对路径
    function check_product()#检查提供的产品是否是我们可以构建的产品
    function check_variant()#检查构建变量的确切值
    function setpaths()#设置文件路径
    function printconfig()#打印配置
    function set_stuff_for_environment()#设置环境变量
    function set_sequence_number()#设置序号
    function settitle()#设置标题
    function addcompletions()#将sdk/bash_completion目录下所有的*.bash文件通过’.’操作导入到当前环境中来
    function choosetype()#根据传入选项或读取用户输入设置编译版本是release还是debug版
    function chooseproduct()#根据预先设置的变量或读取用户输入设置TARGET_PRODUCT
    function choosevariant()#读取用户输入设置TARGET_BUILD_VARIANT为user,userdebug或eng
    function choosecombo()#根据传入的3个参数,分别设置type(release, debug), product和variant(user, userdebug, eng)参数
    function add_lunch_combo()#将提供的编译选项参数添加到LUNCH_MENU_CHOICES列表中
    function print_lunch_menu()#打印编译选项列表LUNCH_MENU_CHOICES的所有项
    function lunch()#操作根据传入参数选项设置TARGET_PRODUCT, TARGET_BUILD_VARIANT和TARGET_BUILD_TYPE
    function _lunch()#提供lunch命令的补全操作
    function tapas()#以交互方式设置单个app编译的build环境变量
    function gettop#函数从指定的$TOP目录或当前目录开始查找build/core/envsetup.mk文件,并将能找到该文件的目录返回给调用函数作为操作的根目录
    function getdriver()#在定义了WITHSTATICANALYZER的情况下,返回用于代码分析工具的一些参数默认编译下WITH_STATIC_ANALYZER没有定义,所以getdriver调用返回空
    function m()#从根目录开始编译
    function findmakefile()#查找当前模块的Android.mk并输出文件的详细路径
    function mm()#编译当前目录下的所有模块,不编译外部依赖
    function mmm()#编译当前目录下的所有模块,编译外部依赖
    function mma()#相当于mm执行相应目录下的all_modules参数
    function mmma()#相当于mmm执行相应目录下的all_modules参数
    function croot()#返回根目录
    function cproj()#用于切换到当前模块的编译目录下(含有Android.mk)
    function qpid()#adb调试类
    function pid()#adb调试类
    function coredump_setup()
    function coredump_enable()
    function core()
    function systemstack()
    function stacks()
    function is64bit()
            function sgrep()#基于(c|h|cc|cpp|S|java|xml|sh|mk|aidl|vts)文件查找
    function gettargetarch#函数返回编译目标系统的CPU架构,如arm
    function ggrep()#基于(.gradle)的文件查找
    function jgrep()#基于(.java)文件查找
    function cgrep()#基于(c|cc|cpp|h|hpp)文件查找
    function resgrep()#基于res目录下(xml)文件查找
    function mangrep()#基于AndroidManifest.xml文件查找
    function sepgrep()#基于sepolicy目录下查找
    function rcgrep()#基于*.rc*文件查找
            function mgrep()#基于(Makefile|Makefile\..*|.*\.make|.*\.mak|.*\.mk)的Makefile文件查找
            function treegrep()#基于代码的文件(c|h|cpp|S|java|xml)进行查找
    function getprebuilt#返回ANDROID_PREBUILTS的路径
    function tracedmdump()
    function runhat()#
    function getbugreports()#得到bug报告
    function getsdcardpath()#得到sd卡路径
    function getscreenshotpath()#得到屏幕路径
    function getlastscreenshot()#得到屏幕焦点
    function startviewserver()#开启view服务
    function stopviewserver()#停止view服务
    function isviewserverstarted()#判断view服务是否开启
    function key_home()#输入键值
    function key_back()#输入键值
    function key_menu()#输入键值
    function smoketest()#冒烟测试
    function runtest()#自动化测试
    function godir ()#函数的用法为”Usage: godir ”,在编译路径下搜索匹配模式的目录,然后跳转到此目录
    function set_java_home()#设置$ANDROID_SET_JAVA_HOME变量
    function pez#函数的参数”$@”是一条可执行命令,通过执行结果来决定打印FAILUE和SUCCESS的颜色,失败打印红色的FAILURE,成功打印绿色的SUCCESS
    function get_make_command()#将make命令转换为command make调用
    function make()
    function provision()

   # add_lunch_combo函数被多次调用,就是它来添加Android编译选项

515unset LUNCH_MENU_CHOICES # 清空LUNCH_MENU_CHOICES变量,用来存在编译选项
516function add_lunch_combo()
517{
518    local new_combo=$1 # 获得add_lunch_combo被调用时的参数
519    local c
520    for c in ${LUNCH_MENU_CHOICES[@]} ; do # 依次遍历LUNCH_MENU_CHOICES里的值,其实该函数第一次调用时,该值为空
521        if [ "$new_combo" = "$c" ] ; then # 如果参数里的值已经存在于LUNCH_MENU_CHOICES变量里,则返回
522            return
523        fi
524    done
525    LUNCH_MENU_CHOICES=(${LUNCH_MENU_CHOICES[@]} $new_combo) # 如果参数的值不存在,则添加到LUNCH_MENU_CHOICES变量里
526}
 
   
# 这是系统自动增加的默认编译项
528# add the default one here
529add_lunch_combo aosp_arm-eng # 调用上面的add_lunch_combo函数,将aosp_arm-eng作为参数传递过去
530add_lunch_combo aosp_arm64-eng
531add_lunch_combo aosp_mips-eng
532add_lunch_combo aosp_mips64-eng
533add_lunch_combo aosp_x86-eng
534add_lunch_combo aosp_x86_64-eng
535
 
   
 
   
# 从device,vendor,product目录下查找vendorsetup.sh文件,如果查到了,就加载它
1663
1664# Execute the contents of any vendorsetup.sh files we can find.
1665for f in `test -d device && find -L device -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort` \
1666         `test -d vendor && find -L vendor -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort` \
1667         `test -d product && find -L product -maxdepth 4 -name 'vendorsetup.sh' 2> /dev/null | sort`
1668do
1669    echo "including $f" 
1670    . $f  # 执行找到的脚本,其实里面就是厂商自己定义的编译选项
1671done

envsetup.sh其主要作用如下:

  1. 加载了编译时使用到的函数命令,如:lunch,m,mm,mmm等
  2. 添加编译选项
  3. 查找厂商目录下的vendorsetup.sh,如果存在的话,加载执行它,添加厂商自己定义产品的编译选项
 其实,上述第3条是向编译系统添加了厂商自己定义产品的编译选项,里面的代码就是:add_lunch_combo xxx-xxx。

根据上面的内容,可以推测出,如果要想定义自己的产品编译项,简单的办法是直接在envsetup.sh最后,添加上add_lunch_combo myProduct-eng,当然这么做,不太符合上面代码最后的本意,我们还是老实的在vendor目录下创建自己公司名字,然后在公司目录下创建一个新的vendorsetup.sh,在里面添加上自己的产品编译项

 #mkdir vendor/farsight/
#touch vendor/farsight/vendorsetup.sh
#echo "add_lunch_combo fs100-eng" > vendor/farsight/vendorsetup.sh

这样,当我们在执行source build/envsetup.sh命令的时候,可以在shell上看到下面的信息:

 including vendor/farsight/vendorsetup.sh

2.2 lunch

当然如果你按上述命令执行,它编译的还是通用的eng版本系统,不是我们个性系统,我们可以执行lunch命令,它会打印出一个选择菜单,列出可用的编译选项
如果你按照第一步中添加了vendorsetup.sh那么,你的选项中会出现:
 You're building on Linux
Lunch menu... pick a combo:
     
1. aosp_arm-eng
     2. aosp_arm64-eng
     3. aosp_mips-eng
lunch命令是envsetup.sh里定义的一个命令,用来让用户选择编译项,来定义Product和编译过程中用到的全局变量。
eng是产品的编译类型,除了eng外,还有user, userdebug,分别表示:
eng: 工程机,
user:最终用户机
userdebug:调试测试机
tests:测试机 

eng:  默认的特征. 一个简单的”make”等同于”make eng”. droid 是eng的别名.
安装标记为: eng, debug, user, 以及/或者 development的模块。
安装没有特殊标签的非apk模块。
通过产品定义的文件安装未标记的apk.
ro.secure=0
ro.debuggable=1
ro.kernel.android.checkjni=1
adb默认开启。
user:为release版本的代码特征
安装标签为user的模块.
安装没有特殊标签的非apk模块。
通过产品定义文件安装apk; 对于apk模块来说标签是被忽略的。
ro.secure=1
ro.debuggable=0
adb默认关闭。
userdebug:其他与user相同, 除了:
也安装标签为 debug的模块。
ro.debuggable=1
adb默认开启。

由此可见,除了eng和user外,另外两个一般不能交给最终用户的
那么这四个类型是干什么用的呢?其实,在main.mk里有说明,在Android的源码里,每一个目标(也可以看成工程)目录都有一个Android.mk的makefile,每个目标的Android.mk中有一个类型声明:LOCAL_MODULE_TAGS,这个TAGS就是用来指定,当前的目标编译完了属于哪个分类里。
 PS:Android.mk和Linux里的makefile不太一样,它是Android编译系统自己定义的一个makefile来方便编译成:c,c++的动态、静态库或可执行程序,或java库或android的程序,

lunch命令:

555function lunch()
556{
557    local answer
558
559    if [ "$1" ] ; then
560        answer=$1 # lunch后面直接带参数
561    else
562        print_lunch_menu # lunch后面不带参数,则打印处所有的target product和variant菜单提供用户选择
563        echo -n "Which would you like? [aosp_arm-eng] "
564        read answer
565    fi
566
567    local selection=
568
569    if [ -z "$answer" ]
570    then
571        selection=aosp_arm-eng # 如果用户在菜单中没有选择,直接回车,则为系统缺省的aosp_arm-eng
572    elif (echo -n $answer | grep -q -e "^[0-9][0-9]*$")
573    then  # 如果answer是选择菜单的数字,则获取该数字对应的字符串
574        if [ $answer -le ${#LUNCH_MENU_CHOICES[@]} ]
575        then
576            selection=${LUNCH_MENU_CHOICES[$(($answer-1))]}
577        fi
578    else
579        selection=$answer
580    fi
581
582    export TARGET_BUILD_APPS=
583
584    local product variant_and_version variant version
585
586    product=${selection%%-*} # Trim everything up to first dash
587    variant_and_version=${selection#*-} # Trim everything up to first dash
588    if [ "$variant_and_version" != "$selection" ]; then
589        variant=${variant_and_version%%-*}
590        if [ "$variant" != "$variant_and_version" ]; then
591            version=${variant_and_version#*-}
592        fi
593    fi
594
595    if [ -z "$product" ]
596    then
597        echo
598        echo "Invalid lunch combo: $selection"
599        return 1
600    fi
601
602    TARGET_PRODUCT=$product \
603    TARGET_BUILD_VARIANT=$variant \
604    TARGET_PLATFORM_VERSION=$version \
605    build_build_var_cache
606    if [ $? -ne 0 ]
607    then
608        return 1
609    fi
610    #  导出环境变量,这里很重要,因为后面的编译系统都是依赖于这里定义的几个变量的
611    export TARGET_PRODUCT=$(get_build_var TARGET_PRODUCT)
612    export TARGET_BUILD_VARIANT=$(get_build_var TARGET_BUILD_VARIANT)
613    export TARGET_PLATFORM_VERSION=$(get_build_var TARGET_PLATFORM_VERSION)
614    export TARGET_BUILD_TYPE=release
615
616    echo
617    # 设置到环境变量
618    set_stuff_for_environment
619    printconfig  # 打印一些主要的变量, 调用关系 printconfig()->get_build_var()->build/core/config.mk->build/core/envsetup.mk
620    destroy_build_var_cache
621}
622
lunch命令可以带参数和不带参数,最终导出一些重要的环境变量,从而影响编译系统的编译结果

2.3 make 流程

2.3.1 Makefile文件

执行make命令的结果就是去执行当前目录下的Makefile文件

1### DO NOT EDIT THIS FILE ###
2include build/core/main.mk
3### DO NOT EDIT THIS FILE ###

main.mk文件里虽然脚本不多,但是却定义了整个Android的编译关系,它主要引入了下列几个重要的mk文件

49include $(BUILD_SYSTEM)/config.mk
 
   
86include $(BUILD_SYSTEM)/cleanbuild.mk
 
   
273include $(BUILD_SYSTEM)/definitions.mk
 
   
 
   
 
   
 
   

Android8.0.0-r4的编译系统_第1张图片

所有的Makefile都通过build/core/main.mk这个文件组织在一起,它定义了一个默认goals:droid,当在根目录下,输入make实际上就等同于我们执行make droid。

当Make include所有的文件,完成对所有make文件的解析以后就会寻找生成droid的规则,依次生成它的依赖,直到所有满足的模块被编译好,然后使用相应的工具打包成相应的img。其中,config.mk,envsetup.mk,product_config.mk文件是编译用户指定平台系统的关键文件。上图中红色部分是用户指定平台产品的编译主线,下面config.mk的主要作用

2.3.2 build/core/config.mk

该文件被main.mk包含
定义了以下环境变量:

74SRC_TARGET_DIR := $(TOPDIR)build/target
75SRC_API_DIR := $(TOPDIR)prebuilts/sdk/api
76SRC_SYSTEM_API_DIR := $(TOPDIR)prebuilts/sdk/system-api
77SRC_TEST_API_DIR := $(TOPDIR)prebuilts/sdk/test-api
78
79# Some specific paths to tools
80SRC_DROIDDOC_DIR := $(TOPDIR)build/tools/droiddoc
81
82# Set up efficient math functions which are used in make.
83# Here since this file is included by envsetup as well as during build.
84include $(BUILD_SYSTEM)/math.mk
85
86# Various mappings to avoid hard-coding paths all over the place
87include $(BUILD_SYSTEM)/pathmap.mk
88
89# ###############################################################
90# Build system internal files
91# ###############################################################
92
93BUILD_COMBOS:= $(BUILD_SYSTEM)/combo
94
95CLEAR_VARS:= $(BUILD_SYSTEM)/clear_vars.mk
96BUILD_HOST_STATIC_LIBRARY:= $(BUILD_SYSTEM)/host_static_library.mk
97BUILD_HOST_SHARED_LIBRARY:= $(BUILD_SYSTEM)/host_shared_library.mk
98BUILD_STATIC_LIBRARY:= $(BUILD_SYSTEM)/static_library.mk
99BUILD_HEADER_LIBRARY:= $(BUILD_SYSTEM)/header_library.mk
100BUILD_AUX_STATIC_LIBRARY:= $(BUILD_SYSTEM)/aux_static_library.mk
101BUILD_AUX_EXECUTABLE:= $(BUILD_SYSTEM)/aux_executable.mk
102BUILD_SHARED_LIBRARY:= $(BUILD_SYSTEM)/shared_library.mk
103BUILD_EXECUTABLE:= $(BUILD_SYSTEM)/executable.mk
104BUILD_HOST_EXECUTABLE:= $(BUILD_SYSTEM)/host_executable.mk
105BUILD_PACKAGE:= $(BUILD_SYSTEM)/package.mk
106BUILD_PHONY_PACKAGE:= $(BUILD_SYSTEM)/phony_package.mk
107BUILD_RRO_PACKAGE:= $(BUILD_SYSTEM)/build_rro_package.mk
108BUILD_HOST_PREBUILT:= $(BUILD_SYSTEM)/host_prebuilt.mk
109BUILD_PREBUILT:= $(BUILD_SYSTEM)/prebuilt.mk
110BUILD_MULTI_PREBUILT:= $(BUILD_SYSTEM)/multi_prebuilt.mk
111BUILD_JAVA_LIBRARY:= $(BUILD_SYSTEM)/java_library.mk
112BUILD_STATIC_JAVA_LIBRARY:= $(BUILD_SYSTEM)/static_java_library.mk
113BUILD_HOST_JAVA_LIBRARY:= $(BUILD_SYSTEM)/host_java_library.mk
114BUILD_DROIDDOC:= $(BUILD_SYSTEM)/droiddoc.mk
115BUILD_COPY_HEADERS := $(BUILD_SYSTEM)/copy_headers.mk
116BUILD_NATIVE_TEST := $(BUILD_SYSTEM)/native_test.mk
117BUILD_NATIVE_BENCHMARK := $(BUILD_SYSTEM)/native_benchmark.mk
118BUILD_HOST_NATIVE_TEST := $(BUILD_SYSTEM)/host_native_test.mk
119BUILD_FUZZ_TEST := $(BUILD_SYSTEM)/fuzz_test.mk
120BUILD_HOST_FUZZ_TEST := $(BUILD_SYSTEM)/host_fuzz_test.mk
121
122BUILD_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/shared_test_lib.mk
123BUILD_HOST_SHARED_TEST_LIBRARY := $(BUILD_SYSTEM)/host_shared_test_lib.mk
124BUILD_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/static_test_lib.mk
125BUILD_HOST_STATIC_TEST_LIBRARY := $(BUILD_SYSTEM)/host_static_test_lib.mk
126
127BUILD_NOTICE_FILE := $(BUILD_SYSTEM)/notice_files.mk
128BUILD_HOST_DALVIK_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_java_library.mk
129BUILD_HOST_DALVIK_STATIC_JAVA_LIBRARY := $(BUILD_SYSTEM)/host_dalvik_static_java_library.mk
 
   
上述命令变量其实是对应的mk文件名,所有的Android.mk文件里基本上都包含上述命令变量,如
         CLEAR_VARS:用来清除之前定义的环境变量
         BUILD_SHARED_LIBRARY:用来指定编译动态库过程

184include $(BUILD_SYSTEM)/envsetup.mk

2.3.3 build/core/envsetup.mk

84# was invoked with a PRODUCT-xxx-yyy goal.
85ifeq ($(TARGET_PRODUCT),) #判断TARGET_PRODUCT是否为空
86TARGET_PRODUCT := aosp_arm
87endif
 
   
91ifeq ($(strip $(TARGET_BUILD_VARIANT)),)
92TARGET_BUILD_VARIANT := eng
93endif
 
   
 
   
189include $(BUILD_SYSTEM)/product_config.mk
 
   
 
   
282# ---------------------------------------------------------------
283# figure out the output directories
284
285ifeq (,$(strip $(OUT_DIR)))
286ifeq (,$(strip $(OUT_DIR_COMMON_BASE)))
287OUT_DIR := $(TOPDIR)out
288else
289OUT_DIR := $(OUT_DIR_COMMON_BASE)/$(notdir $(PWD))
290endif
291endif
292
293SOONG_OUT_DIR := $(OUT_DIR)/soong
294
295DEBUG_OUT_DIR := $(OUT_DIR)/debug
296
297# Move the host or target under the debug/ directory
298# if necessary.
299TARGET_OUT_ROOT_release := $(OUT_DIR)/target
300TARGET_OUT_ROOT_debug := $(DEBUG_OUT_DIR)/target
301TARGET_OUT_ROOT := $(TARGET_OUT_ROOT_$(TARGET_BUILD_TYPE))
302
303HOST_OUT_ROOT_release := $(OUT_DIR)/host
304HOST_OUT_ROOT_debug := $(DEBUG_OUT_DIR)/host
305HOST_OUT_ROOT := $(HOST_OUT_ROOT_$(HOST_BUILD_TYPE))
306
307# We want to avoid two host bin directories in multilib build.
308HOST_OUT_release := $(HOST_OUT_ROOT_release)/$(HOST_OS)-$(HOST_PREBUILT_ARCH)
309HOST_OUT_debug := $(HOST_OUT_ROOT_debug)/$(HOST_OS)-$(HOST_PREBUILT_ARCH)
310HOST_OUT := $(HOST_OUT_$(HOST_BUILD_TYPE))
311SOONG_HOST_OUT := $(SOONG_OUT_DIR)/host/$(HOST_OS)-$(HOST_PREBUILT_ARCH)
312# TODO: remove
313BUILD_OUT := $(HOST_OUT)
314
315HOST_CROSS_OUT_release := $(HOST_OUT_ROOT_release)/windows-$(HOST_PREBUILT_ARCH)
316HOST_CROSS_OUT_debug := $(HOST_OUT_ROOT_debug)/windows-$(HOST_PREBUILT_ARCH)
317HOST_CROSS_OUT := $(HOST_CROSS_OUT_$(HOST_BUILD_TYPE))
318
319TARGET_PRODUCT_OUT_ROOT := $(TARGET_OUT_ROOT)/product
320
321TARGET_COMMON_OUT_ROOT := $(TARGET_OUT_ROOT)/common
322HOST_COMMON_OUT_ROOT := $(HOST_OUT_ROOT)/common
323
324PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)
325
326OUT_DOCS := $(TARGET_COMMON_OUT_ROOT)/docs
327
328BUILD_OUT_EXECUTABLES := $(BUILD_OUT)/bin
329SOONG_HOST_OUT_EXECUTABLES := $(SOONG_HOST_OUT)/bin
330
331HOST_OUT_EXECUTABLES := $(HOST_OUT)/bin
332HOST_OUT_SHARED_LIBRARIES := $(HOST_OUT)/lib64
333HOST_OUT_RENDERSCRIPT_BITCODE := $(HOST_OUT_SHARED_LIBRARIES)
334HOST_OUT_JAVA_LIBRARIES := $(HOST_OUT)/framework
335HOST_OUT_SDK_ADDON := $(HOST_OUT)/sdk_addon
336HOST_OUT_NATIVE_TESTS := $(HOST_OUT)/nativetest64
337HOST_OUT_COVERAGE := $(HOST_OUT)/coverage
338
339HOST_CROSS_OUT_EXECUTABLES := $(HOST_CROSS_OUT)/bin
340HOST_CROSS_OUT_SHARED_LIBRARIES := $(HOST_CROSS_OUT)/lib
341HOST_CROSS_OUT_NATIVE_TESTS := $(HOST_CROSS_OUT)/nativetest
342HOST_CROSS_OUT_COVERAGE := $(HOST_CROSS_OUT)/coverage
343HOST_OUT_TESTCASES := $(HOST_OUT)/testcases
344
345HOST_OUT_INTERMEDIATES := $(HOST_OUT)/obj
346HOST_OUT_INTERMEDIATE_LIBRARIES := $(HOST_OUT_INTERMEDIATES)/lib
347HOST_OUT_NOTICE_FILES := $(HOST_OUT_INTERMEDIATES)/NOTICE_FILES
348HOST_OUT_COMMON_INTERMEDIATES := $(HOST_COMMON_OUT_ROOT)/obj
349HOST_OUT_FAKE := $(HOST_OUT)/fake_packages
350
351# Nano environment config
352include $(BUILD_SYSTEM)/aux_config.mk
353
354HOST_CROSS_OUT_INTERMEDIATES := $(HOST_CROSS_OUT)/obj
355HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES := $(HOST_CROSS_OUT_INTERMEDIATES)/lib
356HOST_CROSS_OUT_NOTICE_FILES := $(HOST_CROSS_OUT_INTERMEDIATES)/NOTICE_FILES
357
358HOST_OUT_GEN := $(HOST_OUT)/gen
359HOST_OUT_COMMON_GEN := $(HOST_COMMON_OUT_ROOT)/gen
360
361HOST_CROSS_OUT_GEN := $(HOST_CROSS_OUT)/gen
362
363# Out for HOST_2ND_ARCH
364HOST_2ND_ARCH_VAR_PREFIX := 2ND_
365HOST_2ND_ARCH_MODULE_SUFFIX := _32
366$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_INTERMEDIATES := $(HOST_OUT)/obj32
367$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_INTERMEDIATE_LIBRARIES := $($(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_INTERMEDIATES)/lib
368$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_SHARED_LIBRARIES := $(HOST_OUT)/lib
369$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_EXECUTABLES := $(HOST_OUT_EXECUTABLES)
370$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_JAVA_LIBRARIES := $(HOST_OUT_JAVA_LIBRARIES)
371$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_NATIVE_TESTS := $(HOST_OUT)/nativetest
372$(HOST_2ND_ARCH_VAR_PREFIX)HOST_OUT_TESTCASES := $(HOST_OUT_TESTCASES)
373
374# The default host library path.
375# It always points to the path where we build libraries in the default bitness.
376HOST_LIBRARY_PATH := $(HOST_OUT_SHARED_LIBRARIES)
377
378# Out for HOST_CROSS_2ND_ARCH
379HOST_CROSS_2ND_ARCH_VAR_PREFIX := 2ND_
380HOST_CROSS_2ND_ARCH_MODULE_SUFFIX := _64
381$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_INTERMEDIATES := $(HOST_CROSS_OUT)/obj64
382$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES := $($(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_INTERMEDIATES)/lib
383$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_SHARED_LIBRARIES := $(HOST_CROSS_OUT)/lib64
384$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_EXECUTABLES := $(HOST_CROSS_OUT_EXECUTABLES)
385$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_OUT_NATIVE_TESTS := $(HOST_CROSS_OUT)/nativetest64
386
387TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj
388TARGET_OUT_HEADERS := $(TARGET_OUT_INTERMEDIATES)/include
389TARGET_OUT_INTERMEDIATE_LIBRARIES := $(TARGET_OUT_INTERMEDIATES)/lib
390TARGET_OUT_COMMON_INTERMEDIATES := $(TARGET_COMMON_OUT_ROOT)/obj
391
392TARGET_OUT_GEN := $(PRODUCT_OUT)/gen
393TARGET_OUT_COMMON_GEN := $(TARGET_COMMON_OUT_ROOT)/gen
394
395TARGET_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_SYSTEM)
396ifneq ($(filter address,$(SANITIZE_TARGET)),)
397target_out_shared_libraries_base := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_ASAN)/system
398else
399target_out_shared_libraries_base := $(TARGET_OUT)
400endif
401
402TARGET_OUT_EXECUTABLES := $(TARGET_OUT)/bin
403TARGET_OUT_OPTIONAL_EXECUTABLES := $(TARGET_OUT)/xbin
404ifeq ($(TARGET_IS_64_BIT),true)
405# /system/lib always contains 32-bit libraries,
406# and /system/lib64 (if present) always contains 64-bit libraries.
407TARGET_OUT_SHARED_LIBRARIES := $(target_out_shared_libraries_base)/lib64
408else
409TARGET_OUT_SHARED_LIBRARIES := $(target_out_shared_libraries_base)/lib
410endif
411TARGET_OUT_RENDERSCRIPT_BITCODE := $(TARGET_OUT_SHARED_LIBRARIES)
412TARGET_OUT_JAVA_LIBRARIES := $(TARGET_OUT)/framework
413TARGET_OUT_APPS := $(TARGET_OUT)/app
414TARGET_OUT_APPS_PRIVILEGED := $(TARGET_OUT)/priv-app
415TARGET_OUT_KEYLAYOUT := $(TARGET_OUT)/usr/keylayout
416TARGET_OUT_KEYCHARS := $(TARGET_OUT)/usr/keychars
417TARGET_OUT_ETC := $(TARGET_OUT)/etc
418TARGET_OUT_NOTICE_FILES := $(TARGET_OUT_INTERMEDIATES)/NOTICE_FILES
419TARGET_OUT_FAKE := $(PRODUCT_OUT)/fake_packages
420TARGET_OUT_TESTCASES := $(PRODUCT_OUT)/testcases
421
422TARGET_OUT_SYSTEM_OTHER := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_SYSTEM_OTHER)
423
424# Out for TARGET_2ND_ARCH
425TARGET_2ND_ARCH_VAR_PREFIX := $(HOST_2ND_ARCH_VAR_PREFIX)
426ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
427# With this you can reference the arm binary translation library with libfoo_arm in PRODUCT_PACKAGES.
428TARGET_2ND_ARCH_MODULE_SUFFIX := _$(TARGET_2ND_ARCH)
429else
430TARGET_2ND_ARCH_MODULE_SUFFIX := $(HOST_2ND_ARCH_MODULE_SUFFIX)
431endif
432$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATES := $(PRODUCT_OUT)/obj_$(TARGET_2ND_ARCH)
433$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATE_LIBRARIES := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_INTERMEDIATES)/lib
434ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
435$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_SHARED_LIBRARIES := $(target_out_shared_libraries_base)/lib/$(TARGET_2ND_ARCH)
436else
437$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_SHARED_LIBRARIES := $(target_out_shared_libraries_base)/lib
438endif
439$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_RENDERSCRIPT_BITCODE := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_SHARED_LIBRARIES)
440$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_EXECUTABLES := $(TARGET_OUT_EXECUTABLES)
441$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_APPS := $(TARGET_OUT_APPS)
442$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_APPS_PRIVILEGED := $(TARGET_OUT_APPS_PRIVILEGED)
443$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_TESTCASES := $(TARGET_OUT_TESTCASES)
444
445TARGET_OUT_DATA := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_DATA)
446TARGET_OUT_DATA_EXECUTABLES := $(TARGET_OUT_EXECUTABLES)
447TARGET_OUT_DATA_SHARED_LIBRARIES := $(TARGET_OUT_SHARED_LIBRARIES)
448TARGET_OUT_DATA_JAVA_LIBRARIES := $(TARGET_OUT_DATA)/framework
449TARGET_OUT_DATA_APPS := $(TARGET_OUT_DATA)/app
450TARGET_OUT_DATA_KEYLAYOUT := $(TARGET_OUT_KEYLAYOUT)
451TARGET_OUT_DATA_KEYCHARS := $(TARGET_OUT_KEYCHARS)
452TARGET_OUT_DATA_ETC := $(TARGET_OUT_ETC)
453ifeq ($(TARGET_IS_64_BIT),true)
454TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest64
455TARGET_OUT_DATA_METRIC_TESTS := $(TARGET_OUT_DATA)/benchmarktest64
456else
457TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest
458TARGET_OUT_DATA_METRIC_TESTS := $(TARGET_OUT_DATA)/benchmarktest
459endif
460TARGET_OUT_DATA_FAKE := $(TARGET_OUT_DATA)/fake_packages
461
462$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_EXECUTABLES := $(TARGET_OUT_DATA_EXECUTABLES)
463$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_SHARED_LIBRARIES := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_SHARED_LIBRARIES)
464$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_APPS := $(TARGET_OUT_DATA_APPS)
465ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
466$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest/$(TARGET_2ND_ARCH)
467$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_METRIC_TESTS := $(TARGET_OUT_DATA)/benchmarktest/$(TARGET_2ND_ARCH)
468else
469$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_NATIVE_TESTS := $(TARGET_OUT_DATA)/nativetest
470$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_DATA_METRIC_TESTS := $(TARGET_OUT_DATA)/benchmarktest
471endif
472
473TARGET_OUT_CACHE := $(PRODUCT_OUT)/cache
474
475TARGET_OUT_VENDOR := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_VENDOR)
476ifneq ($(filter address,$(SANITIZE_TARGET)),)
477target_out_vendor_shared_libraries_base := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_ASAN)/vendor
478else
479target_out_vendor_shared_libraries_base := $(TARGET_OUT_VENDOR)
480endif
481
482TARGET_OUT_VENDOR_EXECUTABLES := $(TARGET_OUT_VENDOR)/bin
483TARGET_OUT_VENDOR_OPTIONAL_EXECUTABLES := $(TARGET_OUT_VENDOR)/xbin
484ifeq ($(TARGET_IS_64_BIT),true)
485TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(target_out_vendor_shared_libraries_base)/lib64
486else
487TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(target_out_vendor_shared_libraries_base)/lib
488endif
489TARGET_OUT_VENDOR_RENDERSCRIPT_BITCODE := $(TARGET_OUT_VENDOR_SHARED_LIBRARIES)
490TARGET_OUT_VENDOR_JAVA_LIBRARIES := $(TARGET_OUT_VENDOR)/framework
491TARGET_OUT_VENDOR_APPS := $(TARGET_OUT_VENDOR)/app
492TARGET_OUT_VENDOR_APPS_PRIVILEGED := $(TARGET_OUT_VENDOR)/priv-app
493TARGET_OUT_VENDOR_ETC := $(TARGET_OUT_VENDOR)/etc
494
495$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_EXECUTABLES := $(TARGET_OUT_VENDOR_EXECUTABLES)
496ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
497$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(target_out_vendor_shared_libraries_base)/lib/$(TARGET_2ND_ARCH)
498else
499$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_SHARED_LIBRARIES := $(target_out_vendor_shared_libraries_base)/lib
500endif
501$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_RENDERSCRIPT_BITCODE := $($(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_SHARED_LIBRARIES)
502$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_APPS := $(TARGET_OUT_VENDOR_APPS)
503$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_VENDOR_APPS_PRIVILEGED := $(TARGET_OUT_VENDOR_APPS_PRIVILEGED)
504
505TARGET_OUT_OEM := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_OEM)
506TARGET_OUT_OEM_EXECUTABLES := $(TARGET_OUT_OEM)/bin
507ifeq ($(TARGET_IS_64_BIT),true)
508TARGET_OUT_OEM_SHARED_LIBRARIES := $(TARGET_OUT_OEM)/lib64
509else
510TARGET_OUT_OEM_SHARED_LIBRARIES := $(TARGET_OUT_OEM)/lib
511endif
512# We don't expect Java libraries in the oem.img.
513# TARGET_OUT_OEM_JAVA_LIBRARIES:= $(TARGET_OUT_OEM)/framework
514TARGET_OUT_OEM_APPS := $(TARGET_OUT_OEM)/app
515TARGET_OUT_OEM_ETC := $(TARGET_OUT_OEM)/etc
516
517$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_OEM_EXECUTABLES := $(TARGET_OUT_OEM_EXECUTABLES)
518ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
519$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_OEM_SHARED_LIBRARIES := $(TARGET_OUT_OEM)/lib/$(TARGET_2ND_ARCH)
520else
521$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_OEM_SHARED_LIBRARIES := $(TARGET_OUT_OEM)/lib
522endif
523$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_OEM_APPS := $(TARGET_OUT_OEM_APPS)
524
525TARGET_OUT_ODM := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_ODM)
526TARGET_OUT_ODM_EXECUTABLES := $(TARGET_OUT_ODM)/bin
527ifeq ($(TARGET_IS_64_BIT),true)
528TARGET_OUT_ODM_SHARED_LIBRARIES := $(TARGET_OUT_ODM)/lib64
529else
530TARGET_OUT_ODM_SHARED_LIBRARIES := $(TARGET_OUT_ODM)/lib
531endif
532TARGET_OUT_ODM_APPS := $(TARGET_OUT_ODM)/app
533TARGET_OUT_ODM_ETC := $(TARGET_OUT_ODM)/etc
534
535$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_EXECUTABLES := $(TARGET_OUT_ODM_EXECUTABLES)
536ifeq ($(TARGET_TRANSLATE_2ND_ARCH),true)
537$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_SHARED_LIBRARIES := $(TARGET_OUT_ODM)/lib/$(TARGET_2ND_ARCH)
538else
539$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_SHARED_LIBRARIES := $(TARGET_OUT_ODM)/lib
540endif
541$(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_OUT_ODM_APPS := $(TARGET_OUT_ODM_APPS)
542
543TARGET_OUT_BREAKPAD := $(PRODUCT_OUT)/breakpad
544
545TARGET_OUT_UNSTRIPPED := $(PRODUCT_OUT)/symbols
546TARGET_OUT_EXECUTABLES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/bin
547TARGET_OUT_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/system/lib
548TARGET_OUT_VENDOR_SHARED_LIBRARIES_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/$(TARGET_COPY_OUT_VENDOR)/lib
549TARGET_ROOT_OUT_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)
550TARGET_ROOT_OUT_SBIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/sbin
551TARGET_ROOT_OUT_BIN_UNSTRIPPED := $(TARGET_OUT_UNSTRIPPED)/bin
552TARGET_OUT_COVERAGE := $(PRODUCT_OUT)/coverage
553
554TARGET_ROOT_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_ROOT)
555TARGET_ROOT_OUT_BIN := $(TARGET_ROOT_OUT)/bin
556TARGET_ROOT_OUT_SBIN := $(TARGET_ROOT_OUT)/sbin
557TARGET_ROOT_OUT_ETC := $(TARGET_ROOT_OUT)/etc
558TARGET_ROOT_OUT_USR := $(TARGET_ROOT_OUT)/usr
559
560TARGET_RECOVERY_OUT := $(PRODUCT_OUT)/$(TARGET_COPY_OUT_RECOVERY)
561TARGET_RECOVERY_ROOT_OUT := $(TARGET_RECOVERY_OUT)/root
562
563TARGET_SYSLOADER_OUT := $(PRODUCT_OUT)/sysloader
564TARGET_SYSLOADER_ROOT_OUT := $(TARGET_SYSLOADER_OUT)/root
565TARGET_SYSLOADER_SYSTEM_OUT := $(TARGET_SYSLOADER_OUT)/root/system
566
567TARGET_INSTALLER_OUT := $(PRODUCT_OUT)/installer
568TARGET_INSTALLER_DATA_OUT := $(TARGET_INSTALLER_OUT)/data
569TARGET_INSTALLER_ROOT_OUT := $(TARGET_INSTALLER_OUT)/root
570TARGET_INSTALLER_SYSTEM_OUT := $(TARGET_INSTALLER_OUT)/root/system


envsetup.mk文件主要包含了product_config.mk文件,然后指定了编译时要输出的所有文件的OUT目录

2.3.4 build/core/product_config.mk

173# ---------------------------------------------------------------
174# Include the product definitions.
175# We need to do this to translate TARGET_PRODUCT into its
176# underlying TARGET_DEVICE before we start defining any rules.
177#
178include $(BUILD_SYSTEM)/node_fns.mk
179include $(BUILD_SYSTEM)/product.mk
180include $(BUILD_SYSTEM)/device.mk
181
182ifneq ($(strip $(TARGET_BUILD_APPS)),)
183# An unbundled app build needs only the core product makefiles.
184all_product_configs := $(call get-product-makefiles,\
185    $(SRC_TARGET_DIR)/product/AndroidProducts.mk)
186else
187# Read in all of the product definitions specified by the AndroidProducts.mk
188# files in the tree.
189all_product_configs := $(get-all-product-makefiles)
190endif
191
192all_named_products :=
193
194# Find the product config makefile for the current product.
195# all_product_configs consists items like:
196# :
197# or just  in case the product name is the
198# same as the base filename of the product config makefile.
199current_product_makefile :=
200all_product_makefiles :=
201$(foreach f, $(all_product_configs),\
202    $(eval _cpm_words := $(subst :,$(space),$(f)))\
203    $(eval _cpm_word1 := $(word 1,$(_cpm_words)))\
204    $(eval _cpm_word2 := $(word 2,$(_cpm_words)))\
205    $(if $(_cpm_word2),\
206        $(eval all_product_makefiles += $(_cpm_word2))\
207        $(eval all_named_products += $(_cpm_word1))\
208        $(if $(filter $(TARGET_PRODUCT),$(_cpm_word1)),\
209            $(eval current_product_makefile += $(_cpm_word2)),),\
210        $(eval all_product_makefiles += $(f))\
211        $(eval all_named_products += $(basename $(notdir $(f))))\
212        $(if $(filter $(TARGET_PRODUCT),$(basename $(notdir $(f)))),\
213            $(eval current_product_makefile += $(f)),)))
214_cpm_words :=
215_cpm_word1 :=
216_cpm_word2 :=
217current_product_makefile := $(strip $(current_product_makefile))
218all_product_makefiles := $(strip $(all_product_makefiles))
219
220load_all_product_makefiles :=
221ifneq (,$(filter product-graph, $(MAKECMDGOALS)))
222ifeq ($(ANDROID_PRODUCT_GRAPH),--all)
223load_all_product_makefiles := true
224endif
225endif
226ifneq (,$(filter dump-products,$(MAKECMDGOALS)))
227ifeq ($(ANDROID_DUMP_PRODUCTS),all)
228load_all_product_makefiles := true
229endif
230endif
231
232ifeq ($(load_all_product_makefiles),true)
233# Import all product makefiles.
234$(call import-products, $(all_product_makefiles)) #读取指定的目录下所有的AndrodProducts.mk文件中定义的产品信息
235else
236# Import just the current product.
237ifndef current_product_makefile
238$(error Can not locate config makefile for product "$(TARGET_PRODUCT)")
239endif
240ifneq (1,$(words $(current_product_makefile)))
241$(error Product "$(TARGET_PRODUCT)" ambiguous: matches $(current_product_makefile))
242endif
243$(call import-products, $(current_product_makefile))
244endif  # Import all or just the current product makefile
245
246# Sanity check
247$(check-all-products)
248
249ifneq ($(filter dump-products, $(MAKECMDGOALS)),)
250$(dump-products)
251$(error done)
252endif
253
254# Convert a short name like "sooner" into the path to the product
255# file defining that product.
256#
257INTERNAL_PRODUCT := $(call resolve-short-product-name, $(TARGET_PRODUCT)) #调用了resolve-short-product-name函数,它将返回TARGET_PRODUCT产品的配置文件目录,并赋给INTERNAL_PRODUCT
258ifneq ($(current_product_makefile),$(INTERNAL_PRODUCT))
259$(error PRODUCT_NAME inconsistent in $(current_product_makefile) and $(INTERNAL_PRODUCT))
260endif
261current_product_makefile :=
262all_product_makefiles :=
263all_product_configs :=
product_config.mk主要读取vendor目录下不同厂商自己定义的AndrodProducts.mk文件,从该文件里取得所有产品的配置文件,然后再根据lunch选择的编译项TARGET_PRODUCT,找到与之对应的配置文件,然后设置TARGET_DEVICE变量,用于后续编译。

2.3.5 build/core/product.mk

26# Search for AndroidProducts.mks in the given dir.
27# $(1): the path to the dir
28define _search-android-products-files-in-dir
29$(sort $(shell test -d $(1) && find -L $(1) \
30  -maxdepth 6 \
31  -name .git -prune \
32  -o -name AndroidProducts.mk -print))
33endef
34
35#
36# Returns the list of all AndroidProducts.mk files.
37# $(call ) isn't necessary.
38#
39define _find-android-products-files
40$(foreach d, device vendor product,$(call _search-android-products-files-in-dir,$(d))) \
41  $(SRC_TARGET_DIR)/product/AndroidProducts.mk
42endef
43
44#
45# Returns the sorted concatenation of PRODUCT_MAKEFILES
46# variables set in the given AndroidProducts.mk files.
47# $(1): the list of AndroidProducts.mk files.
48#
49define get-product-makefiles
50$(sort \
51  $(foreach f,$(1), \
52    $(eval PRODUCT_MAKEFILES :=) \
53    $(eval LOCAL_DIR := $(patsubst %/,%,$(dir $(f)))) \
54    $(eval include $(f)) \
55    $(PRODUCT_MAKEFILES) \
56   ) \
57  $(eval PRODUCT_MAKEFILES :=) \
58  $(eval LOCAL_DIR :=) \
59 )
60endef
要是一些用来处理AndroidProduct.mk的函数
_find-android-products-files:用来获得vendor目录下,所有名字为AndroidProduct.mk的文件列表。
get-all-product-makefiles:用来获得所有AndroidProduct.mk文件里定义的PRODUCT_MAKEFILES的值(其实是产品文件路径名)。
在vendor目录下,每个公司目录下都会存在一个AndroidProduct.mk文件,这个文件是用来定义这个公司的产品列表,每个产品用.mk来表示
如Android给的示例:vendor/sample/products/AndroidProduct.mk

总结:
如果用户想个性定制自己的产品,应该有以下流程,包含上一节内容:
1. 创建公司目录
    #mkdir vendor/farsight
2. 创建一个vendorsetup.sh文件,将当前产品编译项添加到lunch里,让lunch能找到用户个性定制编译项
    #echo "add_lunch_combo fs100-eng" > vendor/farsight/vendorsetup.sh
3. 仿着Android示例代码,在公司目录下创建products目录
    #mkdir -p vendor/farsight/products
4. 仿着Android示例代码,在products目录下创建两个mk文件
    #touch vendor/farsight/products/AndroidProduct.mk vendor/farsight/products/fs100.mk
在AndroidProduct.mk里添加如下内容:
PRODUCT_MAKEFILES := $(LOCAL_DIR)/fs100.mk
表示只有一个产品fs100,它对应的配置文件在当前目录下的fs100.mk。
5. 在产品配置文件里添加最基本信息

PRODUCT_PACKAGES := \
    IM \
    VoiceDialer
$(call inherit-product, build/target/product/generic.mk)  ##从某一默认配置开始派生余下内容参考派生起点
# Overrides
PRODUCT_MANUFACTURER := farsight
PRODUCT_NAME := fs100
PRODUCT_DEVICE := fs100

除了编译和定义产品相关环境变量外,还需要定义Board相关环境变量

总结:
build/core/main.mk   包含了config.mk,它主要定义了编译全部代码的依赖关系
build/core/config.mk 定义了大量的编译脚本命令,编译时用到的环境变量,引入了envsetup.mk 文件,加载board相关配置文件。
build/core/envsetup.mk   定义了编译时用到的大量OUT输出目录,加载product_config.mk文件
build/core/product_config.mk 定义了Vendor目录下Product相关配置文件解析脚本,读取AndrodProducts.mk生成TARGET_DEVICE变量
      build/target/product          product config
      build/target/board            board config
      build/core/combo             build flags config 
这里解释下这里的board和product。borad主要是设计到硬件芯片的配置,比如是否提供硬件的某些功能,比如说GPU等等,或者芯片支持浮 点运算等等。product是指针对当前的芯片配置定义你将要生产产品的个性配置,主要是指APK方面的配置,哪些APK会包含在哪个product中, 哪些APK在当前product中是不提供的。
config.mk是一个总括性的东西,它里面定义了各种module编译所需要使用的HOST工具以及如何来编译各种模块,比如说 BUILT_PREBUILT就定义了如何来编译预编译模块。envsetup.mk主要会读取由envsetup.sh写入环境变量中的一些变量来配置编译过程中的输出目录,combo里面主要定义了各种Host和Target结合的编译器和编译选项。


2.4 mm流程

当我们单独编译某个模块时,在这个模块目录下输入mm命令进行编译,在build/envsetup.sh看一下具体实现过程:

function mm()

{

local T=$(gettop)

local DRV=$(getdriver $T)

# If we're sitting in the root of the build tree, just do a

# normal build.

if [ -f build/soong/soong_ui.bash ]; then

_wrap_build $DRV $T/build/soong/soong_ui.bash --make-mode $@

else

ONE_SHOT_MAKEFILE=$M _wrap_build $DRV $T/build/soong/soong_ui.bash --make-mode $MODULES $ARGS

流程上同make差不多只不过目标,是单独模块组成。

同时在mm一个单独模块是,生成独立的ninja文件

combined--aosp_arm-frameworks_native_libs_gui_Android.mk.ninja 和

build- aosp_arm-frameworks_native_libs_gui_Android.mk.ninja

2.3 Soong流程

在介绍soong编译流程之前,先介绍几个命令以便我们后续编译流程的理解,在out/soong/host/linux-x86/bin目录下,有几个命令是soong用到的,

soong_ui: soong编译的入口

androidmk: 后面的Android.bp用到,Android.mk一键转换为android.bp

在out/soong/.bootstrap/bin目录下有几个

out/soong/.bootstrap/bin$ ls

bpglob gotestmain gotestrunner loadplugins minibp soong_build soong_env

minibp: 在bootstrap是用到

soong_build :这个很重要,主要是将bp文件转换为ninja文件

通过上文的分析,当我们make命令敲下去的时候,主要是执行

prebuilts/build-tools/$(host_prebuilts)/bin/makeparallel --ninja build/soong/soong_ui.bash --make-mode $(MAKECMDGOALS)

soong_ui.bash脚本主要是执行如下:

build_go soong_ui android/soong/cmd/soong_ui //生成soong_ui命令

cd ${TOP}

exec "$(getoutdir)/soong_ui" "$@" //soong_ui入口,执行soong流程

比如我们执行make systemimage,到这边就变成了soong_ui –make-mode systemimage

soong_ui代码在build/soong/cmd/soong_ui/main.go 下,主要流程如下:

func main() {

log := logger.New(os.Stderr)

defer log.Cleanup()

if len(os.Args) < 2 || !inList("--make-mode", os.Args) {

log.Fatalln("The `soong` native UI is not yet available.")

}

build.Build(buildCtx, config, build.BuildAll)

主要执行soong/ui/build/build.go,从build.go就可以看到执行soong的大体流程

看一下各个流程

Step 1: runMakeProductConfig 主要配置编译参数

Step 2: runSoongBootstrap 这个主要是为后面编译工具的使用 ckati soong做环境搭建

runSoong 对工具进行编译

/.minibootstrap/build.ninja

- Run minibp to generate .bootstrap/build.ninja (Primary stage) - Run minibp to generate .minibootstrap/build.ninja.in

/.bootstrap/build.ninja

- Build any bootstrap_go_binary rules and dependencies -- usually the primary builder and any build or runtime dependencies. - Run the primary builder to generate build.ninja

同时还会生成out/soong/build.ninja

Step 3: 运行step2生成的ckati,搜集所有的Android.mk文件生成ninja文件,也就是前面提到的 out/build-aosp_arm.ninja

Step4: 将out/soong/build.ninja 和out/build-aosp_arm.ninja 合成为combined-aosp_arm.ninja

Step5: 运行runNinja 解释combined-aosp_arm.ninja 运行编译过程

三 ninja使用

  我们可以使用ninja 和生成的combined-aosp_arm.ninja 编译工程或者某一个module.

$ ./prebuilts/build-tools/linux-x86/bin/ninja -f out/combined-aosp_arm.ninja

同在工程中make一个效果

编译systemimage或者bootimage

$ ./prebuilts/build-tools/linux-x86/bin/ninja -f out/combined-aosp_arm.ninja  systemimage

上面这样做的目的是,不用重新生成ninja文件,直接进行编译,节省部分时间。这是在没有修改Makefile的前提

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