编译安卓系统9.0源码

1. 准备环境

PC
- 系统：Mac OSX 10.14.4 (18E226)
- 至少250GB固态硬盘
- JDK 1.8.0_171
- Xcode 10 SDK
- Android SDK
Mobile
- 设备: Google Pixel

2. 配置环境

2.1 创建大小写敏感的磁盘镜像


# 可以通过磁盘管理工具进行设置，也可以通过以下命令生成250g的镜像文件
$ hdiutil create -type SPARSE -fs 'Case-sensitive Journaled HFS+' -size 250g -volname android android.dmg

android.dmg 表示当前目录下生成android.dmg.sparseimage

2.2 将镜像文件转为可读写磁盘


# 稍微会等一会，我的移动硬盘
# 已耗时： 6m 10.512s
# 速度：414.6M 字节/秒
$ hdiutil convert android.dmg.sparseimage -format UDRW -o android.dmg

PS: 创建镜像的目的是方便移动，大文件移动挺快。无所谓的可以直接在大小写敏感的硬盘(磁盘管理工具格式化为大小写敏感)上直接操作，省去这一步。


# 查询当前目录所在分区的分区是否大小写敏感
$ diskutil info . | grep Name

3.下载源码

3.1 下载repo工具并且给这个工具可执行权限


$ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo -O repo & chmod +x repo

3.2 源码地址


# 推荐使用清华大学TUNA镜像源，使用每月更新的初始化包进行下载更新。具体步骤请看

https://mirror.tuna.tsinghua.edu.cn/help/AOSP/

3.3 同步分支android-9.0.0_r36源码，需要获取所有源码可以先repo sync，然后再切换分支(我获取的所有源码，编译+源码总共200GB)


# 查看可切换的分支 
$ cd .repo/manifests 
$ git branch -a | cut -d / -f 3 
# 切换到9.0分支
$ repo init -b android-9.0.0_r36
# long time ..., 报错继续repo sync
$ repo sync
# 直到显示下面内容，即为同步完成
Syncing work tree:100%,done.

同步源码报错，其他依赖环境貌似我这之前装过，没遇到其他错误


warning: gpg (GnuPG) is not available.
warning: Installing it is strongly encouraged.
# 解决方法：
$ brew install gpg

4. 编译源码

4.1 首先进入bash环境
```
$ bash
```

4.2 初始化编译环境


bash-5.0$ source build/envsetup.sh
including device/generic/car/vendorsetup.sh
including device/generic/mini-emulator-arm64/vendorsetup.sh
including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
including device/generic/mini-emulator-mips/vendorsetup.sh
including device/generic/mini-emulator-mips64/vendorsetup.sh
including device/generic/mini-emulator-x86/vendorsetup.sh
including device/generic/mini-emulator-x86_64/vendorsetup.sh
including device/generic/uml/vendorsetup.sh
including device/google/crosshatch/vendorsetup.sh
including device/google/cuttlefish/vendorsetup.sh
including device/google/marlin/vendorsetup.sh
including device/google/muskie/vendorsetup.sh
including device/google/taimen/vendorsetup.sh
including device/linaro/hikey/vendorsetup.sh
including sdk/bash_completion/adb.bash

4.3 配置编译信息
访问https://developers.google.com/android/images得到对应设备的combo名称，这里Pixel对应sailfish

这里执行lunch后输入45，或者输入aosp_sailfish-userdebug


$ lunch
You're building on Darwin

Lunch menu... pick a combo: 
   ...
   45. aosp_sailfish-userdebug
   ...
Which would you like? [aosp_arm-eng] 45
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=9
TARGET_PRODUCT=aosp_sailfish
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_ARCH=arm64
TARGET_ARCH_VARIANT=armv8-a
TARGET_CPU_VARIANT=kryo
TARGET_2ND_ARCH=arm
TARGET_2ND_ARCH_VARIANT=armv8-a
TARGET_2ND_CPU_VARIANT=kryo
HOST_ARCH=x86_64
HOST_2ND_ARCH=x86
HOST_OS=darwin
HOST_OS_EXTRA=Darwin-18.5.0-x86_64-10.14.4
HOST_BUILD_TYPE=release
BUILD_ID=PQ3A.190505.001
OUT_DIR=out
============================================

BUILD_ID=PQ3A.190505.001
这里提前把BUILD_ID对应的设备驱动下载好，访问https://developers.google.com/android/drivers得到Pixel binaries for Android 9.0.0 (PQ3A.190505.001)的两个驱动，解压后放入源码目录下解压。解压后再执行对应的sh脚本即可。（用于编译好源码后，线刷安卓系统到Pixel手机上。）

PS: 执行shell脚本时需要同意协议，^ + c 快捷键可以快速跳过协议阅读，直接弹出同意协议输入位置。

4.4 开始构建

脚本（ccache.sh）


 #!/usr/bin/env bash 
 export USE_CCACHE=1 #开启CCACHE。此配置可以提高二次全编译的速度。可以添加到.bashrc文件中，
 export CCACHE_DIR=./.ccache #设置缓存目录的路径。也可以添加到.bashrc文件中，
 # prebuilts/misc/linux-x86/ccache/ccache -M 50G #设置缓存目录的大小。这个配置一次即可。
 prebuilts/misc/darwin-x86/ccache/ccache -M 50G #设置缓存目录的大小。这个配置一次即可。


# 启动ccache缓存
$ sh ccache.sh
# 开40个线程编译，等待编译完成
$ make -j40

遇到的报错


# 找不到jdk，这个在根目录的.bash_profile文件中添加

解决方法：
export ANDROID_JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_171.jdk/Contents/Home


 # 报错找不到对应的MacOSX.sdk,比如找不到MacOSX10.13.sdk
============================================
[1/1] out/soong/.minibootstrap/minibp out/soong/.bootstrap/build.ninja
[55/56] glob prebuilts/ndk/stl.bp
[77/77] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
FAILED: out/soong/build.ninja
out/soong/.bootstrap/bin/soong_build -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/build.ninja.d -o out/soong/build.ninja Android.bp
internal error: Could not find a supported mac sdk: ["10.10" "10.11" "10.12" "10.13"]
ninja: build stopped: subcommand failed.
11:57:25 soong bootstrap failed with: exit status 1

#### failed to build some targets (16 seconds) ####

解决方法：下载Mac OSX SDK，Clone下来复制MacOSX10.13.sdk到目录/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs下（我测试的10.13版本，其他版本自测）


  # 报错sdm710 target not found
[1/1] out/soong/.minibootstrap/minibp out/soong/.bootstrap/build.ninja
FAILED: out/soong/.bootstrap/build.ninja
out/soong/.minibootstrap/minibp -t -l out/.module_paths/Android.bp.list -b out/soong -n out -d out/soong/.bootstrap/build.ninja.d -o out/soong/.bootstrap/build.ninja Android.bp
internal error: could not open symlink hardware/qcom/sdm710/Android.bp; its target (display/os_pickup.bp) cannot be opened
ninja: build stopped: subcommand failed.
11:02:11 soong minibootstrap failed with: exit status 1

#### failed to build some targets (1 seconds) ####

解决方法：git clone 该链接的目录文件到hardware/qcom/sdm710目录下（全部clone）
https://android.googlesource.com/platform/hardware/qcom/sdm710/

4.5 编译完成
#### build completed successfully (25 seconds) ####

5. 修改源码

5.1 去掉wifi感叹号


// 去掉感叹号
// 进入文件夹
// /Volumes/sandisk/aosp/frameworks/base/services/core/java/com/android/server/connectivity/NetworkMonitor.java
// 修改地址链接为如下
    // private static final String DEFAULT_HTTPS_URL     = "https://www.google.com/generate_204";
    private static final String DEFAULT_HTTPS_URL     = "https://www.qualcomm.cn/generate_204";
    private static final String DEFAULT_HTTP_URL      =
            // "http://connectivitycheck.gstatic.com/generate_204";
            "http://www.qualcomm.cn/generate_204";
    // private static final String DEFAULT_FALLBACK_URL  = "http://www.google.com/gen_204";
    private static final String DEFAULT_FALLBACK_URL  = "http://www.qualcomm.cn/generate_204";
    private static final String DEFAULT_OTHER_FALLBACK_URLS =
            // "http://play.googleapis.com/generate_204";
            "http://www.qualcomm.cn/generate_204";

5.2 默认adb为root

ro.secure=0即可


/Volumes/sandisk/aosp/build/make/core/main.mk

## user/userdebug ##

user_variant := $(filter user userdebug,$(TARGET_BUILD_VARIANT))
enable_target_debugging := true
tags_to_install :=
ifneq (,$(user_variant))
  # Target is secure in user builds.
  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
  ADDITIONAL_DEFAULT_PROPERTIES += security.perf_harden=1

  ifeq ($(user_variant),user)
    ADDITIONAL_DEFAULT_PROPERTIES += ro.adb.secure=0
  endif

  ifeq ($(user_variant),userdebug)
    # Pick up some extra useful tools
    tags_to_install += debug
  else
    # Disable debugging in plain user builds.
    enable_target_debugging :=
  endif

  # Disallow mock locations by default for user builds
  ADDITIONAL_DEFAULT_PROPERTIES += ro.allow.mock.location=1

else # !user_variant
  # Turn on checkjni for non-user builds.
  ADDITIONAL_BUILD_PROPERTIES += ro.kernel.android.checkjni=1
  # Set device insecure for non-user builds.
  ADDITIONAL_DEFAULT_PROPERTIES += ro.secure=0
  # Allow mock locations by default for non user builds
  ADDITIONAL_DEFAULT_PROPERTIES += ro.allow.mock.location=1
endif # !user_variant

5.3 修改默认输入法（参考其他文章）

在/Volumes/sandisk/aosp/frameworks/base/packages/SettingsProvider/res/values/defaults.xml添加如下内容：


com.google.android.inputmethod.pinyin/.PinyinIME
com.google.android.inputmethod.pinyin/.PinyinIME

在/Volumes/sandisk/aosp/frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java方法内添加如下内容：


loadStringSetting(stmt, Secure.ENABLED_INPUT_METHODS,
                    R.string.def_default_input_method);

在/Volumes/sandisk/aosp/packages/apps/创建GoogleInput文件夹，进入GoogleInput创建Android.mk文件，添加如下内容：

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := GoogleInput
LOCAL_MODULE_TAGS := optional
LOCAL_SRC_FILES := $(LOCAL_MODULE).apk
LOCAL_MODULE_CLASS := APPS
LOCAL_MODULE_SUFFIX := $(COMMON_ANDROID_PACKAGE_SUFFIX)
LOCAL_CERTIFICATE := PRESIGNED
include $(BUILD_PREBUILT)
LOCAL_MULTILIB := 64

将GoogleInput.apk放入该目录下

在build/make/target/product/core.mk文件中修改如下：

PRODUCT_PACKAGES += \
移除Latin \
末尾新增GoogleInput

编译模块：


# 编译系统镜像
$ mmm packages/apps/GoogleInput/
$ make snod

5.4 修改系统名称

修改/device/google/marlin/aosp_sailfish.mk文件内容为：


PRODUCT_MODEL := Pixel