环境 ubuntu 18.04
一 安装所需依赖
sudo apt-get install git-core gnupg flex bison build-essential zip curl zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 libncurses5 lib32ncurses5-dev x11proto-core-dev libx11-dev lib32z1-dev libgl1-mesa-dev libxml2-utils xsltproc unzip fontconfig 参照官方文档
二 JDK环境
sudo apt-get install openjdk-8-jdk
sudo vim /etc/profile
追加
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH三? 编译过程中的错误处理
1? flex-2.5.39: loadlocale.c:130:_nl_intern_locale_data: ?? ‘cnt < (sizeof (_nl_value_type_LC_TIME) / sizeof (_nl_value_type_LC_TIME[0]))’ ???
Aborted (core dumped)
解决办法：
在～/.bashrc最后添加export LC_ALL=C? ? ?(? 去除本地C化，使得Android的编译工具与本地工具不冲突。)
然后 source ～/.bashrc
// 注意恢复?export LC_ALL=C
2 Jack server failed to (re)start, try 'jack-diagnose' or see Jack server log
SSL error when connecting to the Jack server. Try 'jack-diagnose'
SSL error when connecting to the Jack server. Try 'jack-diagnose'
[ 29% 9406/31906] target thumb C++: libandroid_runtime <= frameworks/base/core/jni/android/graphics/pdf/PdfEditor.cpp
In file included from external/pdfium/core/include/fpdfapi/fpdf_module.h:10:0,
解决办法：
Remove TLSv1, TLSv1.1 from jdk.tls.disabledAlgorithms in /etc/java-8-openjdk/security/java.security file
Restart the jack server: cd /prebuilts/sdk/tools/ ./jack-admin kill-server ./jack-admin start-server?
?
3 Out of memory
Out of memory error (version 1.2-rc4 'Carnac' (298900 f95d7bdecfceb327f9d201a1348397ed8a843843 by android-jack-team@google.com)).
GC overhead limit exceeded.
Try increasing heap size with java option '-Xmx'.
fix
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m"
./prebuilts/sdk/tools/jack-admin kill-server
./prebuilts/sdk/tools/jack-admin start-server?
四 编译 Android??Soong 编译系统?
使用?envsetup.sh?脚本初始化环境：
source build/envsetup.sh
选择目标
lunch
使用?lunch?选择要构建的目标。lunch?product_name-build_variant?会选择?product_name?作为需要构建的产品，并选择?build_variant?作为需要构建的变体，然后将这些选择存储在环境中，以便供后续对?m?和其他类似命令的调用读取。
lunch aosp_arm-eng
make -j8? ? ? ?
//? ? m (make systemimage)? mm mma
make：根据lunch选项，编译Android系统，最后产出为：system.img，ramdisk.img，userdate.img
m：和make命令一样
mm：从当前目录下开始向下编译目标
mmm：指定一个目录，仅编译指定目录下的目标
make snod：只将out/target/product/XXX/system/目录下的内容打包生成system.img，不会检查依赖关系
make bootimage：只将out/target/product/XXX/root/目录下的内容打包生成ramdisk.img
//编译生成 system.img? userdata.img ramdisk.img?
