简单介绍

下载Android7.1.1源代码花费了两天，编译整个源代码相同花费了2天，期间遇到无数个坑。

如今编译源代码，一旦中间遇到错误，则要又一次開始。

本文记录编译过程遇到的问题及解决方式，如有编译源代码需求的能够參考本文先把这些坑跳过然后再编译,Mac环境为10.12.4.

编译步骤

直接參考官方指导就可以https://source.android.com/source/initializing.html

这些步骤当中暗含深坑，以下将一一讲解.

问题1–Mac上大写和小写不敏感

在Mac上默认是大写和小写不敏感的。即你新建个a目录和A目录。两者会觉得是一个目录，不让其创建第二个A。

因为不舍得在笔记本上开40G空间。我是在移动硬盘上建了个50G的dmg，然后挂载到/Volumes/android路径下。

能够按官方网档用命令建dmg，也能够用自带的磁盘工具来完毕。打开磁盘工具，然后点击文件–新建:



接着把格式选成Mac OS扩展(区分大写和小写,日志式)



建好符合格式要求的dmg后，把源代码复制到/Volumes/android就能够了.

问题2–JDK版本号问题

编译前请检查JDK版本号，看官网上的说明:

Java Development Kit (JDK)

Please note, since there are no available supported OpenJDK 8 packages for Ubuntu 14.04, the Ubuntu 15.04 packages must be installed manually. See JDK for Ubuntu LTS 14.04 for precise instructions.

The master branch of Android in AOSP: Ubuntu - OpenJDK 8, Mac OS - jdk 8u45 or newer

Android 5.x (Lollipop) - Android 6.0 (Marshmallow): Ubuntu - OpenJDK 7, Mac OS - jdk-7u71-macosx-x64.dmg

Android 2.3.x (Gingerbread) - Android 4.4.x (KitKat): Ubuntu - Java JDK 6, Mac OS - Java JDK 6

Android 1.5 (Cupcake) - Android 2.2.x (Froyo): Ubuntu - Java JDK 5

在Mac OS上须要jdk 8u45之后的版本号。假设版本号低于这个，将会报一个错。我索性安装的最新的,直接1.8.0_112：

~ echo $JAVA_HOME

/Library/Java/JavaVirtualMachines/jdk1.8.0_112.jdk/Contents/Home

问题3–fatal error: linux/netfilter/xt_DSCP.h: No such file or directory

具体报错信息例如以下:

In file included from out/target/product/generic/obj/STATIC_LIBRARIES/libext4_intermediates/libipt_ECN.c:11:0:

external/iptables/extensions/../include/linux/netfilter_ipv4/ipt_ECN.h:13:37: fatal error: linux/netfilter/xt_DSCP.h: No such file or directory

 #include <linux/netfilter/xt_DSCP.h>

                                     ^

compilation terminated.

make: *** [out/target/product/generic/obj/STATIC_LIBRARIES/libext4_intermediates/libipt_ECN.o] Error 1

make: *** Waiting for unfinished jobs....

解决方法，在相应目录下新建xt_DSCP.h文件:

 /* based on ipt_FTOS.c (C) 2000 by Matthew G. Marsh <mgm@paktronix.com>

 * This software is distributed under GNU GPL v2, 1991

 *

 * See RFC2474 for a description of the DSCP field within the IP Header.

 *

 * xt_DSCP.h,v 1.7 2002/03/14 12:03:13 laforge Exp

*/

#ifndef _XT_DSCP_TARGET_H

#define _XT_DSCP_TARGET_H

#include <linux/netfilter/xt_dscp.h>

#include <linux/types.h>

/* target info */

struct xt_DSCP_info {

        __u8 dscp;

};

struct xt_tos_target_info {

        __u8 tos_value;

        __u8 tos_mask;

};

#endif /* _XT_DSCP_TARGET_H */

问题4–Unsupported curl

问题详情:

Unsupported curl, please use a curl not based on SecureTransport

Jack server installation not found

Unsupported curl, please use a curl not based on SecureTransport

Unsupported curl, please use a curl not based on SecureTransport

[ 27% 12844/46181] host Java: bouncycastle-host (out/host/common/obj/JAVA_LIBRARIES/bouncycastle-host_intermediates/classes)

须要又一次装curl:You need install a curl compiled with openssl

从http://curl.haxx.se/download.html下载。然后:

./configure --prefix=/usr/local/curl --with-ssl=/usr/local/Cellar/openssl/1.0.2d_1

make && make install

然后将/usr/local/curl/bin加入到PATH,通过一下验证是否安装好curl:

$ curl --version

curl 7.46.0 (x86_64-apple-darwin15.2.0) libcurl/7.46.0 OpenSSL/1.0.2d zlib/1.2.5

Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smb smbs smtp smtps telnet tftp

Features: IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP UnixSockets 

问题5–jack-admin Out of memory error

假设是默认设置的话。一定会遇到这个问题,具体log:

FAILED:Jack server failed to (re)start, try 'jack-diagnose' or see Jack server log

No Jack server running. Try 'jack-admin start-server'

……

ninja: build stopped: subcommand failed.

make[1]: *** [ninja_wrapper] Error 1

參考http://blog.csdn.net/luvzhan/article/details/53282968,解决方法编辑prebuilts/sdk/tools/jack-admin文件,在JACK_SERVER_COMMAND=“…… -cp ……” -cp前加入-Xmx7000m,（7000m为内存大小的一半左右，依据所用的主机配置而定）。

切记:之后再编译前一定要手动开启jack-admin start-server

也能够參考官网里的一段:

If you experience Jack compilations failing on Out of memory error.:

You can improve the situation by reducing the number of jack simultaneous compilations by editing your $HOME/.jack-server/config.properties and changing jack.server.max-service to a lower value and then restarting the server.

If this is not enough, you may change the arguments used to start the server jvm and force a greater maximum Java heap size (“-Xmx”):

Stop the server using jack-admin stop-server, then:

If you start the server manually:

JACK_SERVER_VM_ARGUMENTS="-Xmx2g -Dfile.encoding=UTF-8 -XX:+TieredCompilation" jack-admin start-server

If you use the jack server in the android tree then

export ANDROID_JACK_VM_ARGS="-Xmx2g -Dfile.encoding=UTF-8 -XX:+TieredCompilation"

and restart your build command.

其实这里是一个意思。我建议直接改动jack-admin文件.

问题6–error: 'syscall' is deprecated

在MacOSX10.11之后的平台上编译源代码会遇到这个问题，解决方法是从https://github.com/phracker/MacOSX-SDKs下载MacOSX10.11,

解压复制到/Applications/XCode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs。为了避免下次升级的时候再被删除，能够放到一个自己的目录(/Users/xu/work/git/MacOSX-SDKs/)，再给它创建一个软链接：

sudo ln -s /Users/xu/work/git/MacOSX-SDKs/MacOSX10.11.sdk /Applications/XCode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk

然后确保AOSP源代码下build/core/combo/mac_version.mk文件里

mac_sdk_versions_supported := 10.9 10.10 10.11

后面不要写10.12.

问题7–不要忘了下载驱动

假设你想将编译后的镜像安装到手机，编译源代码前不要忘了下载驱动:https://developers.google.com/android/blobs-preview或https://developers.google.com/android/drivers#angler下载。

编译核心命令

1. 手动开启jack-admin(尽量手动开启)

$ jack-admin kill-server

$ jack-admin start-server

1. 清空make clobber
2. 设置环境source build/envsetup.sh
3. 选择targetlunch
4. 開始编译make -j4

參考

1. http://blog.csdn.net/sinat_26227857/article/details/44078703
2. 问题4解决方法
3. 问题5 官网jack-admin
4. 问题5 csdn博客
5. 问题6