How to build android 2.3 source code

转载：http://easwy.com/blog/archives/compile-android-gingerbread-2-3-1/

前几天下载了Android 2.3.1的源代码并在Ubuntu 10.04(32位)上编译通过。这篇文章简要记录了下载、编译的过程。

关于搭建Android开发环境的文章已经有很多，本文只简要介绍一下，做为备忘。

[ 编译前的准备 ]

这一步安装获取源代码以及编译所需要的软件，使用如下命令：

$ sudo aptitude install git-core gnupg flex bison gperf libsdl-dev libesd0-dev libwxgtk2.6-dev build-essential zip curl libncurses5-dev zlib1g-dev

另外，参考别人编译Android 2.3的经验，安装了下列软件包：

$ sudo apt-get install lib64z1-dev libc6-dev-amd64 g++-multilib lib64stdc++6

虽然Android官方网站上讲不支持Java 6，不过我使用Java 6也可以编译通过，所以在这里Easwy安装的是Java 6。首先去掉/etc/apt/sources.list中这两行的注释，使能Java 6源：

deb http://archive.canonical.com/ubuntu lucid partner
deb-src http://archive.canonical.com/ubuntu lucid partner

然后安装Java 6 JDK：

$ sudo aptitude install sun-java6-jdk

接下来下载repo工具，这是Google提供的一个Python脚本，方便管理多个Git版本库：

$ cd ~
$ mkdir bin
$ curl http://android.git.kernel.org/repo >~/bin/repo
$ chmod a+x ~/bin/repo

记得把repo加到你的路径中，方便以后使用。编辑~/.bashrc，加入下面一行：

PATH=$PATH:~/bin
export PATH

然后用命令. ~/.bashrc，以后就可以直接使用repo命令了。

接下来获取Android 2.3.1的源代码：

$ mkdir mydroid
$ cd mydroid
$ repo init -u git://android.git.kernel.org/platform/manifest.git -b android-2.3.1_r1
$ repo sync

[ 编译Android ]

接下来开始编译：

$ make -j`grep '^processor' /proc/cpuinfo | wc -l`

上面的命令中，-j参数告诉make启动多个并行任务进行编译，在支持多核的CPU上能加快编译速度。如果你知道你CPU是几核的，可以直接把这部分替换成-j2(双核)。

我在编译的过程中遇到下面的错误：

    ************************************************************

    You are attempting to build on a 32-bit system.

    Only 64-bit build environments are supported beyond froyo/2.2.

    ************************************************************

这是因为在Makefile中检测了CPU的字长。我直接把build/core/main.mk中下面的话注释掉：

#ifneq (64,$(findstring 64,$(build_arch)))
#$(warning ************************************************************)
#$(warning You are attempting to build on a 32-bit system.)
#$(warning Only 64-bit build environments are supported beyond froyo/2.2.)
#$(warning ************************************************************)
#$(error stop)
#endif

接下来又遇到下面的错误：

    Docs droiddoc: out/target/common/docs/api-stubs

    Could not load ‘clearsilver-jni’

    java.library.path = out/host/linux-x86/lib

    make: *** [out/target/common/docs/api-stubs-timestamp] Error 45

    make: *** Waiting for unfinished jobs….

    Could not load ‘clearsilver-jni’

    java.library.path = out/host/linux-x86/lib

    make: *** [out/target/common/docs/doc-comment-check-timestamp] Error 45

这是由于clearsilver在编译时如果检测到使用Java JDK 6，就使用64位编译。要避开此错误，需要修改下面四个文件：

    * external/clearsilver/cgi/Android.mk
    * external/clearsilver/java-jni/Android.mk
    * external/clearsilver/util/Android.mk
    * external/clearsilver/cs/Android.mk

把这四个Makefile中的下列语句注掉即可：

# This forces a 64-bit build for Java6
# Comment by Easwy
# LOCAL_CFLAGS += -m64
# LOCAL_LDFLAGS += -m64

然后在external/clearsilver目录中执行一下make clean，然后回到项目根目录，继续make即可。

当编译完成时，生成的image文件放在out/target/product/generic目录中。

常见问题：
1:issue "You are attempting to build on a 32-bit system"

How to fix:
$ vim build/core/main.mk
change
ifneq (64,$(findstring 64,$(build_arch)))
to
ifneq (i686,$(findstring i686,$(build_arch)))
$(warning ************************************************************)
$(warning You are attempting to build on a 32-bit system.)
$(warning Only 64-bit build environments are supported beyond froyo/2.2.)
$(warning ************************************************************)
$(error stop)
endif


external/clearsilver/cgi/Android.mk,
external/clearsilver/java-jni/Android.mk,
external/clearsilver/util/Android.mk,
external/clearsilver/cs/Android.mk

change
LOCAL_CFLAGS += -m64
LOCAL_LDFLAGS += -m64
to
LOCAL_CFLAGS += -m32
LOCAL_LDFLAGS += -m32


2:issue "host C: libclearsilver-jni <= external/clearsilver/java-jni/j_neo_util.c
In file included from /usr/include/features.h:378,
                 from /usr/include/string.h:26,
                 from external/clearsilver/java-jni/j_neo_util.c:1:
/usr/include/gnu/stubs.h:9:27: error: gnu/stubs-64.h: 没有那个文件或目录
make: *** [out/host/linux-x86/obj/SHARED_LIBRARIES/libclearsilver- jni_intermediates/j_neo_util.o]错误"

How to fix:
sudo apt-get install lib64z1-dev libc6-dev-amd64 g++-multilib lib64stdc++6


3:issue:
host SharedLib: libneo_util (out/host/linux-x86/obj/lib/libneo_util.so)
/usr/bin/ld: skipping incompatible /usr/lib/gcc/i486-linux-gnu/4.3.4/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/i486-linux-gnu/4.3.4/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/i486-linux-gnu/4.3.4/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/i486-linux-gnu/4.3.4/libstdc++.a when searching for -lstdc++
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
make: *** [out/host/linux-x86/obj/lib/libneo_util.so] Error 1

How to fix:



4
frameworks/base/core/java/android/app/ListActivity.java:319: inconvertible types
found : android.widget.AdapterView<capture of ?>
required: android.widget.ListView
onListItemClick((ListView)parent, v, position, id);
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

How to fix:
其实JDK的版本低了，用了 1.5.0_06的版本，用1.6就可以了