Ubuntu上交叉编译valgrind for Android 4.0.4的过程与注意事项
编译环境：Ubuntu x86_64（Linux root 2.6.32-45-generic #101-Ubuntu SMP Mon Dec 3 15:39:38 UTC 2012 x86_64 GNU/Linux）
运行环境：Android 4.0.4 （Linux kernel 3.0.21 OMAP4460）
一、下载NDK9和valgrind 3.8.1。
二、按照valgrind 3.8.1中的README.android进行编译，步骤如下：
1. 指定NDK根目录
export NDKROOT=/path/to/android-ndk-r9
2. 指定通用的安卓设备
export HWKIND=generic
3. 指定交叉工具链路径
export AR=$NDKROOT/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar
export LD=$NDKROOT/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ld
export CC=$NDKROOT/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
4. 到valgrind目录下配置valgrind
cd /path/to/valgrind
CPPFLAGS="--sysroot=$NDKROOT/platforms/android-3/arch-arm -DANDROID_HARDWARE_$HWKIND"
CFLAGS="--sysroot=$NDKROOT/platforms/android-3/arch-arm"
./configure --prefix=/data/local/valgrind --host=armv7-unknown-linux --target=armv7-unknown-linux --with-tmpdir=/sdcard
注：配置这步经常报错，前面的路径等设置需要细心啊。
5. 编译并安装到指定路径
make -j2
make -j2 install DESTDIR=`pwd`/Inst
注：-j2表示利用双核提升编译速度，对速度不在乎的可以去掉。
三、安卓上运行
1. 拷贝Inst到安卓系统/data/local/valgrind中。
注：假如路径不是编译配置时的路径，这时需要重新设置一下，否则会报错。“valgrind: failed to start tool 'memcheck' for platform 'arm-linux': No such file or directory”
export VALGRIND_LIB=/data/local/valgrind/lib/valgrind/
2. 安卓4.0.4下（OMAP4460）执行Memcheck效果
127|shell@android:/data/local # /data/local/valgrind/bin/valgrind ls
==3509== Memcheck, a memory error detector
==3509== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3509== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==3509== Command: ls
==3509==
--3509-- WARNING: Serious error when reading debug info
--3509-- When reading debug info from /data/local/valgrind/lib/valgrind/vgpreload_core-arm-linux.so:
--3509-- Can't make sense of .data section mapping
test
tmp
==3509==
==3509== HEAP SUMMARY:
==3509== in use at exit: 4,096 bytes in 1 blocks
==3509== total heap usage: 5 allocs, 4 frees, 8,337 bytes allocated
==3509==
==3509== LEAK SUMMARY:
==3509== definitely lost: 0 bytes in 0 blocks
==3509== indirectly lost: 0 bytes in 0 blocks
==3509== possibly lost: 0 bytes in 0 blocks
==3509== still reachable: 4,096 bytes in 1 blocks
==3509== suppressed: 0 bytes in 0 blocks
==3509== Rerun with --leak-check=full to see details of leaked memory
==3509==
==3509== For counts of detected and suppressed errors, rerun with: -v
==3509== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
shell@android:/data/local #
3. 安卓4.0.4下（OMAP4460）执行callgrind步骤
/data/local/valgrind/bin/valgrind --tool=callgrind ./test
执行完成后在目录下生成"callgrind.out.XXX"（XXX是进程ID号）是分析文件，可以直接利用：/data/local/valgrind/bin/callgrind_annotate callgrind.out.XXX 打印结果；
也可以在Ubuntu上使用：gprof2dot.py -f callgrind callgrind.out.XXX |dot -Tpng -o report.png 来生成图形化结果（需下载gprof2dot.py脚本，详见参考资料3）。
注：
1、使用callgrind时，./test程序运行时间短(<2s)，运算量小的可以正常执行callgrind；而当test程序运行时间较长(>6S)，运算量较大时，会导致安卓系统不稳定，无法正确执行下去，估计valgrind对安卓的兼容性较差吧。
参考资料：
1. http://blog.csdn.net/21cnbao/article/details/7399863 宋宝华 使用valgrind检测Android native程序的内存
2. http://blog.csdn.net/gxh9314/article/details/8447559 mips 交叉编译valgrind
3. http://blog.csdn.net/yanghao23/article/details/7514587 linux下利用valgrind工具进行内存泄露检测和性能分析
