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related guide药品服务许可证(京)-经营-违法不良信息举报: 电话、邮箱youkujubao@service.alibaba.com请使用者仔细阅读优酷、、、、和Copyright(C)2018 优酷 youku.com 版权所有NDK升级遇到的一些问题汇总
作者： Sam (甄峰)& sam_
之前每次升级NDK，均会遇到或大或小的问题，常见的问题有：NDK下的C库，C++库与Android设备内的库不匹配等。但这次从android-ndk-r10e
升级到android-ndk-r14b.
却遇到不少有特色的问题。记录如下：
1. 在Amlogic AArch64--S905X平台：
Android版本：6.0.1
Kernel版本：3.14.29
这个平台虽然是64bit平台。但烧入的Image中，包含的库却是32bit.
使用NDK-r10e编译的C程序，C++程序，均可正常运行。
使用NDK-r14b编译的C程序。C++程序，32Bit下，clang/GCC编译的均正常运行。
使用NDK-r14b编译的C程序，C++程序， 64Bit下，均无法正常运行。(这也符合预期)
2. 在另一个Amlogic AArch64盒子--NEXBOX-A95X：
Android版本：6.0.1
这个平台虽然是64bit平台。但烧入的Image中，包含的库却是32bit.
使用NDK-r10e编译的C程序，C++程序，均可正常运行。
使用NDK-r14b编译的C程序。C++程序，32Bit下，clang/GCC编译的均正常运行。
使用NDK-r14b编译的C程序，C++程序， 64Bit下，均无法正常运行。(这也符合预期)
3. Amlogic S905 32bit--中兴媚盒2:
使用NDK-r10e编译的C程序，C++程序，均可正常运行。
使用NDK-r14b编译的C程序。C++程序，32Bit下，clang/GCC编译的均正常运行。
使用NDK-r14b编译的C程序，C++程序， 64Bit下，均无法正常运行。(这也符合预期)
4. RK3288 32Bit:
Android版本：5.1.1
Kernel版本：３.10.0
使用NDK-r10e编译的C程序，C++程序，均可正常运行。
使用NDK-r14b编译的C程序。C++程序，32Bit下，clang/GCC编译的均正常运行。但只要是r14b编译的ELF(不管可执行程序还是动态库)，均会在运行时报错如下：
WARNING: linker:&
&./Test_NDK: unused DT Entry: type 0x6ffffffe arg
WARNING: linker:&
&./Test_NDK: unused DT Entry: type 0x6fffffff arg
WARNING: linker:&
&libV4L2_utils.so: unused DT Entry: type
WARNING: linker:&
&libV4L2_utils.so:&&unused
DT Entry: type.....
WARNING: linker:&
&libgnustl_shared.so: unused DT Entry: type
WARNING: linker:&
&libgnustl_shared.so:&&unused
DT Entry: type.....
看到DT Entry， 感觉是ELF内的东西。可为何R14编译的东西，会在RK3288上报这个警告呢？
DT Entry: 用来在ELF文件头中描述Array Entry.
可执行程序和库会需要一些Dynamic Array Tags(DT). 但并不是所有的Entry是必需的，也有些已经不可用。
有哪些以及哪些DT Entry可用， 依赖于具体处理器和指令集。
所以：这个Warning的出现，原因是有DT Entry编译入了可执行程序或动态库，但Kernel却表示不支持。
导致的原因：
1. ARM Kernel交叉编译时，用到错误的Flags。 通常指不正确的处理器指令集。
2. ARM可执行程序或动态库使用了已经弃用的编译选项。
从Android 5.1(API 22)开始, Android Linker对VERNEED和VERNEEDNUM ELF
dynamic section报警。
type 0x6ffffffe，&type
0x6fffffff正是它俩。
察看那个API版本关心那些DT，可以看NDK/platfomrs/android-xx/arch-xxx/usr/include/linux/elf.h
察看某个可执行程序或动态库有哪些DT：
#readelf --dynamic& Test_NDK
可以看到，其中包含：
0x6ffffffe (VERNEED)& 0xce8
0x6fffffff& (VERNEEDNUM) 1
就是他们导致警告。
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