安卓so版本ndk版本查看以及strip命令的使用

2024-06-03 17:18| 来源: 网络整理| 查看: 265

安卓so库对应的ndk版本查看以及strip命令的使用

本人的电脑为mac，所以只谈mac

使用file命令 file libc++_shared.so

输出：

libc++_shared.so: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=e2abf2cdb6028797b0eae31bedb64809ae86fed1, with debug_info, not stripped

可以看到该so库为64位，含有调试信息

使用readelf查看ndk版本如何找到readelf命令？请至android sdk根目录，比如我的mac上sdk根目录是在/Users/admin/Library/Android/sdk admin@C02D7132MD6R sdk % pwd /Users/admin/Library/Android/sdk

cd到sdk根目录开始使用find命令查找，因为我要查找64位的，所以就使用grep过滤了以下

find . -name "*readelf"｜grep arch64 ./ndk/17.2.4988734/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/17.2.4988734/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf ./ndk/16.1.4479499/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/16.1.4479499/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf ./ndk/22.0.7026061/toolchains/llvm/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/22.0.7026061/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf ./ndk/22.0.7026061/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/22.0.7026061/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf ./ndk/21.0.6113669/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf ./ndk/21.0.6113669/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-readelf

当前我的ndk版本有16，17，21，22，我习惯用最新的readelf命令，从上可知ndk22下面的readelf命令其实都是可用的，随便选择一个：

执行readelf命令，查看so库的ndk版本 ./ndk/22.0.7026061/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/aarch64-linux-android/bin/readelf -p ".comment" libc++_shared.so String dump of section '.comment': [ 0] Android (5900059 based on r365631c) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 207d7abc1a2abf3ef8d4301736d6a7ebc224a290) (based on LLVM 9.0.8svn) [ b4] GCC: (GNU) 4.9.x 20150123 (prerelease)

Clang version 9.0.8对应的ndk版本其实就是ndk21，我们可以验证一下

验证clang版本与ndk的对应关系

1.使用find命令，查找当前sdk根目录下面的所有clang可执行文件

admin@C02D7132MD6R sdk % find . -name clang |grep bin ./ndk/17.2.4988734/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang ./ndk/16.1.4479499/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang ./ndk/22.0.7026061/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang ./ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang

2.先看看ndk16的clang版本为多少呢？ Android clang version 5.0.300080

admin@C02D7132MD6R sdk % ./ndk/16.1.4479499/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang -v Android clang version 5.0.300080 (based on LLVM 5.0.300080) Target: x86_64-apple-darwin19.6.0 Thread model: posix InstalledDir: /Users/admin/Library/Android/sdk/./ndk/16.1.4479499/toolchains/llvm/prebuilt/darwin-x86_64/bin

3.再看看ndk21的clang版本为多少？Android (5900059 based on r365631c) clang version 9.0.8

admin@C02D7132MD6R sdk % ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang -v Android (5900059 based on r365631c) clang version 9.0.8 (https://android.googlesource.com/toolchain/llvm-project 207d7abc1a2abf3ef8d4301736d6a7ebc224a290) (based on LLVM 9.0.8svn) Target: x86_64-apple-darwin19.6.0 Thread model: posix InstalledDir: /Users/admin/Library/Android/sdk/./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin

所以本人测试所用的libc++_shared.so为ndk21对应的so库

使用strip命令将调试信息清除，减小so库大小如何在sdk根目录找到strip命令

同样的在sdk根目录中去搜索

admin@C02D7132MD6R sdk % find . -name "*-strip" |grep arch64 ./ndk/17.2.4988734/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk/16.1.4479499/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk/22.0.7026061/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk/22.0.7026061/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk/21.0.6113669/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip ./ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip

找到后可使用ndk21下面的strip命令

admin@C02D7132MD6R sdk % ./ndk/21.0.6113669/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-strip -s libc++_shared.so -o libc++_shared.so.strip

再次使用file命令查看libc++_shared.so.strip文件信息

admin@C02D7132MD6R sdk % file libc++_shared.so.strip libc++_shared.so.strip: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, BuildID[sha1]=e2abf2cdb6028797b0eae31bedb64809ae86fed1, stripped

我们看看strip前后文件的大小

admin@C02D7132MD6R sdk % ls -al libc++* -rw-r--r-- 1 admin staff 6245712 3 15 13:20 libc++_shared.so -rwxr-xr-x 1 admin staff 919888 3 15 13:42 libc++_shared.so.strip

是不是strip后文件大小小了许多呢

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