Android：如何编译出能在android系统上使用的C++库

喜欢ヅ旅行 2022-03-28 04:09 675阅读 0赞

**目录**

一、下载Crypto++ 7.0原码

二、在Windows上安装Cygwin、Android-NDK、Android-SDK

三、在Cygwin中设置环境变量

四、修改setenv-android.sh文件

五、在Cygwin中生成环境变量

六、在Cygwin中生成库

--------------------

本文以Crypto++ 7.0为例，简单讲一下如何在Windows上编译出能在android系统上使用的C++库。

### 一、下载Crypto++ 7.0原码 ###

推荐下载地址：[https://github.com/weidai11/cryptopp/archive/CRYPTOPP\_7\_0\_0.zip][https_github.com_weidai11_cryptopp_archive_CRYPTOPP_7_0_0.zip]

解压后可以找到setenv-android.sh、GNUmakefile-cross等文件

### 二、在Windows上安装Cygwin、Android-NDK、Android-SDK ###

安装完成后，使用Android-NDK中的make\_standalone\_toolchain生成一个单独的toolchain  
Android-NDK安装目录：C:/Android/android-ndk-r16b  
单独的toolchain的生成目录：C:/Android/arm-linux-androideabi

### 三、在Cygwin中设置环境变量 ###

> export ANDROID\_NDK\_ROOT=/cygdrive/C/Android/android-ndk-r16b  
> export AOSP\_TOOLCHAIN\_PATH=/cygdrive/C/Android/arm-linux-androideabi/bin  
> export AOSP\_ABI=armeabi-v7a  
> export AOSP\_API\_VERSION=21

这些变量的值需要根据使用的系统环境做相应修改。

### 四、修改setenv-android.sh文件 ###

将AOSP\_TOOLCHAIN\_PATH=""注释掉，不然会报错

### 五、在Cygwin中生成环境变量 ###

执行source setenv-android.sh，运行结果如下：

> ANDROID\_NDK\_ROOT: /cygdrive/C/Android/android-ndk-r16b  
> AOSP\_TOOLCHAIN\_PATH: /cygdrive/C/Android/arm-linux-androideabi/bin  
> AOSP\_ABI: armeabi-v7a  
> AOSP\_API: android-21  
> AOSP\_SYSROOT: /cygdrive/C/Android/android-ndk-r16b/sysroot  
> AOSP\_LD\_SYSROOT: /cygdrive/C/Android/android-ndk-r16b/platforms/android-21/arch-arm  
> AOSP\_FLAGS: -D\_\_ANDROID\_API\_\_=21 -march=armv7-a -mfpu=neon -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti  
> AOSP\_SYS\_ARCH\_INC: /cygdrive/C/Android/android-ndk-r16b/sysroot/usr/include/arm-linux-androideabi  
> AOSP\_STL\_INC: /cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/include  
> AOSP\_STL\_LIB: /cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl\_shared.so  
> AOSP\_BITS\_INC: /cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include  
> CPU FEATURES: cpu-features.h and cpu-features.c are present
> 
> \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
> You are using GNU's runtime and STL library. Please ensure the resulting  
> binary meets licensing requirements. If you can't use GNU's runtime  
> and STL library, then reconfigure with stlport or llvm. Also see  
> http://code.google.com/p/android/issues/detail?id=216331  
> \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
> 
> \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*  
> It looks the the environment is set correctly. Your next step is build  
> the library with 'make -f GNUmakefile-cross'. You can create a versioned  
> shared object using 'HAS\_SOLIB\_VERSION=1 make -f GNUmakefile-cross'  
> \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*

### 六、在Cygwin中生成库 ###

由于命令不认识/cygdrive/C，所以重新设置AOSP\_SYSROOT

> export AOSP\_SYSROOT=C:/Android/arm-linux-androideabi/sysroot

执行make -f GNUmakefile-cross static shared

> arm-linux-androideabi-ar r libcryptopp.a cryptlib.o cpu.o integer.o 3way.o adler32.o algebra.o algparam.o arc4.o aria-simd.o aria.o ariatab.o asn.o authenc.o base32.o base64.o basecode.o bfinit.o blake2-simd.o blake2.o blowfish.o blumshub.o camellia.o cast.o casts.o cbcmac.o ccm.o chacha.o channels.o cmac.o crc-simd.o crc.o default.o des.o dessp.o dh.o dh2.o dll.o dsa.o eax.o ec2n.o eccrypto.o ecp.o elgamal.o emsa2.o eprecomp.o esign.o files.o filters.o fips140.o fipstest.o gcm-simd.o gcm.o gf256.o gf2\_32.o gf2n.o gfpcrypt.o gost.o gzip.o hex.o hmac.o hrtimer.o ida.o idea.o iterhash.o kalyna.o kalynatab.o keccak.o luc.o mars.o marss.o md2.o md4.o md5.o misc.o modes.o mqueue.o mqv.o nbtheory.o neon-simd.o network.o oaep.o osrng.o padlkrng.o panama.o pkcspad.o poly1305.o polynomi.o ppc-simd.o pssr.o pubkey.o queue.o rabin.o randpool.o rc2.o rc5.o rc6.o rdrand.o rdtables.o rijndael-simd.o rijndael.o ripemd.o rng.o rsa.o rw.o safer.o salsa.o scrypt.o seal.o seed.o serpent.o sha-simd.o sha.o sha3.o shacal2-simd.o shacal2.o shark.o sharkbox.o simon-simd.o simon.o skipjack.o sm3.o sm4.o socketft.o sosemanuk.o speck-simd.o speck.o square.o squaretb.o sse-simd.o strciphr.o tea.o tftables.o threefish.o tiger.o tigertab.o trdlocal.o ttmac.o tweetnacl.o twofish.o vmac.o wait.o wake.o whrlpool.o xtr.o xtrcrypt.o zdeflate.o zinflate.o zlib.o cpu-features.o  
> arm-linux-androideabi-ar: creating libcryptopp.a  
> arm-linux-androideabi-ranlib libcryptopp.a

> arm-linux-androideabi-g++ -shared  -o libcryptopp.so -DNDEBUG -g2 -O3 -fPIC -pipe -D\_\_ANDROID\_API\_\_=21 -march=armv7-a -mfpu=neon -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti -DANDROID --sysroot=C:/Android/arm-linux-androideabi/sysroot -Wa,--noexecstack -I/cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/include -I/cygdrive/C/Android/android-ndk-r16b/sysroot/usr/include/arm-linux-androideabi -I/cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -Wl,--exclude-libs,ALL cryptlib.o cpu.o integer.o 3way.o adler32.o algebra.o algparam.o arc4.o aria-simd.o aria.o ariatab.o asn.o authenc.o base32.o base64.o basecode.o bfinit.o blake2-simd.o blake2.o blowfish.o blumshub.o camellia.o cast.o casts.o cbcmac.o ccm.o chacha.o channels.o cmac.o crc-simd.o crc.o default.o des.o dessp.o dh.o dh2.o dll.o dsa.o eax.o ec2n.o eccrypto.o ecp.o elgamal.o emsa2.o eprecomp.o esign.o files.o filters.o fips140.o fipstest.o gcm-simd.o gcm.o gf256.o gf2\_32.o gf2n.o gfpcrypt.o gost.o gzip.o hex.o hmac.o hrtimer.o ida.o idea.o iterhash.o kalyna.o kalynatab.o keccak.o luc.o mars.o marss.o md2.o md4.o md5.o misc.o modes.o mqueue.o mqv.o nbtheory.o neon-simd.o network.o oaep.o osrng.o padlkrng.o panama.o pkcspad.o poly1305.o polynomi.o ppc-simd.o pssr.o pubkey.o queue.o rabin.o randpool.o rc2.o rc5.o rc6.o rdrand.o rdtables.o rijndael-simd.o rijndael.o ripemd.o rng.o rsa.o rw.o safer.o salsa.o scrypt.o seal.o seed.o serpent.o sha-simd.o sha.o sha3.o shacal2-simd.o shacal2.o shark.o sharkbox.o simon-simd.o simon.o skipjack.o sm3.o sm4.o socketft.o sosemanuk.o speck-simd.o speck.o square.o squaretb.o sse-simd.o strciphr.o tea.o tftables.o threefish.o tiger.o tigertab.o trdlocal.o ttmac.o tweetnacl.o twofish.o vmac.o wait.o wake.o whrlpool.o xtr.o xtrcrypt.o zdeflate.o zinflate.o zlib.o --sysroot=/cygdrive/C/Android/android-ndk-r16b/platforms/android-21/arch-arm /cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl\_shared.so  
> arm-linux-androideabi-g++: error: /cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl\_shared.so: No such file or directory  
> make: \*\*\* \[libcryptopp.so\] Error 1

从执行结果的最后几生中，可以看到libcryptopp.a生成成功，而libcryptopp.so生成失败。失败的原因就是由/cygdrive/C生成的，去掉/cygdrive/C以及多余的--sysroot，使用如下命令：

> arm-linux-androideabi-g++ -shared  -o libcryptopp.so -DNDEBUG -g2 -O3 -fPIC -pipe -D\_\_ANDROID\_API\_\_=21 -march=armv7-a -mfpu=neon -mfloat-abi=softfp -Wl,--fix-cortex-a8 -funwind-tables -fexceptions -frtti -DANDROID --sysroot=C:/Android/arm-linux-androideabi/sysroot -Wa,--noexecstack -I/cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/include -I/cygdrive/C/Android/android-ndk-r16b/sysroot/usr/include/arm-linux-androideabi -I/cygdrive/C/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/include -Wl,--exclude-libs,ALL cryptlib.o cpu.o integer.o 3way.o adler32.o algebra.o algparam.o arc4.o aria-simd.o aria.o ariatab.o asn.o authenc.o base32.o base64.o basecode.o bfinit.o blake2-simd.o blake2.o blowfish.o blumshub.o camellia.o cast.o casts.o cbcmac.o ccm.o chacha.o channels.o cmac.o crc-simd.o crc.o default.o des.o dessp.o dh.o dh2.o dll.o dsa.o eax.o ec2n.o eccrypto.o ecp.o elgamal.o emsa2.o eprecomp.o esign.o files.o filters.o fips140.o fipstest.o gcm-simd.o gcm.o gf256.o gf2\_32.o gf2n.o gfpcrypt.o gost.o gzip.o hex.o hmac.o hrtimer.o ida.o idea.o iterhash.o kalyna.o kalynatab.o keccak.o luc.o mars.o marss.o md2.o md4.o md5.o misc.o modes.o mqueue.o mqv.o nbtheory.o neon-simd.o network.o oaep.o osrng.o padlkrng.o panama.o pkcspad.o poly1305.o polynomi.o ppc-simd.o pssr.o pubkey.o queue.o rabin.o randpool.o rc2.o rc5.o rc6.o rdrand.o rdtables.o rijndael-simd.o rijndael.o ripemd.o rng.o rsa.o rw.o safer.o salsa.o scrypt.o seal.o seed.o serpent.o sha-simd.o sha.o sha3.o shacal2-simd.o shacal2.o shark.o sharkbox.o simon-simd.o simon.o skipjack.o sm3.o sm4.o socketft.o sosemanuk.o speck-simd.o speck.o square.o squaretb.o sse-simd.o strciphr.o tea.o tftables.o threefish.o tiger.o tigertab.o trdlocal.o ttmac.o tweetnacl.o twofish.o vmac.o wait.o wake.o whrlpool.o xtr.o xtrcrypt.o zdeflate.o zinflate.o zlib.o C:/Android/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl\_shared.so

就可以成功生成libcryptopp.so。

libcryptopp.a和libcryptopp.so就是可以在Android上使用的库。

参考文档

[Android (Command Line)][Android _Command Line]

[https_github.com_weidai11_cryptopp_archive_CRYPTOPP_7_0_0.zip]: https://github.com/weidai11/cryptopp/archive/CRYPTOPP_7_0_0.zip
[Android _Command Line]: https://www.cryptopp.com/wiki/Android_%28Command_Line%29