自从NDK的r19开始，由于gcc兼容clang的编译方式有问题，该版本已经移除了相关gcc文件，所以用老方法交叉编译Openssl的时候，会提示找不到gcc文件。 实际现在是直接使用clang编译即可，具体方法如下： 1.下载NDK https://developer.android.com/ndk/downloads/index.html 2.下载openssl https://www.openssl.org/source/
3.设置相关环境变量
# Set directory SCRIPTPATH=`realpath .` export ANDROID_NDK_HOME=$SCRIPTPATH/android-ndk-r20 OPENSSL_DIR=$SCRIPTPATH/openssl-1.1.1c4.建立toolchains_path.py来获取设置toolchains_path
#!/usr/bin/env python """ Get the toolchains path """ import argparse import atexit import inspect import os import shutil import stat import sys import textwrap def get_host_tag_or_die(): """Return the host tag for this platform. Die if not supported.""" if sys.platform.startswith('linux'): return 'linux-x86_64' elif sys.platform == 'darwin': return 'darwin-x86_64' elif sys.platform == 'win32' or sys.platform == 'cygwin': host_tag = 'windows-x86_64' if not os.path.exists(os.path.join(NDK_DIR, 'prebuilt', host_tag)): host_tag = 'windows' return host_tag sys.exit('Unsupported platform: ' + sys.platform) def get_toolchain_path_or_die(ndk, host_tag): """Return the toolchain path or die.""" toolchain_path = os.path.join(ndk, 'toolchains/llvm/prebuilt', host_tag) if not os.path.exists(toolchain_path): sys.exit('Could not find toolchain: {}'.format(toolchain_path)) return toolchain_path def main(): """Program entry point.""" parser = argparse.ArgumentParser(description='Optional app description') parser.add_argument('--ndk', required=True, help='The NDK Home directory') args = parser.parse_args() host_tag = get_host_tag_or_die() toolchain_path = get_toolchain_path_or_die(args.ndk, host_tag) print toolchain_path if __name__ == '__main__': main()5.设置toolchains_path
toolchains_path=$(python toolchains_path.py --ndk ${ANDROID_NDK_HOME})6.进行OPENSSL环境配置
# Set compiler clang, instead of gcc by default CC=clang# Add toolchains bin directory to PATH PATH=$toolchains_path/bin:$PATH# Set the Android API levels ANDROID_API=21# Set the target architecture # Can be android-arm, android-arm64, android-x86, android-x86 etc architecture=android-arm7.make file
# Create the make file cd ${OPENSSL_DIR} ./Configure ${architecture} -D__ANDROID_API__=$ANDROID_API8.build
make9.拷贝到对应目录
# Copy the outputs OUTPUT_INCLUDE=$SCRIPTPATH/output/include OUTPUT_LIB=$SCRIPTPATH/output/lib/${architecture} mkdir -p $OUTPUT_INCLUDE mkdir -p $OUTPUT_LIB cp -RL include/openssl $OUTPUT_INCLUDE cp libcrypto.so $OUTPUT_LIB cp libcrypto.a $OUTPUT_LIB cp libssl.so $OUTPUT_LIB10.以上的代码整合到一个脚本如下：
#!/bin/bash set -e set -x # Set directory SCRIPTPATH=`realpath .` export ANDROID_NDK_HOME=$SCRIPTPATH/android-ndk-r20 OPENSSL_DIR=$SCRIPTPATH/openssl-1.1.1c # Find the toolchain for your build machine toolchains_path=$(python toolchains_path.py --ndk ${ANDROID_NDK_HOME}) # Configure the OpenSSL environment, refer to NOTES.ANDROID in OPENSSL_DIR # Set compiler clang, instead of gcc by default CC=clang # Add toolchains bin directory to PATH PATH=$toolchains_path/bin:$PATH # Set the Android API levels ANDROID_API=21 # Set the target architecture # Can be android-arm, android-arm64, android-x86, android-x86 etc architecture=android-arm # Create the make file cd ${OPENSSL_DIR} ./Configure ${architecture} -D__ANDROID_API__=$ANDROID_API # Build make # Copy the outputs OUTPUT_INCLUDE=$SCRIPTPATH/output/include OUTPUT_LIB=$SCRIPTPATH/output/lib/${architecture} mkdir -p $OUTPUT_INCLUDE mkdir -p $OUTPUT_LIB cp -RL include/openssl $OUTPUT_INCLUDE cp libcrypto.so $OUTPUT_LIB cp libcrypto.a $OUTPUT_LIB cp libssl.so $OUTPUT_LIB cp libssl.a $OUTPUT_LIB具体参考Tutorial: Compile OpenSSL 1.1.1 for Android application
