libcurl是免费的轻量级的客户端网络库，支持DICT, FILE, FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS,POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMTP, SMTPS, Telnet, TFTP.支持SSL, HTTPPOST,HTTPPUT, FTP上传, HTTP form上传，代理，cookies, 用户名与密码认证。
系统环境：Ubuntu 16.04
源码：curl-7.63.0.tar.gz , 下载地址 https://curl.haxx.se/libcurl/
交叉编译环境：arm-none-linux-gnueabihf
libcurl原代码内包含了CMakeLists.txt和configure，两种方式都可以进行交叉编译
1. toolchain.cmake
1#toolchain cmake file 2#cmake -DCMAKE_TOOLCHAIN_FILE=~/toolchain.cmake ../ 3SET(CMAKE_SYSTEM_NAME Linux) 4SET(TOOLCHAIN_DIR "complier_dir") 5SET(3RDPART_LIBS_DIR "thirdpart_dir") 6 7#specify the cross compiler 8SET(CMAKE_C_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-gcc CACHE FILEPATH "Archiver") 9SET(CMAKE_CXX_COMPILER ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-g++ CACHE FILEPATH "Archiver") 10 11#SET(CMAKE_GFORTRAN ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-gfortran) 12SET(CMAKE_AR ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-ar CACHE FILEPATH "Archiver") 13SET(CMAKE_AS ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-as CACHE FILEPATH "Archiver") 14SET(CMAKE_LD ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-ld CACHE FILEPATH "Archiver") 15SET(CMAKE_NM ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-nm CACHE FILEPATH "Archiver") 16SET(CMAKE_STRIP ${TOOLCHAIN_DIR}/bin/arm-linux-gnueabihf-strip CACHE FILEPATH "Archiver") 17 18# where is the target environment 19SET(CMAKE_FIND_ROOT_PATH ${TOOLCHAIN_DIR} ${3RDPART_LIBS_DIR}) 20 21# search for programs in the build host directories 22SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER) 23 24# for libraries and headers in the target directories 25SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY) 26SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
交叉编译指令
cmake -DCMAKE_TOOLCHAIN_FILE=toochain._dir ../
2. configure
./configure --prefix=install_dir --host=arm-linux/arm-linux-gnueabihf/others CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++