curl编译以及arm交叉编译
虚拟机环境
ubuntu12.04
开发板
ubuntu12.04
开发板
EasyARM-i.MX280A： 64m sdram 128M nandflash 运行官方提供的Linux-2.6.35.3内核linux
首先，如果需要使用curl解析https需要先编译openssl库，编译这个库可以参考
http://blog.csdn.net/andylauren/article/details/53456340
现在我们先讲PC端编译库
1、下载源码
https://curl.haxx.se/download.html
在这里下载源码，我下载的是curl 7.57.0, Released on the 29th of November 2017. curl-7.57.0.tar.gz
2、解压包并进入目录
linux@ubuntu:~/opt/curl/curl-7.57.0$ tarxvf curl-7.57.0.tar.gz
linux@ubuntu:~/opt/curl/curl-7.57.0$ cdcurl-7.57.0/
3、输入如下配置
3.1只编译静态库
CPPFLAGS="-I/home/linux/opt/openssl/-I/home/linux/opt/openssl/include"LDFLAGS="-L/home/linux/opt/openssl/lib" LIBS="-ldl"./configure --with-ssl --disable-shared --enable-static --disable-dict--disable-ftp --disable-imap --disable-ldap --disable-ldaps --disable-pop3--disable-proxy --disable-rtsp --disable-smtp --disable-telnet --disable-tftp--disable-zlib --without-ca-bundle --without-gnutls --without-libidn--without-librtmp --without-libssh2 --without-nss --without-zlib--prefix=/home/linux/opt/curl
正常是不会遇到问题，遇到问题再具体解决configure: Configured to build curl/libcurl:
curl version: 7.57.0
Host setup: i686-pc-linux-gnu
Install prefix: /home/linux/opt/curl
Compiler: gcc
SSL support: enabled (OpenSSL)
SSH support: no (--with-libssh2)
zlib support: no (--with-zlib)
brotli support: no (--with-brotli)
GSS-API support: no (--with-gssapi)
TLS-SRP support: enabled
resolver: POSIX threaded
IPv6 support: enabled
Unix sockets support: enabled
IDN support: no (--with-{libidn2,winidn})
Build libcurl: Shared=no, Static=yes
Built-in manual: enabled
--libcurl option: enabled (--disable-libcurl-option)
Verbose errors: enabled (--disable-verbose)
SSPI support: no (--enable-sspi)
ca cert bundle: no
ca cert path: /etc/ssl/certs/
ca fallback: no
LDAP support: no (--enable-ldap / --with-ldap-lib / --with-lber-lib)
LDAPS support: no (--enable-ldaps)
RTSP support: no (--enable-rtsp)
RTMP support: no (--with-librtmp)
metalink support: no (--with-libmetalink)
PSL support: no (libpsl not found)
HTTP2 support: disabled (--with-nghttp2)
Protocols: FILE GOPHER HTTP HTTPS SMB SMBSmake curl_LDFLAGS=-all-static
make install curl_LDFLAGS=-all-static3.2静态库和动态库都编译
CPPFLAGS="-I/home/linux/opt/openssl/ -I/home/linux/opt/openssl/include" LDFLAGS="-L/home/linux/opt/openssl/lib" LIBS="-ldl" ./configure --with-ssl --enable-shared --enable-static --disable-dict --disable-ftp --disable-imap --disable-ldap --disable-ldaps --disable-pop3 --disable-proxy --disable-rtsp --disable-smtp --disable-telnet --disable-tftp --disable-zlib --without-ca-bundle --without-gnutls --without-libidn --without-librtmp --without-libssh2 --without-nss --without-zlib --prefix=/home/linux/opt/curlconfigure: Configured to build curl/libcurl:
curl version: 7.57.0
Host setup: i686-pc-linux-gnu
Install prefix: /home/linux/opt/curl
Compiler: gcc
SSL support: enabled (OpenSSL)
SSH support: no (--with-libssh2)
zlib support: no (--with-zlib)
brotli support: no (--with-brotli)
GSS-API support: no (--with-gssapi)
TLS-SRP support: enabled
resolver: POSIX threaded
IPv6 support: enabled
Unix sockets support: enabled
IDN support: no (--with-{libidn2,winidn})
Build libcurl: Shared=yes, Static=yes
Built-in manual: enabled
--libcurl option: enabled (--disable-libcurl-option)
Verbose errors: enabled (--disable-verbose)
SSPI support: no (--enable-sspi)
ca cert bundle: no
ca cert path: /etc/ssl/certs/
ca fallback: no
LDAP support: no (--enable-ldap / --with-ldap-lib / --with-lber-lib)
LDAPS support: no (--enable-ldaps)
RTSP support: no (--enable-rtsp)
RTMP support: no (--with-librtmp)
metalink support: no (--with-libmetalink)
PSL support: no (libpsl not found)
HTTP2 support: disabled (--with-nghttp2)
Protocols: FILE GOPHER HTTP HTTPS SMB SMBSmake
make install
其中
CPPFLAGS="-I/home/linux/opt/openssl/ -I/home/linux/opt/openssl/include" LDFLAGS="-L/home/linux/opt/openssl/lib"
是openssl的头文件路径以及openssl库文件路径
--prefix=/home/linux/opt/curl
是编译好后的安装位置
这样就完成了PC端的编译，编译好的库文件安装在/home/linux/opt/curl/lib下。
4、arm的交叉编译
在完成了PC端的编译后，arm的交叉编译就简单很多，之前的步骤都一样，解压进入目录。
输入配置信息如下：
CPPFLAGS="-I/home/linux/arm/openssl/ -I/home/linux/arm/openssl/include" LDFLAGS="-L/home/linux/arm/openssl/lib" LIBS="-ldl" ./configure --host=arm-linux CC=arm-linux-gcc CXX=arm-linux-g++ --with-ssl --enable-shared --enable-static --disable-dict --disable-ftp --disable-imap --disable-ldap --disable-ldaps --disable-pop3 --disable-proxy --disable-rtsp --disable-smtp --disable-telnet --disable-tftp --disable-zlib --without-ca-bundle --without-gnutls --without-libidn --without-librtmp --without-libssh2 --without-nss --without-zlib --prefix=/home/linux/arm/curl
其中 --host=arm-linux CC=arm-linux-gcc CXX=arm-linux-g++配置交叉编译器
配置执行完成后如下信息
configure: Configured to build curl/libcurl:
curl version: 7.57.0
Host setup: arm-unknown-linux-gnu
Install prefix: /home/linux/arm/curl
Compiler: arm-linux-gcc
SSL support: enabled (OpenSSL)
SSH support: no (--with-libssh2)
zlib support: no (--with-zlib)
brotli support: no (--with-brotli)
GSS-API support: no (--with-gssapi)
TLS-SRP support: enabled
resolver: POSIX threaded
IPv6 support: enabled
Unix sockets support: enabled
IDN support: no (--with-{libidn2,winidn})
Build libcurl: Shared=yes, Static=yes
Built-in manual: enabled
--libcurl option: enabled (--disable-libcurl-option)
Verbose errors: enabled (--disable-verbose)
SSPI support: no (--enable-sspi)
ca cert bundle: no
ca cert path: no
ca fallback: no
LDAP support: no (--enable-ldap / --with-ldap-lib / --with-lber-lib)
LDAPS support: no (--enable-ldaps)
RTSP support: no (--enable-rtsp)
RTMP support: no (--with-librtmp)
metalink support: no (--with-libmetalink)
PSL support: no (libpsl not found)
HTTP2 support: disabled (--with-nghttp2)
Protocols: FILE GOPHER HTTP HTTPS SMB SMBS
然后就是make&make install
完成后将库文件复制到开发板中，运行时需要找到动态库
linux@ubuntu:~/arm/curl/lib$ cp -alibcurl.so* /nfsroot/rootfs/lib/
5、下面来几个简单的例子供大家测试
#include
#include
#include
int main(int argc, char *argv[])
{
CURL *curl; //定义CURL类型的指针
CURLcode res; //定义CURLcode类型的变量，保存返回状态码
if(argc!=2) {
printf("Usage : file ;/n");
exit(1);
}
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init(); //初始化一个CURL类型的指针
if(curl!=NULL) {
//设置curl选项. 其中CURLOPT_URL是让用户指定url. argv[1]中存放的命令行传进来的网址
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
//调用curl_easy_perform 执行我们的设置.并进行相关的操作. 在这里只在屏幕上显示出来.
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
//清除curl操作.
curl_easy_cleanup(curl);
}
return 0;
} // 采用CURLOPT_WRITEFUNCTION 实现网页下载保存功能
//save_http www.baidu.com /tmp/baidu
#include
#include
#include
#include
#include
#include
FILE *fp; //定义FILE类型指针
//这个函数是为了符合CURLOPT_WRITEFUNCTION而构造的
//完成数据保存功能
size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
int written = fwrite(ptr, size, nmemb, (FILE *)fp);
return written;
}
int main(int argc, char *argv[])
{
CURL *curl;
curl_global_init(CURL_GLOBAL_ALL);
curl=curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
if((fp=fopen(argv[2],"w"))==NULL)
{
curl_easy_cleanup(curl);
exit(1);
}
////CURLOPT_WRITEFUNCTION 将后继的动作交给write_data函数处理
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
exit(0);
}
注意：当使用静态库时需要额外连接几个库，否则连接出错
LIBS := curl pthread ssl crypto dl rt
其中ssl和crypto需要自行编译，并且制定库路径。
实测使用静态库与动态库程序执行时间相差无几，所以建议使用动态库。