linux curl编译 arm交叉编译

r囧r小猫 2021-08-27 00:22 489阅读 0赞

虚拟机环境  
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

《linux 交叉编译 openssl》[https://blog.csdn.net/whatday/article/details/96978381][https_blog.csdn.net_whatday_article_details_96978381]

现在我们先讲PC端编译库

### 1、下载源码 ###

[https://curl.haxx.se/download.html][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 SMBS

然后执行make&make install

make curl_LDFLAGS=-all-static
    make install curl_LDFLAGS=-all-static

**3.2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/curl

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=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 SMBS

然后执行make&make install

make
    
    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

需要注意的是如果需要使用openssl，openssl的库也需要是arm的，否则make阶段会报错。

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 <stdio.h>
    #include <curl/curl.h>
    #include <stdlib.h>
    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 <url>;/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;
    }

解析输入的http网页，直接输出到终端

// 采用CURLOPT_WRITEFUNCTION 实现网页下载保存功能
    //save_http www.baidu.com  /tmp/baidu
    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
     
    #include <curl/curl.h>
    #include <curl/typecheck-gcc.h>
    #include <curl/easy.h>
     
    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);
    }

解析http并保存为文件。

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。

[https_blog.csdn.net_whatday_article_details_96978381]: https://blog.csdn.net/whatday/article/details/96978381
[https_curl.haxx.se_download.html]: https://curl.haxx.se/download.html