MinGW 编译 libCurl

Win32 - Generic curl-7.50.3.zip
https://curl.haxx.se/download.html

解压
编译libcurl
cd lib
mingw32-make -f Makefile.m32

编译curl
cd src
mingw32-make -f Makefile.m32

复制 include\curl 到项目目录
复制 lib 目录下 libcurl.a libcurldll.a libcurl.dll 到项目 lib 目录下

修改Clion输出目录 Setting - Build - CMake，Build output path: bin
拷贝 libcurl.dll 到 bin/Debug

测试程序
#include 
#include "include/curl/curl.h"

using namespace std;

int main(int argc, char * argv[])
{
    CURL *curl;
    CURLcode res;

    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, "https://www.xxx.com/");
        //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
        //curl_easy_setopt(curl, CURLOPT_PROXY, "10.59.77.11:8118");
        res = curl_easy_perform(curl);

        if(CURLE_OK == res) {
            char *ct;
            /* ask for the content-type */
            res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);

            if((CURLE_OK == res) && ct)
                printf("We received Content-Type: %s\n", ct);
        }

        /* always cleanup */
        curl_easy_cleanup(curl);
    }

    cout << endl;
    system("pause");
    return 0;
}


编译libcurl-7.50.3 with openssl-1.0.2j，use tdm-gcc-5.1.0-3 and git bash 2.9.0_x64
http://www.stringcat.com/company_blog/2015/12/07/compiling-openssl-on-windows-mingw32/
Requirements
1、perl http://www.activestate.com/activeperl
perl -v

2、Mingw32
gcc -v

3、GNU make
make -v
或
mingw32-make -v

4、tar
tar --version

Dynamic link libraries
cd openssl-1.0.2j
1.perl Configure mingw shared
it should do some stuff ( a minute or so) and should end with something like:
Configured for mingw.

2.
./config -t
./config threads shared
复制 mingw32-make 为 make
make depend

make
或
mingw32-make
会生成 libcrypto.a libssl.a libssl.dll.a libcrypto.dll.a 这四个文件和相应的dll文件

把libssl.dll.a libcrypto.dll.a拷贝到out文件夹里,重命名为"libssl32.a" "libeay32.a"
再次把libssl.dll.a libcrypto.dll.a拷贝到out文件夹里,重命名为"libssl.a" "libcrypto.a"

cd zlib-1.2.8
cp win32/makefile.gcc makefile.gcc
mingw32-make -f makefile.gcc

cd curl-7.50.3/lib
修改Makefile.m32
OPENSSL_PATH = ../../openssl-1.0.2j
ZLIB_PATH = ../../zlib-1.2.8

mingw32-make -f Makefile.m32 SSL=1 ZLIB=1

cd curl-7.50.3/src
修改Makefile.m32
OPENSSL_PATH = ../../openssl-1.0.2j
ZLIB_PATH = ../../zlib-1.2.8

mingw32-make -f Makefile.m32 SSL=1 ZLIB=1

MinGW使用-lxxx来链接库的时候，搜索库的顺序如下：
libxxx.dll.a 
xxx.dll.a 
libxxx.a 
cygxxx.dll (*) 
libxxx.dll 
xxx.dll

把 curl-7.50.3\lib\libcurldll.a 拷贝到项目 lib 目录下并引入
把 openssl-1.0.2j 目录下 libeay32.dll ssleay32.dll 拷贝到项目输出目录下
把 zlib-1.2.8 目录下 zlib1.dll 拷贝到项目输出目录下