Cross compiled C Windows libcurl doesn't get linked correctly on Ubuntu

I am currently trying to cross compile libcurl in c for Windows 32x on Ubuntu 64x 14.04. After a bit of research I followed these steps:

<p>1) Download library from

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</p>
<p>2) Go into extracted libcurl folder and execute:</p>
`./configure --host=i686-w64-mingw32 --build=i686-pc-linux-gnu --prefix=/usr/i686-w64-mingw32/ --enable-static --disable-shared`
<p>3) Execute: make </p>
4) Execute: sudo make install

Then I added these include statements:

#include <winsock2.h> // Needed for curl
#include <windows.h> // Windows API
#include <curl/curl.h>

int main(int argc, char** argv)
{
CURL *curl;
CURLcode response;

char url[] = "someurl.com";

curl = curl_easy_init();
if(curl)
{
curl_easy_setopt(curl, CURLOPT_URL, url); //set url options

/* Perform the request, res will get the return code */
response = curl_easy_perform(curl);

if(response != CURLE_OK)
{
//Do something
}

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

return 0;
}

Now I tried to compile my code with following arguments:

i686-w64-mingw32-gcc main.c -o main.exe -L/usr/i686-w64-mingw32/lib -lcurl

The compiler returned following error code:

/tmp/ccebLf6U.o:main.c:(.text+0x336): Not defined reference to `_imp__curl_easy_init'
/tmp/ccebLf6U.o:main.c:(.text+0x365): Not defined reference to `_imp__curl_easy_setopt'
/tmp/ccebLf6U.o:main.c:(.text+0x372): Not defined reference to `_imp__curl_easy_perform'
/tmp/ccebLf6U.o:main.c:(.text+0x3f4): Not defined reference to `_imp__curl_easy_cleanup'
collect2: error: ld returned 1 exit status

Has someone an idea on how to fix this ?


**[EDIT]**
<p>Something really interesting I stumbled upon is that if you call curl-config you get a bunch of compiler options. </p>

From the [curls FAQ][1]:

> If you get linker error like "unknown symbol __imp__curl_easy_init
> ..." you have linked against the wrong (static) library. If you
> want to use the libcurl.dll and import lib, you don't need any extra
> CFLAGS, but use one of the import libraries below. These are the
> libraries produced by the various lib/Makefile.* files:
>
> Target: static lib. import lib for libcurl*.dll.
> -----------------------------------------------------------
> MingW: libcurl.a libcurldll.a
> MSVC (release): libcurl.lib libcurl_imp.lib
> MSVC (debug): libcurld.lib libcurld_imp.lib
> Borland: libcurl.lib libcurl_imp.lib

Try path to linker `-lcurl_imp` or `-llibcurl_imp`

**Update**: Here is write flags on my Ubuntu with MinGW64:

i686-w64-mingw32-g++ -o app.exe objects.a -Lexternals/curl-7.39.0/lib -llibcurl_imp

Why I use `libcurl_imp.lib` instead `libcurldll.a` as described in table above? Becouse I build curl with cmake which make `libcurl_imp.lib`. So you should check name of built library.


[1]:

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Cross-Compiling library Using `--prefix` you are defining the the toplevel installation directory.

Libs will be placed into `/usr/i686-w64-mingw32/lib`

Same thing for includes files they will be placed `/usr/i686-w64-mingw32/include`

Using `-L/usr/i686-w64-mingw32/` you are pointing the wrong path for libraries and cross-compiler cannot find `libcurl`

To point to the correct include location you have to add `-I/usr/i686-w64-mingw32/include` to your command.

At the end you compiled curl libs static only then you want to compile them statically: add `-static` to your command.

SO the correct command will be:

i686-w64-mingw32-gcc -static -I/usr/i686-w64-mingw32/include -L/usr/i686-w64-mingw32/lib -lcurl main.c -o main.exe

So my solution to this problem probably lies right here:
[Cross compile tips for libraries][1]

These are some tips and tricks for the cross compilation compiler mingw32 and the compilation of curl with my missing argument -DCURL_STATICLIB. I didn't test this out though because I solved the problem without curl.


[1]:

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