[Libwebsockets] Errors when building 3rd Party programs with v1.5 of LWS on WIndows

Roger Light roger at atchoo.org
Sun Nov 1 09:09:53 CET 2015

Hi Mark,

The point of lws_config.h is to provide information about what options
were configured when libwebsockets was compiled so you can detect
server support etc. This can mean it ends up with not a lot of

It's certainly a bug that lws_config.h isn't included.

The problem with the openssl header is that if libwebsockets is
compiled with SSL support then any third party programs need to have
knowledge of openssl data types - they are used in the
lws_context_creation_info struct (the point there is to allow an
already existing SSL_CTX to be used). It means you need to provide
include paths for openssl when compiling your own application.



On Sun, Nov 1, 2015 at 2:48 AM, Mark Hessling <andy.green at linaro.org> wrote:
> I upgraded my version of LWS from 1.3 to 1.5 and can no longer build my
> Rexx interface to LWS.
> The problem is that libwebsockets.h 1.5 has removed the #ifdef that
> surrounded #include "lws_config.h".  The first problem is that
> lws_config.h is not in a directory that is usually included, nor is it
> included as a file to install in the *.nsi that builds the Windows
> installer.
> If lws_config.h is made available for inclusion, errors occur on
> #include <openssl/ssl.h> because certainly on my machine OpenSSL is
> installed in a location like c:\OpenSSL-Win32.
> It appears that the only reason for exposing lws_config.h to builds
> outside of building LWS itself is to set LWS_SIZEOFPTR; new since v1.3.
> Not sure if the resolution is to surround #include "lws_config.h" again
> with CMAKE_BUILD and expose LWS_SIZEOFPTR some other way, or protect
> other areas of libwebsockets.h with CMAKE_BUILD like #include
> <openssl/ssl.h>
> Cheers, Mark
> --
> ------------------------------------------------------------------------
> * Mark Hessling, mark at rexx.org http://www.rexx.org/
> * Author of THE, a Free XEDIT/KEDIT editor and, Rexx/SQL, Rexx/CURL, etc.
> * Maintainer of Regina Rexx interpreter
> * Use Rexx? join the Rexx Language Association: http://www.rexxla.org/
> ------------------------------------------------------------------------
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