Experimental Physics and
Industrial Control System

"[email protected]" <[email protected]> · Fri, 18 May 2018 13:43:49 +0000

Hi,

It's been years since we last built this at DLS (2015) so Freddie's github repo is probably the most up-to-date. https://github.com/ISISComputingGroup/EPICS-nullhttpd

Its a bit of a strange setup: It seems the nullhttpd module doesn't have to be built as the sources are pulled into ffmpegServer at build time and rebuilt there. See https://github.com/areaDetector/ffmpegServer/blob/master/ffmpegServerApp/src/Makefile#L27

Also there are some comments in that makefile about nullhttpd requires win32 mode (-DWIN32)...

Cheers,
Ulrik

________________________________
From: [email protected] <[email protected]> on behalf of Freddie Akeroyd - UKRI STFC <[email protected]>
Sent: 17 May 2018 00:19
To: 'Andrew Johnson'; '[email protected]'
Subject: RE: Error LNK2005 building Diamond's nullhttpd module on Windows

Hi,

There are some fixes for these issue pushed to https://github.com/ISISComputingGroup/EPICS-nullhttpd

Regards,

Freddie

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Andrew Johnson
Sent: 16 May 2018 22:59
To: [email protected]
Subject: Re: Error LNK2005 building Diamond's nullhttpd module on Windows

Hi Lewis,

I know nothing about nullhttpd, but...

On 05/16/2018 04:41 PM, J. Lewis Muir wrote:
> Now I'm getting the following error (the full output is at the end of
> this email):
>
> ===
> link -nologo -subsystem:windows -dll -LTCG -incremental:no -opt:ref -release   /NODEFAULTLIB:LIBCMT.lib     -implib:nullhttpd.lib -out:nullhttpd.dll         cgi.obj files.obj http.obj win32.obj config.obj format.obj server.obj main.obj
> server.obj : error LNK2001: unresolved external symbol
> __imp__MessageBoxA@16 ===
>
> Ideas?

MessageBoxA() is a MS Windows call to bring up an alert box, and is found in user32.dll. You could try linking to that library.

> cl -c                -nologo -D__STDC__=0 -D_CRT_SECURE_NO_DEPRECATE -D_CRT_NONSTDC_NO_DEPRECATE   -Ox -GL -Oy-   -W3     -DWIN32    -MD     -I. -I..\\O.Common -I. -I.. -I..\\..\\include\\os\\WIN32 -I..\\..\\include -IC:\opt\epics-base\\include\\os\\WIN32 -IC:\opt\epics-base\\include          ..\\server.c
> server.c
> ..\server.c(46) : warning C4133: 'function' : incompatible types - from 'long *' to 'const time_t *'
> ..\server.c(70) : warning C4133: 'function' : incompatible types - from 'long *' to 'const time_t *'
> ..\server.c(447) : warning C4244: '=' : conversion from 'time_t' to
> 'int', possible loss of data

Those warnings look rather ominous, I would suggest investigating them to make sure they aren't going to cause problems. The time_t type on Windows may have changed from 32 to 64-bit since this code was written.

HTH,

- Andrew

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System