Re: [libmicrohttpd] MHD requires GnuTLS and other libraries

[Evgeny Grin]

Hello David,

First of all, please, follow advices already given.
Learn more about cross-compilation of projects that require dependency.

The basic idea is to re-create filesystem structure at some prefix, 
compile and *install* all dependencies to this prefix. The prefix is 
provided by configure parameter, like
'./configure --prefix=/home/test/arm-root' or any other path at your 
choice. Then use PKG_CONFIG_PATH variable so pkg-config will take care 
of all required lib paths and flags for precompiler and linker.
Alternatively, you can specify all required path in flags manually. From 
you config.log it's clear that GnuTLS failed to find required module 
from nettle. If you link with GnuTLS, you need to provide all libs and 
linker path for all libs required by GnuTLS. If those libraries require 
other libraries, you must specify them as well. That's why it's better 
to use pkg-config to automate it.
Usage of both '--with-gnutls=/path/to/gnutls' AND CPPFLAGS='-I 
/path/to/gnutls/include' is redundant. You don't need both. Check result 
in you log. Same for LDFLAGS.

One more alternative: compile everything as static libs.

It's interesting that MHD can still be compiled with so ancient Linux 
(2.6.18) and tools (GCC 4.2.3). Looks like we succeed in maintaining of 
backward compatibility.

One more note: looks like you specified somewhere path incorrectly. You 
have '/mnt/hgfs/Projects/GnuTLS/gnutls-3.6.15' and 
'/mnt/hgfs/Projects/gnutls/gnutls-3.6.15/'. It is not the same, this is 
two different paths on Linux.

Please, use more web search. You faced typical cross-compilation 
problems, there are many solutions on the web.

--
Evgeny

On 10.12.2020 15:30, DJM-Avalesta wrote:
> Hi,
>
> I've now cross-comiled GnuTLS and all of it's dependant libraries eg 
> libnettle, libhogweed, libgmp.
>
> I now need to build libmicrohttpd and link it to my GnuTLS.
>
> I run the following configure command
>
> /./configure --host=arm-none-linux-gnueabi --enable-https=yes 
> --with-gnutls=/mnt/hgfs/Projects/GnuTLS/gnutls-3.6.15/
>
> but I get the attached config log and this failure message
>
> /checking how to find GnuTLS library... 
> -I/mnt/hgfs/Projects/GnuTLS/gnutls-3.6.15/include 
> -L/mnt/hgfs/Projects/GnuTLS/gnutls-3.6.15/lib -lgnutls/
> /checking for gnutls/gnutls.h... yes/
> /checking for gnutls_priority_set in -lgnutls... no/
> /configure: error: can't find usable libgnutls at specified prefix 
> /mnt/hgfs/Projects/GnuTLS/gnutls-3.6.15/
>
> Any suggestions at this point would be very helpful.
>
> Regards
>
> David
>
> On 2020-12-05 8:29 pm, Christian Grothoff wrote:
>
> > Hi David,
> >
> > How to cross-compile GnuTLS is a question better suited for the GnuTLS
> > mailinglist ;-).
> >
> > Good luck!
> >
> > Happy hacking!
> >
> > Christian
> >
> > On 12/5/20 9:24 PM, DJM-Avalesta wrote:
> > > Hi,
> > >
> > > To get MHD working with HTTPS on my embedded system, I need to link
> > > libmicrohttpd with GnuTLS, so I need to cross compile GnuTLS.
> > >
> > > When I run configure for GnuTLS, I get "libNettle 3.4.1 was not found".
> > >
> > > I downloaded the source for libNettle 3.4.1 and built this, but when I
> > > re-configure GnuTLS with libNettle, I stilll get "libNettle 3.4.1 was
> > > not found"
> > >
> > > Reading up on this it seems I might also need to build libHogweed and
> > > libGMP libraries.
> > >
> > > Has anyone out there cross compiled all of these libraries and can help
> > > me to get all of these downloads and steps correct, so I can build an
> > > HTTPS-enabled MHD?
> > >
> > > Many thanks
> > >
> > > David

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