Re: [lwip-users] Errors during build of lwip in Windows

[Giuseppe Modugno]

Il 17/04/2023 12:41, Simon Goldschmidt ha scritto:
> Am 17. April 2023 08:38:56 MESZ schrieb Giuseppe Modugno 
> <giuseppe.modugno.loqed@gmail.com>:
> > Il 15/04/2023 01:58, Giuseppe Modugno ha scritto:
[...]
> > I don't know exactly why, but the problem disappeared in my build system after 
> > postponing lwipallapps, such as:
> >
> > target_link_libraries(example_app ${LWIP_SANITIZER_LIBS} lwipcontribexamples 
> > lwipallapps lwipcontribapps lwipcontribaddons lwipcontribportwindows lwipcore 
> > lwipmbedtls)
>
> That's a known problem of the gnu linker: order of libraries is important!

I thought the order of libraries given to the linker was important for 
all linkers. Anyway, are you going to change the order to fix this 
problem on gnu linker?

I don't think I'm the only one that uses gnu linker. I suppose many uses 
GNU Arm toolchain for embedded.


> > > Lastly another strange behaviour. If I enable LWIP_HTTPD_APP, the build process 
> > > is ok, but I can't see the web page on the browser when I type the URL 
> > > http://192.168.1.200.
> > [...]
> >
> > I suspect there's a problem with WinPcap libraries. If I try to connect to the 
> > http server from another machine, it works. Even ping to lwip doesn't work from 
> > the Windows host machine.
> >
> > Do you know how this can be solved?
>
> When talking loopback to the application, checksums are not generated as the 
> windows driver or hardware generates them. Either you turn off that option in 
> the windows driver or you disable checksum checks in lwip.

Thank you, yes, it works.