[ECOS]How to run testprograms for lwip

[Simon Kallweit]

Sergei Gavrikov wrote:
> Hi Simon,
> 
> Thank you for your contribution. I tried to built lwIP's with SNMP
> support using your snapshot. Unfortunately, I ran in a problem with CPP
> defines for eCos (lwipopts.h).

Glad there are people starting to test the port :)

> mib2.c:70:
> #define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
> 
> mib2.c:766:
> static const s32_t sysservices = SNMP_SYSSERVICES;
> 
> lwipopts.h:102:
> #define IP_FORWARD                  defined(CYGFUN_LWIP_IP_FORWARD)
> 
> So, the above init will become itself:
> 
> static const s32_t sysservices = ((1 << 6) | (1 << 3) | ((defined(CYGFUN_LWIP_IP_FORWARD)) << 2))
> 
> May be the below should be used in lwipopts.h?
> 
> #if defined(CYGFUN_LWIP_IP_FORWARD)
> # define IP_FORWARD 1
> #else
> # define IP_FORWARD 0
> #endif

That's exactly the right fix. There are already some other defines which 
use that scheme in lwipopts.h (CYGFUN_LWIP_PAP_SUPPORT is such an example).

> FYI: There are a few defines like this
> 
> #define FOO defined(CYG_FOO)
> 
> in lwipopts.h. Small testcase:
> 
> #define CYG_FOO 1
> #define FOO defined(CYG_FOO)
> 
> main ()
> {
>   int foo = FOO;
> }
> 
> It cannot be linked. FOO is not boolean ;-) I can check the same
> "rvalues" then and send a patch if you want.

As I have not used SNMP myself yet, it had to be expected that there are 
some issues left. If you can provide a patch that'd be great!

Simon

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