[lwip-users] redefining LWIP_PLATFORM_DIAG(x)

[Joe Bloggs84]

Hi All,

I am interested in whether there is already a way to do this and I am 
missing something or whether a change like I am proposing would be 
useful to others.

cc.h defines LWIP_PLATFORM_DIAG(x)
as
#define LWIP_PLATFORM_DIAG(x) printf x;

I have a situation where I have to call a function other than printf for 
any diagnostic output (to support logging).

So I had to modify cc.h and now I have to keep making the patch each 
time I jump to a new version of lwip.

What about declaring LWIP_PLATFORM_DIAG and LWIP_PLATFORM_ASSERT only if 
they are not already declared.

So something trivial like:
#ifndef LWIP_PLATFORM_DIAG
#define LWIP_PLATFORM_DIAG(x) printf x;
#endif

#ifndef LWIP_PLATFORM_ASSERT
#define LWIP_PLATFORM_ASSERT(x) do { printf("Assertion \"%s\" failed at 
line %d in %s\n", \
                                            x, __LINE__, __FILE__); 
fflush(NULL); /* abort(); */ } while (0)
#endif

Or is there already a way of achieving this without having to patch the 
lwip source?

Thanks a lot,
Ian