Re: [lwip-devel] RFC: debug and asserts (And: dynamic debug works for us)

[Leon Woestenberg]

Hello all,

Agreed on 1, 2, disagree on 3 for the reasons already given by others.

> > 3) Make debug and assert be checked with #if not #ifdef for
> > consistency again.
>
> Objection. As I keep repeating the current usage of debug checking in the
> code is a pain if you want to use dynamic debug switches as we do in our
> system. But as that complaint hasn't lead to changes so far, I guess you
may
> feel free to ignore my objection. :) (It would also mean larger changes).
>
We have been using dynamic debug switches without any problem in lwIP.

I think we did it by overriding the *_DEBUG macro's by #defining them
to be global external variables in lwipopts.h.

For example in lwipopts.h (and this is from heart):

extern u16_t dynamic debug;

#define UDP_DEBUG (dynamic_debug & 0x1)
#define TCP_DEBUG (dynamic_debug & 0x2)

We could then switch the variable bits as we like and this has worked for
us. We no longer use it in that way now, but I can dig up some old code
with a bit of luck.

Regards

Leon.