[lwip-devel] [task #7054] Clarification needed for variable initialization

[Frédéric Bernon]

Follow-up Comment #3, task #7054 (project lwip):

In "The C Programming Language" by Kernighan & Ritchie, we can read "External
and static variables are initialized to zero by default." Of course, you need
to have a ANSI C compiler to be sure of that.

Problem with that is you have to be sure your compiler is really ANSI. So,
using _init functions the only solution to be sure about the init value for
any compiler.

Using INIT_NULL is a good idea since each one can decide to belive or not the
ANSI compilance of his compiler. For array like tcp_backoff, I  think you can
let them like this. For ZEROing arrays, you could do the same thing that
INIT_NULL like:

#define INIT_ARRAY_NULL = {0}



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