[lwip-devel] struct netif

[christiaan . simons]

Hi all,

I'm a bit confused about a "forward declaration" in src/include/ipv4/ip.h.

The
struct netif;

on line 43
creates a new (empty) type since it is a redeclaration from the struct  in
netif.h.
I think it needs to be removed OR there is a problem in the includes
somewhere (header cycle?).

Our Tasking compiler gives an error on this redeclaration.
I've also checked two other compilers with the following simple test

struct test; /* normal forward declaration */
struct test
{
   int bla;
};
struct test; /* backward, ANSI violation */

GCC accepts this construct, even with -pedantic -ansi -Wall,
but it does violate ANSI C (page 213 in the reference manual).
M$ visual C++ rejects this as the Tasking c166/st10 cc does.

I believe someone complained about this problem before:
http://lists.gnu.org/archive/html/lwip-users/2003-11/msg00076.html


Bye,

Christiaan Simons

Software Engineer
Axon Digital Design

+31 (0)13 511 66 66
+31 (0)13 511 41 51

address@hidden
http://www.axon.tv



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