Re: [PATCH] Fix allnoconfig build with gcc4

[Linus Torvalds <torvalds@osdl.org>]

On Sat, 10 Sep 2005 mikukkon@iki.fi wrote:
>
> It seems that git commit 20380731bc2897f2952ae055420972ded4cd786e breaks
> allnoconfig build with gcc4:
> 
>   CC      init/main.o
> In file included from include/linux/netdevice.h:29,
> 		   from include/net/sock.h:48,
> 		   from init/main.c:50:
> include/linux/if_ether.h:114: error: array type has incomplete element type
> 
> The "normal" fix of replacing foo[] with *foo would is not trivial, but
> simply removing the offending line is.
> 
> Signed-off-by: Mika Kukkonen <mikukkon@iki.fi>

No, this would cause a compile error if CONFIG_NET and CONFIG_SYSCTL is
enabled (because sysctl_net.c needs that declaration).

So the correct solution is apparently either one of

 - always declare an empty "struct ctl_table" regardless of whether SYSCTL 
   is enabled or not.

   This might be a good idea, since it probably allows more code to be 
   compiled without checking for CONFIG_SYSCTL.

 - put the ether_table[] declaration inside a #ifdef CONFIG_SYSCTL.

Maybe somebody else has a stronger opinion than I do about which of these 
is the right solution.

		Linus
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