question about linkage

[Matthew Self]

henry at utzoo.uucp (Henry Spencer) writes:
>In article <80 at bomb.next.com> mself at bomb.UUCP (My Account) writes:
>>How, then, can you forward declare an object with internal
>>linkage whose size isn't known when you forward declare it?
>>[old solution which sometimes works is non-ANSI, ANSI solution is not
>> acceptable to some old compilers]
						   ^^^^^^^^^^^^^
What ANSI solution?

How can you forward declare a static object of variable size in ANSI C?

This doesn't work:

static int foo[];

/* many uses of foo here. */

static int foo[] = {0, 1, 2, 3};    /* now that I know how big it is */

GCC will not compile this, complaining that the first declaration of foo
has unknown size.  I asked RMS whether ANSI required this behaviour,
and he said yes.  Is this a bug in GCC?

As far as I have been able to tell, there is NO way to forward declare
a static array in ANSI C.  This is a serious step backward!