Not conform to c90?

[Bingfeng Mei]

Hello,
According to 
http://gcc.gnu.org/onlinedocs/gcc-4.6.1/gcc/Zero-Length.html#Zero-Length
A zero-length array should have a length of 1 in c90.

But I tried 

struct 
{
  char a[0];
} ZERO;

void main()
{
  int a[0];
  printf ("size = %d\n", sizeof(ZERO));
}

Compiled with gcc 4.7
~/work/install-x86/bin/gcc test.c -O2 -std=c90

size = 0

I noticed the following statement in GCC document.
"As a quirk of the original implementation of zero-length arrays, 
sizeof evaluates to zero." 

Does it mean GCC just does not conform to c90 in this respect?

Thanks,
Bingfeng Mei