Bug in C FE or difference between C & C++

[Bingfeng Mei]

Hi, 

For the following simple example,

int main(void) 
{
 int a=0; 
  switch (a) 
    { 
    case 0: 
     int b=2; 
     break; 
     }
}

GCC will complain:
tst.c: In function 'main':
tst.c:7:6: error: a label can only be part of a statement and a declaration is 
not a statement
G++ will compile silently.

Is this a C FE bug or due to difference between C & C++? 

Thanks,
Bingfeng