[gnu.gcc.bug] missed warning in GCC 1.34

rfg@MCC.COM (Ron Guilmette) (04/29/89)

As the following code will demonstrate, GCC 1.34/Sun3 will issue
warnings if a bit field has a negative width.  No warning will be
issued however if the width of a given field is zero.

struct s {
	unsigned int	f:0;		/* no warning */
};

struct s2 {
	unsigned int	f2:-1;		/* warning */
};