struct ldieee should be packed

[Shoichi Sakon]

Hello,

The following test program prints 1.0 instead of -1.0.
-------------------------------------
#include <stdio.h>
int main() {
        double x = -1.0;
        printf("%f\n",x);
	return 0;
}
-------------------------------------

I believe the cause of the problem is the struct ldieee
defined in newlib/libc/stdio/vfieeefp.h is not "packed",
and in the function cvt in newlib/libc/stdio/vfieeefp.h 
ld.ieee.sign does not get the proper sign.

When I change all the definitions of
 struct ldieee
to 
 struct __attribute__ ((__packed__)) ldieee
I can get the right result at the test program.

vfieeefp.h:
-------------------------------------
#ifdef IEEE_8087
#if LDBL_MANT_DIG == 24
struct ldieee
{
  unsigned manh:23;
  unsigned exp:8;
  unsigned sign:1;
};
#elif LDBL_MANT_DIG == 53
struct ldieee
{
  unsigned manl:20;
  unsigned manh:32;
  unsigned exp:11;
  unsigned sign:1;
};
#elif LDBL_MANT_DIG == 64
struct ldieee
{
  unsigned manl:32;
  unsigned manh:32;
  unsigned exp:15;
  unsigned sign:1;
};
#elif LDBL_MANT_DIG > 64
struct ldieee
{
  unsigned manl3:16;
  unsigned manl2:32;
  unsigned manl:32;
  unsigned manh:32;
  unsigned exp:15;
  unsigned sign:1;
};
  ...
--------------------------------------


vfprintf.c:
--------------------------------------
# else /* !_NO_LONGDBL */
        union
        {
          struct ldieee ieee;
          _LONG_DOUBLE val;
        } ld;

        ld.val = value;
        if (ld.ieee.sign) { /* this will check for < 0 and -0.0 */
                value = -value;
                *sign = '-';
        } else
                *sign = '\000';
--------------------------------------

Shoichi Sakon
NEC Corp.