to get newlib to work for little endian sh target, you might want to apply
this patch:

usr/local/lib/gcc-lib/sh-elf/2.95.2/include/stdarg.h:line 105-107

//  #if (defined (__arm__) && ! defined (__ARMEB__)) || defined (__i386__) || defined (__i860__) || defined (__ns32000__) || defined (__vax__)
  /* This is for little-endian machines; small args are padded upward.  */
  #define va_arg(AP, TYPE)                        \
   (AP = (__gnuc_va_list) ((char *) (AP) + __va_rounded_size (TYPE)), \
    *((TYPE *) (void *) ((char *) (AP) - __va_rounded_size (TYPE))))
//  #else /* big-endian */
  /* This is for big-endian machines; small args are padded downward.  */
//  #define va_arg(AP, TYPE)                        \
//   (AP = (__gnuc_va_list) ((char *) (AP) + __va_rounded_size (TYPE)), \
//    *((TYPE *) (void *) ((char *) (AP)                    \
//                 - ((sizeof (TYPE) < __va_rounded_size (char) \
//                 ? sizeof (TYPE) : __va_rounded_size (TYPE))))))
//  #endif /* big-endian */

... as you can see the linux dudes who ported gcc to sh target probably had the
big-endian evaluation boards and forgot to add some kind of switch kinda ;=P