#elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
fp->_flags |= __SERR;
#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
-# if defined __sun && defined __sparc && defined _LP64 /* Solaris/SPARC 64-bit */
- ((unsigned int *) fp) [9] |= _IOERR;
+# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
+# define fp_ ((struct { unsigned char *_ptr; \
+ unsigned char *_base; \
+ unsigned char *_end; \
+ long _cnt; \
+ int _file; \
+ unsigned int _flag; \
+ } *) fp)
+ fp_->_flag |= _IOERR;
# else
fp->_flag |= _IOERR;
# endif