* acconfig.h (_FVWRITE_IN_STREAMIO): Undefine.

* newlib.hin (_FVWRITE_IN_STREAMIO): Undefine.
	* configure.in (--disable-newlib-fvwrite-in-streamio): New option.
	* configure: Regenerated.
	* libc/stdio/fputs.c (_fputs_r): Use _FVWRITE_IN_STREAMIO to
	control __sfvwrite_r.  Add alternative implementation.
	* libc/stdio/fputws.c (_fputws_r): Ditto.
	* libc/stdio/fwrite.c (_fwrite_r): Ditto.
	* libc/stdio/puts.c (_puts_r): Ditto.
	* libc/stdio/vfprintf.c (__ssputs_r, __sfputs_r): New function.
	(_VFPRINTF_R): Use _FVWRITE_IN_STREAMIO to control vector buffer.
	(__SPRINT): Use _FVWRITE_IN_STREAMIO to control macro definition.
	* libc/stdio/vfwprintf.c (_VFWPRINTF_R): Use _FVWRITE_IN_STREAMIO
	to control vector buffer.

newlib/configure

@@ -789,6 +789,7 @@ enable_newlib_iconv_to_encodings
 enable_newlib_iconv_external_ccs
 enable_newlib_atexit_dynamic_alloc
 enable_newlib_reent_small
+enable_newlib_fvwrite_in_streamio
 enable_multilib
 enable_target_optspace
 enable_malloc_debugging
@@ -1452,6 +1453,7 @@ Optional Features:
   --enable-newlib-iconv-external-ccs     enable capabilities to load external CCS files for iconv
   --disable-newlib-atexit-alloc    disable dynamic allocation of atexit entries
   --enable-newlib-reent-small   enable small reentrant struct support
+  --disable-newlib-fvwrite-in-streamio    disable iov in streamio
   --enable-multilib         build many library versions (default)
   --enable-target-optspace  optimize for space
   --enable-malloc-debugging indicate malloc debugging requested
@@ -2351,6 +2353,19 @@ else
   newlib_reent_small=
 fi
 
+# Check whether --enable-newlib-fvwrite-in-streamio was given.
+if test "${enable_newlib_fvwrite_in_streamio+set}" = set; then :
+  enableval=$enable_newlib_fvwrite_in_streamio; if test "${newlib_fvwrite_in_streamio+set}" != set; then
+  case "${enableval}" in
+    yes) newlib_fvwrite_in_streamio=yes ;;
+    no)  newlib_fvwrite_in_streamio=no  ;;
+    *)   as_fn_error $? "bad value ${enableval} for newlib-fvwrite-in-streamio option" "$LINENO" 5 ;;
+  esac
+ fi
+else
+  newlib_fvwrite_in_streamio=yes
+fi
+
 
 # Make sure we can run config.sub.
 $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
@@ -12232,6 +12247,13 @@ _ACEOF
 
 fi
 
+if test "${newlib_fvwrite_in_streamio}" = "yes"; then
+cat >>confdefs.h <<_ACEOF
+#define _FVWRITE_IN_STREAMIO 1
+_ACEOF
+
+fi
+
 
 if test "x${iconv_encodings}" != "x" \
    || test "x${iconv_to_encodings}" != "x" \