--- a/libdecnumber/configure.ac	Tue May 25 18:58:51 2010 +0900
+++ b/libdecnumber/configure.ac	Tue Mar 22 17:18:12 2011 +0900
@@ -75,42 +75,11 @@
 # Default decimal format
 # If you change the defaults here, be sure to change them in the GCC directory also
 AC_MSG_CHECKING([for decimal floating point])
-AC_ARG_ENABLE(decimal-float,
-[  --enable-decimal-float={no,yes,bid,dpd}
-			enable decimal float extension to C.  Selecting 'bid'
-			or 'dpd' choses which decimal floating point format
-			to use],
-[
-  case $enable_decimal_float in
-    yes | no | bid | dpd) ;;
-    *) AC_MSG_ERROR(['$enable_decimal_float' is an invalid value for --enable-decimal-float.
-Valid choices are 'yes', 'bid', 'dpd', and 'no'.]) ;;
-  esac
-],
-[
-  case $target in
-    powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux*)
-      enable_decimal_float=yes
-      ;;
-    *)
-      enable_decimal_float=no
-      ;;
-  esac
-])
+
+GCC_AC_ENABLE_DECIMAL_FLOAT([$target])
 
-# x86's use BID format instead of DPD
-# In theory --enable-decimal-float=no should not compile anything
-# For the sake of simplicity, just use the default format in this directory
-if test x$enable_decimal_float = xyes -o x$enable_decimal_float = xno; then
-  case $target in
-    i?86*-*-linux* | x86_64*-*-linux*)
-      enable_decimal_float=bid
-      ;;
-    *)
-      enable_decimal_float=dpd
-      ;;
-  esac
-fi
+# Use default_decimal_float for dependency.
+enable_decimal_float=$default_decimal_float
 
 # If BID is being used, additional objects should be linked in.
 if test x$enable_decimal_float = xbid; then