configure argument --host=riscv is now implied

aclocal.m4

@@ -343,3 +343,19 @@ AC_DEFUN([MCPPBS_GROUP],
   ])
 
 ])
+
+#-------------------------------------------------------------------------
+# AX_DEFAULT_CONFIGURE_ARG
+#-------------------------------------------------------------------------
+# Simple little macro which adds a configure commane line option to an
+# internal autoconf shell variable. Not sure how safe this is, but it
+# seems to work fine.
+#
+# Author : Christopher Batten
+# Date   : August 20, 2009
+
+AC_DEFUN([AX_DEFAULT_CONFIGURE_ARG],
+[
+  AC_MSG_NOTICE([adding default configure arg: $1])
+  ac_configure_args="$1 ${ac_configure_args}"
+])

configure

@@ -3912,6 +3912,12 @@ CFLAGS="-Wall -Os -std=gnu99"
 LIBS="-lgcc"
 
 
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: adding default configure arg: --host=riscv" >&5
+$as_echo "$as_me: adding default configure arg: --host=riscv" >&6;}
+  ac_configure_args="--host=riscv ${ac_configure_args}"
+
+
 #-------------------------------------------------------------------------
 # MCPPBS subproject list
 #-------------------------------------------------------------------------

configure.ac

@@ -74,6 +74,8 @@ AC_HEADER_STDC
 AC_SUBST([CFLAGS],  ["-Wall -Os -std=gnu99"])
 AC_SUBST([LIBS],  ["-lgcc"])
 
+AX_DEFAULT_CONFIGURE_ARG([--host=riscv])
+
 #-------------------------------------------------------------------------
 # MCPPBS subproject list
 #-------------------------------------------------------------------------