config.status shouldn't delete files it can't recreate

[Ben Pfaff]

In Autoconf 2.58 (at least), "./config.status --file=foo" deletes
foo regardless of whether foo.in exists.  It is easy to fix by
doing the deletion after the check for the input file:

--- autoconf-2.58.orig/lib/autoconf/status.m4
+++ autoconf-2.58/lib/autoconf/status.m4
@@ -955,10 +959,6 @@
   esac
 ])dnl
 
-  if test x"$ac_file" != x-; then
-    AC_MSG_NOTICE([creating $ac_file])
-    rm -f "$ac_file"
-  fi
   # Let's still pretend it is `configure' which instantiates (i.e., don't
   # use $as_me), people would be surprised to read:
   #    /* config.h.  Generated by config.status.  */
@@ -993,6 +993,11 @@
         fi;;
       esac
     done` || AS_EXIT([1])
+
+  if test x"$ac_file" != x-; then
+    AC_MSG_NOTICE([creating $ac_file])
+    rm -f "$ac_file"
+  fi
 _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF
 dnl Neutralize VPATH when `$srcdir' = `.'.

-- 
"Ho ho ho. I _so_ enjoy making a fool out of myself."
--Linus, on Christmas Day, 2000