use md5 for scp2 stamp

Conflicts:
	Makefile.top

Change-Id: Ib416077c6a866c265f7346df8a86ac7bc254c37d

Makefile.in

@@ -192,7 +192,6 @@ endif
         $(BUILDDIR)/config.status \
         $(BUILDDIR)/config_build.mk \
         $(BUILDDIR)/config_host.mk \
-        $(BUILDDIR)/config_host.mk.last \
         $(BUILDDIR)/config_host.mk.stamp \
         $(BUILDDIR)/config_host/*.h \
         $(BUILDDIR)/configure \

configure.ac

@@ -11821,8 +11821,7 @@ if test "$MD5SUM" = "md5"; then
 fi
 
 if test -z "$MD5SUM"; then
-    AC_MSG_WARN([no md5sum: found!])
-    add_warning "no md5sum: found!"
+    AC_MSG_ERROR([no md5sum: found!])
 fi
 
 fi
@@ -12403,11 +12402,9 @@ fi
 
 AC_SUBST(LO_PATH)
 
-# Generate a configuration timestamp we can use for deps
+# Generate a configuration md5 we can use for deps
 if test -f config_host.mk; then
-    mv -f config_host.mk config_host.mk.last
-else
-    echo > config_host.mk.last
+    config_md5=`$MD5SUM config_host.mk | sed "s/ .*//"`
 fi
 
 AC_CONFIG_FILES([config_host.mk Makefile lo.xcent solenv/inc/minor.mk instsetoo_native/util/openoffice.lst])
@@ -12422,7 +12419,7 @@ AC_OUTPUT
 # touch the config timestamp file
 if test ! -f config_host.mk.stamp; then
     echo > config_host.mk.stamp
-elif diff config_host.mk config_host.mk.last >/dev/null 2>&1; then
+elif test "$config_md5" = `$MD5SUM config_host.mk | sed "s/ .*//"`; then
     echo "Configuration unchanged - avoiding scp2 stamp update"
 else
     echo > config_host.mk.stamp