Create a local copy of the scripts directory.

The idea is to move the build system out of the project tree as much as
possible. This has two benefits:
 - it does not add any baggage to somebody who just wants to compile the
   project, and doesn't want to create any new modules,
 - it means that project trees don't have to be updated every time a
   change is made to the module instantiation stuff.

scripts/build.sdcc.firmware/build.firmware

@@ -0,0 +1,41 @@
+# These are external variables, and shouldn't clash with anything else
+#  @NAME@
+#  @NAME@_BUILT
+#
+
+if [ -z ${@NAME@_BUILT} ]
+then
+    @NAME@="obj/@NAME@.hex"
+    EXTRAS="@TODO@" # cflags, libs
+
+    echo "Building firmware ${@NAME@}..."
+
+    do_cmd source src/@NAME@/build.monolithic || return 1
+
+    MODIFIED=0
+    for test in ${MONOLITHIC_TESTS} ${SRC}
+    do
+        if [ ${test} -nt ${@NAME@} ]
+        then
+            MODIFIED=1
+            break
+        fi
+    done
+
+    if [ ${MODIFIED} -ne 0 ]
+    then
+        echo " Compiling..."
+
+        do_cmd ${SDCC} ${SDCCFLAGS} -o "${@NAME@}" ${SRC} ${EXTRAS} || return 1
+
+        print_success "Firmware built"
+    else
+        print_success "Firmware up to date"
+    fi
+
+    @NAME@_BUILT=1
+
+fi
+
+# kate: replace-trailing-space-save true; space-indent true; tab-width 4;
+# vim: expandtab:ts=4:sw=4