Added primitive control for inter-module dependence

src/maketools/check_module.sh

+#!/bin/bash
+
+dir=$1
+
+msg="ERROR: this module depends on $dir, which is presently disabled"
+
+cd ../
+
+if test -f $dir/module.type
+then
+  case "$(cat "$dir/module.type")" in
+  (always) exit 0 ;;
+  (default-on)
+    if  test -f $dir.off
+    then
+      echo "$msg"
+      exit 1
+    else 
+      exit 0
+    fi ;;
+  (default-off)
+    if  test -f $dir.on
+    then
+      exit 0
+    else 
+      echo "$msg"
+      exit 1
+    fi ;;
+  esac
+fi
+

src/maketools/make.module

@@ -25,6 +25,7 @@ DEP=$(addprefix deps/,$(SRC:.cpp=.d))
 all:
 	@echo Creating links to other here to simplify .h inclusion:
 	@for dir in $(USE) ; do test -L $$dir || ln -s ../$$dir . && echo "   " $$dir ;  done
+	@for dir in $(USE) ; do ../maketools/check_module.sh $$dir ;  done
 	@echo Building dependencies
 	@for dir in $(BUILDAFTER) ; do echo "   " $$dir ; cd ../$$dir ; $(MAKE) ; cd - ; done
 	$(MAKE) obj