3 files changed, 17 insertions, 2 deletions
diff --git a/build/config/module.cxx b/build/config/module.cxx
index bbaccdc..b184286 100644
--- a/build/config/module.cxx
+++ b/build/config/module.cxx
@@ -8,6 +8,8 @@
 #include <build/scope>
 #include <build/diagnostics>
 
+#include <build/config/operation>
+
 using namespace std;
 
 namespace build
@@ -28,12 +30,18 @@ namespace build
     {
       tracer trace ("config::load");
 
+      //@@ TODO: avoid multiple loads (generally, for modules).
+      //
+      level4 ([&]{trace << "for " << root.path () << '/';});
+
       if (&root != &base)
         fail (l) << "config module must be loaded in project root scope";
 
-      //@@ TODO: avoid multiple loads (generally, for modules).
+      // Register meta-operations.
       //
-      level4 ([&]{trace << "for " << root.path () << '/';});
+      if (root.meta_operations.insert (configure) != configure_id ||
+          root.meta_operations.insert (disfigure) != disfigure_id)
+        fail (l) << "config module must be loaded before other modules";
 
       // Register the build/config.build loading trigger.
       //
diff --git a/build/config/operation b/build/config/operation
index a233e63..cfd04c3 100644
--- a/build/config/operation
+++ b/build/config/operation
@@ -11,6 +11,11 @@ namespace build
 {
   namespace config
   {
+    const meta_operation_id configure_id = 2;
+    const meta_operation_id disfigure_id = 3;
+
+    extern meta_operation_info configure;
+    extern meta_operation_info disfigure;
   }
 }
 
diff --git a/build/config/operation.cxx b/build/config/operation.cxx
index cc04929..c004a0d 100644
--- a/build/config/operation.cxx
+++ b/build/config/operation.cxx
@@ -10,5 +10,7 @@ namespace build
 {
   namespace config
   {
+    meta_operation_info configure {"configure"};
+    meta_operation_info disfigure {"disfigure"};
   }
 }