New configure meta-operation implementation

Now we search and match (but do not execute) a rule for every
operation supported by the project.

3 files changed, 16 insertions, 6 deletions

diff --git a/build/cxx/compile.cxx b/build/cxx/compile.cxx
index bb42c30..514c57a 100644
--- a/build/cxx/compile.cxx
+++ b/build/cxx/compile.cxx
@@ -129,11 +129,12 @@ namespace build
         t.prerequisite_targets.push_back (&pt);
       }
 
-      // Inject additional prerequisites. We only do it for update
-      // since chances are we will have to update some of our
-      // prerequisites in the process (auto-generated source code).
+      // Inject additional prerequisites. We only do it when
+      // performing update since chances are we will have to
+      // update some of our prerequisites in the process (auto-
+      // generated source code).
       //
-      if (a.operation () == update_id)
+      if (a == perform_update_id)
       {
         // The cached prerequisite target should be the same as what
         // is in t.prerequisite_targets since we used standard
@@ -151,7 +152,7 @@ namespace build
       {
       case perform_update_id: return &perform_update;
       case perform_clean_id: return &perform_clean;
-      default: assert (false); return default_recipe;
+      default: return noop_recipe; // Configure update.
       }
     }
 
diff --git a/build/cxx/link.cxx b/build/cxx/link.cxx
index 9602e75..3b628b5 100644
--- a/build/cxx/link.cxx
+++ b/build/cxx/link.cxx
@@ -722,7 +722,7 @@ namespace build
       {
       case perform_update_id: return &perform_update;
       case perform_clean_id: return &perform_clean;
-      default: assert (false); return default_recipe;
+      default: return noop_recipe; // Configure update.
       }
     }
 
diff --git a/build/cxx/module.cxx b/build/cxx/module.cxx
index c2469d9..7171738 100644
--- a/build/cxx/module.cxx
+++ b/build/cxx/module.cxx
@@ -79,6 +79,15 @@ namespace build
         rs.insert<libso> (perform_id, update_id, "cxx", link::instance);
         rs.insert<libso> (perform_id, clean_id, "cxx", link::instance);
 
+        // Register for configure so that we detect unresolved imports
+        // during configuration rather that later, e.g., during update.
+        //
+        rs.insert<obja> (configure_id, update_id, "cxx", compile::instance);
+        rs.insert<objso> (configure_id, update_id, "cxx", compile::instance);
+        rs.insert<exe> (configure_id, update_id, "cxx", link::instance);
+        rs.insert<liba> (configure_id, update_id, "cxx", link::instance);
+        rs.insert<libso> (configure_id, update_id, "cxx", link::instance);
+
         //@@ Should we check if install module was loaded (see bin)?
         //
         rs.insert<exe> (perform_id, install_id, "cxx", install::instance);