1 files changed, 3 insertions, 112 deletions
diff --git a/build/algorithm.cxx b/build/algorithm.cxx
index 82286f5..9f428b3 100644
--- a/build/algorithm.cxx
+++ b/build/algorithm.cxx
@@ -250,118 +250,9 @@ namespace build
   }
 
   target_state
-  execute_prerequisites (action a, target& t)
+  noop_action (action, target&)
   {
-    target_state ts (target_state::unchanged);
-
-    if (t.group != nullptr)
-      ts = execute_prerequisites (a, *t.group);
-
-    for (target* pt: t.prerequisites)
-    {
-      if (pt == nullptr) // Skip ignored.
-        continue;
-
-      if (execute (a, *pt) == target_state::changed)
-        ts = target_state::changed;
-    }
-
-    return ts;
-  }
-
-  target_state
-  reverse_execute_prerequisites (action a, target& t)
-  {
-    target_state ts (target_state::unchanged);
-
-    for (target* pt: reverse_iterate (t.prerequisites))
-    {
-      if (pt == nullptr) // Skip ignored.
-        continue;
-
-      if (execute (a, *pt) == target_state::changed)
-        ts = target_state::changed;
-    }
-
-    if (t.group != nullptr)
-    {
-      if (reverse_execute_prerequisites (a, *t.group) == target_state::changed)
-        ts = target_state::changed;
-    }
-
-    return ts;
-  }
-
-  bool
-  execute_prerequisites (action a, target& t, const timestamp& mt)
-  {
-    bool e (mt == timestamp_nonexistent);
-
-    if (t.group != nullptr)
-    {
-      if (execute_prerequisites (a, *t.group, mt))
-        e = true;
-    }
-
-    for (target* pt: t.prerequisites)
-    {
-      if (pt == nullptr) // Skip ignored.
-        continue;
-
-      target_state ts (execute (a, *pt));
-
-      if (!e)
-      {
-        // If this is an mtime-based target, then compare timestamps.
-        //
-        if (auto mpt = dynamic_cast<const mtime_target*> (pt))
-        {
-          timestamp mp (mpt->mtime ());
-
-          // What do we do if timestamps are equal? This can happen, for
-          // example, on filesystems that don't have subsecond resolution.
-          // There is not much we can do here except detect the case where
-          // the prerequisite was changed in this run which means the
-          // action must be executed on the target as well.
-          //
-          if (mt < mp || (mt == mp && ts == target_state::changed))
-            e = true;
-        }
-        else
-        {
-          // Otherwise we assume the prerequisite is newer if it was changed.
-          //
-          if (ts == target_state::changed)
-            e = true;
-        }
-      }
-    }
-
-    return e;
-  }
-
-  target_state
-  perform_clean_file (action a, target& t)
-  {
-    // The reverse order of update: first delete the file, then clean
-    // prerequisites.
-    //
-    file& ft (dynamic_cast<file&> (t));
-
-    bool r (rmfile (ft.path (), ft));
-
-    // Update timestamp in case there are operations after us that
-    // could use the information.
-    //
-    ft.mtime (timestamp_nonexistent);
-
-    // Clean prerequisites.
-    //
-    target_state ts (target_state::unchanged);
-
-    if (!t.prerequisites.empty ())
-      ts = reverse_execute_prerequisites (a, t);
-
-    return r ? target_state::changed : ts;
+    assert (false); // We shouldn't be called, see target::recipe().
+    return target_state::unchanged;
   }
 }