New configure meta-operation implementation

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

1 files changed, 14 insertions, 0 deletions

diff --git a/build/rule b/build/rule
index 5339b40..af1bcc8 100644
--- a/build/rule
+++ b/build/rule
@@ -116,6 +116,20 @@ namespace build
 
     static fsdir_rule instance;
   };
+
+  // Fallback rule that always matches and does nothing.
+  //
+  class fallback_rule: public build::rule
+  {
+  public:
+    virtual match_result
+    match (action, target& t, const std::string&) const {return t;}
+
+    virtual recipe
+    apply (action, target&, const match_result&) const {return noop_recipe;}
+
+    static fallback_rule instance;
+  };
 }
 
 #endif // BUILD_RULE