From cf6b3e34b59ad120111e0c1ead779bbb3a70c38d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 12 Mar 2015 15:43:17 +0200
Subject: Implement clean operation

---
 build/target.cxx | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

(limited to 'build/target.cxx')

diff --git a/build/target.cxx b/build/target.cxx
index 5cf131f..15d57ca 100644
--- a/build/target.cxx
+++ b/build/target.cxx
@@ -7,16 +7,29 @@
 #include <build/scope>
 #include <build/search>
 #include <build/context>
+#include <build/algorithm>   // execute_prerequisites()
 #include <build/diagnostics>
 
 using namespace std;
 
 namespace build
 {
-  // target
+  // recipe
   //
-  const recipe target::empty_recipe_;
+  const recipe empty_recipe;
+  const recipe noop_recipe (&noop_recipe_function);
+  const recipe default_recipe (
+    static_cast<recipe_function*> (&execute_prerequisites));
+
+  target_state
+  noop_recipe_function (action, target&)
+  {
+    assert (false); // We shouldn't be called, see target::recipe().
+    return target_state::unchanged;
+  }
 
+  // target
+  //
   ostream&
   operator<< (ostream& os, const target& t)
   {
-- 
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