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/algorithm.txx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'build/algorithm.txx')

diff --git a/build/algorithm.txx b/build/algorithm.txx
index 4c9a673..1e22be1 100644
--- a/build/algorithm.txx
+++ b/build/algorithm.txx
@@ -18,9 +18,10 @@ namespace build
 
     for (const prerequisite& p: t.prerequisites)
     {
-      assert (p.target != nullptr);
-      target& pt (*p.target);
+      if (p.target == nullptr) // Skip ignored.
+        continue;
 
+      target& pt (*p.target);
       target_state ts (execute (a, pt));
 
       if (!e)
-- 
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