From f24909d04c3e0db53e7bb58ba8a2dc3eca055f72 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 25 May 2018 14:01:59 +0200
Subject: Fix target locking race in search_library()

---
 build2/cc/common.cxx | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/build2/cc/common.cxx b/build2/cc/common.cxx
index 3c8b115..0778acf 100644
--- a/build2/cc/common.cxx
+++ b/build2/cc/common.cxx
@@ -882,6 +882,14 @@ namespace build2
         }
       }
 
+      // If we have the lock (meaning this is the first time), set the
+      // traget's recipe to noop. Failed that we will keep re-locking it,
+      // updating its members, etc.
+      //
+      if (al) match_recipe (al, noop_recipe);
+      if (sl) match_recipe (sl, noop_recipe);
+      if (ll) match_recipe (ll, noop_recipe);
+
       return r;
     }
 
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