From 5c8de4f515c99d894bec764a6793352c9cad0825 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 16 Jun 2017 16:22:48 +0200
Subject: Add support for explicitly specifying module name on mxx{} target

---
 build2/algorithm.ixx | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'build2/algorithm.ixx')

diff --git a/build2/algorithm.ixx b/build2/algorithm.ixx
index 27759c9..4885ecf 100644
--- a/build2/algorithm.ixx
+++ b/build2/algorithm.ixx
@@ -29,6 +29,38 @@ namespace build2
     return *r;
   }
 
+  const target*
+  search_existing_target (const prerequisite_key&); // <build2/search.hxx>
+
+  const target*
+  import_existing (const prerequisite_key&); // <build2/file.hxx>
+
+  inline const target*
+  search_existing (const prerequisite& p)
+  {
+    assert (phase == run_phase::match); // Could be relaxed.
+
+    const target* r (p.target.load (memory_order_consume));
+
+    if (r == nullptr)
+    {
+      const prerequisite_key& pk (p.key ());
+      r = pk.proj ? import_existing (pk) : search_existing_target (pk);
+
+      if (r != nullptr)
+      {
+        const target* e (nullptr);
+        if (!p.target.compare_exchange_strong (
+              e, r,
+              memory_order_release,
+              memory_order_consume))
+          assert (e == r);
+      }
+    }
+
+    return r;
+  }
+
   inline const target&
   search (const target& t, const target_type& tt, const prerequisite_key& k)
   {
-- 
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