From 7ff233863b9226a59acf49092076fbec541bb11d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 9 Jun 2020 14:08:11 +0200
Subject: Handle empty target_key value (directory) in as_name()

---
 libbuild2/target.cxx | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/libbuild2/target.cxx b/libbuild2/target.cxx
index b65a4fa..e3ad367 100644
--- a/libbuild2/target.cxx
+++ b/libbuild2/target.cxx
@@ -47,15 +47,21 @@ namespace build2
   void target_key::
   as_name (names& r) const
   {
-    string v (*name);
-    target::combine_name (v, ext, false /* @@ TODO: what to do? */);
+    string v;
+    if (!name->empty ())
+    {
+      v = *name;
+      target::combine_name (v, ext, false /* @@ TODO: what to do? */);
+    }
+    else
+      assert (!ext);
 
-    r.push_back (build2::name (*dir, type->name, move (v)));
+    r.emplace_back (*dir, type->name, move (v));
 
     if (!out->empty ())
     {
       r.back ().pair = '@';
-      r.push_back (build2::name (*out));
+      r.emplace_back (*out);
     }
   }
 
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