From b2fc1fb4a13ffa58640333a3909dd0e53bd21995 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 31 May 2017 16:29:33 +0200
Subject: Adjust extension semantics in file rule to match
 search_existing_file()

---
 build2/rule.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'build2/rule.cxx')

diff --git a/build2/rule.cxx b/build2/rule.cxx
index a462e58..a48fef2 100644
--- a/build2/rule.cxx
+++ b/build2/rule.cxx
@@ -67,7 +67,12 @@ namespace build2
             // derivation function to treat this as prerequisite (just like
             // in search_existing_file()).
             //
-            pt.derive_extension (nullptr, true);
+            if (pt.derive_extension (true) == nullptr)
+            {
+              l4 ([&]{trace << "no default extension for target " << pt;});
+              return false;
+            }
+
             p = &pt.derive_path ();
           }
 
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