From 53f02bf28dae507a51515ed6ac03226d68816494 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 2 Feb 2017 10:20:50 +0200
Subject: Store extension in target map key rather than in target

This is in preparation for locking its modification/access.
---
 build2/target-key | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

(limited to 'build2/target-key')

diff --git a/build2/target-key b/build2/target-key
index 7905f8a..0eae11f 100644
--- a/build2/target-key
+++ b/build2/target-key
@@ -26,9 +26,7 @@ namespace build2
     const dir_path* const dir; // Can be relative if part of prerequisite_key.
     const dir_path* const out; // Can be relative if part of prerequisite_key.
     const string* const name;
-    const optional<string>& ext;
-
-    static const optional<string> nullext;
+    mutable optional<string> ext; // Absent - unspecified, empty - none.
 
     template <typename T>
     bool is_a () const {return type->is_a<T> ();}
-- 
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