From f11d720f2fb62b46ad17d3aa3850140a4839f114 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 13 Dec 2017 14:20:54 +0200
Subject: Implement info meta operation

This meta operation can be used to print basic information (name, version,
source/output roots, etc) for one or more projects.
---
 build2/variable.txx | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'build2/variable.txx')

diff --git a/build2/variable.txx b/build2/variable.txx
index e374f22..c2dbea9 100644
--- a/build2/variable.txx
+++ b/build2/variable.txx
@@ -389,6 +389,9 @@ namespace build2
   }
 
   template <typename T>
+  const vector<T> value_traits<vector<T>>::empty_instance;
+
+  template <typename T>
   const typename value_traits<vector<T>>::value_type_ex
   value_traits<vector<T>>::value_type = build2::value_type // VC14 wants =.
   {
@@ -558,6 +561,9 @@ namespace build2
   }
 
   template <typename K, typename V>
+  const std::map<K,V> value_traits<std::map<K, V>>::empty_instance;
+
+  template <typename K, typename V>
   const typename value_traits<std::map<K, V>>::value_type_ex
   value_traits<std::map<K, V>>::value_type = build2::value_type // VC14 wants =
   {
-- 
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