From 921c2d503a63f4769fdf1c7e6eb31be2706f9bea Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 15 Oct 2020 14:20:44 +0200
Subject: Add ability to specify fallback value for NULL substitutions with
 in.null

---
 libbuild2/version/rule.cxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'libbuild2/version/rule.cxx')

diff --git a/libbuild2/version/rule.cxx b/libbuild2/version/rule.cxx
index 6fd97ae..919dfcf 100644
--- a/libbuild2/version/rule.cxx
+++ b/libbuild2/version/rule.cxx
@@ -88,7 +88,8 @@ namespace build2
     lookup (const location& l,
             action a,
             const target& t,
-            const string& n) const
+            const string& n,
+            const optional<string>& null) const
     {
       // Note that this code will be executed during up-to-date check for each
       // substitution so let's try not to do anything overly sub-optimal here.
@@ -108,7 +109,8 @@ namespace build2
         return rule::lookup (l, // Standard lookup.
                              a,
                              t,
-                             p == string::npos ? n : string (n, p + 1));
+                             p == string::npos ? n : string (n, p + 1),
+                             null);
       }
 
       string pn (n, 0, p);
-- 
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