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/in/init.cxx | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'libbuild2/in/init.cxx')

diff --git a/libbuild2/in/init.cxx b/libbuild2/in/init.cxx
index 6cd2f96..18071f8 100644
--- a/libbuild2/in/init.cxx
+++ b/libbuild2/in/init.cxx
@@ -59,6 +59,11 @@ namespace build2
         // unknown substitutions as is.
         //
         vp.insert<string> ("in.substitution");
+
+        // Fallback value to use for NULL value substitutions. If unspecified,
+        // NULL substitutions are an error.
+        //
+        vp.insert<string> ("in.null");
       }
 
       // Register target types.
-- 
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