From 8ac1daf33da807635eddd881f2b178af8e22863a Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 12 Nov 2019 14:51:02 +0200
Subject: Infra work for customizable config var persistence
 (config.config.persist)

---
 libbuild2/config/utility.hxx | 1 +
 1 file changed, 1 insertion(+)

(limited to 'libbuild2/config/utility.hxx')

diff --git a/libbuild2/config/utility.hxx b/libbuild2/config/utility.hxx
index 2a0909f..7774b68 100644
--- a/libbuild2/config/utility.hxx
+++ b/libbuild2/config/utility.hxx
@@ -143,6 +143,7 @@ namespace build2
     // config::module for details.
     //
     const uint64_t save_commented = 0x01; // Save default value as commented.
+    const uint64_t omit_null      = 0x02; // Treat NULL as undefined.
 
     LIBBUILD2_SYMEXPORT void
     save_variable (scope& root, const variable&, uint64_t flags = 0);
-- 
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