From 74c9269e1363e33e4b3223a029049a13e6595e7e Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 4 Nov 2024 07:44:34 +0200
Subject: Redo group_prerequisites to use snapshots of prerequisites (GH issue
 #408)

It turns out both target and group prerequisites can be replaced during
dependency synthesis in more obscure cases.
---
 libbuild2/prerequisite.hxx | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'libbuild2/prerequisite.hxx')

diff --git a/libbuild2/prerequisite.hxx b/libbuild2/prerequisite.hxx
index 9b9cccf..008fc11 100644
--- a/libbuild2/prerequisite.hxx
+++ b/libbuild2/prerequisite.hxx
@@ -190,6 +190,8 @@ namespace build2
   }
 
   using prerequisites = vector<prerequisite>;
+
+  LIBBUILD2_SYMEXPORT extern const prerequisites empty_prerequisites;
 }
 
 #endif // LIBBUILD2_PREREQUISITE_HXX
-- 
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