From 4168cda2363f3d796d0b9922852e249aac3131ba Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 4 Dec 2020 08:39:35 +0200
Subject: Mark Buildfile functions as pure or impure

---
 libbuild2/config/functions.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'libbuild2/config')

diff --git a/libbuild2/config/functions.cxx b/libbuild2/config/functions.cxx
index aaf74ec..5e85238 100644
--- a/libbuild2/config/functions.cxx
+++ b/libbuild2/config/functions.cxx
@@ -27,7 +27,9 @@ namespace build2
       // config module creation was requested for other meta-operations with
       // config.config.module=true in bootstrap.build.
       //
-      f[".save"] = [] (const scope* s)
+      // Note that this function is not pure.
+      //
+      f.insert (".save", false) += [] (const scope* s)
       {
         if (s == nullptr)
           fail << "config.save() called out of scope" << endf;
-- 
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