From c6265603e0e98c19f8d81c8edd5a34a550063c02 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 23 Nov 2016 09:53:18 +0200
Subject: Add support for config.cli=false (leave unconfigured)

---
 build2/config/utility.cxx | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'build2/config/utility.cxx')

diff --git a/build2/config/utility.cxx b/build2/config/utility.cxx
index 9131620..4c0e933 100644
--- a/build2/config/utility.cxx
+++ b/build2/config/utility.cxx
@@ -105,7 +105,7 @@ namespace build2
       return l && !cast<bool> (l);
     }
 
-    void
+    bool
     unconfigured (scope& root, const string& ns, bool v)
     {
       // Note: not overridable.
@@ -115,7 +115,15 @@ namespace build2
       if (current_mif->id == configure_id)
         save_variable (root, var);
 
-      root.assign (var) = !v;
+      value& x (root.assign (var));
+
+      if (x.null || cast<bool> (x) != !v)
+      {
+        x = !v;
+        return true;
+      }
+      else
+        return false;
     }
 
     void
-- 
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