From dbb7a5ffefefa1e6439464cac47ebfd90a913aa7 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 8 Nov 2018 12:45:33 +0200
Subject: Fix bug in override logic for command line variable with project
 visibility

---
 build2/scope.ixx | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'build2/scope.ixx')

diff --git a/build2/scope.ixx b/build2/scope.ixx
index 9a93e9d..ac71e82 100644
--- a/build2/scope.ixx
+++ b/build2/scope.ixx
@@ -39,4 +39,16 @@ namespace build2
       for (; r->parent_->root_ != nullptr; r = r->parent_->root_) ;
     return r;
   }
+
+  inline bool scope::
+  sub_root (const scope& r) const
+  {
+    // Scan the parent root scope chain looking for this scope.
+    //
+    for (const scope* pr (&r); (pr = pr->parent_->root_) != nullptr; )
+      if (pr == this)
+        return true;
+
+    return false;
+  }
 }
-- 
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