From 8e80e136db26543a93b7bb2c4e845fbf60a6db66 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sun, 28 Aug 2016 19:09:44 +0200
Subject: Limit c.std, cxx.std, and extension visibility to project

---
 build2/c/init.cxx   | 2 +-
 build2/context.cxx  | 2 +-
 build2/cxx/init.cxx | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/build2/c/init.cxx b/build2/c/init.cxx
index d579c90..7d104b0 100644
--- a/build2/c/init.cxx
+++ b/build2/c/init.cxx
@@ -159,7 +159,7 @@ namespace build2
         v["cc.type"],
         v["cc.system"],
 
-        v.insert<string>   ("c.std", true),
+        v.insert<string>   ("c.std", false, variable_visibility::project),
 
         v.insert<string>   ("c.id"),
         v.insert<string>   ("c.id.type"),
diff --git a/build2/context.cxx b/build2/context.cxx
index 422ecac..ac972ac 100644
--- a/build2/context.cxx
+++ b/build2/context.cxx
@@ -230,7 +230,7 @@ namespace build2
       //
       v.insert ("subprojects");
 
-      v.insert<string> ("extension");
+      v.insert<string> ("extension", false, variable_visibility::project);
     }
 
     gs.assign<dir_path> ("build.work") = work;
diff --git a/build2/cxx/init.cxx b/build2/cxx/init.cxx
index d41978c..9aa30dc 100644
--- a/build2/cxx/init.cxx
+++ b/build2/cxx/init.cxx
@@ -159,7 +159,7 @@ namespace build2
         v["cc.type"],
         v["cc.system"],
 
-        v.insert<string>   ("cxx.std", true),
+        v.insert<string>   ("cxx.std", false, variable_visibility::project),
 
         v.insert<string>   ("cxx.id"),
         v.insert<string>   ("cxx.id.type"),
-- 
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