From 682836daacdd3dc486187c9d60479b372895a470 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 29 Jul 2017 10:32:36 +0200
Subject: Implement "see through" installation semantics for utility libraries

---
 build2/install/rule.hxx | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'build2/install/rule.hxx')

diff --git a/build2/install/rule.hxx b/build2/install/rule.hxx
index 76259c9..ad0d8ec 100644
--- a/build2/install/rule.hxx
+++ b/build2/install/rule.hxx
@@ -19,6 +19,8 @@ namespace build2
     class alias_rule: public rule
     {
     public:
+      static const alias_rule instance;
+
       alias_rule () {}
 
       virtual match_result
@@ -26,6 +28,12 @@ namespace build2
 
       virtual recipe
       apply (action, target&) const override;
+
+      // Return NULL if this prerequisite should be ignored and pointer to its
+      // target otherwise. The default implementation accepts all prerequsites.
+      //
+      virtual const target*
+      filter (action, const target&, prerequisite_member) const;
     };
 
     struct install_dir;
@@ -33,6 +41,8 @@ namespace build2
     class file_rule: public rule
     {
     public:
+      static const file_rule instance;
+
       file_rule () {}
 
       virtual match_result
-- 
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