From 410718da929fbdfd4ea048638bd92c5530b17c94 Mon Sep 17 00:00:00 2001
From: Vladimir Prus <ghost@cs.msu.su>
Date: Sun, 22 Oct 2006 17:41:31 +0000
Subject: [PATCH] Automatically set BOOST_BUILD_PCH_ENABLED when pch is
 enabled.

[SVN r35692]
---
 v2/tools/pch.jam | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/v2/tools/pch.jam b/v2/tools/pch.jam
index 575cbf568..e06a92143 100644
--- a/v2/tools/pch.jam
+++ b/v2/tools/pch.jam
@@ -38,6 +38,7 @@ type.register CPP_PCH : : PCH ;
 feature.feature pch :
     on
     off
+  : propagated    
   ;
 
 feature.feature pch-header : : free dependency ;
@@ -74,8 +75,10 @@ class pch-generator : generator
         }
         else
         {
-            return [ run-pch $(project) $(name) : $(property-set) 
-            : $(sources) ] ;
+            local r = [ run-pch $(project) $(name) : $(property-set) 
+              : $(sources) ] ;
+            return [ generators.add-usage-requirements $(r)
+              : <define>BOOST_BUILD_PCH_ENABLED ] ;
         }                        
     }