[Boost-commit] svn:boost r54891 - trunk/tools/build/v2/util

Subject: [Boost-commit] svn:boost r54891 - trunk/tools/build/v2/util
From: ghost_at_[hidden]
Date: 2009-07-11 10:42:30

Author: vladimir_prus
Date: 2009-07-11 10:42:30 EDT (Sat, 11 Jul 2009)
New Revision: 54891
URL: http://svn.boost.org/trac/boost/changeset/54891

Log:
Add support for options with implied values.

Text files modified: 
   trunk/tools/build/v2/util/option.jam |    26 +++++++++++++++++---------              
   1 files changed, 17 insertions(+), 9 deletions(-)

Modified: trunk/tools/build/v2/util/option.jam
==============================================================================
--- trunk/tools/build/v2/util/option.jam	(original)
+++ trunk/tools/build/v2/util/option.jam	2009-07-11 10:42:30 EDT (Sat, 11 Jul 2009)
@@ -13,21 +13,29 @@
     .option.$(name) = $(value) ;
 }
 
-rule get ( name : default-value ? )
+rule get ( name : default-value ? : implied-value ? )
 {
     local m = [ MATCH --$(name)=(.*) : [ modules.peek : ARGV ] ] ;
     if $(m)
     {
         return $(m[1]) ;
     }
-    else if $(.option.$(name))
-    {
-        return $(.option.$(name)) ;
-    }    
-    else
-    {
-        return $(default-value) ;
-    }
+    else  
+    {        
+        m = [ MATCH (--$(name)) : [ modules.peek : ARGV ] ] ;
+        if $(m) && $(implied-value)
+        {
+            return $(implied-value) ;
+        }
+        else if $(.option.$(name))
+        {
+            return $(.option.$(name)) ;
+        }    
+        else
+        {
+            return $(default-value) ;
+        }    
+    }              
 }