Move inter-lib dependencies to a project variable and into the build targets.

Author: grafikrobot

build.jam

@@ -5,21 +5,23 @@
 
 require-b2 5.2 ;
 
+constant boost_dependencies :
+    /boost/any//boost_any
+    /boost/bind//boost_bind
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/detail//boost_detail
+    /boost/function//boost_function
+    /boost/iterator//boost_iterator
+    /boost/lexical_cast//boost_lexical_cast
+    /boost/smart_ptr//boost_smart_ptr
+    /boost/static_assert//boost_static_assert
+    /boost/throw_exception//boost_throw_exception
+    /boost/tokenizer//boost_tokenizer
+    /boost/type_traits//boost_type_traits ;
+
 project /boost/program_options
     : common-requirements
-        <library>/boost/any//boost_any
-        <library>/boost/bind//boost_bind
-        <library>/boost/config//boost_config
-        <library>/boost/core//boost_core
-        <library>/boost/detail//boost_detail
-        <library>/boost/function//boost_function
-        <library>/boost/iterator//boost_iterator
-        <library>/boost/lexical_cast//boost_lexical_cast
-        <library>/boost/smart_ptr//boost_smart_ptr
-        <library>/boost/static_assert//boost_static_assert
-        <library>/boost/throw_exception//boost_throw_exception
-        <library>/boost/tokenizer//boost_tokenizer
-        <library>/boost/type_traits//boost_type_traits
         <include>include
     ;
 
@@ -31,3 +33,4 @@ explicit
 call-if : boost-library program_options
     : install boost_program_options
     ;
+

build/Jamfile.v2

@@ -1,6 +1,7 @@
 
 project
     : source-location ../src
+    : common-requirements <library>$(boost_dependencies)
     ;
 
 SOURCES =