Add armv7 and the new armv7s. Change the -arch option for xcode to allow matching the instructions-set if specified to make it easier to build from within Xcode.

[SVN r80685]

v2/tools/builtin.jam

@@ -300,6 +300,7 @@ feature.feature instruction-set :
 
     # Advanced RISC Machines
     armv2 armv2a armv3 armv3m armv4 armv4t armv5 armv5t armv5te armv6 armv6j iwmmxt ep9312
+	armv7 armv7s
 
     : propagated optional ;
 

v2/tools/darwin.jam

@@ -35,6 +35,8 @@ feature force-load : : free dependency incidental ;
 
 #############################################################################
 
+_ = " " ;
+
 if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
 {
     .debug-configuration = true ;
@@ -376,6 +378,7 @@ rule setup-address-model ( targets * : sources * : properties * )
 {
     local ps = [ property-set.create $(properties) ] ;
     local arch = [ $(ps).get <architecture> ] ;
+    local instruction-set = [ $(ps).get <instruction-set> ] ;
     local address-model = [ $(ps).get <address-model> ] ;
     local osx-version = [ $(ps).get <macosx-version> ] ;
     local gcc-version = [ $(ps).get <toolset-darwin:version> ] ;
@@ -454,8 +457,12 @@ rule setup-address-model ( targets * : sources * : properties * )
         
         case arm :
         {
-            options = -arch armv6 ;
-        }        
+            if $(instruction-set) {
+                options = -arch$(_)$(instruction-set) ;
+            } else {
+                options = -arch arm ;
+            }
+        }
     }
     
     if $(options)
@@ -526,8 +533,6 @@ flags darwin.link FORCE_LOAD <force-load> ;
 # uncomment to see what libtool is doing under the hood
 #~ flags darwin.link.dll OPTIONS : -Wl,-v ;
 
-_ = " " ;
-
 # set up the -F option to include the paths to any frameworks used.
 local rule prepare-framework-path ( target + )
 {