boost: Fix boost::BOOST_FOREACH errors

Fixed by adding a patch against 1.48.0. HEAD url also added.

Closes Homebrew/homebrew#8763.

Signed-off-by: Charlie Sharpsteen <source@sharpsteen.net>

Formula/boost.rb

@@ -4,11 +4,24 @@ class Boost < Formula
   homepage 'http://www.boost.org'
   url 'http://downloads.sourceforge.net/project/boost/boost/1.48.0/boost_1_48_0.tar.bz2'
   md5 'd1e9a7a7f532bb031a3c175d86688d95'
+  head 'http://svn.boost.org/svn/boost/trunk', :using => :svn
 
   # Bottle built on 10.7.2 using XCode 4.2
   bottle 'https://downloads.sourceforge.net/project/machomebrew/Bottles/boost-1.48.0-bottle.tar.gz'
   bottle_sha1 'd5edc2714c4182081d0399f0a0278672e1c85410'
 
+  def patches
+    # https://svn.boost.org/trac/boost/ticket/6131
+    #
+    # #define foreach BOOST_FOREACH causes weird compile error in certain
+    # circumstances with boost 1.48
+    #
+    # #define foreach BOOST_FOREACH causes compile error "'boost::BOOST_FOREACH'
+    # has not been declared" on its line if it appears after #include
+    # <boost/foreach.hpp> and before certain other boost headers.
+    DATA
+  end
+
   def options
     [
       ["--with-mpi", "Enable MPI support"],
@@ -73,3 +86,64 @@ class Boost < Formula
     system "./bjam", *args
   end
 end
+__END__
+Index: /boost/foreach_fwd.hpp
+===================================================================
+--- /boost/foreach_fwd.hpp  (revision 62661)
++++ /boost/foreach_fwd.hpp  (revision 75540)
+@@ -15,4 +15,6 @@
+ #define BOOST_FOREACH_FWD_HPP
+
++#include <utility> // for std::pair
++
+ // This must be at global scope, hence the uglified name
+ enum boost_foreach_argument_dependent_lookup_hack
+@@ -26,4 +28,7 @@
+ namespace foreach
+ {
++    template<typename T>
++    std::pair<T, T> in_range(T begin, T end);
++
+     ///////////////////////////////////////////////////////////////////////////////
+     // boost::foreach::tag
+@@ -47,4 +52,22 @@
+ } // namespace foreach
+
++// Workaround for unfortunate https://svn.boost.org/trac/boost/ticket/6131
++namespace BOOST_FOREACH
++{
++    using foreach::in_range;
++    using foreach::tag;
++
++    template<typename T>
++    struct is_lightweight_proxy
++      : foreach::is_lightweight_proxy<T>
++    {};
++
++    template<typename T>
++    struct is_noncopyable
++      : foreach::is_noncopyable<T>
++    {};
++
++} // namespace BOOST_FOREACH
++
+ } // namespace boost
+
+Index: /boost/foreach.hpp
+===================================================================
+--- /boost/foreach.hpp  (revision 75077)
++++ /boost/foreach.hpp  (revision 75540)
+@@ -166,5 +166,5 @@
+ //   at the global namespace for your type.
+ template<typename T>
+-inline boost::foreach::is_lightweight_proxy<T> *
++inline boost::BOOST_FOREACH::is_lightweight_proxy<T> *
+ boost_foreach_is_lightweight_proxy(T *&, BOOST_FOREACH_TAG_DEFAULT) { return 0; }
+
+@@ -191,5 +191,5 @@
+ //   at the global namespace for your type.
+ template<typename T>
+-inline boost::foreach::is_noncopyable<T> *
++inline boost::BOOST_FOREACH::is_noncopyable<T> *
+ boost_foreach_is_noncopyable(T *&, BOOST_FOREACH_TAG_DEFAULT) { return 0; }
+