id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7166	Phoenix unconditionally sets BOOST_PROTO_MAX_ARITY	m.champlon@…	Thomas Heller	"Hi,

The following :
{{{
#define BOOST_PROTO_MAX_ARITY 20
#include <boost/phoenix.hpp>
}}}
exhibits the following warning with msvc 2010 and boost 1.50 :
{{{
1>C:\dev\include\boost/phoenix/core/limits.hpp(19): warning C4005: 'BOOST_PROTO_MAX_ARITY' : macro redefinition
}}}

This is rather inconvenient for the user of several libraries.
I suggest to modify limits.hpp to change :
{{{
#if defined(BOOST_PHOENIX_LIMIT)
#define BOOST_PROTO_MAX_ARITY BOOST_PHOENIX_LIMIT
}}}
to :
{{{
 #if defined(BOOST_PHOENIX_LIMIT)
# if !defined( BOOST_PROTO_MAX_ARITY )
#  define BOOST_PROTO_MAX_ARITY BOOST_PHOENIX_LIMIT
# elif (BOOST_PROTO_MAX_ARITY < BOOST_PHOENIX_LIMIT)
#  error ""BOOST_PROTO_MAX_ARITY is set too low""
# endif
}}}
or see the attached patch.

Thanks,
MAT."	Bugs	closed	To Be Determined	phoenix	Boost 1.50.0	Problem	fixed