id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
2961	Boost 1.38.0 fails to compile on g++-4.0.2	Alex Shapiro <alexsh@…>	John Maddock	"Boost 1.38.0 fails to compile on g++-4.0.2 on x86 Linux (while -4.0.1 is a tested target). The code compiles on g++-3.4.3.

The offending file is source:/tags/release/Boost_1_38_0/boost/math/policies/policy.hpp . I'm sorry, that I don't have the full error message here, it's at work, and I don't have the specific compiler setup at home.

{{{
namespace detail{

template <class A1, 
          class A2, 
          class A3,
          class A4,
          class A5,
          class A6,
          class A7,
          class A8,
          class A9,
          class A10,
          class A11>
char test_is_policy(const policy<A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11>*);
double test_is_policy(...);

template <class P>
struct is_policy_imp
{
   BOOST_STATIC_CONSTANT(bool, value = (sizeof(test_is_policy(static_cast<P*>(0))) == 1));
};

}
}}}

The error says that:
{{{ ""test_is_policy"" undefined at scope }}}, at line {{{ BOOST_STATIC_CONSTANT(bool, value = (sizeof(test_is_policy(static_cast<P*>(0))) == 1)); }}}

Solution:

Replace {{{ sizeof(test_is_policy(static_cast<P*>(0))) }}} with {{{ sizeof(boost::math::policy::detail::test_is_policy(static_cast<P*>(0))) }}}

Note: the same fix probably applies to source:/trunk/boost/math/policies/policy.hpp"	Bugs	closed	To Be Determined	math	Boost 1.38.0	Showstopper	fixed	4.0.2, math, test_is_policy