id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11875	Boost.Phoenix should not forward-declare std::unordered_set / map	Jean-Michaël Celerier <jeanmichael.celerier@…>	Thomas Heller	"Boost 1.60 introduced the header boost/phoenix/stl/algorithm/detail/std_unordered_set_or_map_fwd.hpp.

When building on Linux with libstdc++ debug mode (-DGLIBCXX_DEBUG) this causes ambiguous references to the forward-declared classes because in libstdc++ side, they now live in the std::__debug namespace instead.

The following test cases triggers it : 


{{{

#include <boost/spirit/include/phoenix.hpp>
#include <unordered_map>

void f()
{
	std::unordered_map<int, float> map;
}
}}}

when built with

{{{ g++ -std=c++11 -D_GLIBCXX_DEBUG=1 -c problem.cpp }}}
"	Bugs	closed	Boost 1.65.0	phoenix	Boost 1.64.0	Problem	fixed		braden@…