id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
8772	boost.variant broken in combination with g++ 4.6.x series and C++0x	anonymous	Antony Polukhin	"We observed compilation errors in case the main header of boost.signals2 has been included.

Example code :


{{{
#include <boost/signals2.hpp>

int main() { return 0; }
}}}

The following call fails with errors
{{{
g++-4.6.3 --std=c++0x main.cpp -I /opt/boost_1_54_0/
}}}

The error message points to some sections in boost.variant recently modified for boost 1.54.0 (I attached the rather lengthly error message).

In case c++0x is not activated or a 4.7/4.8-series version is used, the compilation succeeds.

We simply excluded the problematic section in file boost/variant/variant.hpp which resolved our compilation problem.

I saw that the gcc 4.6 series is not in the list of compilers tested with C++11 enabled but for us this section in variant is the first that fails in case the preprocessor macro BOOST_NO_CXX11_RVALUE_REFERENCES is not set.
"	Bugs	closed	Boost 1.55.0	variant	Boost 1.54.0	Regression	fixed	signals2 gcc 4.6.x	antoshkka@…