id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12805	Build time config is not consistent with compile time config macros.	Kohei Takahashi	John Maddock	"Some permissive compilers allow to use some of c++11 (or 14/1z/...) features as a extension: e.g. clang allows using of rvalue references in gnu++98 mode.
In that case, build time config (i.e. cxx11_rvalue_references) tells `yes` but `boost/config.hpp` defines `BOOST_NO_CXX11_RVALUE_REFERENCES` and `<utility>` doesn't define `std::move`, `std::forward`, and so on.
Thus, the regression tests that depending on macros will be issued and failure.

This is not only clang and rv-ref combination but also any other compiler and feature combinations: gcc allows lambda in gnu++98 mode but clang doesn't.

IMO, the build time config should be compliant compile time config than compiler error.
Any thoughts?"	Support Requests	closed	To Be Determined	config	Boost Development Trunk	Problem	fixed