id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13633	boost/system/error_code.hpp fails to compile on clang-3.6 in gnu++14 mode due to invalid constexpr	Rainer Deyke <rainerd@…>	Beman Dawes	"A minimal test file that includes ""boost/system/error_code.hpp"" fails to compile on my clang-3.6 in gnu++14 mode with the Boost 1.68.0 beta 1.  The exact command line and error message are:

rainer@rainer10:~/work/cpp_test$ schroot -c steamrt_scout_amd64 -- clang-3.6 -std=gnu++14 -c test.cpp -I boost_1_68_0/
In file included from test.cpp:1:
boost_1_68_0/boost/system/error_code.hpp:226:41: error: constexpr constructor
      never produces a constant expression [-Winvalid-constexpr]
        BOOST_SYSTEM_CONSTEXPR explicit std_category( boost::system::err...
                                        ^
boost_1_68_0/boost/system/error_code.hpp:226:41: note: non-constexpr constructor
      'error_category' cannot be used in a constant expression
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/system_error:69:5: note: 
      declared here
    error_category() noexcept;
    ^
1 error generated.

This is a regression from Boost 1.67."	Bugs	new	Boost 1.68.0	system	Boost Release Branch	Showstopper		constexpr