id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
10832	Boost.Variant: variadic templates are disabled on Clang	Benoit Blanchon <benoit@…>	Antony Polukhin	"Clang compiler defines __GNUC__=4 and __GNUC_MINOR__=2, which makes Boost.Variant believe it's building against an old GCC and therefore disable variadic templates.

See this code from variant_fwd.hpp:75:

{{{
#if defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) \
  || (defined(__GNUC__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 7)) \
  || (defined(_MSC_VER) && (_MSC_VER < 1800)) \
  || defined(BOOST_NO_USING_DECLARATION_OVERLOADS_FROM_TYPENAME_BASE) \
  || defined (BOOST_VARIANT_NO_TYPE_SEQUENCE_SUPPORT)

#ifndef BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES
#   define BOOST_VARIANT_DO_NOT_USE_VARIADIC_TEMPLATES
#endif

#endif
}}}


Please include a special case when __clang__ is defined."	Bugs	closed	Boost 1.58.0	variant	Boost 1.57.0	Optimization	fixed	clang