[Boost-bugs] [Boost C++ Libraries] #10832: Boost.Variant: variadic templates are disabled on Clang

Subject: [Boost-bugs] [Boost C++ Libraries] #10832: Boost.Variant: variadic templates are disabled on Clang
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-12-01 17:45:29

#10832: Boost.Variant: variadic templates are disabled on Clang
----------------------------------------+--------------------------
 Reporter:  Benoit Blanchon <benoit@…>  |      Owner:  ebf
     Type:  Bugs                        |     Status:  new
Milestone:  To Be Determined            |  Component:  variant
  Version:  Boost 1.57.0                |   Severity:  Optimization
 Keywords:  clang                       |
----------------------------------------+--------------------------
 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.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/10832>
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