[Bug 1709396] Re: gcc-7/i386|armhf 12.1.2 FTBFS

[James Page]

code that's causing this ambiguity:

            static int initialize(void* dest, param_T operand)
            {
                typedef typename boost::detail::make_reference_content<
                      recursive_enabled_T
                    >::type internal_T;

                new(dest) internal_T(operand);
                return BOOST_MPL_AUX_VALUE_WKND(index)::value; // which
            }

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
            static int initialize(void* dest, param2_T operand)
            {
                // This assert must newer trigger, because all the reference contents are
                // handled by the initilize(void* dest, param_T operand) function above
                BOOST_ASSERT(!is_reference_content_t::value);

                typedef typename boost::mpl::if_<is_reference_content_t, param2_T, recursive_enabled_T>::type value_T;
                new(dest) value_T( boost::detail::variant::move(operand) );
                return BOOST_MPL_AUX_VALUE_WKND(index)::value; // which
            }
#endif


gcc definition for this flag:

// C++0x features in 4.3.n and later
//
#if (BOOST_GCC_VERSION >= 40300) && defined(BOOST_GCC_CXX11)
// C++0x features are only enabled when -std=c++0x or -std=gnu++0x are
// passed on the command line, which in turn defines
// __GXX_EXPERIMENTAL_CXX0X__.
#  define BOOST_HAS_DECLTYPE
#  define BOOST_HAS_RVALUE_REFS
#  define BOOST_HAS_STATIC_ASSERT
#  define BOOST_HAS_VARIADIC_TMPL
#else
#  define BOOST_NO_CXX11_DECLTYPE
#  define BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS
#  define BOOST_NO_CXX11_RVALUE_REFERENCES
#  define BOOST_NO_CXX11_STATIC_ASSERT
#endif

and

#if defined(__GXX_EXPERIMENTAL_CXX0X__) || (__cplusplus >= 201103L)
#  define BOOST_GCC_CXX11
#endif

-- 
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https://bugs.launchpad.net/bugs/1709396

Title:
  gcc-7/i386|armhf 12.1.2 FTBFS

Status in ceph package in Ubuntu:
  New
Status in gcc-7 package in Ubuntu:
  New

Bug description:
  ceph 12.1.2 fails to build with gcc-7 on 32 bit architectures (i386 or
  armhf):

  In file included from /usr/include/boost/variant.hpp:17:0,
                   from /root/ceph/src/common/cmdparse.h:9,
                   from /root/ceph/src/common/ceph_context.h:22,
                   from /root/ceph/src/common/Mutex.h:20,
                   from /root/ceph/src/common/config.h:21,
                   from /root/ceph/src/common/dout.h:22,
                   from /root/ceph/src/include/Context.h:19,
                   from /root/ceph/src/common/Cond.h:19,
                   from /root/ceph/src/common/Timer.h:18,
                   from /root/ceph/src/tools/rbd_mirror/InstanceReplayer.cc:5:
  /usr/include/boost/variant/variant.hpp: In instantiation of ‘void boost::variant<T0, TN>::convert_construct(T&, int, mpl_::false_) [with T = unsigned int; T0_ = bool; TN = {long long unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >}; mpl_::false_ = mpl_::bool_<false>]’:
  /usr/include/boost/variant/variant.hpp:1777:26:   required from ‘boost::variant<T0, TN>::variant(T&, typename boost::enable_if<boost::mpl::and_<boost::mpl::not_<boost::is_const<T> >, boost::mpl::not_<boost::is_same<T, boost::variant<T0, TN> > >, boost::detail::variant::is_variant_constructible_from<T&, typename boost::mpl::transform<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, boost::mpl::transform<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_sequence_based_, typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, boost::detail::variant::make_variant_list<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, TN ...> >::type, boost::mpl::protect<boost::detail::variant::quoted_enable_recursive<boost::variant<T0, TN> > > >, boost::mpl::identity<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_sequence_based_, typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, boost::detail::variant::make_variant_list<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, TN ...> >::type> >::type, boost::mpl::protect<boost::detail::make_reference_content<mpl_::void_> > >::type> > >::type*) [with T = unsigned int; T0_ = bool; TN = {long long unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >}; typename boost::enable_if<boost::mpl::and_<boost::mpl::not_<boost::is_const<T> >, boost::mpl::not_<boost::is_same<T, boost::variant<T0, TN> > >, boost::detail::variant::is_variant_constructible_from<T&, typename boost::mpl::transform<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, boost::mpl::transform<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_sequence_based_, typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, boost::detail::variant::make_variant_list<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, TN ...> >::type, boost::mpl::protect<boost::detail::variant::quoted_enable_recursive<boost::variant<T0, TN> > > >, boost::mpl::identity<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_sequence_based_, typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, boost::detail::variant::make_variant_list<typename boost::mpl::eval_if<boost::variant<T0, TN>::is_recursive_, T0_, boost::mpl::identity<T> >::type, TN ...> >::type> >::type, boost::mpl::protect<boost::detail::make_reference_content<mpl_::void_> > >::type> > >::type = void]’
  /root/ceph/src/tools/rbd_mirror/InstanceReplayer.cc:355:3:   required from ‘void rbd::mirror::InstanceReplayer<ImageCtxT>::start_image_replayers(int) [with ImageCtxT = librbd::ImageCtx]’
  /root/ceph/src/tools/rbd_mirror/InstanceReplayer.cc:496:29:   required from here
  /usr/include/boost/variant/variant.hpp:1604:38: error: call of overloaded ‘initialize(void*, unsigned int&)’ is ambiguous
                 initializer::initialize(
                 ~~~~~~~~~~~~~~~~~~~~~~~^
                     storage_.address()
                     ~~~~~~~~~~~~~~~~~~  
                   , operand
                   ~~~~~~~~~             
                   )
                   ~                     
  In file included from /usr/include/boost/variant/variant.hpp:30:0,
                   from /usr/include/boost/variant.hpp:17,
                   from /root/ceph/src/common/cmdparse.h:9,
                   from /root/ceph/src/common/ceph_context.h:22,
                   from /root/ceph/src/common/Mutex.h:20,
                   from /root/ceph/src/common/config.h:21,
                   from /root/ceph/src/common/dout.h:22,
                   from /root/ceph/src/include/Context.h:19,
                   from /root/ceph/src/common/Cond.h:19,
                   from /root/ceph/src/common/Timer.h:18,
                   from /root/ceph/src/tools/rbd_mirror/InstanceReplayer.cc:5:
  /usr/include/boost/variant/detail/initializer.hpp:104:24: note: candidate: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param_T) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >; Iterator = boost::mpl::l_iter<boost::mpl::list3<bool, long long unsigned int, std::__cxx11::basic_string<char> > >; boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param_T = const bool&]
               static int initialize(void* dest, param_T operand)
                          ^~~~~~~~~~
  /usr/include/boost/variant/detail/initializer.hpp:115:24: note: candidate: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param2_T) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >; Iterator = boost::mpl::l_iter<boost::mpl::list3<bool, long long unsigned int, std::__cxx11::basic_string<char> > >; boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param2_T = bool&&]
               static int initialize(void* dest, param2_T operand)
                          ^~~~~~~~~~
  /usr/include/boost/variant/detail/initializer.hpp:115:24: note: candidate: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param2_T) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::make_initializer_node::apply<boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list3<bool, long long unsigned int, std::__cxx11::basic_string<char> > > >::initializer_node, mpl_::int_<1> >; Iterator = boost::mpl::l_iter<boost::mpl::list2<long long unsigned int, std::__cxx11::basic_string<char> > >; boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param2_T = long long unsigned int&&]
  /usr/include/boost/variant/detail/initializer.hpp:104:24: note: candidate: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param_T) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::make_initializer_node::apply<boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list3<bool, long long unsigned int, std::__cxx11::basic_string<char> > > >::initializer_node, mpl_::int_<1> >; Iterator = boost::mpl::l_iter<boost::mpl::list2<long long unsigned int, std::__cxx11::basic_string<char> > >; boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::param_T = const long long unsigned int&]
               static int initialize(void* dest, param_T operand)
                          ^~~~~~~~~~
  src/tools/rbd_mirror/CMakeFiles/rbd_mirror_internal.dir/build.make:182: recipe for target 'src/tools/rbd_mirror/CMakeFiles/rbd_mirror_internal.dir/InstanceReplayer.cc.o' failed
  make[2]: *** [src/tools/rbd_mirror/CMakeFiles/rbd_mirror_internal.dir/InstanceReplayer.cc.o] Error 1

  Full log:

  https://launchpadlibrarian.net/332283208/buildlog_ubuntu-artful-
  armhf.ceph_12.1.2-0ubuntu1_BUILDING.txt.gz

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