Subject: [boost] [function] Placement new warnings from gcc 6
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2016-04-01 04:11:47
Hi,
In my tests on gcc 6 I'm seeing these warnings which stem from
Boost.Function:
../boost/function/function_template.hpp:572:11: warning: placement new
constructing an object of type
'boost::spirit::qi::detail::parser_binder<boost::spirit::qi::sequence<boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned
int, 10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>, boost::fusion::nil_> > > > > > > >, mpl_::bool_<false> >'
and size '8' in a region of type 'char' and size '1' [-Wplacement-new=]
../boost/function/function_base.hpp:308:13: warning: placement new
constructing an object of type
'boost::detail::function::functor_manager_common<boost::spirit::qi::detail::parser_binder<boost::spirit::qi::sequence<boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned
int, 10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>, boost::fusion::nil_> > > > > > > >, mpl_::bool_<false> >
>::functor_type {aka
boost::spirit::qi::detail::parser_binder<boost::spirit::qi::sequence<boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned
int, 10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>,
boost::fusion::cons<boost::spirit::qi::literal_char<boost::spirit::char_encoding::standard,
true, false>,
boost::fusion::cons<boost::spirit::qi::any_uint_parser<unsigned int,
10u, 1u, -1>, boost::fusion::nil_> > > > > > > >, mpl_::bool_<false> >}'
and size '8' in a region of type 'char' and size '1' [-Wplacement-new=]
I'm not familiar with boost::function internals, but the warning looks
serious enough to do something about it. I.e. if it's actually benign,
it would be nice to silence it to avoid causing panic.