From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2024-07-16 11:14:32
On 7/16/24 13:08, Ruben Perez via Boost wrote:
>
> Other than that, there are numerous warnings, and I assume most (or
> all) of them are spurious. The rest of my email contains the warnings
> I got with the libraries that produced them, in case the authors want
> to fix them.
>
> 1. Boost.Log (warning repeats several times):
> #22 212.1 In file included from /usr/include/c++/13.2.1/string:42,
> #22 212.1 from libs/log/src/date_time_format_parser.cpp:18:
> #22 212.1 In static member function 'static constexpr
> std::char_traits<char>::char_type*
> std::char_traits<char>::copy(char_type*, const char_type*,
> std::size_t)',
> #22 212.1 inlined from 'static constexpr void
> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_S_copy(_CharT*,
> const _CharT*, size_type) [with _CharT = char; _Traits =
> std::char_traits<char>; _Alloc = std::allocator<char>]' at
> /usr/include/c++/13.2.1/bits/basic_string.h:430:21,
> #22 212.1 inlined from 'constexpr std::__cxx11::basic_string<_CharT,
> _Traits, _Allocator>& std::__cxx11::basic_string<_CharT, _Traits,
> _Alloc>::_M_replace(size_type, size_type, const _CharT*, size_type)
> [with _CharT = char; _Traits = std::char_traits<char>; _Alloc =
> std::allocator<char>]' at
> /usr/include/c++/13.2.1/bits/basic_string.tcc:542:16,
> #22 212.1 inlined from 'constexpr std::__cxx11::basic_string<_CharT,
> _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits,
> _Alloc>::replace(size_type, size_type, const _CharT*, size_type) [with
> _CharT = char; _Traits = std::char_traits<char>; _Alloc =
> std::allocator<char>]' at
> /usr/include/c++/13.2.1/bits/basic_string.h:2208:19,
> #22 212.1 inlined from 'constexpr std::__cxx11::basic_string<_CharT,
> _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits,
> _Alloc>::replace(__const_iterator, __const_iterator, const _CharT*,
> const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>;
> _Alloc = std::allocator<char>]' at
> /usr/include/c++/13.2.1/bits/basic_string.h:2417:22,
> #22 212.1 inlined from 'constexpr std::__cxx11::basic_string<_CharT,
> _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits,
> _Alloc>::append(_InputIterator, _InputIterator) [with _InputIterator =
> const char*; <template-parameter-2-2> = void; _CharT = char; _Traits =
> std::char_traits<char>; _Alloc = std::allocator<char>]' at
> /usr/include/c++/13.2.1/bits/basic_string.h:1519:31,
> #22 212.1 inlined from 'void
> boost::log::v2_mt_posix::aux::{anonymous}::common_flags<CallbackT>::add_literal(const
> char_type*, const char_type*) [with CallbackT =
> boost::log::v2_mt_posix::aux::date_format_parser_callback<char>]' at
> libs/log/src/date_time_format_parser.cpp:100:25,
> #22 212.1 inlined from 'void
> boost::log::v2_mt_posix::aux::{anonymous}::parse_format(const CharT*,
> const CharT*, ParserT&, CallbackT&) [with CharT = char; ParserT =
> date_flags<common_flags<boost::log::v2_mt_posix::aux::date_format_parser_callback<char>
>>> ; CallbackT =
> boost::log::v2_mt_posix::aux::date_format_parser_callback<char>]' at
> libs/log/src/date_time_format_parser.cpp:336:35,
> #22 212.1 inlined from 'void
> boost::log::v2_mt_posix::aux::parse_date_format(const CharT*, const
> CharT*, date_format_parser_callback<CharT>&) [with CharT = char]' at
> libs/log/src/date_time_format_parser.cpp:353:17:
> #22 212.1 /usr/include/c++/13.2.1/bits/char_traits.h:435:56: warning:
> 'void* __builtin_memcpy(void*, const void*, long unsigned int)'
> accessing 9223372036854775808 or more bytes at offsets
> [-4611686018427387904, 4611686018427387903] and 0 may overlap up to
> 9223372036854775809 bytes at offset -1 [-Wrestrict]
> #22 212.1 435 | return static_cast<char_type*>(__builtin_memcpy(__s1,
> __s2, __n));
> #22 212.1 | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
Please, report it to gcc devs, it's coming from std::basic_string::append.
In my experience, this sort of warnings from gcc is completely broken
and and nothing but spam in the output.