Re: [release[ Boost 1.86.0 Beta 1 Release Candidate is available

From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2024-07-16 11:19:21

On 7/16/24 14:14, Andrey Semashev wrote:
> 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.

Actually, it's been reported already:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105651

> In my experience, this sort of warnings from gcc is completely broken
> and and nothing but spam in the output.
>