Memory overflow warning in pattern_formatter-inl.h

[sketch34]

spdlog 1.13.0#0 (via spdlog::spdlog_header_only)
gcc 13.2.0

The warning appears to originate from pattern_formatter-inl.h line 804. It only occurs for me when compiling with RelWithDebInfo. Release and Debug builds do not output this warning. It may be an issue in fmt.

writing between 2 and 9223372036854775807 bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]

[build]     inlined from 'virtual void spdlog::details::full_formatter::format(const spdlog::details::log_msg&, const tm&, spdlog::memory_buf_t&)' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/spdlog/pattern_formatter-inl.h:804:39:
[build] /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:437:30: warning: 'void* __builtin_memmove(void*, const void*, long unsigned int)' writing between 2 and 9223372036854775807 bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
[build]   437 |             __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
[build]       |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Full output:

[main] Building folder: jinker 
[build] Starting build
[proc] Executing command: /home/linuxbrew/.linuxbrew/bin/cmake --build /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2 --parallel 26 --target all
[build] [1/3] Building CXX object CMakeFiles/jinker.dir/src/jinker/aelog.cpp.o
[build] In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/string:51,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/locale_classes.h:40,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/ios_base.h:41,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/ios:44,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/istream:40,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/sstream:40,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/chrono:45,
[build]                  from /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/spdlog/common.h:10,
[build]                  from /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/spdlog/sinks/base_sink.h:12,
[build]                  from /home/jarrod/Dev/jinker/src/jinker/details/layered_sink.h:2,
[build]                  from /home/jarrod/Dev/jinker/src/jinker/aelog.h:3,
[build]                  from /home/jarrod/Dev/jinker/src/jinker/aelog.cpp:2:
[build] In static member function 'static constexpr _Up* std::__copy_move<_IsMove, true, std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp = char; _Up = char; bool _IsMove = false]',
[build]     inlined from 'constexpr _OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = char*; _OI = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:506:30,
[build]     inlined from 'constexpr _OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove = false; _II = char*; _OI = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:533:42,
[build]     inlined from 'constexpr _OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = char*; _OI = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:540:31,
[build]     inlined from 'constexpr _OI std::copy(_II, _II, _OI) [with _II = char*; _OI = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:633:7,
[build]     inlined from 'static _ForwardIterator std::__uninitialized_copy<true>::__uninit_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = char*; _ForwardIterator = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_uninitialized.h:147:27,
[build]     inlined from '_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = char*; _ForwardIterator = char*]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_uninitialized.h:185:15,
[build]     inlined from 'constexpr void fmt::v9::basic_memory_buffer<T, SIZE, Allocator>::grow(size_t) [with T = char; long unsigned int SIZE = 250; Allocator = std::allocator<char>]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/format.h:925:26,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::try_reserve(size_t) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:928:39,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::try_reserve(size_t) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:927:24,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::push_back(const T&) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:932:16,
[build]     inlined from 'virtual void spdlog::details::full_formatter::format(const spdlog::details::log_msg&, const tm&, spdlog::memory_buf_t&)' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/spdlog/pattern_formatter-inl.h:804:39:
[build] /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/stl_algobase.h:437:30: warning: 'void* __builtin_memmove(void*, const void*, long unsigned int)' writing between 2 and 9223372036854775807 bytes into a region of size 1 overflows the destination [-Wstringop-overflow=]
[build]   437 |             __builtin_memmove(__result, __first, sizeof(_Tp) * _Num);
[build]       |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[build] In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/x86_64-pc-linux-gnu/bits/c++allocator.h:33,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/allocator.h:46,
[build]                  from /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/string:43:
[build] In member function '_Tp* std::__new_allocator<_Tp>::allocate(size_type, const void*) [with _Tp = char]',
[build]     inlined from 'constexpr _Tp* std::allocator< <template-parameter-1-1> >::allocate(std::size_t) [with _Tp = char]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/allocator.h:198:40,
[build]     inlined from 'static constexpr _Tp* std::allocator_traits<std::allocator<_CharT> >::allocate(allocator_type&, size_type) [with _Tp = char]' at /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/alloc_traits.h:482:28,
[build]     inlined from 'constexpr void fmt::v9::basic_memory_buffer<T, SIZE, Allocator>::grow(size_t) [with T = char; long unsigned int SIZE = 250; Allocator = std::allocator<char>]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/format.h:923:49,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::try_reserve(size_t) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:928:39,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::try_reserve(size_t) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:927:24,
[build]     inlined from 'constexpr void fmt::v9::detail::buffer<T>::push_back(const T&) [with T = char]' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/fmt/core.h:932:16,
[build]     inlined from 'virtual void spdlog::details::full_formatter::format(const spdlog::details::log_msg&, const tm&, spdlog::memory_buf_t&)' at /home/jarrod/Dev/jinker/out/build/linux-relwithdeb-wsl2/vcpkg_installed/x64-linux/include/spdlog/pattern_formatter-inl.h:804:39:
[build] /home/linuxbrew/.linuxbrew/Cellar/gcc/13.2.0/include/c++/13/bits/new_allocator.h:147:55: note: destination object of size 1 allocated by 'operator new'
[build]   147 |         return static_cast<_Tp*>(_GLIBCXX_OPERATOR_NEW(__n * sizeof(_Tp)));
[build]       |                                                       ^
[build] [2/3] Linking CXX shared library libjinker.so
[build] [3/3] Linking CXX executable jinker-tests
[driver] Build completed: 00:00:07.014
[build] Build finished with exit code 0

[tt4g]

Duplicate fmtlib/fmt#3533 (fixed fmt v10.1.0)

And this is GCC bug.
See this comment: fmtlib/fmt#3533 (comment)