On Mon, Jan 17, 2022 at 02:59:15PM -0000, Artur Frenszek-Iwicki wrote:
> I tried compiling colobot with the new gcc, expecting it to break in some
> new and fascinating way, and got the following error:
>
> In function 'std::char_traits<char>::copy(char*, char const*, unsigned long)',
> inlined from 'std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_S_copy(char*, char const*, unsigned long)' at
> /usr/include/c++/12/bits/basic_string.h:423:21,
> inlined from 'std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_S_copy(char*, char const*, unsigned long)' at
> /usr/include/c++/12/bits/basic_string.h:418:7,
> inlined from 'std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::_M_replace(unsigned long, unsigned long, char const*,
> unsigned long)' at /usr/include/c++/12/bits/basic_string.tcc:532:22,
> inlined from 'std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::assign(char const*)' at
> /usr/include/c++/12/bits/basic_string.h:1645:19,
> inlined from 'std::__cxx11::basic_string<char, std::char_traits<char>,
> std::allocator<char> >::operator=(char const*)' at
> /usr/include/c++/12/bits/basic_string.h:813:28,
> inlined from 'Ui::CList::SetItemName(int,
> std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>
> > const&)' at
> /builddir/build/BUILD/colobot-colobot-gold-0.2.0-alpha/src/ui/controls/list.cpp:664:28:
> /usr/include/c++/12/bits/char_traits.h:431:56: error: 'memcpy' accessing
> 9223372036854775810 or more bytes at offsets -4611686018427387902 and
> [-4611686018427387903, 4611686018427387904] may overlap up to
> 9223372036854775813 bytes at offset -3 [-Werror=restrict]
> 431 | return static_cast<char_type*>(__builtin_memcpy(__s1, __s2,
> __n));
> |
> ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
>
> The relevant bit of code is this line:
> m_items[i].text = " ";
> Where the ".text" struct member is an std::string.
>
> Any suggestions on how to fix this will be appreciated.
Please send me preprocessed source + g++ command line, provided the warning
is reproduceable without -flto.
Jakub
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