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PR libstdc++/94498 * include/bits/char_traits.h (__gnu_cxx::char_traits::move): Make it usable in constant expressions for C++20. (__gnu_cxx::char_traits::copy, __gnu_cxx::char_traits::assign): Add _GLIBCXX20_CONSTEXPR. (std::char_traits<char>, std::char_traits<wchar_t>) (std::char_traits<char8_t>): Make move, copy and assign usable in constant expressions for C++20. (std::char_traits<char16_t>, std::char_traits<char32_t>): Make move and copy usable in constant expressions for C++20. * include/std/string_view (basic_string_view::copy): Add _GLIBCXX20_CONSTEXPR. * testsuite/21_strings/basic_string_view/operations/copy/char/ constexpr.cc: New test. * testsuite/21_strings/basic_string_view/operations/copy/wchar_t/ constexpr.cc: New test.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.