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When we extract wide characters and insert them into a stringstream to be parsed as a floating-point value, we should use a stringstream of char, not wchar_t. libstdc++-v3/ChangeLog: PR libstdc++/123147 * include/bits/chrono_io.h (_Parser::operator()) <%S>: Use a buffer of narrow characters to be parsed by std::from_chars. * testsuite/std/time/parse/parse.cc: Check wchar_t parsing.
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.