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These compare overloads throw when the pos index is out of range, not only when the const T& parameter throws on conversion to string_view. Remove the incorrect conditional noexcept-specifier from the two overloads that can throw. libstdc++-v3/ChangeLog: PR libstdc++/123991 * include/bits/basic_string.h (compare(size_type, size_type, T)): Remove noexcept-specifier. (compare(size_type, size_type, T, size_type, size_type)): Likewise. * include/bits/cow_string.h (compare(size_type, size_type, T)): Remove noexcept-specifier. (compare(size_type, size_type, T, size_type, size_type)): Likewise. * testsuite/21_strings/basic_string/operations/compare/char/123991.cc: New test. * testsuite/21_strings/basic_string/operations/compare/wchar_t/123991.cc: New test. Reviewed-by: Nathan Myers <nmyers@redhat.com>
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.