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The testcase was failing to compile on some targets due to its use of the non-standard functions nextupl and nextdownl. This patch makes the testcase instead use the C99 function nexttowardl in an equivalent way. libstdc++-v3/ChangeLog: PR libstdc++/98384 * testsuite/20_util/to_chars/long_double.cc: Use nexttowardl instead of the non-standard nextupl and nextdownl.
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.