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Some more C++20 changes from P1614R2, "The Mothership has Landed". This includes the proposed resolution for LWG 3426 to fix the three-way comparison with nullptr_t. The existing tests for unique_ptr comparisons don't actually check the results, only that the expressions compile and are convertible to bool. This also adds a test for the results of those comparisons for C++11 and up. * include/bits/unique_ptr.h (operator<=>): Define for C++20. * testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line. * testsuite/20_util/default_delete/void_neg.cc: Likewise. * testsuite/20_util/unique_ptr/comparison/compare.cc: New test. * testsuite/20_util/unique_ptr/comparison/compare_c++20.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.