PR libstdc++/71856 * doc/xml/manual/using.xml: Document macro. * include/bits/c++config [_GLIBCXX_DEBUG || _GLIBCXX_PARALLEL] (__glibcxx_assert): Rename to __glibcxx_assert_impl. [_GLIBCXX_DEBUG] (__glibcxx_assert): Expand to __glibcxx_assert_impl. * include/parallel/base.h [_GLIBCXX_PARALLEL_ASSERTIONS] (_GLIBCXX_PARALLEL_ASSERT): Expand to __glibcxx_assert_impl. [!_GLIBCXX_PARALLEL_ASSERTIONS] (_GLIBCXX_PARALLEL_ASSERT): Define as empty. * testsuite/25_algorithms/headers/algorithm/ parallel_algorithm_assert2.cc: New test. From-SVN: r243434
