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Instead of a single test that only checks whether <regex> can be included in Parallel Mode, add tests for each of C++11/C++14/C++17 that check whether <bits/extc++.h> is compatible with _GLIBCXX_PARALLEL. This increases the coverage to (almost) all headers. If <omp.h> is not available then the tests will trivially pass, because we don't care about compatibility with _GLIBCXX_PARALLEL in that case. PR libstdc++/89023 * testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test. * testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test. * testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test. * testsuite/28_regex/headers/regex/parallel_mode.cc: Remove. From-SVN: r268769
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.