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The testsuite utilities that use random numbers use a default-constructed mersenne_twister_engine, meaning the values are reproducable. This adds support for seeding them, controlledby an environment variable. Defining GLIBCXX_SEED_TEST_RNG=val in the environment will cause the engines to be seeded with atoi(val) if that is non-zero, or with a value read from std::random_device otherwise. Running with different seeds revealed some bugs in the tests, where a randomly selected iterator was past-the-end (which can't be erased), or where the randomly populated container was empty, and then we tried to remove elements from it unconditionally. libstdc++-v3/ChangeLog: * testsuite/util/exception/safety.h (setup_base::generate): Support seeding random engine. (erase_point, erase_range): Adjust range of random numbers to ensure dereferenceable iterators are used where required. (generation_prohibited::run): Do not try to erase from empty containers. * testsuite/util/testsuite_containergen.h (test_containers): Support seeding random engine.
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