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GCC defaults to -std=gnu++17 now anyway, and using it explicitly in the dg-options directive prevents running these tests with different modes such as -std=c++17 or -std=gnu++20. libstdc++-v3/ChangeLog: * testsuite/20_util/memory_resource/1.cc: Remove -std=gnu++17 from dg-options directive. * testsuite/20_util/memory_resource/2.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/1.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/93208.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/allocate.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/deallocate.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/release.cc: Likewise. * testsuite/20_util/monotonic_buffer_resource/upstream_resource.cc: Likewise. * testsuite/20_util/polymorphic_allocator/1.cc: Likewise. * testsuite/20_util/polymorphic_allocator/construct_pair.cc: Likewise. * testsuite/20_util/polymorphic_allocator/resource.cc: Likewise. * testsuite/20_util/polymorphic_allocator/select.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/allocate.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/allocate_single.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/cons.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/cons_single.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/is_equal.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/multithreaded.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/options.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/release.cc: Likewise. * testsuite/20_util/synchronized_pool_resource/release_single.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/allocate-max-chunks.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/allocate.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/cons.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/is_equal.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/options.cc: Likewise. * testsuite/20_util/unsynchronized_pool_resource/release.cc: Likewise. * testsuite/21_strings/basic_string/types/pmr_typedefs.cc: Likewise. * testsuite/23_containers/deque/types/pmr_typedefs.cc: Likewise. * testsuite/23_containers/deque/types/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/forward_list/pmr_typedefs.cc: Likewise. * testsuite/23_containers/forward_list/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/list/pmr_typedefs.cc: Likewise. * testsuite/23_containers/list/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/map/pmr_typedefs.cc: Likewise. * testsuite/23_containers/map/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/multimap/pmr_typedefs.cc: Likewise. * testsuite/23_containers/multimap/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/multiset/pmr_typedefs.cc: Likewise. * testsuite/23_containers/multiset/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/set/pmr_typedefs.cc: Likewise. * testsuite/23_containers/set/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/unordered_map/pmr_typedefs.cc: Likewise. * testsuite/23_containers/unordered_map/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/unordered_multimap/pmr_typedefs.cc: Likewise. * testsuite/23_containers/unordered_multimap/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/unordered_multiset/pmr_typedefs.cc: Likewise. * testsuite/23_containers/unordered_multiset/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/unordered_set/pmr_typedefs.cc: Likewise. * testsuite/23_containers/unordered_set/pmr_typedefs_debug.cc: Likewise. * testsuite/23_containers/vector/pmr_typedefs.cc: Likewise. * testsuite/23_containers/vector/types/pmr_typedefs_debug.cc: Likewise. * testsuite/28_regex/match_results/pmr_typedefs.cc: Likewise.