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This will hardly make a dent in the very slow compile times for <regex> but it seems worth doing anyway. libstdc++-v3/ChangeLog: * include/bits/regex_compiler.h: Replace _GLIBCXX17_CONSTEXPR with constexpr and disable diagnostics with pragmas. (_AnyMatcher::operator()): Use constexpr-if instead of tag dispatching. Postpone calls to _M_translate until after checking result of earlier calls. (_AnyMatcher::_M_apply): Remove both overloads. (_BracketMatcher::operator(), _BracketMatcher::_M_ready): Replace tag dispatching with 'if constexpr'. (_BracketMatcher::_M_apply(_CharT, true_type)): Remove. (_BracketMatcher::_M_apply(_CharT, false_type)): Remove second parameter. (_BracketMatcher::_M_make_cache): Remove both overloads. * include/bits/regex_compiler.tcc (_BracketMatcher::_M_apply): Remove second parameter. * include/bits/regex_executor.tcc: Replace _GLIBCXX17_CONSTEXPR with constexpr and disable diagnostics with pragmas. (_Executor::_M_handle_backref): Replace __glibcxx_assert with static_assert. (_Executor::_M_handle_accept): Mark _S_opcode_backref case as unreachable for non-DFS mode and do not instantiate _M_handle_backref for that case. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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