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r13-3299 changed our internal declaration of __dynamic_cast to reside inside the abi/__cxxabiv1:: namespace instead of the global namespace, matching the real declaration. This inadvertently made us now attempt constexpr evaluation of user-written calls to abi::__dynamic_cast since cxx_dynamic_cast_fn_p now also returns true for them, but we're not prepared to handle arbitrary calls to __dynamic_cast, and therefore ICE. This patch restores cxx_dynamic_cast_fn_p to return true only for synthesized calls to __dynamic_cast, which can be distinguished by DECL_ARTIFICIAL, since apparently the synthesized declaration of __dynamic_cast doesn't get merged with the actual declaration. PR c++/120620 gcc/cp/ChangeLog: * constexpr.cc (cxx_dynamic_cast_fn_p): Return true only for synthesized __dynamic_cast. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/constexpr-dynamic19.C: New test. * g++.dg/cpp2a/constexpr-dynamic1a.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com>
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