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The implicit constexpr patch revealed that our checks for constexpr constructors that could possibly produce a constant value (which otherwise are IFNDR) was failing to look at most of the function body. Fixing that required some library tweaks. gcc/cp/ChangeLog: * constexpr.c (maybe_save_constexpr_fundef): Also check whether the body of a constructor is potentially constant. libstdc++-v3/ChangeLog: * src/c++17/memory_resource.cc: Add missing constexpr. * include/experimental/internet: Only mark copy constructor as constexpr with __cpp_constexpr_dynamic_alloc. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/constexpr-89285-2.C: Expect error. * g++.dg/cpp1y/constexpr-89285.C: Adjust error.
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