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C++17 makes constexpr static data members implicitly inline variables. In C++14, a subsequent out-of-class declaration is the definition. We want to continue emitting a symbol for such a declaration in C++17 mode, for ABI compatibility with C++14 code that wants to refer to it. Normally I'd distinguish in- and out-of-class declarations by looking at DECL_IN_AGGR_P, but we never set DECL_IN_AGGR_P on inline variables. I think that's wrong, but don't want to mess with it so close to release. Conveniently, we already have a test for in-class declaration earlier in the function. gcc/cp/ChangeLog: PR c++/99901 * decl.c (cp_finish_decl): mark_needed an implicitly inline static data member with an out-of-class redeclaration. gcc/testsuite/ChangeLog: PR c++/99901 * g++.dg/cpp1z/inline-var9.C: New test.
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