42f9b481be
r8-1253-g3d2e25a240c711 removed the template argument linkage requirement in convert_nontype_argument for C++17 (which r9-3836-g4be5c72cf3ea3e later factored out into invalid_tparm_referent_p), but we need to also remove the one in convert_nontype_argument_function for benefit of the first and third testcase which we currently reject even in C++17/20 mode. And in invalid_tparm_referent_p we're inadvertendly returning false for the address of a lambda's static op() since it's DECL_ARTIFICIAL, which currently causes us to reject the second (C++20) testcase. But this DECL_ARTIFICIAL check seems to be relevant only for VAR_DECL, and in fact this code path was originally reachable only for VAR_DECL until recently (r13-6970-gb5e38b1c166357). So this patch restricts the check to VAR_DECL. Co-authored-by: Jonathan Wakely <jwakely@redhat.com> PR c++/83258 PR c++/80488 PR c++/97700 gcc/cp/ChangeLog: * pt.cc (convert_nontype_argument_function): Remove linkage requirement for C++17 and later. (invalid_tparm_referent_p) <case ADDR_EXPR>: Restrict DECL_ARTIFICIAL rejection test to VAR_DECL. gcc/testsuite/ChangeLog: * g++.dg/ext/visibility/anon8.C: Don't expect a "no linkage" error for the template argument &B2:fn in C++17 mode. * g++.dg/cpp0x/lambda/lambda-conv15.C: New test. * g++.dg/cpp2a/nontype-class56.C: New test. * g++.dg/template/function2.C: New test. (cherry picked from commit c3afdb8ba8f1839544c414f57e41a58c8fda5349)
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