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* cp-tree.def (TINST_LEVEL): Document TINST_IN_SYSTEM_HEADER_P. * cp-tree.h (struct tinst_level): Add in_system_header_p. (TINST_IN_SYSTEM_HEADER_P): New macro. (make_tinst_level): Remove. * pt.c (lookup_template_class): Preserve DECL_IN_SYSTEM_HEADER on the instantiated class. (push_tinst_level): Do not use make_tinst_level. Set TINST_IN_SYSTEM_HEADER_P. (pop_tinst_level): Likewise. (instantiate_class_template): Set in_system_header. (instantiate_pending_templates): Likewise. * tree.c (make_tinst_level): Remove. PR c++/20145 * g++.dg/warn/Wdtor1.C: New test. From-SVN: r97854
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