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template friends need to be recognized by module streaming and associated with the befriending class. but their context is that of the friend (a namespace or other class). This adds a flag to mark such templates, and uses their DECL_CHAIN to point at the befriender. gcc/cp * cp-tree.h (DECL_UNINSTANTIATED_TEMPLATE_FRIEND): New. * pt.c (push_template_decl): Set it. (tsubst_friend_function): Clear it.
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