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The problem in the PR was that make_temporary_var_for_ref_to_temp ran before determine_visibility, so when we copied the linkage of the reference variable it had not yet been restricted by its anonymous namespace context, so the temporary wrongly ended up with TREE_PUBLIC set. The natural solution is to run determine_visibility earlier. But that needs to happen after maybe_commonize_var increases the linkage of some local variables, and on targets without weak symbol support, that function does different things based on the results of check_initializer, which is what calls make_temporary_var_for_ref_to_temp. To break this circular dependency I'm calling maybe_commonize_var early, and then again later if the target doesn't support weak symbols. It also occurred to me that make_temporary_var_for_ref_to_temp wasn't handling DECL_VISIBILITY at all, and verified that we were doing the wrong thing. So I've combined the linkage-copying code from there and two other places. * decl2.c (copy_linkage): Factor out of get_guard. * call.c (make_temporary_var_for_ref_to_temp): Use it. * decl.c (cp_finish_decomp): Use it. (cp_finish_decl): determine_visibility sooner.
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