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A simple empty class copy is still simple when wrapped in a TARGET_EXPR, so we need to strip that as well. This change also exposed some unnecessary copies in return statements, which when returning by invisible reference led to <RETURN_EXPR <MEM_REF <RESULT_DECL>>>, which gimplify_return_expr didn't like. So we also need to strip the _REF when we eliminate the INIT_EXPR. gcc/cp/ChangeLog 2020-03-19 Jason Merrill <jason@redhat.com> PR c++/94175 * cp-gimplify.c (simple_empty_class_p): Look through SIMPLE_TARGET_EXPR_P. (cp_gimplify_expr) [MODIFY_EXPR]: Likewise. [RETURN_EXPR]: Avoid producing 'return *retval;'. * call.c (build_call_a): Strip TARGET_EXPR from empty class arg. * cp-tree.h (SIMPLE_TARGET_EXPR_P): Check that TARGET_EXPR_INITIAL is non-null.
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