This patch fixes an infinite loop in the compiler when warnings on redundant constructs are enabled (-gnatwr) and the constructs are use_type clauses that appear (redundantly) in a parent unit and a child unit. The following command: gcc -c -gnatwr root-child.ads must yield: root-child.ads:2:01: warning: "Pack.Typ" is already use-visible through previous use_type_clause at root.ads:2 The following must compile quietly: gcc -c -gnatwr root-child-grand.ads ---- package Pack is type Typ is new Integer; end Pack; ---- with Pack; use type Pack.Typ; package Root is Thing1 : Pack.Typ; end Root; ---- with pack; use type pack.typ; package Root.Child is Thing2 : Pack.Typ := Root.Thing1 * 3; end; ---- with Pack; use type Pack.Typ; package Root.Child.Grand is Thing3 : Pack.Typ := Thing1 + Thing2; end; 2018-05-24 Ed Schonberg <schonberg@adacore.com> gcc/ada/ * sem_ch8.adb (Analyze_Use_Type): Do not assign the Prev_Use_Clause link to a use_type clause if this would cause an infinite loop in the machinery that detects redundant use clauses. This may happen when the redundant clauses appear in the context of a child unit and the context of its parent. From-SVN: r260663
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