[multiple changes]

2017-05-02  Bob Duff  <duff@adacore.com>

	* s-taprop-linux.adb (Prio_To_Linux_Prio): New function to correctly
	compute the linux priority from the Ada priority. Call this everywhere
	required. In particular, the previous version was not doing this
	computation when setting the ceiling priority in various places. It
	was just converting to C.int, which results in a ceiling that is off
	by 1.

2017-05-02  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb: Comment predicate inheritance.

From-SVN: r247473

gcc/ada/ChangeLog

+2017-05-02  Bob Duff  <duff@adacore.com>
+
+	* s-taprop-linux.adb (Prio_To_Linux_Prio): New function to correctly
+	compute the linux priority from the Ada priority. Call this everywhere
+	required. In particular, the previous version was not doing this
+	computation when setting the ceiling priority in various places. It
+	was just converting to C.int, which results in a ceiling that is off
+	by 1.
+
+2017-05-02  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch3.adb: Comment predicate inheritance.
+
 2017-05-02  Tristan Gingold  <gingold@adacore.com>
 
 	* s-trasym.ads: Add comment.

gcc/ada/sem_ch3.adb

@@ -3133,7 +3133,11 @@ package body Sem_Ch3 is
 
             when N_Derived_Type_Definition =>
                Derived_Type_Declaration (T, N, T /= Def_Id);
-               if Ekind (T) /= E_Void and then Has_Predicates (T) then -- ????
+
+               --  Inherit predicates from parent, and protect against
+               --  illegal derivations.
+
+               if Is_Type (T) and then Has_Predicates (T) then
                   Set_Has_Predicates (Def_Id);
                end if;