re PR ada/35791 ([Ada] V-table messed up with interface composition)

gcc/testsuite/
	PR ada/35791
	* gnat.dg/check_displace_generation.adb: New.

From-SVN: r135677

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2008-05-20  Samuel Tardieu  <sam@rfc1149.net>
+
+	PR ada/35791
+	* gnat.dg/check_displace_generation.adb: New.
+
 2008-05-20  Samuel Tardieu  <sam@rfc1149.net>
 
 	PR ada/30740

gcc/testsuite/gnat.dg/check_displace_generation.adb

@@ -0,0 +1,50 @@
+-- { dg-do run }
+procedure Check_Displace_Generation is
+
+   package Stuff is
+
+      type Base_1 is interface;
+      function F_1 (X : Base_1) return Integer is abstract;
+
+      type Base_2 is interface;
+      function F_2 (X : Base_2) return Integer is abstract;
+
+      type Concrete is new Base_1 and Base_2 with null record;
+      function F_1 (X : Concrete) return Integer;
+      function F_2 (X : Concrete) return Integer;
+
+   end Stuff;
+
+   package body Stuff is
+
+      function F_1 (X : Concrete) return Integer is
+      begin
+         return 1;
+      end F_1;
+
+      function F_2 (X : Concrete) return Integer is
+      begin
+         return 2;
+      end F_2;
+
+   end Stuff;
+
+   use Stuff;
+
+   function Make_Concrete return Concrete is
+      C : Concrete;
+   begin
+      return C;
+   end Make_Concrete;
+
+   B_1 : Base_1'Class := Make_Concrete;
+   B_2 : Base_2'Class := Make_Concrete;
+
+begin
+   if B_1.F_1 /= 1 then
+      raise Program_Error with "bad B_1.F_1 call";
+   end if;
+   if B_2.F_2 /= 2 then
+      raise Program_Error with "bad B_2.F_2 call";
+   end if;
+end Check_Displace_Generation;