gcc/testsuite/gnat.dg/specs/size_clause3.ads

   1 -- { dg-do compile }
   2
   3 package Size_Clause3 is
   4
   5   -- The record inherits the alignment of Integer, which is 4, so
   6   -- the real size is 64 instead of 40.
   7   type R1 is record
   8     I : Integer;
   9     B : aliased Boolean;
  10   end record;
  11
  12   -- That's not OK, the size of a component of type R1 cannot be 40.
  13   type S1 is record
  14     rr : R1; -- size must be 40
  15   end record;
  16   for S1 use record
  17     rr at 0 range 0 .. 39;  -- { dg-error "size of .rr. with aliased or tagged" }
  18   end record;
  19
  20   -- The record is explicitly given alignment 1 so its real type is 40.
  21   type R2 is record
  22     I : Integer;
  23     B : aliased Boolean;
  24   end record;
  25   for R2'Alignment use 1;
  26
  27   -- That's OK, the size of a component of type R2 can be 40.
  28   type S2 is record
  29     rr : R2; -- size must be 40
  30   end record;
  31   for S2 use record
  32     rr at 0 range 0 .. 39;
  33   end record;
  34
  35   -- The record is explicitly given alignment 4 so its real type is 64.
  36   type R3 is record
  37     I : Integer;
  38     B : aliased Boolean;
  39   end record;
  40   for R3'Alignment use 4;
  41
  42   -- That's not OK, the size of a component of type R3 cannot be 40.
  43   type S3 is record
  44     rr : R3; -- size must be 40
  45   end record;
  46   for S3 use record
  47     rr at 0 range 0 .. 39;  -- { dg-error "size of .rr. with aliased or tagged" }
  48   end record;
  49
  50 end Size_Clause3;