The compiler may crash processing a private tagged record type has
some component whose type is a subtype of a private type. After
this patch the following test compiles without errors.
package Other_Type is
package BS is
type Bounded_String is private;
private
type Super_String (Max_Length : Positive) is record
null;
end record;
type Bounded_String is new Super_String (10);
end;
type S is new BS.Bounded_String;
end;
with Other_Type;
package Pkg is
type Key_Type is private;
private
type Key_Type is new Other_Type.S;
end;
package Pkg.Gen_Instance is
type T is tagged null record;
private
subtype A_T is Key_Type;
type Derived is new T with record -- Test
X : A_T;
end record;
end;
Command: gcc -c pkg-gen_instance.ads
Tested on x86_64-pc-linux-gnu, committed on trunk
2017-04-25 Javier Miranda <[email protected]>
* exp_ch3.adb (Build_Initialization_Call): Handle
subtypes of private types when searching for the underlying full
view of a private type.
Index: exp_ch3.adb
===================================================================
--- exp_ch3.adb (revision 247143)
+++ exp_ch3.adb (working copy)
@@ -1451,6 +1451,12 @@
elsif Is_Generic_Actual_Type (Full_Type) then
Full_Type := Base_Type (Full_Type);
+ elsif Ekind (Full_Type) = E_Private_Subtype
+ and then (not Has_Discriminants (Full_Type)
+ or else No (Discriminant_Constraint (Full_Type)))
+ then
+ Full_Type := Etype (Full_Type);
+
-- The loop has recovered the [underlying] full view, stop the
-- traversal.
