@@ -3837,6 +3837,7 @@ package body Exp_Aggr is
Comp := First (Component_Associations (N));
while Present (Comp) loop
Selector := Entity (First (Choices (Comp)));
+ pragma Assert (Present (Selector));
-- C++ constructors
@@ -6235,6 +6235,19 @@ package body Sem_Util is
-- Examine parent type
if Etype (Typ) /= Typ then
+ -- Prevent infinite recursion, which can happen in illegal
+ -- programs. Silently return if illegal. For now, just deal
+ -- with the 2-type cycle case. Larger cycles will get
+ -- SIGSEGV at compile time from running out of stack.
+
+ if Etype (Etype (Typ)) = Typ then
+ if Total_Errors_Detected = 0 then
+ raise Program_Error;
+ else
+ return;
+ end if;
+ end if;
+
Process_Type (Etype (Typ));
end if;
From: Bob Duff <duff@adacore.com> In (illegal) mutually-dependent type declarations, it is possible for Etype (Etype (Typ)) to point back to Typ. This patch stops the recursion in such cases. gcc/ada/ * sem_util.adb (Process_Type): Stop the recursion. * exp_aggr.adb (Build_Record_Aggr_Code): Add assertion. Tested on x86_64-pc-linux-gnu, committed on master. --- gcc/ada/exp_aggr.adb | 1 + gcc/ada/sem_util.adb | 13 +++++++++++++ 2 files changed, 14 insertions(+)