From: Steve Baird <ba...@adacore.com>
In deciding whether a Size attribute reference is static, the compiler could
get confused about whether an implicitly-declared subtype of a generic formal
type is itself a generic formal type, possibly resulting in an assertion
failure and then a bugbox.
gcc/ada/
* sem_attr.adb (Eval_Attribute): Expand existing checks for
generic formal types for which Is_Generic_Type returns False. In
that case, mark the attribute reference as nonstatic.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/sem_attr.adb | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb
index 65442d45a85..2fa7d7d25d2 100644
--- a/gcc/ada/sem_attr.adb
+++ b/gcc/ada/sem_attr.adb
@@ -8685,10 +8685,20 @@ package body Sem_Attr is
-- If the root type or base type is generic, then we cannot fold. This
-- test is needed because subtypes of generic types are not always
-- marked as being generic themselves (which seems odd???)
+ --
+ -- Should this situation be addressed instead by either
+ -- a) setting Is_Generic_Type in more cases
+ -- or b) replacing preceding calls to Is_Generic_Type with calls to
+ -- Sem_Util.Some_New_Function
+ -- so that we wouldn't have to deal with these cases here ???
if Is_Generic_Type (P_Root_Type)
or else Is_Generic_Type (P_Base_Type)
+ or else (Present (Associated_Node_For_Itype (P_Base_Type))
+ and then Is_Generic_Type (Defining_Identifier
+ (Associated_Node_For_Itype (P_Base_Type))))
then
+ Set_Is_Static_Expression (N, False);
return;
end if;
--
2.43.2
