The compiler may crash processing the successor or predecessor of a task
type discrete discriminant.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* sem_attr.adb (Resolve_Attribute): Ensure that attribute
expressions are resolved at this stage; required for preanalyzed
references to discriminants since their resolution (and
expansion) will take care of updating their Entity attribute to
reference their discriminal.diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb
--- a/gcc/ada/sem_attr.adb
+++ b/gcc/ada/sem_attr.adb
@@ -12500,6 +12500,28 @@ package body Sem_Attr is
when others => null;
end case;
+ -- Ensure that attribute expressions are resolved at this stage;
+ -- required for preanalyzed references to discriminants since
+ -- their resolution (and expansion) will take care of updating
+ -- their Entity attribute to reference their discriminal.
+
+ if Expander_Active
+ and then Present (Expressions (N))
+ then
+ declare
+ Expr : Node_Id := First (Expressions (N));
+
+ begin
+ while Present (Expr) loop
+ if not Analyzed (Expr) then
+ Resolve (Expr, Etype (Expr));
+ end if;
+
+ Next (Expr);
+ end loop;
+ end;
+ end if;
+
-- If the prefix of the attribute is a class-wide type then it
-- will be expanded into a dispatching call to a predefined
-- primitive. Therefore we must check for potential violation
