From: Eric Botcazou <ebotca...@adacore.com>
The pragma is consistenly rejected for the alignment of array types because
Eval_Attribute does not evaluate it even if it is known.
gcc/ada/
* sem_attr.adb (Eval_Attribute): Treat Alignment like Component_Size
for array types.
Tested on x86_64-pc-linux-gnu, committed on master.
---
gcc/ada/sem_attr.adb | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb
index e80a144ebb2..65442d45a85 100644
--- a/gcc/ada/sem_attr.adb
+++ b/gcc/ada/sem_attr.adb
@@ -8729,14 +8729,15 @@ package body Sem_Attr is
-- Unconstrained_Array are again exceptions, because they apply as well
-- to unconstrained types.
+ -- Folding can also be done for Preelaborable_Initialization based on
+ -- whether the prefix type has preelaborable initialization, even though
+ -- the attribute is nonstatic.
+
-- In addition Component_Size is an exception since it is possibly
-- foldable, even though it is never static, and it does apply to
-- unconstrained arrays. Furthermore, it is essential to fold this
-- in the packed case, since otherwise the value will be incorrect.
-
- -- Folding can also be done for Preelaborable_Initialization based on
- -- whether the prefix type has preelaborable initialization, even though
- -- the attribute is nonstatic.
+ -- Moreover, the exact same reasoning can be applied to Alignment.
elsif Id = Attribute_Atomic_Always_Lock_Free or else
Id = Attribute_Definite or else
@@ -8747,7 +8748,8 @@ package body Sem_Attr is
Id = Attribute_Preelaborable_Initialization or else
Id = Attribute_Type_Class or else
Id = Attribute_Unconstrained_Array or else
- Id = Attribute_Component_Size
+ Id = Attribute_Component_Size or else
+ Id = Attribute_Alignment
then
Static := False;
Set_Is_Static_Expression (N, False);
--
2.43.2
