* utils2.c (known_alignment): Derive the alignment from pointed-to

	types only if it is otherwise unknown.
	<INTEGER_CST>: Tidy.
	<MULT_EXPR>: Likewise.
	<POINTER_PLUS_EXPR>: If the alignment of the offset is unknown, use
	that of the base.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@137081 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 34 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/warn5.adb b/gcc/testsuite/gnat.dg/warn5.adb
new file mode 100644
index 00000000000..108bc594c0c
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/warn5.adb
@@ -0,0 +1,34 @@
+-- { dg-do compile }
+
+with System;
+with Unchecked_Conversion;
+
+procedure Warn5 is
+
+  type Digit_Type is range 0..15;
+
+  type Frequency_Type is array( 1..12) of Digit_Type;
+  pragma Pack(Frequency_Type);
+
+  type Element_Type is record
+     F : Frequency_Type;
+  end record;
+
+  type Array_Type is array (Natural range <>) of Element_Type;
+
+  type List_Type is record
+    A : Array_Type (0..1);
+  end record;
+  for List_Type'Alignment use 4;
+
+  type Pointer_Type is access Element_Type;
+  function To_Ptr is new Unchecked_Conversion(System.Address, Pointer_Type);
+
+  function Pointer (Pos : Natural; List : List_Type) return Pointer_Type is
+  begin
+    return To_Ptr(List.A(Pos)'Address); -- { dg-warning "source alignment" "" { target alpha*-*-* hppa*-*-* ia64-*-* mips*-*-* sparc*-*-* } }
+  end;
+
+begin
+  null;
+end;