[Bug target/28902] New: Fix for "alingment of XXX is greater than maximum object alignment" on AVR

[ramagnus at t-online dot de]

The avr target gives that alignment warning for every polymorphic class,
because it doesn't define TARGET_VTABLE_ENTRY_ALIGN, which means the default
kicks in, which is the size of a pointer. Since the AVR as an 8 bit platform
has no alignment requirements, BIGGEST_ALIGNMENT is 8, which is less than the
pointer size. The fix is trivial. A patch against trunk follows:

Index: gcc/config/avr/avr.h
===================================================================
--- gcc/config/avr/avr.h        (revision 116509)
+++ gcc/config/avr/avr.h        (working copy)
@@ -94,6 +94,7 @@
 /* No data type wants to be aligned rounder than this.  */
 #define BIGGEST_ALIGNMENT 8

+#define TARGET_VTABLE_ENTRY_ALIGN 8

 #define STRICT_ALIGNMENT 0


-- 
           Summary: Fix for "alingment of XXX is greater than maximum object
                    alignment" on AVR
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: trivial
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ramagnus at t-online dot de
 GCC build triplet: *-*-*
  GCC host triplet: *-*-*
GCC target triplet: avr-unknown-none


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28902