[Bug target/23071] New: Darwin alignment ignores "attribute packed" for first 'double' element of a struct

["sabre at nondot dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Darwin ignores the alignment/packed attributes on this structure, forcing the
structure to have 8-byte alignment and 16-byte size:

---
struct Test {
  double D __attribute__((packed,aligned(4)));
  short X;
};
---

Ian Lance Taylor did a great analysis of the history of this, tracking it back
to a patch by David Edelsohn in 1996.  The analysis is here:
http://gcc.gnu.org/ml/gcc-help/2005-07/msg00280.html

-Chris

-- 
           Summary: Darwin alignment ignores "attribute packed" for first
                    'double' element of a struct
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: dje at watson dot ibm dot com
        ReportedBy: sabre at nondot dot org
                CC: gcc-bugs at gcc dot gnu dot org,ian at airs dot com
  GCC host triplet: powerpc-darwin-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23071