[Bug target/25630] New: darwin-ppc, wrong alignment of nested structs

[Bug target/25630] New: darwin-ppc, wrong alignment of nested structs

[andreast at gcc dot gnu dot org]

darwin-ppc gets the alignment of nested structs wrong if they contain long long
or double members.

The apple compiler, gcc version 4.0.1 (Apple Computer, Inc. build 5247)
does it 'correctly'.

Here an example for a wrong alignment:

struct A {long long a; unsigned char b;};
struct D {unsigned char y; struct A x; unsigned char z;};
struct E {long long d; unsigned char e;};

struct y { struct A b2; struct D b3; struct E b4;};

The apple output of sizeof(y) is 56, the current fsf gcc head gives: 64.

I put a few sample test cases into gcc.target/powerpc/darwin-abi-3...11.c on
main.


-- 
           Summary: darwin-ppc, wrong alignment of nested structs
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: andreast at gcc dot gnu dot org
 GCC build triplet: powerpc-apple-darwin8.3.0
  GCC host triplet: powerpc-apple-darwin8.3.0
GCC target triplet: powerpc-apple-darwin8.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25630

[Bug target/25630] darwin-ppc, wrong alignment of nested structs

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-01-01 20:36 -------
Confirmed.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |ABI, wrong-code, xfail
   Last reconfirmed|0000-00-00 00:00:00         |2006-01-01 20:36:16
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25630

[Bug target/25630] darwin-ppc, wrong alignment of nested structs

[geoffk at gcc dot gnu dot org]

------- Comment #2 from geoffk at gcc dot gnu dot org  2006-10-16 21:46 -------
I think this is a dup of bug 23067; they have the same underlying problem,
which is that FSF GCC doesn't emulate the Apple GCC algorithm for structure
layout exactly.

*** This bug has been marked as a duplicate of 23067 ***


-- 

geoffk at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25630