[Bug c/42098] gcc does not honor alignment specification for qualified typedefs

[Bug c/42098] gcc does not honor alignment specification for qualified typedefs

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42098

Richard Guenther <rguenth at gcc dot gnu.org> changed:

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

--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-03-28 12:02:40 UTC ---
dup.

*** This bug has been marked as a duplicate of bug 12742 ***

[Bug c/42098] New: gcc does not honor alignment specification, gives different alignment than g++

[jepler at unpythonic dot net]

Given the declaration: typedef volatile double D __attribute__((aligned(16)));
gcc and g++ give different alignments (and thus differing offsets and sizes)
for structures that contain D.  Removal of the volatile qualifier changes the
alignment behavior.

$ g++ -m32 vs.c && ./a.out
$ gcc -m32 -Dvolatile= vs.c && ./a.out
$ gcc -m32 vs.c && ./a.out
a.out: vs.c:8: main: Assertion `__alignof__(S) == 8' failed.
Aborted

$ gcc -v 2>&1 | tail -1
gcc version 4.2.4 (Ubuntu 4.2.4-1ubuntu4)


-- 
           Summary: gcc does not honor alignment specification, gives
                    different alignment than g++
           Product: gcc
           Version: 4.2.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jepler at unpythonic dot net
 GCC build triplet: x86_64-linux-gnu
  GCC host triplet: x86_64-linux-gnu
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42098

[Bug c/42098] gcc does not honor alignment specification for qualified typedefs

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2009-11-25 21:23 -------
Confirmed, it is a problem with qualifiers.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
          Component|target                      |c
     Ever Confirmed|0                           |1
 GCC target triplet|i?86-*-*                    |
   Last reconfirmed|0000-00-00 00:00:00         |2009-11-25 21:23:45
               date|                            |
            Summary|gcc does not honor alignment|gcc does not honor alignment
                   |specification for typedefs  |specification for qualified
                   |                            |typedefs


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42098