[Bug c/36004] New: gcc bug on alpha

[Bug c/36004] New: gcc bug on alpha

[oliver at linux-kernel dot at]

Testcase:
#include <stdlib.h>
#include <stdio.h>

struct Tst { unsigned char data[1]; };

int main(void)
{
        struct Tst *tst = malloc(sizeof(struct Tst) + 10);
        unsigned char *tmp = tst->data;

        tst->data[0] = 0;
        tmp[0] = 1;
        tmp[1] = 2;

        printf("%x %x\n", tmp[0], tmp[1]);
        printf("%x %x\n", tst->data[0], tst->data[1]);
        printf("%p %p\n", &tmp[0], &tmp[1]);
        printf("%p %p\n", &tst->data[0], &tst->data[1]);
        return 0;
}


Produces on x86_64 (Dell PC, Core 2 Duo)
1 2
1 2
0x601010 0x601011
0x601010 0x601011

Produces on alpha (DS10, EV67, Fedora 8)
1 2
1 1
0x120012010 0x120012011
0x120012010 0x120012011

Produces on ia64 (SLES 10.1)
1 2
1 2
0x6000000000004010 0x6000000000004011
0x6000000000004010 0x6000000000004011

If you need access to an alpha, I can arrange this!

Sorry, if the component is wrong.


-- 
           Summary: gcc bug on alpha
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: oliver at linux-kernel dot at
 GCC build triplet: alpha-redhat-linux
  GCC host triplet: alpha-redhat-linux
GCC target triplet: alpha-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004

[Bug target/36004] gcc bug on alpha

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|critical                    |normal
          Component|c                           |target


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004

[Bug target/36004] alpha doesn't see stores, through other variables, for "struct hack"

[falk at debian dot org]

------- Comment #1 from falk at debian dot org  2008-05-02 13:55 -------
I can reproduce this with 4.1, but not with 4.2.3 or 4.3.1 20080401. So it
seems to be fixed.


-- 

falk at debian dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004

[Bug target/36004] alpha doesn't see stores, through other variables, for "struct hack"

[oliver at linux-kernel dot at]

------- Comment #2 from oliver at linux-kernel dot at  2008-05-13 10:49 -------
Finally I have a working gcc 4.3.0, although I had to disable gnat compilation,
as there's some error. With gcc 4.3.0 ustr compiles, so this really is fixed.

Regarding gnat; Can we use this ticket for tracking the problem?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004

[Bug target/36004] alpha doesn't see stores, through other variables, for "struct hack"

[falk at debian dot org]

------- Comment #3 from falk at debian dot org  2008-05-14 11:08 -------
(In reply to comment #2)
> Regarding gnat; Can we use this ticket for tracking the problem?

No, please file a new bug. Or is this the same as PR 36025?


-- 

falk at debian dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |falk at debian dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004

[Bug target/36004] alpha doesn't see stores, through other variables, for "struct hack"

[oliver at linux-kernel dot at]

------- Comment #4 from oliver at linux-kernel dot at  2008-05-14 19:41 -------
(In reply to comment #3)
> (In reply to comment #2)
> > Regarding gnat; Can we use this ticket for tracking the problem?
> 
> No, please file a new bug. Or is this the same as PR 36025?

Oh yes. Sorry, forgot, that I already opened a bz for this.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36004