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
