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From: "darpeer at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/66060] New: struct member allocation off.
Date: Thu, 07 May 2015 21:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66060

            Bug ID: 66060
           Summary: struct member allocation off.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: darpeer at hotmail dot com
  Target Milestone: ---

Using gdb, two struct members end up at the same offset.

gcc (GCC) 6.0.0 20150418 (experimental) and older.

gcc -c -O0 -ggdb3 struct-example.C

cat struct-example.C
struct ODD_S {
    char a[/*0x2000 */   2097152];
    char b[/*0x400 */  536870912];
    char c[/*0x8000 */  33554432];
} l_;

(gdb) p &l_.a
$1 = (char (*)[2097152]) 0x0 <l_>
(gdb) p &l_.b
$2 = (char (*)[536870912]) 0x200000 <l_+2097152>
(gdb) p &l_.c
$3 = (char (*)[33554432]) 0x200000 <l_+2097152>