[Bug libc/18231] New: ipc_perm struct's mode member has wrong type in sys/ipc.h

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18231

            Bug ID: 18231
           Summary: ipc_perm struct's mode member has wrong type in
                    sys/ipc.h
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
                CC: drepper.fsp at gmail dot com

the ipc_perm mode member must have type mode_t, this works on some targets (eg
aarch64, linux) but broken on others (eg x86_64, linux)

http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_ipc.h.html

the following code fails on x86_64 linux:

#define _XOPEN_SOURCE 700
#include <sys/ipc.h>
void f()
{
struct ipc_perm x;
mode_t *p = &x.mode; // warning: initialization from incompatible pointer type
[enabled by default]
}

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