Use single bits/msq.h for all architectures.

The bits/msq.h headers for architectures using the Linux kernel vary
in a few ways:

* x32 uses __syscall_ulong_t instead of unsigned long int.

* x32 has 64-bit time_t, so no padding around time fields despite
  __WORDSIZE == 32.

* Some older 32-bit big-endian architectures have padding before
  rather than after time fields, although the preferred generic
  approach is padding after the time fields independent of endianness.

(There are also insubstantial differences such as use of unsigned int
for padding instead of unsigned long int, which makes no difference to
layout since the padding fields using unsigned int are only present on
32-bit architectures.)

For the first, __syscall_ulong_t can be used in the generic version as
it's the same as unsigned long int everywhere except x32.  For the
other two differences, this patch adds macros __MSQ_PAD_BEFORE_TIME
and __MSQ_PAD_AFTER_TIME in a new bits/msq-pad.h header, so that
header is the only one needing to be provided on architectures with
differences in this area, and everything else can go in a single
common bits/msq.h header.  Once we have __TIMESIZE, the generic
bits/msq-pad.h can change to use that instead of __WORDSIZE, at which
point the x86 version of bits/msq-pad.h won't be needed either.

Tested for x86_64 and x86, and with build-many-glibcs.py.

	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
	bits/msq-pad.h.
	* sysdeps/unix/sysv/linux/bits/msq.h: Include <bits/msq-pad.h>
	instead of <bits/wordsize.h>.
	(msgqnum_t): Define as __syscall_ulong_t.
	(msglen_t): Likewise.
	(__MSQ_PAD_TIME): New macro, depending on [__MSQ_PAD_BEFORE_TIME]
	and [__MSQ_PAD_AFTER_TIME].
	(struct msqid_ds): Define time fields using __MSQ_PAD_TIME.  Use
	__syscall_ulong_t instead of unsigned long int.
	* sysdeps/unix/sysv/linux/bits/msq-pad.h: New file.
	* sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/msq-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/x86/bits/msq-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/msq.h: Remove.
	* sysdeps/unix/sysv/linux/mips/bits/msq.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/msq.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/msq.h: Likewise.
	* sysdeps/unix/sysv/linux/x86/bits/msq.h: Likewise.

1 files changed, 19 insertions, 18 deletions

diff --git a/sysdeps/unix/sysv/linux/bits/msq.h b/sysdeps/unix/sysv/linux/bits/msq.h
index 0fe85e578d..5f43fa36a6 100644
--- a/sysdeps/unix/sysv/linux/bits/msq.h
+++ b/sysdeps/unix/sysv/linux/bits/msq.h
@@ -20,7 +20,7 @@
 #endif
 
 #include <bits/types.h>
-#include <bits/wordsize.h>
+#include <bits/msq-pad.h>
 
 /* Define options for message queue functions.  */
 #define MSG_NOERROR	010000	/* no error if message is too big */
@@ -30,34 +30,35 @@
 #endif
 
 /* Types used in the structure definition.  */
-typedef unsigned long int msgqnum_t;
-typedef unsigned long int msglen_t;
+typedef __syscall_ulong_t msgqnum_t;
+typedef __syscall_ulong_t msglen_t;
 
+#if __MSQ_PAD_BEFORE_TIME
+# define __MSQ_PAD_TIME(NAME, RES)				\
+  unsigned long int __glibc_reserved ## RES; __time_t NAME
+#elif __MSQ_PAD_AFTER_TIME
+# define __MSQ_PAD_TIME(NAME, RES)				\
+  __time_t NAME; unsigned long int __glibc_reserved ## RES
+#else
+# define __MSQ_PAD_TIME(NAME, RES)		\
+  __time_t NAME
+#endif
 
 /* Structure of record for one message inside the kernel.
    The type `struct msg' is opaque.  */
 struct msqid_ds
 {
   struct ipc_perm msg_perm;	/* structure describing operation permission */
-  __time_t msg_stime;		/* time of last msgsnd command */
-#if __WORDSIZE == 32
-  unsigned long int __glibc_reserved1;
-#endif
-  __time_t msg_rtime;		/* time of last msgrcv command */
-#if __WORDSIZE == 32
-  unsigned long int __glibc_reserved2;
-#endif
-  __time_t msg_ctime;		/* time of last change */
-#if __WORDSIZE == 32
-  unsigned long int __glibc_reserved3;
-#endif
-  unsigned long int __msg_cbytes; /* current number of bytes on queue */
+  __MSQ_PAD_TIME (msg_stime, 1);	/* time of last msgsnd command */
+  __MSQ_PAD_TIME (msg_rtime, 2);	/* time of last msgrcv command */
+  __MSQ_PAD_TIME (msg_ctime, 3);	/* time of last change */
+  __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
   msgqnum_t msg_qnum;		/* number of messages currently on queue */
   msglen_t msg_qbytes;		/* max number of bytes allowed on queue */
   __pid_t msg_lspid;		/* pid of last msgsnd() */
   __pid_t msg_lrpid;		/* pid of last msgrcv() */
-  unsigned long int __glibc_reserved4;
-  unsigned long int __glibc_reserved5;
+  __syscall_ulong_t __glibc_reserved4;
+  __syscall_ulong_t __glibc_reserved5;
 };
 
 #ifdef __USE_MISC