Y2038: provide size of default time_t for target architecture

    To determine whether the default time_t interfaces are 32-bit
    and so need conversions, or are 64-bit and so are compatible
    with the internal 64-bit type without conversions, a macro
    giving the size of the  default time_t is also required.
    This macro is called __TIMESIZE.

    This macro can then be used instead of __WORDSIZE in msq-pad.h
    and shm-pad.h files, which in turn allows removing their x86
    variants, and in sem-pad.h files but keeping the x86 variant.

    This patch was tested by running 'make check' on branch master
    then applying this patch and running 'make check' again, and
    checking that both 'make check' yield identical results.
    This was done on x86_64-linux-gnu and i686-linux-gnu.

	* bits/timesize.h: New file.
	* stdlib/Makefile (headers): Add bits/timesize.h.
	* sysdeps/unix/sysv/linux/bits/msq-pad.h
	(__MSQ_PAD_AFTER_TIME): Use __TIMESIZE instead of __WORDSIZE.
	* sysdeps/unix/sysv/linux/bits/sem-pad.h
	(__SEM_PAD_AFTER_TIME): Likewise.
	* sysdeps/unix/sysv/linux/bits/shm-pad.h
	(__SHM_PAD_AFTER_TIME): Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h
	(__MSQ_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h
	(__SEM_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h
	(__SHM_PAD_BEFORE_TIME, __SHM_PAD_BETWEEN_TIME_AND_SEGSZ): Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/msq-pad.h
        (__MSQ_PAD_AFTER_TIME, __MSQ_PAD_BEFORE_TIME): Likewise.
        * sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h
        (__MSQ_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h
	(__SEM_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h
	(__SHM_PAD_BEFORE_TIME, __SHM_PAD_BETWEEN_TIME_AND_SEGSZ): Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h
	(__MSQ_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h
	(__SEM_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h
	(__SHM_PAD_BEFORE_TIME): Likewise.
	* sysdeps/unix/sysv/linux/x86/bits/msq-pad.h: Delete file.
	* sysdeps/unix/sysv/linux/x86/bits/shm-pad.h: Likewise.
	* sysdeps/unix/sysv/linux/x86/bits/timesize.h: New file.

17 files changed, 74 insertions, 51 deletions

diff --git a/ChangeLog b/ChangeLog
index cda75db202..9b44e8de76 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,37 @@
+2018-10-24  Albert ARIBAUD <albert.aribaud@3adev.fr>
+
+	* bits/timesize.h: New file.
+	* stdlib/Makefile (headers): Add bits/timesize.h.
+	* sysdeps/unix/sysv/linux/bits/msq-pad.h
+	(__MSQ_PAD_AFTER_TIME): Use __TIMESIZE instead of __WORDSIZE.
+	* sysdeps/unix/sysv/linux/bits/sem-pad.h
+	(__SEM_PAD_AFTER_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/bits/shm-pad.h
+	(__SHM_PAD_AFTER_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h
+	(__MSQ_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h
+	(__SEM_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h
+	(__SHM_PAD_BEFORE_TIME, __SHM_PAD_BETWEEN_TIME_AND_SEGSZ): Likewise.
+	* sysdeps/unix/sysv/linux/mips/bits/msq-pad.h
+        (__MSQ_PAD_AFTER_TIME, __MSQ_PAD_BEFORE_TIME): Likewise.
+        * sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h
+        (__MSQ_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h
+	(__SEM_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h
+	(__SHM_PAD_BEFORE_TIME, __SHM_PAD_BETWEEN_TIME_AND_SEGSZ): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h
+	(__MSQ_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h
+	(__SEM_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h
+	(__SHM_PAD_BEFORE_TIME): Likewise.
+	* sysdeps/unix/sysv/linux/x86/bits/msq-pad.h: Delete file.
+	* sysdeps/unix/sysv/linux/x86/bits/shm-pad.h: Likewise.
+	* sysdeps/unix/sysv/linux/x86/bits/timesize.h: New file.
+
 2018-10-24  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* benchtests/Makefile (CPPFLAGS-nonlib): Add -DUSE_RDTSCP if
diff --git a/sysdeps/unix/sysv/linux/x86/bits/shm-pad.h b/bits/timesize.h
index 277a70fe6c..cc47ff165f 100644
--- a/sysdeps/unix/sysv/linux/x86/bits/shm-pad.h
+++ b/bits/timesize.h
@@ -1,4 +1,4 @@
-/* Define where padding goes in struct shmid_ds.  x86 version.
+/* Bit size of the time_t type at glibc build time, general case.
    Copyright (C) 2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,15 +16,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef _SYS_SHM_H
-# error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
-#endif
+#include <bits/wordsize.h>
 
-#ifdef __x86_64__
-# define __SHM_PAD_AFTER_TIME 0
-#else
-# define __SHM_PAD_AFTER_TIME 1
-#endif
-#define __SHM_PAD_BEFORE_TIME 0
-#define __SHM_SEGSZ_AFTER_TIME 0
-#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ 0
+/* Size in bits of the 'time_t' type of the default ABI.  */
+#define __TIMESIZE	__WORDSIZE
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 01194bbf7c..1773a341b5 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -24,7 +24,7 @@ include ../Makeconfig
 
 headers	:= stdlib.h bits/stdlib.h bits/stdlib-ldbl.h bits/stdlib-float.h      \
 	   monetary.h bits/monetary-ldbl.h				      \
-	   inttypes.h stdint.h bits/wordsize.h				      \
+	   inttypes.h stdint.h bits/wordsize.h bits/timesize.h		      \
 	   errno.h sys/errno.h bits/errno.h bits/types/error_t.h	      \
 	   ucontext.h sys/ucontext.h bits/indirect-return.h		      \
 	   alloca.h fmtmsg.h						      \
diff --git a/sysdeps/unix/sysv/linux/bits/msq-pad.h b/sysdeps/unix/sysv/linux/bits/msq-pad.h
index 97dee0beff..53f367dfa2 100644
--- a/sysdeps/unix/sysv/linux/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/bits/msq-pad.h
@@ -20,12 +20,12 @@
 # error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 /* On most architectures, padding goes after time fields for 32-bit
    systems and is omitted for 64-bit systems.  Some architectures pad
    before time fields instead, or omit padding despite being
    32-bit.  */
 
-#define __MSQ_PAD_AFTER_TIME (__WORDSIZE == 32)
+#define __MSQ_PAD_AFTER_TIME (__TIMESIZE == 32)
 #define __MSQ_PAD_BEFORE_TIME 0
diff --git a/sysdeps/unix/sysv/linux/bits/sem-pad.h b/sysdeps/unix/sysv/linux/bits/sem-pad.h
index c57fea4ac8..488b591d5a 100644
--- a/sysdeps/unix/sysv/linux/bits/sem-pad.h
+++ b/sysdeps/unix/sysv/linux/bits/sem-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/sem-pad.h> directly; include <sys/sem.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 /* On most architectures, padding goes after time fields for 32-bit
    systems and is omitted for 64-bit systems.  Some architectures pad
@@ -29,5 +29,5 @@
    used for struct semid64_ds in <asm/sembuf.h>, as glibc does not do
    layout conversions for this structure.  */
 
-#define __SEM_PAD_AFTER_TIME (__WORDSIZE == 32)
+#define __SEM_PAD_AFTER_TIME (__TIMESIZE == 32)
 #define __SEM_PAD_BEFORE_TIME 0
diff --git a/sysdeps/unix/sysv/linux/bits/shm-pad.h b/sysdeps/unix/sysv/linux/bits/shm-pad.h
index 9233c95a9f..d3cc5ebde6 100644
--- a/sysdeps/unix/sysv/linux/bits/shm-pad.h
+++ b/sysdeps/unix/sysv/linux/bits/shm-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 /* On most architectures, padding goes after time fields for 32-bit
    systems and is omitted for 64-bit systems.  Some architectures pad
@@ -31,7 +31,7 @@
    layout used for struct shmid64_ds in <asm/shmbuf.h>, as glibc does
    not do layout conversions for this structure.  */
 
-#define __SHM_PAD_AFTER_TIME (__WORDSIZE == 32)
+#define __SHM_PAD_AFTER_TIME (__TIMESIZE == 32)
 #define __SHM_PAD_BEFORE_TIME 0
 #define __SHM_SEGSZ_AFTER_TIME 0
 #define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ 0
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h b/sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h
index 10b26b7ea6..05db3fd65b 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/msq-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __MSQ_PAD_AFTER_TIME 0
-#define __MSQ_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __MSQ_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h b/sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h
index a938c2c92b..f250f64426 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/sem-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/sem-pad.h> directly; include <sys/sem.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SEM_PAD_AFTER_TIME 0
-#define __SEM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SEM_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h b/sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h
index 6a9c5ddce2..8764bde08b 100644
--- a/sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h
+++ b/sysdeps/unix/sysv/linux/hppa/bits/shm-pad.h
@@ -20,9 +20,9 @@
 # error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SHM_PAD_AFTER_TIME 0
-#define __SHM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SHM_PAD_BEFORE_TIME (__TIMESIZE == 32)
 #define __SHM_SEGSZ_AFTER_TIME 1
-#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ (__WORDSIZE == 32)
+#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/mips/bits/msq-pad.h b/sysdeps/unix/sysv/linux/mips/bits/msq-pad.h
index 1ddfb0d271..530babe3f9 100644
--- a/sysdeps/unix/sysv/linux/mips/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/mips/bits/msq-pad.h
@@ -20,12 +20,12 @@
 # error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #ifdef __MIPSEL__
-# define __MSQ_PAD_AFTER_TIME (__WORDSIZE == 32)
+# define __MSQ_PAD_AFTER_TIME (__TIMESIZE == 32)
 # define __MSQ_PAD_BEFORE_TIME 0
 #else
 # define __MSQ_PAD_AFTER_TIME 0
-# define __MSQ_PAD_BEFORE_TIME (__WORDSIZE == 32)
+# define __MSQ_PAD_BEFORE_TIME (__TIMESIZE == 32)
 #endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h b/sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h
index 9680176abb..d19dfd5126 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/msq-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __MSQ_PAD_AFTER_TIME 0
-#define __MSQ_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __MSQ_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h b/sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h
index d4c9a93956..d7571cc755 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/sem-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/sem-pad.h> directly; include <sys/sem.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SEM_PAD_AFTER_TIME 0
-#define __SEM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SEM_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h b/sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h
index 69a7e4a648..c8c2d44775 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/shm-pad.h
@@ -20,9 +20,9 @@
 # error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SHM_PAD_AFTER_TIME 0
-#define __SHM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SHM_PAD_BEFORE_TIME (__TIMESIZE == 32)
 #define __SHM_SEGSZ_AFTER_TIME 1
-#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ (__WORDSIZE == 32)
+#define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h b/sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h
index 3dfeb07a48..72324e8428 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/msq-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __MSQ_PAD_AFTER_TIME 0
-#define __MSQ_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __MSQ_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h b/sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h
index b85f6b70a2..27266d48d5 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/sem-pad.h
@@ -20,7 +20,7 @@
 # error "Never use <bits/sem-pad.h> directly; include <sys/sem.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SEM_PAD_AFTER_TIME 0
-#define __SEM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SEM_PAD_BEFORE_TIME (__TIMESIZE == 32)
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h b/sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h
index c4d0c2feb8..fa3cc18a05 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/shm-pad.h
@@ -20,9 +20,9 @@
 # error "Never use <bits/shm-pad.h> directly; include <sys/shm.h> instead."
 #endif
 
-#include <bits/wordsize.h>
+#include <bits/timesize.h>
 
 #define __SHM_PAD_AFTER_TIME 0
-#define __SHM_PAD_BEFORE_TIME (__WORDSIZE == 32)
+#define __SHM_PAD_BEFORE_TIME (__TIMESIZE == 32)
 #define __SHM_SEGSZ_AFTER_TIME 1
 #define __SHM_PAD_BETWEEN_TIME_AND_SEGSZ 0
diff --git a/sysdeps/unix/sysv/linux/x86/bits/msq-pad.h b/sysdeps/unix/sysv/linux/x86/bits/timesize.h
index 5d46956c77..8b88ab84b0 100644
--- a/sysdeps/unix/sysv/linux/x86/bits/msq-pad.h
+++ b/sysdeps/unix/sysv/linux/x86/bits/timesize.h
@@ -1,4 +1,4 @@
-/* Define where padding goes in struct msqid_ds.  x86 version.
+/* Bit size of the time_t type at glibc build time, x86-64 and x32 case.
    Copyright (C) 2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
@@ -16,13 +16,10 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#ifndef _SYS_MSG_H
-# error "Never use <bits/msq-pad.h> directly; include <sys/msg.h> instead."
-#endif
-
-#ifdef __x86_64__
-# define __MSQ_PAD_AFTER_TIME 0
+#if defined __x86_64__ && defined __ILP32__
+/* For x32, time is 64-bit even though word size is 32-bit.  */
+# define __TIMESIZE	64
 #else
-# define __MSQ_PAD_AFTER_TIME 1
+/* For others, time size is word size.  */
+# define __TIMESIZE	__WORDSIZE
 #endif
-#define __MSQ_PAD_BEFORE_TIME 0