Update from Gnulib

This incorporates:
2019-07-06 thread, lock, cond, tls: Remove support for Pth threads
2019-07-02 verify: document ‘assume’ better
2019-06-30 Include <stdlib.h> when needed
2019-06-30 inet_ntop, inet_pton: Avoid conflict with native Windows
* build-aux/config.sub, lib/faccessat.c, lib/fcntl.c, lib/fstatat.c:
* lib/readlinkat.c, lib/verify.h, m4/pthread_sigmask.m4:
* m4/sys_socket_h.m4: Copy from Gnulib.
* lib/gnulib.mk.in: Regenerate.

9 files changed, 45 insertions, 33 deletions

diff --git a/build-aux/config.sub b/build-aux/config.sub
index 5b158ac41c9..a318a468685 100755
--- a/build-aux/config.sub
+++ b/build-aux/config.sub
@@ -2,7 +2,7 @@
 # Configuration validation subroutine script.
 #   Copyright 1992-2019 Free Software Foundation, Inc.
 
-timestamp='2019-05-23'
+timestamp='2019-06-30'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -337,17 +337,14 @@ case $1 in
                                 basic_machine=m88k-harris
                                 os=sysv3
                                 ;;
-                        hp300)
+                        hp300 | hp300hpux)
                                 basic_machine=m68k-hp
+                                os=hpux
                                 ;;
                         hp300bsd)
                                 basic_machine=m68k-hp
                                 os=bsd
                                 ;;
-                        hp300hpux)
-                                basic_machine=m68k-hp
-                                os=hpux
-                                ;;
                         hppaosf)
                                 basic_machine=hppa1.1-hp
                                 os=osf
@@ -360,10 +357,6 @@ case $1 in
                                 basic_machine=i386-mach
                                 os=mach
                                 ;;
-                        vsta)
-                                basic_machine=i386-pc
-                                os=vsta
-                                ;;
                         isi68 | isi)
                                 basic_machine=m68k-isi
                                 os=sysv
@@ -612,6 +605,10 @@ case $1 in
                                 basic_machine=vax-dec
                                 os=vms
                                 ;;
+                        vsta)
+                                basic_machine=i386-pc
+                                os=vsta
+                                ;;
                         vxworks960)
                                 basic_machine=i960-wrs
                                 os=vxworks
@@ -1350,7 +1347,7 @@ case $os in
              | nindy* | vxsim* | vxworks* | ebmon* | hms* | mvs* \
              | clix* | riscos* | uniplus* | iris* | isc* | rtu* | xenix* \
              | knetbsd* | mirbsd* | netbsd* \
-             | bitrig* | openbsd* | solidbsd* | libertybsd* \
+             | bitrig* | openbsd* | solidbsd* | libertybsd* | os108* \
              | ekkobsd* | kfreebsd* | freebsd* | riscix* | lynxos* \
              | bosx* | nextstep* | cxux* | aout* | elf* | oabi* \
              | ptx* | coff* | ecoff* | winnt* | domain* | vsta* \
@@ -1368,7 +1365,8 @@ case $os in
              | powermax* | dnix* | nx6 | nx7 | sei* | dragonfly* \
              | skyos* | haiku* | rdos* | toppers* | drops* | es* \
              | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
-             | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi*)
+             | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
+             | nsk* | powerunix)
         # Remember, each alternative MUST END IN *, to match a version number.
                 ;;
         qnx*)
@@ -1452,9 +1450,6 @@ case $os in
         ns2)
                 os=nextstep2
                 ;;
-        nsk*)
-                os=nsk
-                ;;
         # Preserve the version number of sinix5.
         sinix5.*)
                 os=`echo $os | sed -e 's|sinix|sysv|'`
diff --git a/lib/faccessat.c b/lib/faccessat.c
index 6c63e61d83f..e8e581a54b5 100644
--- a/lib/faccessat.c
+++ b/lib/faccessat.c
@@ -22,9 +22,12 @@
 #define _GL_INCLUDING_UNISTD_H
 #include <config.h>
 
+/* Specification.  */
 #include <unistd.h>
+
 #include <errno.h>
 #include <fcntl.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #undef _GL_INCLUDING_UNISTD_H
diff --git a/lib/fcntl.c b/lib/fcntl.c
index 51f62ef78a8..a3ffaa6e47b 100644
--- a/lib/fcntl.c
+++ b/lib/fcntl.c
@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <limits.h>
 #include <stdarg.h>
+#include <stdlib.h>
 #include <unistd.h>
 
 #ifdef __KLIBC__
diff --git a/lib/fstatat.c b/lib/fstatat.c
index 019d3c61638..db864da7605 100644
--- a/lib/fstatat.c
+++ b/lib/fstatat.c
@@ -49,6 +49,7 @@ orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
 
 #include <errno.h>
 #include <fcntl.h>
+#include <stdlib.h>
 #include <string.h>
 
 #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
diff --git a/lib/gnulib.mk.in b/lib/gnulib.mk.in
index 6f978aeb0cc..85fdbd2df6f 100644
--- a/lib/gnulib.mk.in
+++ b/lib/gnulib.mk.in
@@ -1077,7 +1077,6 @@ gl_GNULIB_ENABLED_getdtablesize = @gl_GNULIB_ENABLED_getdtablesize@
 gl_GNULIB_ENABLED_getgroups = @gl_GNULIB_ENABLED_getgroups@
 gl_GNULIB_ENABLED_malloca = @gl_GNULIB_ENABLED_malloca@
 gl_GNULIB_ENABLED_open = @gl_GNULIB_ENABLED_open@
-gl_GNULIB_ENABLED_pathmax = @gl_GNULIB_ENABLED_pathmax@
 gl_GNULIB_ENABLED_strtoll = @gl_GNULIB_ENABLED_strtoll@
 gl_LIBOBJS = @gl_LIBOBJS@
 gl_LTLIBOBJS = @gl_LTLIBOBJS@
diff --git a/lib/readlinkat.c b/lib/readlinkat.c
index c0f3e59f6ce..069411690d6 100644
--- a/lib/readlinkat.c
+++ b/lib/readlinkat.c
@@ -18,8 +18,11 @@
 
 #include <config.h>
 
-#include <errno.h>
+/* Specification.  */
 #include <unistd.h>
+
+#include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 
diff --git a/lib/verify.h b/lib/verify.h
index f8e4eff026d..9b8e1ed20fa 100644
--- a/lib/verify.h
+++ b/lib/verify.h
@@ -259,9 +259,11 @@ template <int w>
 # define __has_builtin(x) 0
 #endif
 
-/* Assume that R always holds.  This lets the compiler optimize
-   accordingly.  R should not have side-effects; it may or may not be
-   evaluated.  Behavior is undefined if R is false.  */
+/* Assume that R always holds.  Behavior is undefined if R is false,
+   fails to evaluate, or has side effects.  Although assuming R can
+   help a compiler generate better code or diagnostics, performance
+   can suffer if R uses hard-to-optimize features such as function
+   calls not inlined by the compiler.  */
 
 #if (__has_builtin (__builtin_unreachable) \
      || 4 < __GNUC__ + (5 <= __GNUC_MINOR__))
diff --git a/m4/pthread_sigmask.m4 b/m4/pthread_sigmask.m4
index 648edf911fe..d788cf656ea 100644
--- a/m4/pthread_sigmask.m4
+++ b/m4/pthread_sigmask.m4
@@ -1,4 +1,4 @@
-# pthread_sigmask.m4 serial 17
+# pthread_sigmask.m4 serial 18
 dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -75,10 +75,6 @@ AC_DEFUN([gl_FUNC_PTHREAD_SIGMASK],
       else
         dnl pthread_sigmask may exist but does not interoperate with the chosen
         dnl multithreading facility.
-        dnl If "$gl_threads_api" = pth, we could use the function pth_sigmask,
-        dnl but it is equivalent to sigprocmask, so we choose to emulate
-        dnl pthread_sigmask with sigprocmask also in this case. This yields
-        dnl fewer link dependencies.
         if test $ac_cv_func_pthread_sigmask = yes; then
           REPLACE_PTHREAD_SIGMASK=1
         else
diff --git a/m4/sys_socket_h.m4 b/m4/sys_socket_h.m4
index 1ea7b0b3f32..d0a902061aa 100644
--- a/m4/sys_socket_h.m4
+++ b/m4/sys_socket_h.m4
@@ -1,4 +1,4 @@
-# sys_socket_h.m4 serial 23
+# sys_socket_h.m4 serial 24
 dnl Copyright (C) 2005-2019 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -104,17 +104,11 @@ AC_DEFUN([gl_PREREQ_SYS_H_SOCKET],
   gl_CHECK_NEXT_HEADERS([sys/socket.h])
   if test $ac_cv_header_sys_socket_h = yes; then
     HAVE_SYS_SOCKET_H=1
-    HAVE_WS2TCPIP_H=0
   else
     HAVE_SYS_SOCKET_H=0
-    if test $ac_cv_header_ws2tcpip_h = yes; then
-      HAVE_WS2TCPIP_H=1
-    else
-      HAVE_WS2TCPIP_H=0
-    fi
   fi
   AC_SUBST([HAVE_SYS_SOCKET_H])
-  AC_SUBST([HAVE_WS2TCPIP_H])
+  gl_PREREQ_SYS_H_WS2TCPIP
 ])
 
 # Common prerequisites of the <sys/socket.h> replacement and of the
@@ -142,6 +136,24 @@ AC_DEFUN([gl_PREREQ_SYS_H_WINSOCK2],
   AC_SUBST([HAVE_WINSOCK2_H])
 ])
 
+# Common prerequisites of the <sys/socket.h> replacement and of the
+# <arpa/inet.h> replacement.
+# Sets and substitutes HAVE_WS2TCPIP_H.
+AC_DEFUN([gl_PREREQ_SYS_H_WS2TCPIP],
+[
+  AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])
+  if test $ac_cv_header_sys_socket_h = yes; then
+    HAVE_WS2TCPIP_H=0
+  else
+    if test $ac_cv_header_ws2tcpip_h = yes; then
+      HAVE_WS2TCPIP_H=1
+    else
+      HAVE_WS2TCPIP_H=0
+    fi
+  fi
+  AC_SUBST([HAVE_WS2TCPIP_H])
+])
+
 AC_DEFUN([gl_SYS_SOCKET_MODULE_INDICATOR],
 [
   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.