Update from gnulib

This includes:
2018-01-31 environ: Fix link error on 64-bit Cygwin
2018-01-27 Fix malfunction of socket functions on HP-UX in 64-bit mode
2018-01-26 manywarnings: fix maintainer comment
2018-01-23 Merge strftime.c changes from glibc
* build-aux/config.guess, build-aux/config.sub, doc/misc/texinfo.tex:
* lib/gnulib.mk.in, lib/nstrftime.c, lib/unistd.in.h, m4/extensions.m4:
* m4/manywarnings.m4: Update.

2 files changed, 8 insertions, 2 deletions

diff --git a/m4/extensions.m4 b/m4/extensions.m4
index d1b23215b05..71a854f8bfa 100644
--- a/m4/extensions.m4
+++ b/m4/extensions.m4
@@ -1,4 +1,4 @@
-# serial 17  -*- Autoconf -*-
+# serial 18  -*- Autoconf -*-
 # Enable extensions on systems that normally disable them.
 
 # Copyright (C) 2003, 2006-2018 Free Software Foundation, Inc.
@@ -118,6 +118,11 @@ dnl configure.ac when using autoheader 2.62.
 #ifndef _XOPEN_SOURCE
 # undef _XOPEN_SOURCE
 #endif
+/* Enable X/Open compliant socket functions that do not require linking
+   with -lxnet on HP-UX 11.11.  */
+#ifndef _HPUX_ALT_XOPEN_SOCKET_API
+# undef _HPUX_ALT_XOPEN_SOCKET_API
+#endif
 /* Enable general extensions on Solaris.  */
 #ifndef __EXTENSIONS__
 # undef __EXTENSIONS__
@@ -163,6 +168,7 @@ dnl configure.ac when using autoheader 2.62.
           [ac_cv_should_define__xopen_source=yes])])])
   test $ac_cv_should_define__xopen_source = yes &&
     AC_DEFINE([_XOPEN_SOURCE], [500])
+  AC_DEFINE([_HPUX_ALT_XOPEN_SOCKET_API])
 ])# AC_USE_SYSTEM_EXTENSIONS
 
 # gl_USE_SYSTEM_EXTENSIONS
diff --git a/m4/manywarnings.m4 b/m4/manywarnings.m4
index dda3d468aef..18249b8f2ea 100644
--- a/m4/manywarnings.m4
+++ b/m4/manywarnings.m4
@@ -106,7 +106,7 @@ m4_defun([gl_MANYWARN_ALL_GCC(C)],
   # To compare this list to your installed GCC's, run this Bash command:
   #
   # comm -3 \
-  #  <(sed -n 's/^  *\(-[^ ]*\) .*/\1/p' manywarnings.m4 | sort) \
+  #  <(sed -n 's/^  *\(-[^ 0-9][^ ]*\) .*/\1/p' manywarnings.m4 | sort) \
   #  <(gcc --help=warnings | sed -n 's/^  \(-[^ ]*\) .*/\1/p' | sort |
   #      grep -v -x -F -f <(
   #         awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec))