updated gnulib.

30 files changed, 216 insertions, 41 deletions

diff --git a/gl/Makefile.am b/gl/Makefile.am
index d7590d9aaf..85ca9b6506 100644
--- a/gl/Makefile.am
+++ b/gl/Makefile.am
@@ -1788,6 +1788,7 @@ unistd.h: unistd.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(ARG_NONNULL_H
 	      -e 's|@''REPLACE_FTRUNCATE''@|$(REPLACE_FTRUNCATE)|g' \
 	      -e 's|@''REPLACE_GETCWD''@|$(REPLACE_GETCWD)|g' \
 	      -e 's|@''REPLACE_GETDOMAINNAME''@|$(REPLACE_GETDOMAINNAME)|g' \
+	      -e 's|@''REPLACE_GETDTABLESIZE''@|$(REPLACE_GETDTABLESIZE)|g' \
 	      -e 's|@''REPLACE_GETLOGIN_R''@|$(REPLACE_GETLOGIN_R)|g' \
 	      -e 's|@''REPLACE_GETGROUPS''@|$(REPLACE_GETGROUPS)|g' \
 	      -e 's|@''REPLACE_GETPAGESIZE''@|$(REPLACE_GETPAGESIZE)|g' \
diff --git a/gl/dup2.c b/gl/dup2.c
index db12f630aa..f1b606d9b7 100644
--- a/gl/dup2.c
+++ b/gl/dup2.c
@@ -96,7 +96,11 @@ rpl_dup2 (int fd, int desired_fd)
   /* On Linux kernels 2.6.26-2.6.29, dup2 (fd, fd) returns -EBADF.
      On Cygwin 1.5.x, dup2 (1, 1) returns 0.
      On Cygwin 1.7.17, dup2 (1, -1) dumps core.
+     On Cygwin 1.7.25, dup2 (1, 256) can dump core.
      On Haiku, dup2 (fd, fd) mistakenly clears FD_CLOEXEC.  */
+#  if HAVE_SETDTABLESIZE
+  setdtablesize (desired_fd + 1);
+#  endif
   if (desired_fd < 0)
     fd = desired_fd;
   if (fd == desired_fd)
diff --git a/gl/m4/dup2.m4 b/gl/m4/dup2.m4
index 269cfdc112..dc3070c0d9 100644
--- a/gl/m4/dup2.m4
+++ b/gl/m4/dup2.m4
@@ -1,4 +1,4 @@
-#serial 19
+#serial 20
 dnl Copyright (C) 2002, 2005, 2007, 2009-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -39,9 +39,11 @@ AC_DEFUN([gl_FUNC_DUP2],
             /* Many gnulib modules require POSIX conformance of EBADF.  */
             if (dup2 (2, 1000000) == -1 && errno != EBADF)
               result |= 16;
-            /* Flush out a cygwin core dump.  */
+            /* Flush out some cygwin core dumps.  */
             if (dup2 (2, -1) != -1 || errno != EBADF)
               result |= 32;
+            dup2 (2, 255);
+            dup2 (2, 256);
             return result;
            ])
         ],
@@ -65,6 +67,7 @@ AC_DEFUN([gl_FUNC_DUP2],
       *yes) ;;
       *)
         REPLACE_DUP2=1
+        AC_CHECK_FUNCS([setdtablesize])
         ;;
     esac
   fi
diff --git a/gl/m4/extern-inline.m4 b/gl/m4/extern-inline.m4
index c4c5e7f221..e4454d8fe3 100644
--- a/gl/m4/extern-inline.m4
+++ b/gl/m4/extern-inline.m4
@@ -1,3 +1,4 @@
+# extern-inline.m4 serial 2
 dnl 'extern inline' a la ISO C99.
 
 dnl Copyright 2012-2013 Free Software Foundation, Inc.
@@ -19,27 +20,36 @@ AC_DEFUN([gl_EXTERN_INLINE],
    'reference to static identifier "f" in extern inline function'.
    This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
 
-   Suppress the use of extern inline on Apple's platforms, as Libc at least
-   through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g.,
+   Suppress the use of extern inline on problematic Apple configurations, as
+   Libc at least through Libc-825.26 (2013-04-09) mishandles it; see, e.g.,
    <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
    Perhaps Apple will fix this some day.  */
+#if (defined __APPLE__ \
+     && ((! defined _DONT_USE_CTYPE_INLINE_ \
+          && (defined __GNUC__ || defined __cplusplus)) \
+         || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
+             && defined __GNUC__ && ! defined __cplusplus)))
+# define _GL_EXTERN_INLINE_APPLE_BUG
+#endif
 #if ((__GNUC__ \
       ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
       : (199901L <= __STDC_VERSION__ \
          && !defined __HP_cc \
          && !(defined __SUNPRO_C && __STDC__))) \
-     && !defined __APPLE__)
+     && !defined _GL_EXTERN_INLINE_APPLE_BUG)
 # define _GL_INLINE inline
 # define _GL_EXTERN_INLINE extern inline
+# define _GL_EXTERN_INLINE_IN_USE
 #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
-       && !defined __APPLE__)
-# if __GNUC_GNU_INLINE__
+       && !defined _GL_EXTERN_INLINE_APPLE_BUG)
+# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
    /* __gnu_inline__ suppresses a GCC 4.2 diagnostic.  */
 #  define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
 # else
 #  define _GL_INLINE extern inline
 # endif
 # define _GL_EXTERN_INLINE extern
+# define _GL_EXTERN_INLINE_IN_USE
 #else
 # define _GL_INLINE static _GL_UNUSED
 # define _GL_EXTERN_INLINE static _GL_UNUSED
diff --git a/gl/m4/getdtablesize.m4 b/gl/m4/getdtablesize.m4
index 8f04b3b8c2..b3fa1af6a5 100644
--- a/gl/m4/getdtablesize.m4
+++ b/gl/m4/getdtablesize.m4
@@ -1,4 +1,4 @@
-# getdtablesize.m4 serial 4
+# getdtablesize.m4 serial 5
 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,8 +7,35 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_GETDTABLESIZE],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST])
   AC_CHECK_FUNCS_ONCE([getdtablesize])
-  if test $ac_cv_func_getdtablesize != yes; then
+  if test $ac_cv_func_getdtablesize = yes; then
+    # Cygwin 1.7.25 automatically increases the RLIMIT_NOFILE soft limit
+    # up to an unchangeable hard limit; all other platforms correctly
+    # require setrlimit before getdtablesize() can report a larger value.
+    AC_CACHE_CHECK([whether getdtablesize works],
+      [gl_cv_func_getdtablesize_works],
+      [AC_RUN_IFELSE([
+        AC_LANG_PROGRAM([[#include <unistd.h>]],
+          [int size = getdtablesize();
+           if (dup2 (0, getdtablesize()) != -1)
+             return 1;
+           if (size != getdtablesize())
+             return 2;
+          ])],
+        [gl_cv_func_getdtablesize_works=yes],
+        [gl_cv_func_getdtablesize_works=no],
+        [case "$host_os" in
+          cygwin*) # on cygwin 1.5.25, getdtablesize() automatically grows
+            gl_cv_func_getdtablesize_works="guessing no" ;;
+          *) gl_cv_func_getdtablesize_works="guessing yes" ;;
+         esac])
+      ])
+    case "$gl_cv_func_getdtablesize_works" in
+      *yes) ;;
+      *) REPLACE_GETDTABLESIZE=1 ;;
+    esac
+  else
     HAVE_GETDTABLESIZE=0
   fi
 ])
diff --git a/gl/m4/gnulib-comp.m4 b/gl/m4/gnulib-comp.m4
index eb65fb07f4..d8c8792e49 100644
--- a/gl/m4/gnulib-comp.m4
+++ b/gl/m4/gnulib-comp.m4
@@ -688,7 +688,7 @@ changequote([, ])dnl
   fi
   gl_UNISTD_MODULE_INDICATOR([getcwd])
   gl_FUNC_GETDTABLESIZE
-  if test $HAVE_GETDTABLESIZE = 0; then
+  if test $HAVE_GETDTABLESIZE = 0 || test $REPLACE_GETDTABLESIZE = 1; then
     AC_LIBOBJ([getdtablesize])
     gl_PREREQ_GETDTABLESIZE
   fi
diff --git a/gl/m4/intl.m4 b/gl/m4/intl.m4
index 959bd0421f..dffcd881b8 100644
--- a/gl/m4/intl.m4
+++ b/gl/m4/intl.m4
@@ -1,4 +1,4 @@
-# intl.m4 serial 23 (gettext-0.18.3)
+# intl.m4 serial 24 (gettext-0.18.3)
 dnl Copyright (C) 1995-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -61,7 +61,7 @@ AC_DEFUN([AM_INTL_SUBDIR],
 
   dnl Use the _snprintf function only if it is declared (because on NetBSD it
   dnl is defined as a weak alias of snprintf; we prefer to use the latter).
-  AC_CHECK_DECLS([_snprintf _snwprintf], , , [#include <stdio.h>])
+  AC_CHECK_DECLS([_snprintf, _snwprintf], , , [#include <stdio.h>])
 
   dnl Use the *_unlocked functions only if they are declared.
   dnl (because some of them were defined without being declared in Solaris
@@ -234,7 +234,7 @@ AC_DEFUN([gt_INTL_SUBDIR_CORE],
   dnl (because some of them were defined without being declared in Solaris
   dnl 2.5.1 but were removed in Solaris 2.6, whereas we want binaries built
   dnl on Solaris 2.5.1 to run on Solaris 2.6).
-  AC_CHECK_DECLS([feof_unlocked fgets_unlocked], , , [#include <stdio.h>])
+  AC_CHECK_DECLS([feof_unlocked, fgets_unlocked], , , [#include <stdio.h>])
 
   AM_ICONV
 
diff --git a/gl/m4/inttypes.m4 b/gl/m4/inttypes.m4
index 3b483d39f5..b06c77753b 100644
--- a/gl/m4/inttypes.m4
+++ b/gl/m4/inttypes.m4
@@ -148,6 +148,7 @@ AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
   HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
   HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])
   REPLACE_STRTOIMAX=0;   AC_SUBST([REPLACE_STRTOIMAX])
+  REPLACE_STRTOUMAX=0;   AC_SUBST([REPLACE_STRTOUMAX])
   INT32_MAX_LT_INTMAX_MAX=1;  AC_SUBST([INT32_MAX_LT_INTMAX_MAX])
   INT64_MAX_EQ_LONG_MAX='defined _LP64';  AC_SUBST([INT64_MAX_EQ_LONG_MAX])
   PRI_MACROS_BROKEN=0;   AC_SUBST([PRI_MACROS_BROKEN])
diff --git a/gl/m4/manywarnings.m4 b/gl/m4/manywarnings.m4
index be6d4c91c5..80b2476d25 100644
--- a/gl/m4/manywarnings.m4
+++ b/gl/m4/manywarnings.m4
@@ -1,4 +1,4 @@
-# manywarnings.m4 serial 5
+# manywarnings.m4 serial 6
 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -204,6 +204,8 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC],
     -Wvla \
     -Wvolatile-register-var \
     -Wwrite-strings \
+    -fdiagnostics-show-option \
+    -funit-at-a-time \
     \
     ; do
     gl_manywarn_set="$gl_manywarn_set $gl_manywarn_item"
diff --git a/gl/m4/unistd_h.m4 b/gl/m4/unistd_h.m4
index 32dcfa5820..4231578cf2 100644
--- a/gl/m4/unistd_h.m4
+++ b/gl/m4/unistd_h.m4
@@ -1,4 +1,4 @@
-# unistd_h.m4 serial 66
+# unistd_h.m4 serial 67
 dnl Copyright (C) 2006-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -160,6 +160,7 @@ AC_DEFUN([gl_UNISTD_H_DEFAULTS],
   REPLACE_FTRUNCATE=0;    AC_SUBST([REPLACE_FTRUNCATE])
   REPLACE_GETCWD=0;       AC_SUBST([REPLACE_GETCWD])
   REPLACE_GETDOMAINNAME=0; AC_SUBST([REPLACE_GETDOMAINNAME])
+  REPLACE_GETDTABLESIZE=0; AC_SUBST([REPLACE_GETDTABLESIZE])
   REPLACE_GETLOGIN_R=0;   AC_SUBST([REPLACE_GETLOGIN_R])
   REPLACE_GETGROUPS=0;    AC_SUBST([REPLACE_GETGROUPS])
   REPLACE_GETPAGESIZE=0;  AC_SUBST([REPLACE_GETPAGESIZE])
diff --git a/gl/m4/warnings.m4 b/gl/m4/warnings.m4
index 184873283b..e3d239b64f 100644
--- a/gl/m4/warnings.m4
+++ b/gl/m4/warnings.m4
@@ -1,4 +1,4 @@
-# warnings.m4 serial 8
+# warnings.m4 serial 11
 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,15 +25,24 @@ m4_ifdef([AS_VAR_APPEND],
 AC_DEFUN([gl_COMPILER_OPTION_IF],
 [AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
 AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
+AS_LITERAL_IF([$1],
+  [m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
+  [gl_positive="$1"
+case $gl_positive in
+  -Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
+esac
+m4_pushdef([gl_Positive], [$gl_positive])])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
   gl_save_compiler_FLAGS="$gl_Flags"
-  gl_AS_VAR_APPEND(m4_defn([gl_Flags]), [" $gl_unknown_warnings_are_errors $1"])
-  AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
-                    [AS_VAR_SET(gl_Warn, [yes])],
-                    [AS_VAR_SET(gl_Warn, [no])])
+  gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
+    [" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
+  AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
+                 [AS_VAR_SET(gl_Warn, [yes])],
+                 [AS_VAR_SET(gl_Warn, [no])])
   gl_Flags="$gl_save_compiler_FLAGS"
 ])
 AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
+m4_popdef([gl_Positive])dnl
 AS_VAR_POPDEF([gl_Flags])dnl
 AS_VAR_POPDEF([gl_Warn])dnl
 ])
diff --git a/gl/signal.in.h b/gl/signal.in.h
index c14fb609d4..4f19005342 100644
--- a/gl/signal.in.h
+++ b/gl/signal.in.h
@@ -195,6 +195,20 @@ typedef int verify_NSIG_constraint[NSIG <= 32 ? 1 : -1];
 
 # endif
 
+/* When also using extern inline, suppress the use of static inline in
+   standard headers of problematic Apple configurations, as Libc at
+   least through Libc-825.26 (2013-04-09) mishandles it; see, e.g.,
+   <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
+   Perhaps Apple will fix this some day.  */
+#if (defined _GL_EXTERN_INLINE_IN_USE && defined __APPLE__ \
+     && (defined __i386__ || defined __x86_64__))
+# undef sigaddset
+# undef sigdelset
+# undef sigemptyset
+# undef sigfillset
+# undef sigismember
+#endif
+
 /* Test whether a given signal is contained in a signal set.  */
 # if @HAVE_POSIX_SIGNALBLOCKING@
 /* This function is defined as a macro on Mac OS X.  */
diff --git a/gl/stdio-impl.h b/gl/stdio-impl.h
index a80e4f3d46..0edf21d41c 100644
--- a/gl/stdio-impl.h
+++ b/gl/stdio-impl.h
@@ -57,7 +57,7 @@
 #  define fp_ fp
 # endif
 
-# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */
+# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ || defined __ANDROID__ /* NetBSD >= 1.5ZA, OpenBSD, Android */
   /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
      and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
   struct __sfileext
diff --git a/gl/stdio.in.h b/gl/stdio.in.h
index 9ae3f0a745..f1700e0464 100644
--- a/gl/stdio.in.h
+++ b/gl/stdio.in.h
@@ -124,6 +124,15 @@
 #define _GL_STDIO_STRINGIZE(token) #token
 #define _GL_STDIO_MACROEXPAND_AND_STRINGIZE(token) _GL_STDIO_STRINGIZE(token)
 
+/* When also using extern inline, suppress the use of static inline in
+   standard headers of problematic Apple configurations, as Libc at
+   least through Libc-825.26 (2013-04-09) mishandles it; see, e.g.,
+   <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
+   Perhaps Apple will fix this some day.  */
+#if (defined _GL_EXTERN_INLINE_IN_USE && defined __APPLE__ \
+     && defined __GNUC__ && defined __STDC__)
+# undef putc_unlocked
+#endif
 
 #if @GNULIB_DPRINTF@
 # if @REPLACE_DPRINTF@
diff --git a/gl/sys_socket.in.h b/gl/sys_socket.in.h
index 368afe43ff..8bbd5e489f 100644
--- a/gl/sys_socket.in.h
+++ b/gl/sys_socket.in.h
@@ -63,6 +63,9 @@
 #ifndef _@GUARD_PREFIX@_SYS_SOCKET_H
 #define _@GUARD_PREFIX@_SYS_SOCKET_H
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef _GL_SYS_SOCKET_INLINE
 # define _GL_SYS_SOCKET_INLINE _GL_INLINE
diff --git a/gl/sys_time.in.h b/gl/sys_time.in.h
index ef39b837bd..84a17c9fec 100644
--- a/gl/sys_time.in.h
+++ b/gl/sys_time.in.h
@@ -24,11 +24,12 @@
 #endif
 @PRAGMA_COLUMNS@
 
-/* On Cygwin, <sys/time.h> includes itself recursively via <sys/select.h>.
+/* On Cygwin and on many BSDish systems, <sys/time.h> includes itself
+   recursively via <sys/select.h>.
    Simply delegate to the system's header in this case; it is a no-op.
    Without this extra ifdef, the C++ gettimeofday declaration below
    would be a forward declaration in gnulib's nested <sys/time.h>.  */
-#ifdef _CYGWIN_SYS_TIME_H
+#if defined _CYGWIN_SYS_TIME_H || defined _SYS_TIME_H || defined _SYS_TIME_H_
 # @INCLUDE_NEXT@ @NEXT_SYS_TIME_H@
 #else
 
diff --git a/gl/tests/Makefile.am b/gl/tests/Makefile.am
index f4c8b3df2a..f20087cf59 100644
--- a/gl/tests/Makefile.am
+++ b/gl/tests/Makefile.am
@@ -523,6 +523,7 @@ inttypes.h: inttypes.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_U
 	      -e 's/@''HAVE_DECL_STRTOIMAX''@/$(HAVE_DECL_STRTOIMAX)/g' \
 	      -e 's/@''HAVE_DECL_STRTOUMAX''@/$(HAVE_DECL_STRTOUMAX)/g' \
 	      -e 's/@''REPLACE_STRTOIMAX''@/$(REPLACE_STRTOIMAX)/g' \
+	      -e 's/@''REPLACE_STRTOUMAX''@/$(REPLACE_STRTOUMAX)/g' \
 	      -e 's/@''INT32_MAX_LT_INTMAX_MAX''@/$(INT32_MAX_LT_INTMAX_MAX)/g' \
 	      -e 's/@''INT64_MAX_EQ_LONG_MAX''@/$(INT64_MAX_EQ_LONG_MAX)/g' \
 	      -e 's/@''UINT32_MAX_LT_UINTMAX_MAX''@/$(UINT32_MAX_LT_UINTMAX_MAX)/g' \
diff --git a/gl/tests/binary-io.h b/gl/tests/binary-io.h
index 317fe3d3c2..423c2ae3ff 100644
--- a/gl/tests/binary-io.h
+++ b/gl/tests/binary-io.h
@@ -25,6 +25,9 @@
    so we include it here first.  */
 #include <stdio.h>
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef BINARY_IO_INLINE
 # define BINARY_IO_INLINE _GL_INLINE
diff --git a/gl/tests/getdtablesize.c b/gl/tests/getdtablesize.c
index 9947405af6..355c17e3b9 100644
--- a/gl/tests/getdtablesize.c
+++ b/gl/tests/getdtablesize.c
@@ -22,11 +22,11 @@
 
 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
 
-#include <stdio.h>
+# include <stdio.h>
 
-#include "msvc-inval.h"
+# include "msvc-inval.h"
 
-#if HAVE_MSVC_INVALID_PARAMETER_HANDLER
+# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
 static int
 _setmaxstdio_nothrow (int newmax)
 {
@@ -44,10 +44,11 @@ _setmaxstdio_nothrow (int newmax)
 
   return result;
 }
-# define _setmaxstdio _setmaxstdio_nothrow
-#endif
+#  define _setmaxstdio _setmaxstdio_nothrow
+# endif
 
-/* Cache for the previous getdtablesize () result.  */
+/* Cache for the previous getdtablesize () result.  Safe to cache because
+   Windows also lacks setrlimit.  */
 static int dtablesize;
 
 int
@@ -83,4 +84,24 @@ getdtablesize (void)
   return dtablesize;
 }
 
+#elif HAVE_GETDTABLESIZE
+
+# include <sys/resource.h>
+# undef getdtablesize
+
+int
+rpl_getdtablesize(void)
+{
+  /* To date, this replacement is only compiled for Cygwin 1.7.25,
+     which auto-increased the RLIMIT_NOFILE soft limit until it
+     hits the compile-time constant hard limit of 3200.  Although
+     that version of cygwin supported a child process inheriting
+     a smaller soft limit, the smaller limit is not enforced, so
+     we might as well just report the hard limit.  */
+  struct rlimit lim;
+  if (!getrlimit (RLIMIT_NOFILE, &lim) && lim.rlim_max != RLIM_INFINITY)
+    return lim.rlim_max;
+  return getdtablesize ();
+}
+
 #endif
diff --git a/gl/tests/inttypes.in.h b/gl/tests/inttypes.in.h
index 1893f5569d..05a22fff79 100644
--- a/gl/tests/inttypes.in.h
+++ b/gl/tests/inttypes.in.h
@@ -1105,12 +1105,22 @@ _GL_WARN_ON_USE (strtoimax, "strtoimax is unportable - "
 #endif
 
 #if @GNULIB_STRTOUMAX@
-# if !@HAVE_DECL_STRTOUMAX@
-#  undef strtoumax
+# if @REPLACE_STRTOUMAX@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef strtoumax
+#   define strtoumax rpl_strtoumax
+#  endif
+_GL_FUNCDECL_RPL (strtoumax, uintmax_t,
+                  (const char *, char **, int) _GL_ARG_NONNULL ((1)));
+_GL_CXXALIAS_RPL (strtoumax, uintmax_t, (const char *, char **, int));
+# else
+#  if !@HAVE_DECL_STRTOUMAX@
+#   undef strtoumax
 _GL_FUNCDECL_SYS (strtoumax, uintmax_t,
                   (const char *, char **, int) _GL_ARG_NONNULL ((1)));
-# endif
+#  endif
 _GL_CXXALIAS_SYS (strtoumax, uintmax_t, (const char *, char **, int));
+# endif
 _GL_CXXALIASWARN (strtoumax);
 #elif defined GNULIB_POSIXCHECK
 # undef strtoumax
diff --git a/gl/tests/macros.h b/gl/tests/macros.h
index 60ba894d89..1ceb815116 100644
--- a/gl/tests/macros.h
+++ b/gl/tests/macros.h
@@ -48,8 +48,8 @@
     {                                                                        \
       if (!(expr))                                                           \
         {                                                                    \
-          fprintf (ASSERT_STREAM, "%s:%d: assertion failed\n",               \
-                   __FILE__, __LINE__);                                      \
+          fprintf (ASSERT_STREAM, "%s:%d: assertion '%s' failed\n",     \
+                   __FILE__, __LINE__, #expr);                          \
           fflush (ASSERT_STREAM);                                            \
           abort ();                                                          \
         }                                                                    \
diff --git a/gl/tests/strerror-override.h b/gl/tests/strerror-override.h
index 3b8f24b995..0d086b873b 100644
--- a/gl/tests/strerror-override.h
+++ b/gl/tests/strerror-override.h
@@ -48,7 +48,7 @@
      || GNULIB_defined_EOWNERDEAD \
      || GNULIB_defined_ENOTRECOVERABLE \
      || GNULIB_defined_EILSEQ
-extern const char *strerror_override (int errnum);
+extern const char *strerror_override (int errnum) _GL_ATTRIBUTE_CONST;
 # else
 #  define strerror_override(ignored) NULL
 # endif
diff --git a/gl/tests/test-dup2.c b/gl/tests/test-dup2.c
index ecb2692d2a..44039f102b 100644
--- a/gl/tests/test-dup2.c
+++ b/gl/tests/test-dup2.c
@@ -150,6 +150,15 @@ main (void)
   errno = 0;
   ASSERT (dup2 (fd, -2) == -1);
   ASSERT (errno == EBADF);
+  if (bad_fd > 256)
+    {
+      ASSERT (dup2 (fd, 255) == 255);
+      ASSERT (dup2 (fd, 256) == 256);
+      ASSERT (close (255) == 0);
+      ASSERT (close (256) == 0);
+    }
+  ASSERT (dup2 (fd, bad_fd - 1) == bad_fd - 1);
+  ASSERT (close (bad_fd - 1) == 0);
   errno = 0;
   ASSERT (dup2 (fd, bad_fd) == -1);
   ASSERT (errno == EBADF);
diff --git a/gl/tests/test-getdtablesize.c b/gl/tests/test-getdtablesize.c
index 7046481ba3..b371ccf0d4 100644
--- a/gl/tests/test-getdtablesize.c
+++ b/gl/tests/test-getdtablesize.c
@@ -29,6 +29,8 @@ int
 main (int argc, char *argv[])
 {
   ASSERT (getdtablesize () >= 3);
+  ASSERT (dup2 (0, getdtablesize() - 1) == getdtablesize () - 1);
+  ASSERT (dup2 (0, getdtablesize()) == -1);
 
   return 0;
 }
diff --git a/gl/tests/test-sys_select.c b/gl/tests/test-sys_select.c
index cd84c0103b..1604699879 100644
--- a/gl/tests/test-sys_select.c
+++ b/gl/tests/test-sys_select.c
@@ -40,8 +40,9 @@ SIGNATURE_CHECK (FD_ZERO, void, (fd_set *));
 /* Check that the 'struct timeval' type is defined.  */
 struct timeval a;
 
-/* Check that &a.tv_sec is a 'time_t *', ignoring signedness issues.  */
-typedef int verify_tv_sec_type[sizeof (a.tv_sec) == sizeof (time_t) ? 1 : -1];
+/* Check that a.tv_sec is wide enough to hold a time_t, ignoring
+   signedness issues.  */
+typedef int verify_tv_sec_type[sizeof (time_t) <= sizeof (a.tv_sec) ? 1 : -1];
 
 /* Check that sigset_t is defined.  */
 sigset_t t2;
diff --git a/gl/tests/test-sys_time.c b/gl/tests/test-sys_time.c
index 1389b52008..80628423e1 100644
--- a/gl/tests/test-sys_time.c
+++ b/gl/tests/test-sys_time.c
@@ -23,8 +23,9 @@
 /* Check that the 'struct timeval' type is defined.  */
 struct timeval a;
 
-/* Check that &a.tv_sec is a 'time_t *', ignoring signedness issues.  */
-typedef int verify_tv_sec_type[sizeof (a.tv_sec) == sizeof (time_t) ? 1 : -1];
+/* Check that a.tv_sec is wide enough to hold a time_t, ignoring
+   signedness issues.  */
+typedef int verify_tv_sec_type[sizeof (time_t) <= sizeof (a.tv_sec) ? 1 : -1];
 
 int
 main (void)
diff --git a/gl/u64.h b/gl/u64.h
index 11946d4510..de6599038a 100644
--- a/gl/u64.h
+++ b/gl/u64.h
@@ -19,6 +19,9 @@
 
 #include <stdint.h>
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef _GL_U64_INLINE
 # define _GL_U64_INLINE _GL_INLINE
diff --git a/gl/unistd.in.h b/gl/unistd.in.h
index 69c94cce90..d1a025b31d 100644
--- a/gl/unistd.in.h
+++ b/gl/unistd.in.h
@@ -116,6 +116,9 @@
 # include <getopt.h>
 #endif
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef _GL_UNISTD_INLINE
 # define _GL_UNISTD_INLINE _GL_INLINE
@@ -651,10 +654,19 @@ _GL_WARN_ON_USE (getdomainname, "getdomainname is unportable - "
 #if @GNULIB_GETDTABLESIZE@
 /* Return the maximum number of file descriptors in the current process.
    In POSIX, this is same as sysconf (_SC_OPEN_MAX).  */
-# if !@HAVE_GETDTABLESIZE@
+# if @REPLACE_GETDTABLESIZE@
+#  if !(defined __cplusplus && defined GNULIB_NAMESPACE)
+#   undef getdtablesize
+#   define getdtablesize rpl_getdtablesize
+#  endif
+_GL_FUNCDECL_RPL (getdtablesize, int, (void));
+_GL_CXXALIAS_RPL (getdtablesize, int, (void));
+# else
+#  if !@HAVE_GETDTABLESIZE@
 _GL_FUNCDECL_SYS (getdtablesize, int, (void));
-# endif
+#  endif
 _GL_CXXALIAS_SYS (getdtablesize, int, (void));
+# endif
 _GL_CXXALIASWARN (getdtablesize);
 #elif defined GNULIB_POSIXCHECK
 # undef getdtablesize
diff --git a/gl/verify.h b/gl/verify.h
index 950cfa191b..7223c1ab66 100644
--- a/gl/verify.h
+++ b/gl/verify.h
@@ -250,6 +250,30 @@ template <int w>
 
 #define verify(R) _GL_VERIFY (R, "verify (" #R ")")
 
+#ifndef __has_builtin
+# 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.  */
+
+#if (__has_builtin (__builtin_unreachable) \
+     || 4 < __GNUC__ + (5 <= __GNUC_MINOR__))
+# define assume(R) ((R) ? (void) 0 : __builtin_unreachable ())
+#elif 1200 <= _MSC_VER
+# define assume(R) __assume (R)
+#elif (defined lint \
+       && (__has_builtin (__builtin_trap) \
+           || 3 < __GNUC__ + (3 < __GNUC_MINOR__ + (4 <= __GNUC_PATCHLEVEL__))))
+  /* Doing it this way helps various packages when configured with
+     --enable-gcc-warnings, which compiles with -Dlint.  It's nicer
+     when 'assume' silences warnings even with older GCCs.  */
+# define assume(R) ((R) ? (void) 0 : __builtin_trap ())
+#else
+# define assume(R) ((void) (0 && (R)))
+#endif
+
 /* @assert.h omit end@  */
 
 #endif
diff --git a/gl/xsize.h b/gl/xsize.h
index aa08ef4885..3014bb2e39 100644
--- a/gl/xsize.h
+++ b/gl/xsize.h
@@ -27,6 +27,9 @@
 # include <stdint.h>
 #endif
 
+#ifndef _GL_INLINE_HEADER_BEGIN
+ #error "Please include config.h first."
+#endif
 _GL_INLINE_HEADER_BEGIN
 #ifndef XSIZE_INLINE
 # define XSIZE_INLINE _GL_INLINE