Update from Gnulib

This includes:
2018-03-07 maint: write-file-hooks -> before-save-hook
2018-03-05 binary-io: pacify gcc -Wunused-parameter
2018-03-05 fflush: adjust to glibc 2.28 libio.h removal
* build-aux/config.guess, build-aux/config.sub:
* build-aux/gitlog-to-changelog, build-aux/install-sh:
* build-aux/move-if-change, build-aux/update-copyright:
* doc/misc/texinfo.tex, lib/binary-io.h, lib/fpending.c:
* lib/stdio-impl.h: Copy from Gnulib.

3 files changed, 9 insertions, 5 deletions

diff --git a/lib/binary-io.h b/lib/binary-io.h
index cce1301d56c..1f21fc051f6 100644
--- a/lib/binary-io.h
+++ b/lib/binary-io.h
@@ -47,10 +47,8 @@ _GL_INLINE_HEADER_BEGIN
   /* Use a function rather than a macro, to avoid gcc warnings
      "warning: statement with no effect".  */
 BINARY_IO_INLINE int
-__gl_setmode (int fd, int mode)
+__gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
 {
-  (void) fd;
-  (void) mode;
   return O_BINARY;
 }
 #endif
@@ -59,7 +57,7 @@ __gl_setmode (int fd, int mode)
 extern int __gl_setmode_check (int);
 #else
 BINARY_IO_INLINE int
-__gl_setmode_check (int fd) { return 0; }
+__gl_setmode_check (int fd _GL_UNUSED) { return 0; }
 #endif
 
 /* Set FD's mode to MODE, which should be either O_TEXT or O_BINARY.
diff --git a/lib/fpending.c b/lib/fpending.c
index c84e3a5b4ec..789f50e4e4b 100644
--- a/lib/fpending.c
+++ b/lib/fpending.c
@@ -32,7 +32,7 @@ __fpending (FILE *fp)
   /* Most systems provide FILE as a struct and the necessary bitmask in
      <stdio.h>, because they need it for implementing getc() and putc() as
      fast macros.  */
-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
   return fp->_IO_write_ptr - fp->_IO_write_base;
 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
   /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
diff --git a/lib/stdio-impl.h b/lib/stdio-impl.h
index 78d896e9f55..05c5752a243 100644
--- a/lib/stdio-impl.h
+++ b/lib/stdio-impl.h
@@ -18,6 +18,12 @@
    the same implementation of stdio extension API, except that some fields
    have different naming conventions, or their access requires some casts.  */
 
+/* Glibc 2.28 made _IO_IN_BACKUP private.  For now, work around this
+   problem by defining it ourselves.  FIXME: Do not rely on glibc
+   internals.  */
+#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN
+# define _IO_IN_BACKUP 0x100
+#endif
 
 /* BSD stdio derived implementations.  */