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update for glibc libio.h removal in 2.28+
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see
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https://src.fedoraproject.org/rpms/m4/c/814d592134fad36df757f9a61422d164ea2c6c9b?branch=master
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Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=4af4a4a718]
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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Index: m4-1.4.18/lib/fflush.c
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===================================================================
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--- m4-1.4.18.orig/lib/fflush.c
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+++ m4-1.4.18/lib/fflush.c
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@@ -33,7 +33,7 @@
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 #undef fflush
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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 /* Clear the stream's ungetc buffer, preserving the value of ftello (fp).  */
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 static void
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@@ -72,7 +72,7 @@ clear_ungetc_buffer (FILE *fp)
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 #endif
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-#if ! (defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */)
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+#if ! (defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */)
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 # if (defined __sferror || defined __DragonFly__ || defined __ANDROID__) && defined __SNPT
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 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Android */
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@@ -148,7 +148,7 @@ rpl_fflush (FILE *stream)
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   if (stream == NULL || ! freading (stream))
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     return fflush (stream);
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   clear_ungetc_buffer_preserving_position (stream);
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Index: m4-1.4.18/lib/fpending.c
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===================================================================
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--- m4-1.4.18.orig/lib/fpending.c
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+++ m4-1.4.18/lib/fpending.c
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@@ -32,7 +32,7 @@ __fpending (FILE *fp)
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   /* Most systems provide FILE as a struct and the necessary bitmask in
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      <stdio.h>, because they need it for implementing getc() and putc() as
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      fast macros.  */
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   return fp->_IO_write_ptr - fp->_IO_write_base;
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 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
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   /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Android */
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Index: m4-1.4.18/lib/fpurge.c
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===================================================================
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--- m4-1.4.18.orig/lib/fpurge.c
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+++ m4-1.4.18/lib/fpurge.c
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@@ -62,7 +62,7 @@ fpurge (FILE *fp)
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   /* Most systems provide FILE as a struct and the necessary bitmask in
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      <stdio.h>, because they need it for implementing getc() and putc() as
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      fast macros.  */
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-# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+# if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   fp->_IO_read_end = fp->_IO_read_ptr;
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   fp->_IO_write_ptr = fp->_IO_write_base;
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   /* Avoid memory leak when there is an active ungetc buffer.  */
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Index: m4-1.4.18/lib/freadahead.c
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===================================================================
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--- m4-1.4.18.orig/lib/freadahead.c
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+++ m4-1.4.18/lib/freadahead.c
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@@ -25,7 +25,7 @@
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 size_t
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 freadahead (FILE *fp)
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 {
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   if (fp->_IO_write_ptr > fp->_IO_write_base)
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     return 0;
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   return (fp->_IO_read_end - fp->_IO_read_ptr)
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Index: m4-1.4.18/lib/freading.c
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===================================================================
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--- m4-1.4.18.orig/lib/freading.c
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+++ m4-1.4.18/lib/freading.c
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@@ -31,7 +31,7 @@ freading (FILE *fp)
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   /* Most systems provide FILE as a struct and the necessary bitmask in
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      <stdio.h>, because they need it for implementing getc() and putc() as
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      fast macros.  */
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-# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+# if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   return ((fp->_flags & _IO_NO_WRITES) != 0
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           || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
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               && fp->_IO_read_base != NULL));
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Index: m4-1.4.18/lib/fseeko.c
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===================================================================
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--- m4-1.4.18.orig/lib/fseeko.c
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+++ m4-1.4.18/lib/fseeko.c
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@@ -47,7 +47,7 @@ fseeko (FILE *fp, off_t offset, int when
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 #endif
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   /* These tests are based on fpurge.c.  */
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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   if (fp->_IO_read_end == fp->_IO_read_ptr
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       && fp->_IO_write_ptr == fp->_IO_write_base
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       && fp->_IO_save_base == NULL)
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@@ -123,7 +123,7 @@ fseeko (FILE *fp, off_t offset, int when
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           return -1;
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         }
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-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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+#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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       fp->_flags &= ~_IO_EOF_SEEN;
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       fp->_offset = pos;
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 #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
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Index: m4-1.4.18/lib/stdio-impl.h
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===================================================================
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--- m4-1.4.18.orig/lib/stdio-impl.h
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+++ m4-1.4.18/lib/stdio-impl.h
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@@ -18,6 +18,12 @@
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    the same implementation of stdio extension API, except that some fields
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    have different naming conventions, or their access requires some casts.  */
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+/* Glibc 2.28 made _IO_IN_BACKUP private.  For now, work around this
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+   problem by defining it ourselves.  FIXME: Do not rely on glibc
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+   internals.  */
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+#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN
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+# define _IO_IN_BACKUP 0x100
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+#endif
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 /* BSD stdio derived implementations.  */
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