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buildroot/package/m4/0002-fflush-be-more-paranoid-about-libio.h-change.patch
Yann E. MORIN c48f8a6462 package/m4: fix build on host with glibc-2.28 
glibc-2.28 did quite some lifting in their headers, which breaks the
way some packages were detecting glibc, like gnulib.

However, packages do bundle gnulib (it was meant to be bundled),
and so does m4.

Since m4 hasn't seen the slightest commit since 2017-01-09, it is
bundling an old gnulib version, that predates glibc-2.28, and thus
breaks. It also means that upstream hasn't already fixed the issue.

Furthermore, as upstream is using a git submodule for gnulib, and
that the paths are not the same in the release tarball (in lib/)
and in the git tree (in gnulib/), we can't do a plain backport.

So, we selectively backport the two patches from gnulib upstream,
restricted to only the files that happen to be used in m4.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Reported-by: c32 on IRC
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2018-08-17 18:57:25 +02:00

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From 74d9d6a293d7462dea8f83e7fc5ac792e956a0ad Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 8 Mar 2018 16:42:45 -0800
Subject: [PATCH 2/2] fflush: be more paranoid about libio.h change
Suggested by Eli Zaretskii in:
https://lists.gnu.org/r/emacs-devel/2018-03/msg00270.html
* lib/fbufmode.c (fbufmode):
* lib/fflush.c (clear_ungetc_buffer_preserving_position)
(disable_seek_optimization, rpl_fflush):
* lib/fpending.c (__fpending):
* lib/fpurge.c (fpurge):
* lib/freadable.c (freadable):
* lib/freadahead.c (freadahead):
* lib/freading.c (freading):
* lib/freadptr.c (freadptr):
* lib/freadseek.c (freadptrinc):
* lib/fseeko.c (fseeko):
* lib/fseterr.c (fseterr):
* lib/fwritable.c (fwritable):
* lib/fwriting.c (fwriting):
Look at _IO_ftrylockfile as well as at _IO_EOF_SEEN.
---
lib/fflush.c | 9 ++++++---
lib/fpending.c | 3 ++-
lib/fpurge.c | 3 ++-
lib/freadahead.c | 3 ++-
lib/freading.c | 3 ++-
lib/fseeko.c | 6 ++++--
6 files changed, 18 insertions(+), 9 deletions(-)
[yann.morin.1998@free.fr: partially backport from upstream gnulib]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
diff --git a/lib/fflush.c b/build-aux/gnulib/lib/fflush.c
index a6edfa105..a140b7ad9 100644
--- a/lib/fflush.c
+++ b/lib/fflush.c
@@ -33,7 +33,8 @@
#undef fflush
-#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+/* GNU libc, BeOS, Haiku, Linux libc5 */
/* Clear the stream's ungetc buffer, preserving the value of ftello (fp). */
static void
@@ -72,7 +73,8 @@ clear_ungetc_buffer (FILE *fp)
#endif
-#if ! (defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */)
+#if ! (defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1)
+/* GNU libc, BeOS, Haiku, Linux libc5 */
# if (defined __sferror || defined __DragonFly__ || defined __ANDROID__) && defined __SNPT
/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
@@ -148,7 +150,8 @@ rpl_fflush (FILE *stream)
if (stream == NULL || ! freading (stream))
return fflush (stream);
-#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
clear_ungetc_buffer_preserving_position (stream);
diff --git a/lib/fpending.c b/build-aux/gnulib/lib/fpending.c
index 789f50e4e..7bc235ded 100644
--- a/lib/fpending.c
+++ b/lib/fpending.c
@@ -32,7 +32,8 @@ __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_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __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/fpurge.c b/build-aux/gnulib/lib/fpurge.c
index 3aedcc373..554790b56 100644
--- a/lib/fpurge.c
+++ b/lib/fpurge.c
@@ -62,7 +62,8 @@ fpurge (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_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+# if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
fp->_IO_read_end = fp->_IO_read_ptr;
fp->_IO_write_ptr = fp->_IO_write_base;
/* Avoid memory leak when there is an active ungetc buffer. */
diff --git a/lib/freadahead.c b/build-aux/gnulib/lib/freadahead.c
index 23ec76ee5..ed3dd0ebd 100644
--- a/lib/freadahead.c
+++ b/lib/freadahead.c
@@ -30,7 +30,8 @@ extern size_t __sreadahead (FILE *);
size_t
freadahead (FILE *fp)
{
-#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
if (fp->_IO_write_ptr > fp->_IO_write_base)
return 0;
return (fp->_IO_read_end - fp->_IO_read_ptr)
diff --git a/lib/freading.c b/build-aux/gnulib/lib/freading.c
index c24d0c88a..790f92ca3 100644
--- a/lib/freading.c
+++ b/lib/freading.c
@@ -31,7 +31,8 @@ freading (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_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+# if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
return ((fp->_flags & _IO_NO_WRITES) != 0
|| ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
&& fp->_IO_read_base != NULL));
diff --git a/lib/fseeko.c b/build-aux/gnulib/lib/fseeko.c
index 193f4e8ce..e5c5172e7 100644
--- a/lib/fseeko.c
+++ b/lib/fseeko.c
@@ -47,7 +47,8 @@ fseeko (FILE *fp, off_t offset, int whence)
#endif
/* These tests are based on fpurge.c. */
-#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
if (fp->_IO_read_end == fp->_IO_read_ptr
&& fp->_IO_write_ptr == fp->_IO_write_base
&& fp->_IO_save_base == NULL)
@@ -123,7 +124,8 @@ fseeko (FILE *fp, off_t offset, int whence)
return -1;
}
-#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
+ /* GNU libc, BeOS, Haiku, Linux libc5 */
fp->_flags &= ~_IO_EOF_SEEN;
fp->_offset = pos;
#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
--
2.14.1
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