Update from Gnulib

This incorporates:
2020-05-09 stdio: don't redefine _GL_ATTRIBUTE_FORMAT
2020-05-09 dirent, stdlib, string: don't redefine _GL_ATTRIBUTE_PURE
2020-05-08 limits-h: define LONG_BIT correctly on Haiku/x86_64
2020-05-08 ignore-value tests: use module 'attribute'
2020-05-06 attribute: minor style fixes
* build-aux/config.sub, doc/misc/texinfo.tex, lib/attribute.h:
* lib/dirent.in.h, lib/limits.in.h, lib/stdio.in.h, lib/stdlib.in.h:
* lib/string.in.h, m4/gnulib-common.m4:
Copy from Gnulib.

6 files changed, 50 insertions, 25 deletions

diff --git a/lib/attribute.h b/lib/attribute.h
index 8ef9a399ade..c5919d97005 100644
--- a/lib/attribute.h
+++ b/lib/attribute.h
@@ -33,26 +33,26 @@
 /* Selected GCC attributes; see:
    https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
    These names begin with 'ATTRIBUTE_' to avoid name clashes.  */
-#define ATTRIBUTE_ALLOC_SIZE(args) _GL_ATTRIBUTE_ALLOC_SIZE(args)
+#define ATTRIBUTE_ALLOC_SIZE(args) _GL_ATTRIBUTE_ALLOC_SIZE (args)
 #define ATTRIBUTE_ALWAYS_INLINE _GL_ATTRIBUTE_ALWAYS_INLINE
 #define ATTRIBUTE_ARTIFICIAL _GL_ATTRIBUTE_ARTIFICIAL
 #define ATTRIBUTE_COLD _GL_ATTRIBUTE_COLD
 #define ATTRIBUTE_CONST _GL_ATTRIBUTE_CONST
 #define ATTRIBUTE_DEPRECATED _GL_ATTRIBUTE_DEPRECATED
-#define ATTRIBUTE_ERROR(msg) _GL_ATTRIBUTE_ERROR(msg)
+#define ATTRIBUTE_ERROR(msg) _GL_ATTRIBUTE_ERROR (msg)
 #define ATTRIBUTE_EXTERNALLY_VISIBLE _GL_ATTRIBUTE_EXTERNALLY_VISIBLE
-#define ATTRIBUTE_FORMAT(spec) _GL_ATTRIBUTE_FORMAT(spec)
+#define ATTRIBUTE_FORMAT(spec) _GL_ATTRIBUTE_FORMAT (spec)
 #define ATTRIBUTE_LEAF _GL_ATTRIBUTE_LEAF
 #define ATTRIBUTE_MAY_ALIAS _GL_ATTRIBUTE_MAY_ALIAS
 #define ATTRIBUTE_MALLOC _GL_ATTRIBUTE_MALLOC
 #define ATTRIBUTE_NOINLINE _GL_ATTRIBUTE_NOINLINE
-#define ATTRIBUTE_NONNULL(args) _GL_ATTRIBUTE_NONNULL(args)
+#define ATTRIBUTE_NONNULL(args) _GL_ATTRIBUTE_NONNULL (args)
 #define ATTRIBUTE_NONSTRING _GL_ATTRIBUTE_NONSTRING
 #define ATTRIBUTE_NOTHROW _GL_ATTRIBUTE_NOTHROW
 #define ATTRIBUTE_PACKED _GL_ATTRIBUTE_PACKED
 #define ATTRIBUTE_PURE _GL_ATTRIBUTE_PURE
 #define ATTRIBUTE_RETURNS_NONNULL _GL_ATTRIBUTE_RETURNS_NONNULL
-#define ATTRIBUTE_SENTINEL(pos) _GL_ATTRIBUTE_SENTINEL(pos)
-#define ATTRIBUTE_WARNING(msg) _GL_ATTRIBUTE_WARNING(msg)
+#define ATTRIBUTE_SENTINEL(pos) _GL_ATTRIBUTE_SENTINEL (pos)
+#define ATTRIBUTE_WARNING(msg) _GL_ATTRIBUTE_WARNING (msg)
 
 #endif /* _GL_ATTRIBUTE_H */
diff --git a/lib/dirent.in.h b/lib/dirent.in.h
index f7c26810158..6fa44f0d28d 100644
--- a/lib/dirent.in.h
+++ b/lib/dirent.in.h
@@ -57,10 +57,12 @@ typedef struct gl_directory DIR;
 
 /* The __attribute__ feature is available in gcc versions 2.5 and later.
    The attribute __pure__ was added in gcc 2.96.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
-# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
-#else
-# define _GL_ATTRIBUTE_PURE /* empty */
+#ifndef _GL_ATTRIBUTE_PURE
+# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+#  define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+#  define _GL_ATTRIBUTE_PURE /* empty */
+# endif
 #endif
 
 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
diff --git a/lib/limits.in.h b/lib/limits.in.h
index 90c273fa178..d25c5237060 100644
--- a/lib/limits.in.h
+++ b/lib/limits.in.h
@@ -15,16 +15,32 @@
    You should have received a copy of the GNU General Public License
    along with this program; if not, see <https://www.gnu.org/licenses/>.  */
 
-#ifndef _@GUARD_PREFIX@_LIMITS_H
-
 #if __GNUC__ >= 3
 @PRAGMA_SYSTEM_HEADER@
 #endif
 @PRAGMA_COLUMNS@
 
-/* The include_next requires a split double-inclusion guard.  */
+#if defined _GL_ALREADY_INCLUDING_LIMITS_H
+/* Special invocation convention:
+   On Haiku/x86_64, we have a sequence of nested includes
+   <limits.h> -> <syslimits.h> -> <limits.h>.
+   In this situation, LONG_MAX and INT_MAX are not yet defined,
+   therefore we should not attempt to define LONG_BIT.  */
+
 #@INCLUDE_NEXT@ @NEXT_LIMITS_H@
 
+#else
+/* Normal invocation convention.  */
+
+#ifndef _@GUARD_PREFIX@_LIMITS_H
+
+# define _GL_ALREADY_INCLUDING_LIMITS_H
+
+/* The include_next requires a split double-inclusion guard.  */
+# @INCLUDE_NEXT@ @NEXT_LIMITS_H@
+
+# undef _GL_ALREADY_INCLUDING_LIMITS_H
+
 #ifndef _@GUARD_PREFIX@_LIMITS_H
 #define _@GUARD_PREFIX@_LIMITS_H
 
@@ -102,3 +118,4 @@
 
 #endif /* _@GUARD_PREFIX@_LIMITS_H */
 #endif /* _@GUARD_PREFIX@_LIMITS_H */
+#endif
diff --git a/lib/stdio.in.h b/lib/stdio.in.h
index 4a95f323a9a..6c338dd6c0b 100644
--- a/lib/stdio.in.h
+++ b/lib/stdio.in.h
@@ -62,10 +62,12 @@
    We enable _GL_ATTRIBUTE_FORMAT only if these are supported too, because
    gnulib and libintl do '#define printf __printf__' when they override
    the 'printf' function.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
-# define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
-#else
-# define _GL_ATTRIBUTE_FORMAT(spec) /* empty */
+#ifndef _GL_ATTRIBUTE_FORMAT
+# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
+#  define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
+# else
+#  define _GL_ATTRIBUTE_FORMAT(spec) /* empty */
+# endif
 #endif
 
 /* _GL_ATTRIBUTE_FORMAT_PRINTF
diff --git a/lib/stdlib.in.h b/lib/stdlib.in.h
index ec5f124a366..59f9e6c71d1 100644
--- a/lib/stdlib.in.h
+++ b/lib/stdlib.in.h
@@ -101,10 +101,12 @@ struct random_data
 
 /* The __attribute__ feature is available in gcc versions 2.5 and later.
    The attribute __pure__ was added in gcc 2.96.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
-# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
-#else
-# define _GL_ATTRIBUTE_PURE /* empty */
+#ifndef _GL_ATTRIBUTE_PURE
+# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+#  define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+#  define _GL_ATTRIBUTE_PURE /* empty */
+# endif
 #endif
 
 /* The definition of _Noreturn is copied here.  */
diff --git a/lib/string.in.h b/lib/string.in.h
index 596c99bf2e2..96e132f37d7 100644
--- a/lib/string.in.h
+++ b/lib/string.in.h
@@ -54,10 +54,12 @@
 
 /* The __attribute__ feature is available in gcc versions 2.5 and later.
    The attribute __pure__ was added in gcc 2.96.  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
-# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
-#else
-# define _GL_ATTRIBUTE_PURE /* empty */
+#ifndef _GL_ATTRIBUTE_PURE
+# if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+#  define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+# else
+#  define _GL_ATTRIBUTE_PURE /* empty */
+# endif
 #endif
 
 /* NetBSD 5.0 declares strsignal in <unistd.h>, not in <string.h>.  */