Update from Gnulib by running admin/merge-gnulib

The following changes were made by hand,
so that admin/merge-gnulib could succeed
instead of failing because the diff didn’t match.
* admin/gnulib-patches/lib/getloadavg.c.diff:
Remove, as it is no longer needed now that recent
Gnulib has been merged.
* admin/merge-gnulib (GNULIB_TOOL_FLAGS):
Remove the --local-dir="$src"admin/gnulib-patches option,
as it is no longer needed either.

m4/gnulib-common.m4

@@ -1,5 +1,5 @@
 # gnulib-common.m4
-# serial 109
+# serial 110
 dnl Copyright (C) 2007-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -117,6 +117,9 @@ AC_DEFUN([gl_COMMON_BODY], [
 #  define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__)
 # else
 #  define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr
+/* The following lines list the first GCC version that supports the attribute.
+   Although the lines are not used in GCC 5 and later (as GCC 5 introduced
+   __has_attribute support), list GCC versions 5+ anyway for completeness.  */
 #  define _GL_ATTR_alloc_size _GL_GNUC_PREREQ (4, 3)
 #  define _GL_ATTR_always_inline _GL_GNUC_PREREQ (3, 2)
 #  define _GL_ATTR_artificial _GL_GNUC_PREREQ (4, 3)
@@ -137,14 +140,15 @@ AC_DEFUN([gl_COMMON_BODY], [
 #  endif
 #  define _GL_ATTR_noinline _GL_GNUC_PREREQ (3, 1)
 #  define _GL_ATTR_nonnull _GL_GNUC_PREREQ (3, 3)
+#  define _GL_ATTR_nonnull_if_nonzero _GL_GNUC_PREREQ (15, 1)
 #  define _GL_ATTR_nonstring _GL_GNUC_PREREQ (8, 0)
 #  define _GL_ATTR_nothrow _GL_GNUC_PREREQ (3, 3)
 #  define _GL_ATTR_packed _GL_GNUC_PREREQ (2, 7)
 #  define _GL_ATTR_pure _GL_GNUC_PREREQ (2, 96)
-#  define _GL_ATTR_reproducible 0 /* not yet supported, as of GCC 14 */
+#  define _GL_ATTR_reproducible _GL_GNUC_PREREQ (15, 1)
 #  define _GL_ATTR_returns_nonnull _GL_GNUC_PREREQ (4, 9)
 #  define _GL_ATTR_sentinel _GL_GNUC_PREREQ (4, 0)
-#  define _GL_ATTR_unsequenced 0 /* not yet supported, as of GCC 14 */
+#  define _GL_ATTR_unsequenced _GL_GNUC_PREREQ (15, 1)
 #  define _GL_ATTR_unused _GL_GNUC_PREREQ (2, 7)
 #  define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4)
 # endif
@@ -681,6 +685,17 @@ AC_DEFUN([gl_COMMON_BODY], [
 # endif
 #endif
 
+/* _GL_ATTRIBUTE_NONNULL_IF_NONZERO (NP, NI) declares that the argument NP
+   (a pointer) must not be NULL if the argument NI (an integer) is != 0.  */
+/* Applies to: functions.  */
+#ifndef _GL_ATTRIBUTE_NONNULL_IF_NONZERO
+# if _GL_HAS_ATTRIBUTE (nonnull_if_nonzero)
+#  define _GL_ATTRIBUTE_NONNULL_IF_NONZERO(np, ni) __attribute__ ((__nonnull_if_nonzero__ (np, ni)))
+# else
+#  define _GL_ATTRIBUTE_NONNULL_IF_NONZERO(np, ni)
+# endif
+#endif
+
 /* _GL_ATTRIBUTE_NONSTRING declares that the contents of a character array is
    not meant to be NUL-terminated.  */
 /* Applies to: struct/union members and variables that are arrays of element

m4/manywarnings.m4

@@ -97,7 +97,7 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC(C)],
   # export LC_ALL=C && comm -3 \
   #  <((sed -n 's/^  *\(-[^ 0-9][^ ]*\).*/\1/p' manywarnings.m4; \
   #     awk '/^[^#]/ {print $1}' ../build-aux/gcc-warning.spec) | sort) \
-  #  <(LC_ALL=C gcc --help=warnings | sed -n 's/^  \(-[^ ]*\) .*/\1/p' | sort)
+  #  <(gcc --help=warnings | sed -n 's/^  \(-[^ ]*\) .*/\1/p' | sort)
 
   $1=
   for gl_manywarn_item in -fanalyzer -fstrict-flex-arrays \
@@ -106,7 +106,6 @@ AC_DEFUN([gl_MANYWARN_ALL_GCC(C)],
     -Wbad-function-cast \
     -Wcast-align=strict \
     -Wdate-time \
-    -Wdisabled-optimization \
     -Wdouble-promotion \
     -Wduplicated-branches \
     -Wduplicated-cond \

m4/stddef_h.m4

@@ -1,5 +1,5 @@
 # stddef_h.m4
-# serial 19
+# serial 21
 dnl Copyright (C) 2009-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -91,12 +91,14 @@ AC_DEFUN_ONCE([gl_STDDEF_H],
   fi
 
   dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114870
-  dnl affects GCC 13 and 14.
+  dnl affects GCC 13.3 and 14.2.
   AC_CACHE_CHECK([whether <stddef.h> is idempotent],
     [gl_cv_stddef_idempotent],
     [AC_COMPILE_IFELSE([AC_LANG_SOURCE(
        [[
-       #if __GNUC__ == 13 || __GNUC__ == 14
+       #if \
+           ((__GNUC__ == 13 && __GNUC_MINOR__ <= 3) \
+            || (__GNUC__ == 14 && __GNUC_MINOR__ <= 2))
         #error "bug 114870 is present"
        #endif
        ]])],