Garbage-collect Gnulib sources

Remove Gnulib sources no longer needed or used.
admin/merge-gnulib is typically not smart enough to do that.
* configure.ac: Do not call gl_EEMALLOC, as it is no longer
supplied or needed.
* lib/explicit_bzero.c, lib/malloc/scratch_buffer_dupfree.c:
* lib/xalloc-oversized.h, m4/eealloc.m4, m4/explicit_bzero.m4:
* m4/st_dm_mode.m4, m4/year2038.m4:
Remove.

3 files changed, 0 insertions, 181 deletions

diff --git a/lib/explicit_bzero.c b/lib/explicit_bzero.c
deleted file mode 100644
index 59d9895abfe..00000000000
--- a/lib/explicit_bzero.c
+++ /dev/null
@@ -1,74 +0,0 @@
-/* Erasure of sensitive data, generic implementation.
-   Copyright (C) 2016-2025 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-/* An assembler implementation of explicit_bzero can be created as an
-   assembler alias of an optimized bzero implementation.
-   Architecture-specific implementations also need to define
-   __explicit_bzero_chk.  */
-
-#if !_LIBC
-# include <config.h>
-#endif
-
-/* memset_s need this define */
-#if HAVE_MEMSET_S
-# define __STDC_WANT_LIB_EXT1__ 1
-#endif
-
-#include <string.h>
-
-#if defined _WIN32 && !defined __CYGWIN__
-# define  WIN32_LEAN_AND_MEAN
-# include <windows.h>
-#endif
-
-#if _LIBC
-/* glibc-internal users use __explicit_bzero_chk, and explicit_bzero
-   redirects to that.  */
-# undef explicit_bzero
-#endif
-
-/* Set LEN bytes of S to 0.  The compiler will not delete a call to
-   this function, even if S is dead after the call.  */
-void
-explicit_bzero (void *s, size_t len)
-{
-#if defined _WIN32 && !defined __CYGWIN__
-  (void) SecureZeroMemory (s, len);
-#elif HAVE_EXPLICIT_MEMSET
-  explicit_memset (s, '\0', len);
-#elif HAVE_MEMSET_S
-  (void) memset_s (s, len, '\0', len);
-#elif defined __GNUC__ && !defined __clang__
-  memset (s, '\0', len);
-  /* Compiler barrier.  */
-  asm volatile ("" ::: "memory");
-#elif defined __clang__
-  memset (s, '\0', len);
-  /* Compiler barrier.  */
-  /* With asm ("" ::: "memory") LLVM analyzes uses of 's' and finds that the
-     whole thing is dead and eliminates it.  Use 'g' to work around this
-     problem.  See <https://bugs.llvm.org/show_bug.cgi?id=15495#c11>.  */
-  __asm__ volatile ("" : : "g"(s) : "memory");
-#else
-  /* Invoke memset through a volatile function pointer.  This defeats compiler
-     optimizations.  */
-  void * (* const volatile volatile_memset) (void *, int, size_t) = memset;
-  (void) volatile_memset (s, '\0', len);
-#endif
-}
diff --git a/lib/malloc/scratch_buffer_dupfree.c b/lib/malloc/scratch_buffer_dupfree.c
deleted file mode 100644
index 0d31a765d5d..00000000000
--- a/lib/malloc/scratch_buffer_dupfree.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* Variable-sized buffer with on-stack default allocation.
-   Copyright (C) 2020-2025 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#ifndef _LIBC
-# include <libc-config.h>
-#endif
-
-#include <scratch_buffer.h>
-#include <string.h>
-
-void *
-__libc_scratch_buffer_dupfree (struct scratch_buffer *buffer, size_t size)
-{
-  void *data = buffer->data;
-  if (data == buffer->__space.__c)
-    {
-      void *copy = malloc (size);
-      return copy != NULL ? memcpy (copy, data, size) : NULL;
-    }
-  else
-    {
-      void *copy = realloc (data, size);
-      return copy != NULL ? copy : data;
-    }
-}
-libc_hidden_def (__libc_scratch_buffer_dupfree)
diff --git a/lib/xalloc-oversized.h b/lib/xalloc-oversized.h
deleted file mode 100644
index 808e97b8cae..00000000000
--- a/lib/xalloc-oversized.h
+++ /dev/null
@@ -1,66 +0,0 @@
-/* xalloc-oversized.h -- memory allocation size checking
-
-   Copyright (C) 1990-2000, 2003-2004, 2006-2025 Free Software
-   Foundation, Inc.
-
-   This file is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   This file is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
-
-#ifndef XALLOC_OVERSIZED_H_
-#define XALLOC_OVERSIZED_H_
-
-#include <stddef.h>
-#include <stdint.h>
-
-/* True if N * S does not fit into both ptrdiff_t and size_t.
-   N and S should be nonnegative and free of side effects.
-   This expands to a constant expression if N and S are both constants.
-   By gnulib convention, SIZE_MAX represents overflow in size_t
-   calculations, so the conservative size_t-based dividend to use here
-   is SIZE_MAX - 1.  */
-#define __xalloc_oversized(n, s) \
-  ((s) != 0 \
-   && (PTRDIFF_MAX < SIZE_MAX ? PTRDIFF_MAX : SIZE_MAX - 1) / (s) < (n))
-
-/* Return 1 if and only if an array of N objects, each of size S,
-   cannot exist reliably because its total size in bytes would exceed
-   MIN (PTRDIFF_MAX, SIZE_MAX - 1).
-
-   N and S should be nonnegative and free of side effects.
-
-   Warning: (xalloc_oversized (N, S) ? NULL : malloc (N * S)) can
-   misbehave if N and S are both narrower than ptrdiff_t and size_t,
-   and can be rewritten as (xalloc_oversized (N, S) ?  NULL
-   : malloc (N * (size_t) S)).
-
-   This is a macro, not a function, so that it works even if an
-   argument exceeds MAX (PTRDIFF_MAX, SIZE_MAX).  */
-#if 7 <= __GNUC__ && !defined __clang__ && PTRDIFF_MAX < SIZE_MAX
-# define xalloc_oversized(n, s) \
-   __builtin_mul_overflow_p (n, s, (ptrdiff_t) 1)
-#elif 5 <= __GNUC__ && !defined __clang__ && !defined __ICC \
-      && PTRDIFF_MAX < SIZE_MAX
-# define xalloc_oversized(n, s) \
-   (__builtin_constant_p (n) && __builtin_constant_p (s) \
-    ? __xalloc_oversized (n, s) \
-    : __extension__ \
-        ({ ptrdiff_t __xalloc_count; \
-           __builtin_mul_overflow (n, s, &__xalloc_count); }))
-
-/* Other compilers use integer division; this may be slower but is
-   more portable.  */
-#else
-# define xalloc_oversized(n, s) __xalloc_oversized (n, s)
-#endif
-
-#endif /* !XALLOC_OVERSIZED_H_ */