>From 316e468f0b6d251ab07ffc00c075dc7a7bad7b0f Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Fri, 31 Jul 2020 13:15:50 +0200
Subject: [PATCH 1/3] doc: Refer to Gnulib instead of asking clients to provide
 replacement code.

* doc/autoconf.texi (Particular Functions): Point to Gnulib for all macros that
may call AC_LIBOBJ, namely AC_FUNC_ALLOCA, AC_FUNC_MALLOC, AC_FUNC_OBSTACK,
AC_FUNC_REALLOC, AC_FUNC_STRNLEN.
---
 doc/autoconf.texi | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/doc/autoconf.texi b/doc/autoconf.texi
index d4d4331..5d44937 100644
--- a/doc/autoconf.texi
+++ b/doc/autoconf.texi
@@ -4966,6 +4966,10 @@ void *alloca (size_t);
 #endif
 @end group
 @end example
+
+If you don't want to maintain this piece of code in your package manually,
+you can instead use the Gnulib module @code{alloca-opt} or @code{alloca}.
+@xref{Gnulib}.
 @end defmac
 
 @defmac AC_FUNC_CHOWN
@@ -5301,6 +5305,9 @@ rpl_malloc (size_t n)
 
 The result of this macro is cached in the
 @code{ac_cv_func_malloc_0_nonnull} variable.
+
+If you don't want to maintain a @code{malloc.c} file in your package
+manually, you can instead use the Gnulib module @code{malloc-gnu}.
 @end defmac
 
 @defmac AC_FUNC_MBRTOWC
@@ -5379,6 +5386,9 @@ If the obstacks are found, define @code{HAVE_OBSTACK}, else require an
 
 The result of this macro is cached in the @code{ac_cv_func_obstack}
 variable.
+
+The @code{AC_FUNC_OBSTACK} macro is obsolescent.  New programs should use
+Gnulib's @code{obstack} module.  @xref{Gnulib}.
 @end defmac
 
 @defmac AC_FUNC_REALLOC
@@ -5398,6 +5408,9 @@ the native @code{realloc} is not used in the main project.  See
 
 The result of this macro is cached in the
 @code{ac_cv_func_realloc_0_nonnull} variable.
+
+If you don't want to maintain a @code{realloc.c} file in your package
+manually, you can instead use the Gnulib module @code{realloc-gnu}.
 @end defmac
 
 @defmac AC_FUNC_SELECT_ARGTYPES
@@ -5558,6 +5571,9 @@ from AIX 4.3), require an @code{AC_LIBOBJ} replacement for it.
 
 This macro caches its result in the @code{ac_cv_func_strnlen_working}
 variable.
+
+The @code{AC_FUNC_STRNLEN} macro is obsolescent.  New programs should
+use Gnulib's @code{strnlen} module.  @xref{Gnulib}.
 @end defmac
 
 @anchor{AC_FUNC_UTIME_NULL}
-- 
2.7.4