>From 64bdee095f60ec708937d73132b95377e27a827e Mon Sep 17 00:00:00 2001
From: Bruno Haible <bruno@clisp.org>
Date: Sun, 31 Jan 2021 12:39:31 +0100
Subject: [PATCH 2/6] Make it possible to compile realloc.c separately,
 unconditionally.

* modules/realloc-posix (configure.ac): Invoke gl_MODULE_INDICATOR.
* lib/realloc.c: Don't define rpl_realloc if not needed.
---
 ChangeLog             |  4 ++++
 lib/realloc.c         | 20 +++++++++++++-------
 modules/realloc-posix |  1 +
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index bc19d19..e9e2b36 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2021-01-31  Bruno Haible  <bruno@clisp.org>
 
+	Make it possible to compile realloc.c separately, unconditionally.
+	* modules/realloc-posix (configure.ac): Invoke gl_MODULE_INDICATOR.
+	* lib/realloc.c: Don't define rpl_realloc if not needed.
+
 	Make it possible to compile malloc.c separately, unconditionally.
 	* modules/malloc-posix (configure.ac): Invoke gl_MODULE_INDICATOR.
 	* lib/malloc.c: Don't define rpl_malloc if not needed.
diff --git a/lib/realloc.c b/lib/realloc.c
index 35caeab..51d8d21 100644
--- a/lib/realloc.c
+++ b/lib/realloc.c
@@ -37,7 +37,11 @@
 
 #include <stdlib.h>
 
-#include <errno.h>
+/* A function definition is only needed if NEED_REALLOC_GNU is defined above
+   or if the module 'realloc-posix' requests it.  */
+#if NEED_REALLOC_GNU || (GNULIB_REALLOC_POSIX && !HAVE_REALLOC_POSIX)
+
+# include <errno.h>
 
 /* Change the size of an allocated block of memory P to N bytes,
    with error checking.  If N is zero, change it to 1.  If P is NULL,
@@ -48,7 +52,7 @@ rpl_realloc (void *p, size_t n)
 {
   void *result;
 
-#if NEED_REALLOC_GNU
+# if NEED_REALLOC_GNU
   if (n == 0)
     {
       n = 1;
@@ -57,23 +61,25 @@ rpl_realloc (void *p, size_t n)
       free (p);
       p = NULL;
     }
-#endif
+# endif
 
   if (p == NULL)
     {
-#if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
+# if GNULIB_REALLOC_GNU && !NEED_REALLOC_GNU && !SYSTEM_MALLOC_GLIBC_COMPATIBLE
       if (n == 0)
         n = 1;
-#endif
+# endif
       result = malloc (n);
     }
   else
     result = realloc (p, n);
 
-#if !HAVE_REALLOC_POSIX
+# if !HAVE_REALLOC_POSIX
   if (result == NULL)
     errno = ENOMEM;
-#endif
+# endif
 
   return result;
 }
+
+#endif
diff --git a/modules/realloc-posix b/modules/realloc-posix
index 8e4924d..7f48110 100644
--- a/modules/realloc-posix
+++ b/modules/realloc-posix
@@ -15,6 +15,7 @@ if test $REPLACE_REALLOC = 1; then
   AC_LIBOBJ([realloc])
 fi
 gl_STDLIB_MODULE_INDICATOR([realloc-posix])
+gl_MODULE_INDICATOR([realloc-posix])
 
 Makefile.am:
 
-- 
2.7.4