Better handling of collision with AIX stpncpy() function.

[gnulib.git] / m4 / realloc.m4

diff --git a/m4/realloc.m4 b/m4/realloc.m4
index b4afe93..9f746f1 100644 (file)
--- a/m4/realloc.m4
+++ b/m4/realloc.m4
@@ -1,33 +1,25 @@
-#serial 1
+# realloc.m4 serial 7
+dnl Copyright (C) 2002 Free Software Foundation, Inc.
+dnl This file is free software, distributed under the terms of the GNU
+dnl General Public License.  As a special exception to the GNU General
+dnl Public License, this file may be distributed as part of a program
+dnl that contains a configuration script generated by Autoconf, under
+dnl the same distribution terms as the rest of that program.
 
 dnl From Jim Meyering.
-dnl Determine whether realloc accepts 0 as its first argument.
+dnl Determine whether realloc works when both arguments are 0.
 dnl If it doesn't, arrange to use the replacement function.
-dnl
-dnl If you use this macro in a package, you should
-dnl add the following two lines to acconfig.h:
-dnl  /* Define to rpl_realloc if the replacement function should be used.  */
-dnl  #undef realloc
-dnl
 
-AC_DEFUN(jm_FUNC_REALLOC,
+AC_DEFUN([jm_FUNC_REALLOC],
 [
- AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
-  [AC_TRY_RUN([
-    char *realloc ();
-    int
-    main ()
-    {
-      exit (realloc (0, 1) ? 0 : 1);
-    }
-         ],
-        jm_cv_func_working_realloc=yes,
-        jm_cv_func_working_realloc=no,
-        dnl When crosscompiling, assume realloc is broken.
-        jm_cv_func_working_realloc=no)
-  ])
-  if test $jm_cv_func_working_realloc = no; then
-    LIBOBJS="$LIBOBJS realloc.o"
-    AC_DEFINE_UNQUOTED(realloc, rpl_realloc)
+  AC_REQUIRE([AC_FUNC_REALLOC])
+  dnl autoconf < 2.57 used the symbol ac_cv_func_realloc_works.
+  if test X"$ac_cv_func_realloc_0_nonnull" = Xno || test X"$ac_cv_func_realloc_works" = Xno; then
+    gl_PREREQ_REALLOC
   fi
 ])
+
+# Prerequisites of lib/realloc.c.
+AC_DEFUN([gl_PREREQ_REALLOC], [
+  :
+])