Merge the ChangeLogs into one ChangeLog, at the root.

[gnulib.git] / m4 / calloc.m4

diff --git a/m4/calloc.m4 b/m4/calloc.m4
index fee15dd..c109171 100644 (file)
--- a/m4/calloc.m4
+++ b/m4/calloc.m4
@@ -1,10 +1,14 @@
-#serial 1
+# calloc.m4 serial 6
 
-# FIXME: remove this whole file once we can depend
-# on having the definition from autoconf.
-undefine([AC_FUNC_CALLOC])
+# Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
 
-# Determine whether calloc (N, S) returns non-NULL when N*S is zero.
+# Written by Jim Meyering.
+
+# Determine whether calloc (N, S) returns non-NULL when N*S is zero,
+# and returns NULL when N*S overflows.
 # If so, define HAVE_CALLOC.  Otherwise, define calloc to rpl_calloc
 # and arrange to use a calloc wrapper function that does work in that case.
 
@@ -12,18 +16,10 @@ undefine([AC_FUNC_CALLOC])
 # -------------------------------------
 # If `calloc (0, 0)' is properly handled, run IF-WORKS, otherwise, IF-NOT.
 AC_DEFUN([_AC_FUNC_CALLOC_IF],
-[AC_REQUIRE([AC_HEADER_STDC])dnl
-AC_CHECK_HEADERS(stdlib.h)
+[AC_REQUIRE([AC_TYPE_SIZE_T])dnl
 AC_CACHE_CHECK([for GNU libc compatible calloc], ac_cv_func_calloc_0_nonnull,
-[AC_RUN_IFELSE(
-[AC_LANG_PROGRAM(
-[[#if STDC_HEADERS || HAVE_STDLIB_H
-# include <stdlib.h>
-#else
-char *calloc ();
-#endif
-]],
-                [exit (calloc (0, 0) ? 0 : 1);])],
+[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
+                 [exit (!calloc (0, 0) || calloc ((size_t) -1 / 8 + 1, 8));])],
               [ac_cv_func_calloc_0_nonnull=yes],
               [ac_cv_func_calloc_0_nonnull=no],
               [ac_cv_func_calloc_0_nonnull=no])])