broken-realloc.m4 revision 127808 
1dnl
2dnl $Id: broken-realloc.m4,v 1.1.12.1 2004/04/01 07:27:32 joda Exp $
3dnl
4dnl Test for realloc that doesn't handle NULL as first parameter
5dnl
6AC_DEFUN([rk_BROKEN_REALLOC], [
7AC_CACHE_CHECK(if realloc if broken, ac_cv_func_realloc_broken, [
8ac_cv_func_realloc_broken=no
9AC_TRY_RUN([
10#include <stddef.h>
11#include <stdlib.h>
12
13int main()
14{
15	return realloc(NULL, 17) == NULL;
16}
17],:, ac_cv_func_realloc_broken=yes, :)
18])
19if test "$ac_cv_func_realloc_broken" = yes ; then
20	AC_DEFINE(BROKEN_REALLOC, 1, [Define if realloc(NULL) doesn't work.])
21fi
22AH_BOTTOM([#ifdef BROKEN_REALLOC
23#define realloc(X, Y) isoc_realloc((X), (Y))
24#define isoc_realloc(X, Y) ((X) ? realloc((X), (Y)) : malloc(Y))
25#endif])
26])
27