--- /dev/null
+/* Test object-spanning accesses. This is most conveniently done with
+ mmap, thus the config.h specificity here. */
+#include "../config.h"
+
+#include <unistd.h>
+#include <string.h>
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+int main ()
+{
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+#ifdef HAVE_MMAP
+ void *p;
+ unsigned pg = getpagesize ();
+ int rc;
+
+ p = mmap (NULL, 4 * pg, PROT_READ|PROT_WRITE,
+ MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+ if (p == NULL)
+ return 1;
+
+ memset (p, 0, 4*pg);
+ rc = munmap (p, pg);
+ if (rc < 0) return 1;
+ memset (p+pg, 0, 3*pg);
+ rc = munmap (p+pg, pg);
+ if (rc < 0) return 1;
+ memset (p+2*pg, 0, 2*pg);
+ rc = munmap (p+2*pg, pg);
+ if (rc < 0) return 1;
+ memset (p+3*pg, 0, pg);
+ rc = munmap (p+3*pg, pg);
+ if (rc < 0) return 1;
+#endif
+
+ return 0;
+}