* Some platforms do not use the POSIX exit code, but at least have the
  decency to give a textual report we can use in the test framework.
* Some totally fail to report this on their own. For those systems a
  work-around was implemented.

* Unless LIBC_FATAL_STDERR_ is set to 1 in the environment, memory
  problems detected by glibc malloc will be dumped on /dev/tty, but
  we'd rather have those in the log files.

* On some machines this test will create core files on every
    make check
  if not disallowed with ulimit -c 0.