[Bug c/17665] wrong code with -O2

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-09-25 18:09 -------
 newhead=*(void **) head;
 *(char **) head=NULL;
is undefined because of what I mentioned, nothing more than that.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17665