invalid expression evaluation in gcc

[Nathan Sidwell]

Griff Smith wrote:
> Description:    The values of the two occurrences of (tmpvar->num = tmpnum)
>                 are not computed correctly; I think the compiler loses track

It looks to me like your code is the moral equivalent of
	int tmp;
	if ((tmp = expr1, tmp) > (tmp = expr2, tmp))

which is undefined. There is more than one write to tmp without an
intervening sequence point.  The LHS of the two ',' operators are
not ordered wrt each other.

nathan

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